java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf -i ../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/ArrayInit02.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-e1a14da [2018-12-24 14:16:23,155 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-24 14:16:23,157 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-24 14:16:23,169 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2018-12-24 14:16:23,202 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf [2018-12-24 14:16:23,226 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-24 14:16:23,226 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-24 14:16:23,227 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-24 14:16:23,227 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-24 14:16:23,227 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-24 14:16:23,231 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-24 14:16:23,231 INFO L133 SettingsManager]: * Inline calls to unimplemented procedures=true [2018-12-24 14:16:23,231 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-24 14:16:23,231 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-24 14:16:23,232 INFO L133 SettingsManager]: * Underlying domain=OctagonDomain [2018-12-24 14:16:23,232 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-24 14:16:23,232 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-24 14:16:23,232 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-24 14:16:23,233 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-24 14:16:23,233 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-24 14:16:23,234 INFO L133 SettingsManager]: * Use SBE=true [2018-12-24 14:16:23,234 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-24 14:16:23,234 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-24 14:16:23,234 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-24 14:16:23,234 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-24 14:16:23,235 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-24 14:16:23,235 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-24 14:16:23,235 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-24 14:16:23,235 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-24 14:16:23,235 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-24 14:16:23,235 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-24 14:16:23,236 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-24 14:16:23,236 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-24 14:16:23,236 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-24 14:16:23,236 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-24 14:16:23,236 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-24 14:16:23,237 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-24 14:16:23,237 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-24 14:16:23,237 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-24 14:16:23,237 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-24 14:16:23,237 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-24 14:16:23,238 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-24 14:16:23,238 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-24 14:16:23,238 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-24 14:16:23,276 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-24 14:16:23,287 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-24 14:16:23,290 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-24 14:16:23,291 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-24 14:16:23,292 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-24 14:16:23,293 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/ArrayInit02.bpl [2018-12-24 14:16:23,293 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/ArrayInit02.bpl' [2018-12-24 14:16:23,336 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-24 14:16:23,339 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-24 14:16:23,340 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-24 14:16:23,340 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-24 14:16:23,340 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-24 14:16:23,357 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 02:16:23" (1/1) ... [2018-12-24 14:16:23,369 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 02:16:23" (1/1) ... [2018-12-24 14:16:23,377 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-24 14:16:23,378 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-24 14:16:23,378 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-24 14:16:23,379 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-24 14:16:23,391 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 02:16:23" (1/1) ... [2018-12-24 14:16:23,392 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 02:16:23" (1/1) ... [2018-12-24 14:16:23,392 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 02:16:23" (1/1) ... [2018-12-24 14:16:23,393 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 02:16:23" (1/1) ... [2018-12-24 14:16:23,396 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 02:16:23" (1/1) ... [2018-12-24 14:16:23,403 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 02:16:23" (1/1) ... [2018-12-24 14:16:23,405 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 02:16:23" (1/1) ... [2018-12-24 14:16:23,406 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-24 14:16:23,407 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-24 14:16:23,407 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-24 14:16:23,407 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-24 14:16:23,408 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 02:16:23" (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 14:16:23,486 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2018-12-24 14:16:23,486 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-24 14:16:23,486 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-24 14:16:23,757 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-24 14:16:23,757 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-24 14:16:23,758 INFO L202 PluginConnector]: Adding new model ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.12 02:16:23 BoogieIcfgContainer [2018-12-24 14:16:23,758 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-24 14:16:23,759 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-24 14:16:23,759 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-24 14:16:23,763 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-24 14:16:23,763 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 02:16:23" (1/2) ... [2018-12-24 14:16:23,765 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f2cc890 and model type ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.12 02:16:23, skipping insertion in model container [2018-12-24 14:16:23,765 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.12 02:16:23" (2/2) ... [2018-12-24 14:16:23,767 INFO L112 eAbstractionObserver]: Analyzing ICFG ArrayInit02.bpl [2018-12-24 14:16:23,777 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-24 14:16:23,785 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-24 14:16:23,804 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-24 14:16:23,840 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-24 14:16:23,841 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-24 14:16:23,841 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-24 14:16:23,841 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-24 14:16:23,841 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-24 14:16:23,842 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-24 14:16:23,842 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-24 14:16:23,842 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-24 14:16:23,859 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2018-12-24 14:16:23,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-24 14:16:23,876 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:23,877 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-12-24 14:16:23,883 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:23,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:23,891 INFO L82 PathProgramCache]: Analyzing trace with hash 900035954, now seen corresponding path program 1 times [2018-12-24 14:16:23,894 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:23,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:23,952 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:23,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:23,952 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:23,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:24,148 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 14:16:24,150 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-24 14:16:24,151 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-24 14:16:24,151 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-24 14:16:24,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-24 14:16:24,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-24 14:16:24,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-24 14:16:24,177 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 4 states. [2018-12-24 14:16:24,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:24,358 INFO L93 Difference]: Finished difference Result 26 states and 34 transitions. [2018-12-24 14:16:24,359 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-24 14:16:24,360 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-12-24 14:16:24,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:24,372 INFO L225 Difference]: With dead ends: 26 [2018-12-24 14:16:24,372 INFO L226 Difference]: Without dead ends: 13 [2018-12-24 14:16:24,376 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-12-24 14:16:24,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-24 14:16:24,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2018-12-24 14:16:24,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-12-24 14:16:24,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 14 transitions. [2018-12-24 14:16:24,414 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 14 transitions. Word has length 6 [2018-12-24 14:16:24,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:24,414 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 14 transitions. [2018-12-24 14:16:24,414 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-24 14:16:24,414 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 14 transitions. [2018-12-24 14:16:24,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-24 14:16:24,415 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:24,415 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-24 14:16:24,415 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:24,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:24,416 INFO L82 PathProgramCache]: Analyzing trace with hash 429804648, now seen corresponding path program 1 times [2018-12-24 14:16:24,416 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:24,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:24,417 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:24,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:24,418 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:24,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:24,525 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 14:16:24,525 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-24 14:16:24,526 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-12-24 14:16:24,526 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-24 14:16:24,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-24 14:16:24,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-24 14:16:24,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-24 14:16:24,529 INFO L87 Difference]: Start difference. First operand 11 states and 14 transitions. Second operand 4 states. [2018-12-24 14:16:24,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:24,630 INFO L93 Difference]: Finished difference Result 25 states and 31 transitions. [2018-12-24 14:16:24,631 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-24 14:16:24,631 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2018-12-24 14:16:24,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:24,632 INFO L225 Difference]: With dead ends: 25 [2018-12-24 14:16:24,632 INFO L226 Difference]: Without dead ends: 23 [2018-12-24 14:16:24,634 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-12-24 14:16:24,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-12-24 14:16:24,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 19. [2018-12-24 14:16:24,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-24 14:16:24,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 26 transitions. [2018-12-24 14:16:24,640 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 26 transitions. Word has length 9 [2018-12-24 14:16:24,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:24,640 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 26 transitions. [2018-12-24 14:16:24,640 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-24 14:16:24,641 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 26 transitions. [2018-12-24 14:16:24,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-24 14:16:24,641 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:24,642 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-24 14:16:24,642 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:24,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:24,642 INFO L82 PathProgramCache]: Analyzing trace with hash 429806570, now seen corresponding path program 1 times [2018-12-24 14:16:24,642 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:24,644 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:24,644 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:24,644 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:24,644 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:24,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:24,692 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 14:16:24,693 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-24 14:16:24,693 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-24 14:16:24,693 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-24 14:16:24,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-24 14:16:24,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-24 14:16:24,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-24 14:16:24,695 INFO L87 Difference]: Start difference. First operand 19 states and 26 transitions. Second operand 3 states. [2018-12-24 14:16:24,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:24,756 INFO L93 Difference]: Finished difference Result 24 states and 31 transitions. [2018-12-24 14:16:24,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-24 14:16:24,757 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2018-12-24 14:16:24,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:24,758 INFO L225 Difference]: With dead ends: 24 [2018-12-24 14:16:24,758 INFO L226 Difference]: Without dead ends: 13 [2018-12-24 14:16:24,758 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 14:16:24,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-24 14:16:24,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2018-12-24 14:16:24,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-12-24 14:16:24,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2018-12-24 14:16:24,761 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2018-12-24 14:16:24,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:24,762 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2018-12-24 14:16:24,762 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-24 14:16:24,762 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2018-12-24 14:16:24,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-24 14:16:24,763 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:24,763 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-24 14:16:24,763 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:24,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:24,763 INFO L82 PathProgramCache]: Analyzing trace with hash -2090155286, now seen corresponding path program 1 times [2018-12-24 14:16:24,764 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:24,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:24,765 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:24,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:24,765 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:24,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:25,104 WARN L181 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 15 [2018-12-24 14:16:25,157 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 14:16:25,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:25,158 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:25,159 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 10 with the following transitions: [2018-12-24 14:16:25,161 INFO L207 CegarAbsIntRunner]: [0], [4], [9], [11], [13], [17], [20], [26], [27] [2018-12-24 14:16:25,221 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-24 14:16:25,221 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-24 14:16:25,439 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-24 14:16:25,442 INFO L272 AbstractInterpreter]: Visited 9 different actions 46 times. Merged at 8 different actions 36 times. Widened at 1 different actions 3 times. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-24 14:16:25,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:25,450 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-24 14:16:25,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:25,451 INFO 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 14:16:25,467 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:25,467 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:16:25,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:25,493 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:25,786 WARN L181 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2018-12-24 14:16:25,789 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 14:16:25,789 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:25,834 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 14:16:25,854 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:25,855 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 6 [2018-12-24 14:16:25,855 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:25,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-24 14:16:25,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-24 14:16:25,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-12-24 14:16:25,857 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 7 states. [2018-12-24 14:16:26,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:26,114 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2018-12-24 14:16:26,118 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-24 14:16:26,118 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2018-12-24 14:16:26,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:26,119 INFO L225 Difference]: With dead ends: 26 [2018-12-24 14:16:26,119 INFO L226 Difference]: Without dead ends: 19 [2018-12-24 14:16:26,120 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2018-12-24 14:16:26,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-24 14:16:26,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 14. [2018-12-24 14:16:26,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-12-24 14:16:26,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2018-12-24 14:16:26,125 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 9 [2018-12-24 14:16:26,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:26,125 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2018-12-24 14:16:26,126 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-24 14:16:26,126 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2018-12-24 14:16:26,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-24 14:16:26,127 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:26,127 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-24 14:16:26,127 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:26,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:26,128 INFO L82 PathProgramCache]: Analyzing trace with hash -368470767, now seen corresponding path program 1 times [2018-12-24 14:16:26,128 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:26,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:26,129 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:26,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:26,129 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:26,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:26,275 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 14:16:26,276 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:26,276 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:26,276 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-24 14:16:26,277 INFO L207 CegarAbsIntRunner]: [0], [4], [9], [11], [13], [17], [20], [22], [26], [27], [30], [32] [2018-12-24 14:16:26,279 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-24 14:16:26,279 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-24 14:16:26,436 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-24 14:16:26,436 INFO L272 AbstractInterpreter]: Visited 12 different actions 98 times. Merged at 11 different actions 71 times. Widened at 3 different actions 7 times. Found 17 fixpoints after 6 different actions. Largest state had 0 variables. [2018-12-24 14:16:26,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:26,437 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-24 14:16:26,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:26,438 INFO 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 14:16:26,457 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:26,458 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:16:26,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:26,476 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:26,586 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 14:16:26,586 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:26,624 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 14:16:26,643 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:26,643 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 7 [2018-12-24 14:16:26,643 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:26,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-24 14:16:26,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-24 14:16:26,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-12-24 14:16:26,645 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 8 states. [2018-12-24 14:16:27,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:27,046 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2018-12-24 14:16:27,046 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-24 14:16:27,046 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 13 [2018-12-24 14:16:27,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:27,047 INFO L225 Difference]: With dead ends: 31 [2018-12-24 14:16:27,048 INFO L226 Difference]: Without dead ends: 19 [2018-12-24 14:16:27,049 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 14:16:27,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-24 14:16:27,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2018-12-24 14:16:27,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-12-24 14:16:27,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2018-12-24 14:16:27,053 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2018-12-24 14:16:27,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:27,053 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2018-12-24 14:16:27,054 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-24 14:16:27,054 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2018-12-24 14:16:27,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-24 14:16:27,054 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:27,054 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-24 14:16:27,055 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:27,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:27,055 INFO L82 PathProgramCache]: Analyzing trace with hash -256855911, now seen corresponding path program 2 times [2018-12-24 14:16:27,055 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:27,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:27,057 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:27,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:27,057 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:27,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:27,340 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 14:16:27,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:27,341 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:27,342 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:16:27,342 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:16:27,342 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:27,342 INFO 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 14:16:27,361 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:16:27,362 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:16:27,372 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-24 14:16:27,372 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:16:27,376 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:27,533 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 14:16:27,533 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:27,568 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 14:16:27,588 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:27,588 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 10 [2018-12-24 14:16:27,588 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:27,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-24 14:16:27,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-24 14:16:27,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2018-12-24 14:16:27,590 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 11 states. [2018-12-24 14:16:27,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:27,882 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2018-12-24 14:16:27,882 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-24 14:16:27,883 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-24 14:16:27,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:27,884 INFO L225 Difference]: With dead ends: 35 [2018-12-24 14:16:27,884 INFO L226 Difference]: Without dead ends: 28 [2018-12-24 14:16:27,885 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 14:16:27,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-24 14:16:27,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 21. [2018-12-24 14:16:27,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-24 14:16:27,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2018-12-24 14:16:27,890 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 16 [2018-12-24 14:16:27,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:27,890 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2018-12-24 14:16:27,890 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-24 14:16:27,891 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2018-12-24 14:16:27,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-24 14:16:27,891 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:27,891 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2018-12-24 14:16:27,892 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:27,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:27,892 INFO L82 PathProgramCache]: Analyzing trace with hash 1110643520, now seen corresponding path program 3 times [2018-12-24 14:16:27,892 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:27,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:27,894 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:16:27,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:27,894 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:27,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:28,008 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 14:16:28,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:28,009 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:28,009 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:16:28,009 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:16:28,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:28,009 INFO 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 14:16:28,018 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:16:28,018 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:16:28,030 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:16:28,030 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:16:28,032 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:28,093 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 14:16:28,094 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:28,218 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 14:16:28,238 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:28,238 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 10 [2018-12-24 14:16:28,239 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:28,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-24 14:16:28,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-24 14:16:28,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2018-12-24 14:16:28,240 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 11 states. [2018-12-24 14:16:28,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:28,377 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2018-12-24 14:16:28,377 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-24 14:16:28,377 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-12-24 14:16:28,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:28,378 INFO L225 Difference]: With dead ends: 45 [2018-12-24 14:16:28,378 INFO L226 Difference]: Without dead ends: 26 [2018-12-24 14:16:28,379 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 14:16:28,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-12-24 14:16:28,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2018-12-24 14:16:28,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-24 14:16:28,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2018-12-24 14:16:28,384 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 20 [2018-12-24 14:16:28,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:28,384 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2018-12-24 14:16:28,384 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-24 14:16:28,384 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2018-12-24 14:16:28,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-24 14:16:28,385 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:28,385 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1] [2018-12-24 14:16:28,386 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:28,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:28,386 INFO L82 PathProgramCache]: Analyzing trace with hash -1324912968, now seen corresponding path program 4 times [2018-12-24 14:16:28,386 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:28,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:28,387 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:16:28,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:28,387 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:28,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:28,805 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 14:16:28,805 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:28,806 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:28,806 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:16:28,806 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:16:28,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:28,806 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:16:28,816 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:28,816 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:16:28,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:28,826 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:28,932 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 14:16:28,932 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:28,968 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 14:16:28,987 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:28,987 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 13 [2018-12-24 14:16:28,988 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:28,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-24 14:16:28,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-24 14:16:28,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2018-12-24 14:16:28,989 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 14 states. [2018-12-24 14:16:29,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:29,366 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2018-12-24 14:16:29,371 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-24 14:16:29,371 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 23 [2018-12-24 14:16:29,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:29,372 INFO L225 Difference]: With dead ends: 49 [2018-12-24 14:16:29,372 INFO L226 Difference]: Without dead ends: 39 [2018-12-24 14:16:29,373 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 14:16:29,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-24 14:16:29,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 28. [2018-12-24 14:16:29,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-24 14:16:29,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2018-12-24 14:16:29,378 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2018-12-24 14:16:29,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:29,378 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2018-12-24 14:16:29,379 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-24 14:16:29,379 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2018-12-24 14:16:29,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-24 14:16:29,380 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:29,380 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2018-12-24 14:16:29,380 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:29,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:29,380 INFO L82 PathProgramCache]: Analyzing trace with hash 1588570591, now seen corresponding path program 5 times [2018-12-24 14:16:29,381 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:29,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:29,382 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:29,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:29,382 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:29,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:29,489 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 14:16:29,490 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:29,490 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:29,490 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:16:29,491 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:16:29,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:29,491 INFO 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 14:16:29,500 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:16:29,500 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:16:29,510 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-24 14:16:29,511 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:16:29,514 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:29,598 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 14:16:29,598 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:29,640 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 14:16:29,667 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:29,667 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 13 [2018-12-24 14:16:29,667 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:29,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-24 14:16:29,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-24 14:16:29,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2018-12-24 14:16:29,669 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 14 states. [2018-12-24 14:16:30,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:30,043 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2018-12-24 14:16:30,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-24 14:16:30,043 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 27 [2018-12-24 14:16:30,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:30,044 INFO L225 Difference]: With dead ends: 60 [2018-12-24 14:16:30,044 INFO L226 Difference]: Without dead ends: 33 [2018-12-24 14:16:30,045 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 14:16:30,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-24 14:16:30,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2018-12-24 14:16:30,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-24 14:16:30,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2018-12-24 14:16:30,050 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 27 [2018-12-24 14:16:30,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:30,050 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2018-12-24 14:16:30,051 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-24 14:16:30,051 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2018-12-24 14:16:30,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-24 14:16:30,051 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:30,051 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1] [2018-12-24 14:16:30,052 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:30,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:30,052 INFO L82 PathProgramCache]: Analyzing trace with hash 366737255, now seen corresponding path program 6 times [2018-12-24 14:16:30,052 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:30,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:30,053 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:16:30,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:30,053 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:30,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:30,282 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 14:16:30,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:30,282 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:30,283 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:16:30,283 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:16:30,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:30,283 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:16:30,292 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:16:30,292 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:16:30,312 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:16:30,313 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:16:30,315 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:30,457 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 14:16:30,458 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:30,502 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 14:16:30,522 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:30,522 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 16 [2018-12-24 14:16:30,523 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:30,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-24 14:16:30,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-24 14:16:30,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2018-12-24 14:16:30,524 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 17 states. [2018-12-24 14:16:31,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:31,352 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2018-12-24 14:16:31,362 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-24 14:16:31,362 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 30 [2018-12-24 14:16:31,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:31,363 INFO L225 Difference]: With dead ends: 64 [2018-12-24 14:16:31,363 INFO L226 Difference]: Without dead ends: 50 [2018-12-24 14:16:31,364 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=95, Invalid=505, Unknown=0, NotChecked=0, Total=600 [2018-12-24 14:16:31,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-12-24 14:16:31,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 35. [2018-12-24 14:16:31,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-12-24 14:16:31,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-12-24 14:16:31,378 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 30 [2018-12-24 14:16:31,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:31,378 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-12-24 14:16:31,378 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-24 14:16:31,378 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-12-24 14:16:31,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-12-24 14:16:31,380 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:31,380 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2018-12-24 14:16:31,380 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:31,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:31,381 INFO L82 PathProgramCache]: Analyzing trace with hash -1079885042, now seen corresponding path program 7 times [2018-12-24 14:16:31,381 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:31,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:31,383 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:16:31,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:31,383 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:31,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:31,901 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 14:16:31,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:31,902 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:31,902 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:16:31,902 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:16:31,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:31,902 INFO 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 14:16:31,911 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:31,911 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:16:31,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:31,922 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:32,042 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 14:16:32,042 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:32,154 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 14:16:32,174 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:32,174 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 16 [2018-12-24 14:16:32,174 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:32,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-24 14:16:32,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-24 14:16:32,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2018-12-24 14:16:32,176 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 17 states. [2018-12-24 14:16:32,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:32,537 INFO L93 Difference]: Finished difference Result 75 states and 79 transitions. [2018-12-24 14:16:32,538 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-24 14:16:32,538 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 34 [2018-12-24 14:16:32,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:32,539 INFO L225 Difference]: With dead ends: 75 [2018-12-24 14:16:32,539 INFO L226 Difference]: Without dead ends: 40 [2018-12-24 14:16:32,540 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 53 SyntacticMatches, 9 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2018-12-24 14:16:32,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-24 14:16:32,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2018-12-24 14:16:32,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-12-24 14:16:32,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-12-24 14:16:32,548 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 34 [2018-12-24 14:16:32,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:32,548 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-12-24 14:16:32,548 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-24 14:16:32,548 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-12-24 14:16:32,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-12-24 14:16:32,549 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:32,549 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1] [2018-12-24 14:16:32,550 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:32,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:32,550 INFO L82 PathProgramCache]: Analyzing trace with hash -921359226, now seen corresponding path program 8 times [2018-12-24 14:16:32,550 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:32,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:32,551 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:32,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:32,552 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:32,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:32,912 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 14:16:32,912 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:32,912 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:32,913 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:16:32,913 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:16:32,913 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:32,913 INFO 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 14:16:32,922 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:16:32,922 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:16:32,936 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-24 14:16:32,936 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:16:32,939 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:33,377 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 14:16:33,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:34,219 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 14:16:34,238 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:34,238 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 14] total 33 [2018-12-24 14:16:34,238 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:34,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-24 14:16:34,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-24 14:16:34,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=961, Unknown=0, NotChecked=0, Total=1122 [2018-12-24 14:16:34,240 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 27 states. [2018-12-24 14:16:36,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:36,805 INFO L93 Difference]: Finished difference Result 97 states and 103 transitions. [2018-12-24 14:16:36,805 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-24 14:16:36,806 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 37 [2018-12-24 14:16:36,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:36,807 INFO L225 Difference]: With dead ends: 97 [2018-12-24 14:16:36,807 INFO L226 Difference]: Without dead ends: 58 [2018-12-24 14:16:36,811 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 47 SyntacticMatches, 6 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 855 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=499, Invalid=3533, Unknown=0, NotChecked=0, Total=4032 [2018-12-24 14:16:36,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-24 14:16:36,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 45. [2018-12-24 14:16:36,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-24 14:16:36,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2018-12-24 14:16:36,818 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 37 [2018-12-24 14:16:36,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:36,819 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2018-12-24 14:16:36,819 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-24 14:16:36,819 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2018-12-24 14:16:36,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-24 14:16:36,820 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:36,820 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1] [2018-12-24 14:16:36,820 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:36,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:36,821 INFO L82 PathProgramCache]: Analyzing trace with hash -1868574667, now seen corresponding path program 9 times [2018-12-24 14:16:36,821 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:36,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:36,822 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:16:36,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:36,822 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:36,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:37,271 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 14:16:37,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:37,271 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:37,271 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:16:37,271 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:16:37,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:37,271 INFO 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 14:16:37,280 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:16:37,280 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:16:37,289 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:16:37,289 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:16:37,291 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:37,580 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 14:16:37,581 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:37,617 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 14:16:37,637 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:37,637 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 22 [2018-12-24 14:16:37,637 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:37,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-24 14:16:37,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-24 14:16:37,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=448, Unknown=0, NotChecked=0, Total=506 [2018-12-24 14:16:37,638 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 23 states. [2018-12-24 14:16:39,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:39,356 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2018-12-24 14:16:39,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-24 14:16:39,357 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 44 [2018-12-24 14:16:39,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:39,358 INFO L225 Difference]: With dead ends: 94 [2018-12-24 14:16:39,358 INFO L226 Difference]: Without dead ends: 72 [2018-12-24 14:16:39,360 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 14:16:39,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-12-24 14:16:39,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 49. [2018-12-24 14:16:39,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-24 14:16:39,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2018-12-24 14:16:39,369 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 44 [2018-12-24 14:16:39,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:39,369 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2018-12-24 14:16:39,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-24 14:16:39,369 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2018-12-24 14:16:39,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-24 14:16:39,370 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:39,370 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1] [2018-12-24 14:16:39,371 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:39,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:39,371 INFO L82 PathProgramCache]: Analyzing trace with hash 269550812, now seen corresponding path program 10 times [2018-12-24 14:16:39,371 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:39,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:39,372 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:16:39,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:39,372 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:39,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:39,528 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 14:16:39,529 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:39,529 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:39,529 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:16:39,529 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:16:39,529 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:39,530 INFO 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 14:16:39,538 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:39,538 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:16:39,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:39,552 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:39,763 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 14:16:39,763 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:39,845 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 14:16:39,867 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:39,867 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 22 [2018-12-24 14:16:39,868 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:39,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-24 14:16:39,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-24 14:16:39,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-12-24 14:16:39,869 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 23 states. [2018-12-24 14:16:40,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:40,157 INFO L93 Difference]: Finished difference Result 105 states and 109 transitions. [2018-12-24 14:16:40,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-24 14:16:40,158 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 48 [2018-12-24 14:16:40,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:40,159 INFO L225 Difference]: With dead ends: 105 [2018-12-24 14:16:40,159 INFO L226 Difference]: Without dead ends: 54 [2018-12-24 14:16:40,161 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 75 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=232, Invalid=638, Unknown=0, NotChecked=0, Total=870 [2018-12-24 14:16:40,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-12-24 14:16:40,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2018-12-24 14:16:40,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-12-24 14:16:40,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2018-12-24 14:16:40,170 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 48 [2018-12-24 14:16:40,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:40,171 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2018-12-24 14:16:40,171 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-24 14:16:40,171 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2018-12-24 14:16:40,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-12-24 14:16:40,172 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:40,172 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1] [2018-12-24 14:16:40,172 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:40,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:40,173 INFO L82 PathProgramCache]: Analyzing trace with hash 2089942100, now seen corresponding path program 11 times [2018-12-24 14:16:40,173 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:40,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:40,174 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:40,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:40,174 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:40,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:40,569 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 14:16:40,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:40,570 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:40,570 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:16:40,570 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:16:40,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:40,570 INFO 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 14:16:40,581 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:16:40,581 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:16:40,596 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-12-24 14:16:40,596 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:16:40,599 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:40,810 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 14:16:40,810 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:40,889 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 14:16:40,908 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:40,909 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 25 [2018-12-24 14:16:40,909 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:40,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-24 14:16:40,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-24 14:16:40,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=584, Unknown=0, NotChecked=0, Total=650 [2018-12-24 14:16:40,910 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 26 states. [2018-12-24 14:16:42,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:42,514 INFO L93 Difference]: Finished difference Result 109 states and 114 transitions. [2018-12-24 14:16:42,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-24 14:16:42,515 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 51 [2018-12-24 14:16:42,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:42,516 INFO L225 Difference]: With dead ends: 109 [2018-12-24 14:16:42,516 INFO L226 Difference]: Without dead ends: 83 [2018-12-24 14:16:42,517 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=179, Invalid=1381, Unknown=0, NotChecked=0, Total=1560 [2018-12-24 14:16:42,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-12-24 14:16:42,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 56. [2018-12-24 14:16:42,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-12-24 14:16:42,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2018-12-24 14:16:42,531 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 51 [2018-12-24 14:16:42,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:42,532 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2018-12-24 14:16:42,532 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-24 14:16:42,532 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2018-12-24 14:16:42,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-12-24 14:16:42,533 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:42,533 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1] [2018-12-24 14:16:42,533 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:42,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:42,534 INFO L82 PathProgramCache]: Analyzing trace with hash 549587323, now seen corresponding path program 12 times [2018-12-24 14:16:42,534 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:42,534 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:42,535 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:16:42,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:42,536 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:42,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:42,827 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 14:16:42,828 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:42,828 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:42,828 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:16:42,828 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:16:42,828 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:42,828 INFO 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 14:16:42,837 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:16:42,837 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:16:42,847 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:16:42,847 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:16:42,849 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:42,990 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 14:16:42,991 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:43,090 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 14:16:43,108 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:43,109 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 25 [2018-12-24 14:16:43,109 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:43,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-24 14:16:43,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-24 14:16:43,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2018-12-24 14:16:43,110 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 26 states. [2018-12-24 14:16:43,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:43,440 INFO L93 Difference]: Finished difference Result 120 states and 124 transitions. [2018-12-24 14:16:43,440 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-24 14:16:43,440 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 55 [2018-12-24 14:16:43,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:43,441 INFO L225 Difference]: With dead ends: 120 [2018-12-24 14:16:43,441 INFO L226 Difference]: Without dead ends: 61 [2018-12-24 14:16:43,443 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 86 SyntacticMatches, 15 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=293, Invalid=829, Unknown=0, NotChecked=0, Total=1122 [2018-12-24 14:16:43,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-24 14:16:43,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2018-12-24 14:16:43,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-12-24 14:16:43,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2018-12-24 14:16:43,452 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 55 [2018-12-24 14:16:43,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:43,452 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2018-12-24 14:16:43,452 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-24 14:16:43,453 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2018-12-24 14:16:43,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-12-24 14:16:43,453 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:43,454 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1] [2018-12-24 14:16:43,454 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:43,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:43,454 INFO L82 PathProgramCache]: Analyzing trace with hash -1743111421, now seen corresponding path program 13 times [2018-12-24 14:16:43,454 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:43,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:43,455 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:16:43,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:43,456 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:43,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:43,816 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 14:16:43,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:43,816 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:43,816 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:16:43,816 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:16:43,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:43,816 INFO 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 14:16:43,826 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:43,826 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:16:43,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:43,839 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:44,107 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 14:16:44,107 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:44,190 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 14:16:44,210 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:44,210 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 28 [2018-12-24 14:16:44,210 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:44,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-24 14:16:44,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-24 14:16:44,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=738, Unknown=0, NotChecked=0, Total=812 [2018-12-24 14:16:44,211 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 29 states. [2018-12-24 14:16:45,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:45,810 INFO L93 Difference]: Finished difference Result 124 states and 129 transitions. [2018-12-24 14:16:45,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-24 14:16:45,818 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 58 [2018-12-24 14:16:45,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:45,819 INFO L225 Difference]: With dead ends: 124 [2018-12-24 14:16:45,819 INFO L226 Difference]: Without dead ends: 94 [2018-12-24 14:16:45,820 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 103 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=211, Invalid=1769, Unknown=0, NotChecked=0, Total=1980 [2018-12-24 14:16:45,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-12-24 14:16:45,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 63. [2018-12-24 14:16:45,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-24 14:16:45,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2018-12-24 14:16:45,836 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 58 [2018-12-24 14:16:45,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:45,838 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2018-12-24 14:16:45,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-24 14:16:45,838 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2018-12-24 14:16:45,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-24 14:16:45,839 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:45,839 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1] [2018-12-24 14:16:45,839 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:45,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:45,840 INFO L82 PathProgramCache]: Analyzing trace with hash -1415751510, now seen corresponding path program 14 times [2018-12-24 14:16:45,840 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:45,842 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:45,842 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:45,842 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:45,843 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:45,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:46,323 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 14:16:46,324 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:46,324 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:46,324 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:16:46,324 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:16:46,324 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:46,324 INFO 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 14:16:46,332 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:16:46,333 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:16:46,350 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-24 14:16:46,350 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:16:46,352 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:46,707 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 14:16:46,707 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:46,874 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 14:16:46,893 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:46,893 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 28 [2018-12-24 14:16:46,893 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:46,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-24 14:16:46,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-24 14:16:46,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2018-12-24 14:16:46,894 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand 29 states. [2018-12-24 14:16:47,436 WARN L181 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-12-24 14:16:47,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:47,489 INFO L93 Difference]: Finished difference Result 135 states and 139 transitions. [2018-12-24 14:16:47,490 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-24 14:16:47,490 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2018-12-24 14:16:47,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:47,491 INFO L225 Difference]: With dead ends: 135 [2018-12-24 14:16:47,491 INFO L226 Difference]: Without dead ends: 68 [2018-12-24 14:16:47,492 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 97 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=361, Invalid=1045, Unknown=0, NotChecked=0, Total=1406 [2018-12-24 14:16:47,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-12-24 14:16:47,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2018-12-24 14:16:47,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-12-24 14:16:47,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2018-12-24 14:16:47,502 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 62 [2018-12-24 14:16:47,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:47,502 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2018-12-24 14:16:47,502 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-24 14:16:47,503 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2018-12-24 14:16:47,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-12-24 14:16:47,503 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:47,504 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1] [2018-12-24 14:16:47,504 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:47,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:47,504 INFO L82 PathProgramCache]: Analyzing trace with hash 175889954, now seen corresponding path program 15 times [2018-12-24 14:16:47,504 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:47,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:47,505 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:16:47,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:47,506 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:47,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:48,213 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 14:16:48,214 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:48,214 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:48,214 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:16:48,214 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:16:48,214 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:48,214 INFO 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 14:16:48,223 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:16:48,223 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:16:48,248 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:16:48,248 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:16:48,251 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:48,621 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 14:16:48,621 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:48,681 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 14:16:48,704 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:48,705 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 31 [2018-12-24 14:16:48,705 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:48,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-24 14:16:48,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-24 14:16:48,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=910, Unknown=0, NotChecked=0, Total=992 [2018-12-24 14:16:48,706 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 32 states. [2018-12-24 14:16:50,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:50,629 INFO L93 Difference]: Finished difference Result 139 states and 144 transitions. [2018-12-24 14:16:50,629 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-24 14:16:50,629 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 65 [2018-12-24 14:16:50,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:50,631 INFO L225 Difference]: With dead ends: 139 [2018-12-24 14:16:50,631 INFO L226 Difference]: Without dead ends: 105 [2018-12-24 14:16:50,632 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 116 SyntacticMatches, 3 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=245, Invalid=2205, Unknown=0, NotChecked=0, Total=2450 [2018-12-24 14:16:50,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-12-24 14:16:50,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 70. [2018-12-24 14:16:50,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-12-24 14:16:50,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2018-12-24 14:16:50,642 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 65 [2018-12-24 14:16:50,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:50,642 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2018-12-24 14:16:50,643 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-24 14:16:50,643 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2018-12-24 14:16:50,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-12-24 14:16:50,643 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:50,643 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1] [2018-12-24 14:16:50,644 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:50,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:50,644 INFO L82 PathProgramCache]: Analyzing trace with hash 2774089, now seen corresponding path program 16 times [2018-12-24 14:16:50,644 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:50,645 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:50,645 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:16:50,645 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:50,645 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:50,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:50,896 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 14:16:50,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:50,896 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:50,897 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:16:50,897 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:16:50,897 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:50,897 INFO 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 14:16:50,914 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:50,915 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:16:50,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:50,943 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:51,655 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 14:16:51,655 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:51,804 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 14:16:51,822 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:51,823 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 31 [2018-12-24 14:16:51,823 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:51,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-24 14:16:51,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-24 14:16:51,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2018-12-24 14:16:51,824 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 32 states. [2018-12-24 14:16:52,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:52,212 INFO L93 Difference]: Finished difference Result 150 states and 154 transitions. [2018-12-24 14:16:52,213 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-24 14:16:52,213 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 69 [2018-12-24 14:16:52,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:52,214 INFO L225 Difference]: With dead ends: 150 [2018-12-24 14:16:52,214 INFO L226 Difference]: Without dead ends: 75 [2018-12-24 14:16:52,216 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 108 SyntacticMatches, 19 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=436, Invalid=1286, Unknown=0, NotChecked=0, Total=1722 [2018-12-24 14:16:52,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-12-24 14:16:52,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2018-12-24 14:16:52,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-24 14:16:52,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2018-12-24 14:16:52,225 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 69 [2018-12-24 14:16:52,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:52,225 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2018-12-24 14:16:52,225 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-24 14:16:52,226 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2018-12-24 14:16:52,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-24 14:16:52,226 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:52,226 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 1, 1, 1, 1, 1] [2018-12-24 14:16:52,227 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:52,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:52,227 INFO L82 PathProgramCache]: Analyzing trace with hash 2036938705, now seen corresponding path program 17 times [2018-12-24 14:16:52,227 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:52,228 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:52,228 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:16:52,228 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:52,228 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:52,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:16:52,753 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 14:16:52,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:52,753 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:16:52,753 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:16:52,753 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:16:52,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:16:52,754 INFO 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 14:16:52,764 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:16:52,764 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:16:52,783 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-12-24 14:16:52,783 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:16:52,785 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:16:53,686 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 14:16:53,686 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:16:54,463 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 14:16:54,481 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:16:54,482 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24, 24] total 58 [2018-12-24 14:16:54,482 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:16:54,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-24 14:16:54,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-24 14:16:54,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=421, Invalid=3001, Unknown=0, NotChecked=0, Total=3422 [2018-12-24 14:16:54,490 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand 47 states. [2018-12-24 14:16:57,183 WARN L181 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2018-12-24 14:16:59,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:16:59,154 INFO L93 Difference]: Finished difference Result 192 states and 198 transitions. [2018-12-24 14:16:59,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-24 14:16:59,155 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 72 [2018-12-24 14:16:59,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:16:59,156 INFO L225 Difference]: With dead ends: 192 [2018-12-24 14:16:59,156 INFO L226 Difference]: Without dead ends: 113 [2018-12-24 14:16:59,161 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 14:16:59,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2018-12-24 14:16:59,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 80. [2018-12-24 14:16:59,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-12-24 14:16:59,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2018-12-24 14:16:59,172 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 72 [2018-12-24 14:16:59,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:16:59,173 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2018-12-24 14:16:59,173 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-24 14:16:59,173 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2018-12-24 14:16:59,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-12-24 14:16:59,173 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:16:59,173 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1] [2018-12-24 14:16:59,174 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:16:59,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:16:59,174 INFO L82 PathProgramCache]: Analyzing trace with hash 1070649840, now seen corresponding path program 18 times [2018-12-24 14:16:59,174 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:16:59,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:59,175 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:16:59,175 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:16:59,175 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:16:59,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:17:00,241 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 14:17:00,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:00,241 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:17:00,241 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:17:00,242 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:17:00,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:00,242 INFO 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 14:17:00,251 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:17:00,251 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:17:00,266 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:17:00,267 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:17:00,269 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:17:00,868 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 14:17:00,868 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:17:00,938 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 14:17:00,957 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:17:00,958 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 37 [2018-12-24 14:17:00,958 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:17:00,958 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-24 14:17:00,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-24 14:17:00,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1308, Unknown=0, NotChecked=0, Total=1406 [2018-12-24 14:17:00,959 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 38 states. [2018-12-24 14:17:03,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:17:03,388 INFO L93 Difference]: Finished difference Result 169 states and 174 transitions. [2018-12-24 14:17:03,389 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-24 14:17:03,390 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 79 [2018-12-24 14:17:03,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:17:03,390 INFO L225 Difference]: With dead ends: 169 [2018-12-24 14:17:03,391 INFO L226 Difference]: Without dead ends: 127 [2018-12-24 14:17:03,392 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 142 SyntacticMatches, 3 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=319, Invalid=3221, Unknown=0, NotChecked=0, Total=3540 [2018-12-24 14:17:03,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-12-24 14:17:03,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 84. [2018-12-24 14:17:03,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-12-24 14:17:03,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2018-12-24 14:17:03,403 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 79 [2018-12-24 14:17:03,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:17:03,403 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2018-12-24 14:17:03,403 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-24 14:17:03,403 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2018-12-24 14:17:03,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-12-24 14:17:03,404 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:17:03,404 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1] [2018-12-24 14:17:03,404 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:17:03,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:17:03,405 INFO L82 PathProgramCache]: Analyzing trace with hash -685461225, now seen corresponding path program 19 times [2018-12-24 14:17:03,405 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:17:03,405 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:03,406 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:17:03,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:03,406 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:17:03,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:17:03,721 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 14:17:03,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:03,722 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:17:03,722 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:17:03,722 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:17:03,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:03,722 INFO 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 14:17:03,731 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:17:03,731 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:17:03,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:17:03,747 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:17:04,031 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 14:17:04,031 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:17:04,229 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 14:17:04,248 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:17:04,248 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 37 [2018-12-24 14:17:04,248 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:17:04,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-24 14:17:04,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-24 14:17:04,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2018-12-24 14:17:04,249 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2018-12-24 14:17:04,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:17:04,789 INFO L93 Difference]: Finished difference Result 180 states and 184 transitions. [2018-12-24 14:17:04,789 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-24 14:17:04,789 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2018-12-24 14:17:04,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:17:04,791 INFO L225 Difference]: With dead ends: 180 [2018-12-24 14:17:04,791 INFO L226 Difference]: Without dead ends: 89 [2018-12-24 14:17:04,793 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 14:17:04,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-12-24 14:17:04,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2018-12-24 14:17:04,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-24 14:17:04,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2018-12-24 14:17:04,806 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2018-12-24 14:17:04,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:17:04,806 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2018-12-24 14:17:04,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-24 14:17:04,806 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2018-12-24 14:17:04,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-24 14:17:04,807 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:17:04,807 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 1, 1, 1, 1, 1] [2018-12-24 14:17:04,808 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:17:04,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:17:04,808 INFO L82 PathProgramCache]: Analyzing trace with hash -1750415713, now seen corresponding path program 20 times [2018-12-24 14:17:04,808 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:17:04,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:04,809 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:17:04,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:04,809 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:17:04,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:17:05,332 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 14:17:05,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:05,332 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:17:05,332 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:17:05,333 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:17:05,333 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:05,333 INFO 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 14:17:05,341 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:17:05,341 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:17:05,363 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-12-24 14:17:05,364 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:17:05,366 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:17:06,600 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 14:17:06,600 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:17:07,738 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 14:17:07,764 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:17:07,765 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 28, 28] total 68 [2018-12-24 14:17:07,765 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:17:07,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-24 14:17:07,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-24 14:17:07,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=560, Invalid=4132, Unknown=0, NotChecked=0, Total=4692 [2018-12-24 14:17:07,767 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand 55 states. [2018-12-24 14:17:14,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:17:14,204 INFO L93 Difference]: Finished difference Result 230 states and 236 transitions. [2018-12-24 14:17:14,204 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-12-24 14:17:14,204 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 86 [2018-12-24 14:17:14,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:17:14,206 INFO L225 Difference]: With dead ends: 230 [2018-12-24 14:17:14,207 INFO L226 Difference]: Without dead ends: 135 [2018-12-24 14:17:14,213 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 117 SyntacticMatches, 13 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4250 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=1745, Invalid=17995, Unknown=0, NotChecked=0, Total=19740 [2018-12-24 14:17:14,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-12-24 14:17:14,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 94. [2018-12-24 14:17:14,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-12-24 14:17:14,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2018-12-24 14:17:14,229 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 86 [2018-12-24 14:17:14,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:17:14,229 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2018-12-24 14:17:14,229 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-24 14:17:14,229 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2018-12-24 14:17:14,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-12-24 14:17:14,230 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:17:14,230 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1] [2018-12-24 14:17:14,230 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:17:14,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:17:14,230 INFO L82 PathProgramCache]: Analyzing trace with hash 2005850046, now seen corresponding path program 21 times [2018-12-24 14:17:14,230 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:17:14,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:14,231 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:17:14,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:14,232 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:17:14,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:17:14,858 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 14:17:14,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:14,859 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:17:14,859 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:17:14,859 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:17:14,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:14,859 INFO 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 14:17:14,868 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:17:14,868 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:17:14,883 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:17:14,884 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:17:14,886 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:17:15,383 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 14:17:15,383 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:17:15,501 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 14:17:15,520 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:17:15,520 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 43 [2018-12-24 14:17:15,520 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:17:15,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-24 14:17:15,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-24 14:17:15,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1778, Unknown=0, NotChecked=0, Total=1892 [2018-12-24 14:17:15,522 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand 44 states. [2018-12-24 14:17:18,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:17:18,913 INFO L93 Difference]: Finished difference Result 199 states and 204 transitions. [2018-12-24 14:17:18,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-24 14:17:18,913 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 93 [2018-12-24 14:17:18,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:17:18,914 INFO L225 Difference]: With dead ends: 199 [2018-12-24 14:17:18,914 INFO L226 Difference]: Without dead ends: 149 [2018-12-24 14:17:18,915 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 168 SyntacticMatches, 3 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 764 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=401, Invalid=4429, Unknown=0, NotChecked=0, Total=4830 [2018-12-24 14:17:18,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-12-24 14:17:18,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 98. [2018-12-24 14:17:18,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-12-24 14:17:18,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 100 transitions. [2018-12-24 14:17:18,930 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 100 transitions. Word has length 93 [2018-12-24 14:17:18,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:17:18,930 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 100 transitions. [2018-12-24 14:17:18,930 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-24 14:17:18,930 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 100 transitions. [2018-12-24 14:17:18,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-12-24 14:17:18,931 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:17:18,931 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1] [2018-12-24 14:17:18,931 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:17:18,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:17:18,932 INFO L82 PathProgramCache]: Analyzing trace with hash 1370431461, now seen corresponding path program 22 times [2018-12-24 14:17:18,932 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:17:18,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:18,932 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:17:18,933 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:18,933 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:17:18,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:17:19,279 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 14:17:19,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:19,279 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:17:19,279 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:17:19,279 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:17:19,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:19,279 INFO 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 14:17:19,289 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:17:19,289 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:17:19,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:17:19,307 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:17:19,684 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 14:17:19,684 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:17:20,541 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 14:17:20,560 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:17:20,561 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 43 [2018-12-24 14:17:20,561 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:17:20,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-24 14:17:20,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-24 14:17:20,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2018-12-24 14:17:20,562 INFO L87 Difference]: Start difference. First operand 98 states and 100 transitions. Second operand 44 states. [2018-12-24 14:17:21,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:17:21,241 INFO L93 Difference]: Finished difference Result 210 states and 214 transitions. [2018-12-24 14:17:21,241 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-12-24 14:17:21,242 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 97 [2018-12-24 14:17:21,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:17:21,243 INFO L225 Difference]: With dead ends: 210 [2018-12-24 14:17:21,243 INFO L226 Difference]: Without dead ends: 103 [2018-12-24 14:17:21,244 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 152 SyntacticMatches, 27 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1066 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=806, Invalid=2500, Unknown=0, NotChecked=0, Total=3306 [2018-12-24 14:17:21,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-12-24 14:17:21,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 101. [2018-12-24 14:17:21,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-12-24 14:17:21,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2018-12-24 14:17:21,260 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2018-12-24 14:17:21,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:17:21,260 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2018-12-24 14:17:21,260 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-24 14:17:21,261 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2018-12-24 14:17:21,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-12-24 14:17:21,261 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:17:21,261 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 1, 1, 1, 1, 1] [2018-12-24 14:17:21,261 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:17:21,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:17:21,261 INFO L82 PathProgramCache]: Analyzing trace with hash 1811736429, now seen corresponding path program 23 times [2018-12-24 14:17:21,262 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:17:21,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:21,262 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:17:21,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:21,263 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:17:21,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:17:22,416 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 14:17:22,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:22,417 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:17:22,417 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:17:22,417 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:17:22,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:22,417 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:17:22,425 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:17:22,426 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:17:22,452 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-24 14:17:22,452 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:17:22,455 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:17:23,194 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 14:17:23,194 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:17:23,276 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 14:17:23,307 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:17:23,307 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 46 [2018-12-24 14:17:23,307 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:17:23,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-24 14:17:23,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-24 14:17:23,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=2040, Unknown=0, NotChecked=0, Total=2162 [2018-12-24 14:17:23,309 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand 47 states. [2018-12-24 14:17:26,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:17:26,832 INFO L93 Difference]: Finished difference Result 214 states and 219 transitions. [2018-12-24 14:17:26,832 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-24 14:17:26,833 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 100 [2018-12-24 14:17:26,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:17:26,834 INFO L225 Difference]: With dead ends: 214 [2018-12-24 14:17:26,834 INFO L226 Difference]: Without dead ends: 160 [2018-12-24 14:17:26,836 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 14:17:26,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-12-24 14:17:26,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 105. [2018-12-24 14:17:26,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-12-24 14:17:26,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2018-12-24 14:17:26,854 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 100 [2018-12-24 14:17:26,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:17:26,855 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2018-12-24 14:17:26,855 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-24 14:17:26,855 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2018-12-24 14:17:26,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-12-24 14:17:26,855 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:17:26,855 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1] [2018-12-24 14:17:26,856 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:17:26,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:17:26,856 INFO L82 PathProgramCache]: Analyzing trace with hash 1008713748, now seen corresponding path program 24 times [2018-12-24 14:17:26,856 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:17:26,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:26,858 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:17:26,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:26,858 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:17:26,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:17:27,426 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 14:17:27,426 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:27,427 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:17:27,427 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:17:27,427 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:17:27,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:27,427 INFO 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 14:17:27,436 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:17:27,436 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:17:27,453 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:17:27,453 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:17:27,456 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:17:27,861 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 14:17:27,861 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:17:28,201 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 14:17:28,221 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:17:28,221 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 46 [2018-12-24 14:17:28,221 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:17:28,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-24 14:17:28,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-24 14:17:28,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2018-12-24 14:17:28,222 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand 47 states. [2018-12-24 14:17:28,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:17:28,828 INFO L93 Difference]: Finished difference Result 225 states and 229 transitions. [2018-12-24 14:17:28,829 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-12-24 14:17:28,829 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 104 [2018-12-24 14:17:28,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:17:28,830 INFO L225 Difference]: With dead ends: 225 [2018-12-24 14:17:28,830 INFO L226 Difference]: Without dead ends: 110 [2018-12-24 14:17:28,831 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 14:17:28,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2018-12-24 14:17:28,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 108. [2018-12-24 14:17:28,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-12-24 14:17:28,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions. [2018-12-24 14:17:28,847 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 104 [2018-12-24 14:17:28,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:17:28,847 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 110 transitions. [2018-12-24 14:17:28,847 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-24 14:17:28,847 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions. [2018-12-24 14:17:28,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-12-24 14:17:28,848 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:17:28,848 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1] [2018-12-24 14:17:28,848 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:17:28,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:17:28,848 INFO L82 PathProgramCache]: Analyzing trace with hash -1699483764, now seen corresponding path program 25 times [2018-12-24 14:17:28,848 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:17:28,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:28,849 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:17:28,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:28,849 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:17:28,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:17:29,729 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 14:17:29,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:29,729 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:17:29,729 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:17:29,729 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:17:29,730 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:29,730 INFO 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 14:17:29,739 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:17:29,739 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:17:29,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:17:29,763 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:17:30,417 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 14:17:30,417 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:17:30,495 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 14:17:30,515 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:17:30,515 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 49 [2018-12-24 14:17:30,515 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:17:30,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-24 14:17:30,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-24 14:17:30,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2320, Unknown=0, NotChecked=0, Total=2450 [2018-12-24 14:17:30,516 INFO L87 Difference]: Start difference. First operand 108 states and 110 transitions. Second operand 50 states. [2018-12-24 14:17:35,341 WARN L181 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2018-12-24 14:17:35,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:17:35,665 INFO L93 Difference]: Finished difference Result 229 states and 234 transitions. [2018-12-24 14:17:35,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-24 14:17:35,665 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 107 [2018-12-24 14:17:35,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:17:35,666 INFO L225 Difference]: With dead ends: 229 [2018-12-24 14:17:35,666 INFO L226 Difference]: Without dead ends: 171 [2018-12-24 14:17:35,667 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 14:17:35,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2018-12-24 14:17:35,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 112. [2018-12-24 14:17:35,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-12-24 14:17:35,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 114 transitions. [2018-12-24 14:17:35,690 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 114 transitions. Word has length 107 [2018-12-24 14:17:35,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:17:35,691 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 114 transitions. [2018-12-24 14:17:35,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-24 14:17:35,691 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 114 transitions. [2018-12-24 14:17:35,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-12-24 14:17:35,691 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:17:35,692 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1] [2018-12-24 14:17:35,692 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:17:35,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:17:35,692 INFO L82 PathProgramCache]: Analyzing trace with hash -1446534989, now seen corresponding path program 26 times [2018-12-24 14:17:35,692 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:17:35,693 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:35,693 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:17:35,693 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:35,693 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:17:35,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:17:36,167 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 14:17:36,168 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:36,168 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:17:36,168 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:17:36,168 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:17:36,168 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:36,168 INFO 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 14:17:36,179 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:17:36,179 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:17:36,211 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-12-24 14:17:36,211 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:17:36,213 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:17:36,668 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 14:17:36,669 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:17:37,006 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 14:17:37,025 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:17:37,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 49 [2018-12-24 14:17:37,025 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:17:37,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-24 14:17:37,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-24 14:17:37,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2018-12-24 14:17:37,027 INFO L87 Difference]: Start difference. First operand 112 states and 114 transitions. Second operand 50 states. [2018-12-24 14:17:37,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:17:37,795 INFO L93 Difference]: Finished difference Result 240 states and 244 transitions. [2018-12-24 14:17:37,796 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-12-24 14:17:37,796 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 111 [2018-12-24 14:17:37,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:17:37,797 INFO L225 Difference]: With dead ends: 240 [2018-12-24 14:17:37,797 INFO L226 Difference]: Without dead ends: 117 [2018-12-24 14:17:37,798 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 174 SyntacticMatches, 31 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1410 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1033, Invalid=3257, Unknown=0, NotChecked=0, Total=4290 [2018-12-24 14:17:37,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-12-24 14:17:37,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2018-12-24 14:17:37,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-12-24 14:17:37,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2018-12-24 14:17:37,820 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 111 [2018-12-24 14:17:37,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:17:37,820 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2018-12-24 14:17:37,820 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-24 14:17:37,820 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2018-12-24 14:17:37,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-12-24 14:17:37,821 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:17:37,821 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 1, 1, 1, 1, 1] [2018-12-24 14:17:37,822 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:17:37,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:17:37,822 INFO L82 PathProgramCache]: Analyzing trace with hash -2055366085, now seen corresponding path program 27 times [2018-12-24 14:17:37,822 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:17:37,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:37,823 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:17:37,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:37,823 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:17:37,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:17:39,266 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 14:17:39,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:39,266 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:17:39,267 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:17:39,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:17:39,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:39,267 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:17:39,276 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:17:39,276 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:17:39,297 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:17:39,297 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:17:39,300 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:17:40,012 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 14:17:40,012 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:17:40,097 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 14:17:40,117 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:17:40,117 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 52 [2018-12-24 14:17:40,117 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:17:40,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-24 14:17:40,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-24 14:17:40,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2618, Unknown=0, NotChecked=0, Total=2756 [2018-12-24 14:17:40,119 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand 53 states. [2018-12-24 14:17:45,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:17:45,635 INFO L93 Difference]: Finished difference Result 244 states and 249 transitions. [2018-12-24 14:17:45,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-24 14:17:45,642 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 114 [2018-12-24 14:17:45,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:17:45,643 INFO L225 Difference]: With dead ends: 244 [2018-12-24 14:17:45,643 INFO L226 Difference]: Without dead ends: 182 [2018-12-24 14:17:45,644 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 207 SyntacticMatches, 3 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1130 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=539, Invalid=6601, Unknown=0, NotChecked=0, Total=7140 [2018-12-24 14:17:45,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-12-24 14:17:45,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 119. [2018-12-24 14:17:45,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-12-24 14:17:45,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2018-12-24 14:17:45,665 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 114 [2018-12-24 14:17:45,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:17:45,665 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2018-12-24 14:17:45,666 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-24 14:17:45,666 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2018-12-24 14:17:45,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2018-12-24 14:17:45,666 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:17:45,666 INFO L402 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1] [2018-12-24 14:17:45,667 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:17:45,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:17:45,667 INFO L82 PathProgramCache]: Analyzing trace with hash 1833851874, now seen corresponding path program 28 times [2018-12-24 14:17:45,667 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:17:45,668 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:45,668 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:17:45,668 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:45,668 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:17:45,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:17:46,505 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 14:17:46,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:46,505 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:17:46,506 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:17:46,506 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:17:46,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:46,506 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 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 14:17:46,517 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:17:46,517 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:17:46,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:17:46,540 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:17:47,039 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 14:17:47,040 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:17:47,490 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 14:17:47,508 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:17:47,509 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 52 [2018-12-24 14:17:47,509 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:17:47,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-24 14:17:47,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-24 14:17:47,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2018-12-24 14:17:47,510 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand 53 states. [2018-12-24 14:17:48,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:17:48,516 INFO L93 Difference]: Finished difference Result 255 states and 259 transitions. [2018-12-24 14:17:48,516 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-12-24 14:17:48,517 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 118 [2018-12-24 14:17:48,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:17:48,518 INFO L225 Difference]: With dead ends: 255 [2018-12-24 14:17:48,518 INFO L226 Difference]: Without dead ends: 124 [2018-12-24 14:17:48,519 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 185 SyntacticMatches, 33 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1600 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1157, Invalid=3673, Unknown=0, NotChecked=0, Total=4830 [2018-12-24 14:17:48,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-24 14:17:48,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 122. [2018-12-24 14:17:48,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-12-24 14:17:48,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 124 transitions. [2018-12-24 14:17:48,539 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 124 transitions. Word has length 118 [2018-12-24 14:17:48,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:17:48,539 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 124 transitions. [2018-12-24 14:17:48,539 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-24 14:17:48,540 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 124 transitions. [2018-12-24 14:17:48,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-12-24 14:17:48,540 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:17:48,540 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1] [2018-12-24 14:17:48,541 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:17:48,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:17:48,541 INFO L82 PathProgramCache]: Analyzing trace with hash 540940634, now seen corresponding path program 29 times [2018-12-24 14:17:48,541 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:17:48,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:48,542 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:17:48,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:17:48,542 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:17:48,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:17:49,517 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 14:17:49,517 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:49,517 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:17:49,517 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:17:49,517 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:17:49,517 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:17:49,517 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:17:49,526 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:17:49,526 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:17:49,559 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-24 14:17:49,559 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:17:49,562 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:17:51,572 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 14:17:51,572 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:17:53,660 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 14:17:53,679 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:17:53,679 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 38, 38] total 93 [2018-12-24 14:17:53,679 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:17:53,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-12-24 14:17:53,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-12-24 14:17:53,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=995, Invalid=7747, Unknown=0, NotChecked=0, Total=8742 [2018-12-24 14:17:53,682 INFO L87 Difference]: Start difference. First operand 122 states and 124 transitions. Second operand 75 states. [2018-12-24 14:18:02,804 WARN L181 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2018-12-24 14:18:04,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:18:04,195 INFO L93 Difference]: Finished difference Result 325 states and 331 transitions. [2018-12-24 14:18:04,195 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-12-24 14:18:04,196 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 121 [2018-12-24 14:18:04,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:18:04,197 INFO L225 Difference]: With dead ends: 325 [2018-12-24 14:18:04,198 INFO L226 Difference]: Without dead ends: 190 [2018-12-24 14:18:04,201 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 14:18:04,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-12-24 14:18:04,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 129. [2018-12-24 14:18:04,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-12-24 14:18:04,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 131 transitions. [2018-12-24 14:18:04,239 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 131 transitions. Word has length 121 [2018-12-24 14:18:04,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:18:04,240 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 131 transitions. [2018-12-24 14:18:04,240 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-12-24 14:18:04,240 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 131 transitions. [2018-12-24 14:18:04,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-12-24 14:18:04,241 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:18:04,241 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 1, 1, 1, 1, 1] [2018-12-24 14:18:04,241 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:18:04,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:18:04,241 INFO L82 PathProgramCache]: Analyzing trace with hash -1991581943, now seen corresponding path program 30 times [2018-12-24 14:18:04,241 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:18:04,242 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:18:04,242 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:18:04,242 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:18:04,243 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:18:04,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:18:05,366 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 14:18:05,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:18:05,367 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:18:05,367 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:18:05,367 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:18:05,368 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:18:05,368 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:18:05,376 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:18:05,376 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:18:05,397 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:18:05,398 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:18:05,400 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:18:06,273 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 14:18:06,273 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:18:06,409 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 14:18:06,427 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:18:06,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 58 [2018-12-24 14:18:06,428 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:18:06,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-24 14:18:06,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-24 14:18:06,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=3268, Unknown=0, NotChecked=0, Total=3422 [2018-12-24 14:18:06,429 INFO L87 Difference]: Start difference. First operand 129 states and 131 transitions. Second operand 59 states. [2018-12-24 14:18:12,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:18:12,155 INFO L93 Difference]: Finished difference Result 274 states and 279 transitions. [2018-12-24 14:18:12,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-24 14:18:12,155 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 128 [2018-12-24 14:18:12,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:18:12,157 INFO L225 Difference]: With dead ends: 274 [2018-12-24 14:18:12,157 INFO L226 Difference]: Without dead ends: 204 [2018-12-24 14:18:12,158 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 233 SyntacticMatches, 3 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1414 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=641, Invalid=8289, Unknown=0, NotChecked=0, Total=8930 [2018-12-24 14:18:12,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-12-24 14:18:12,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 133. [2018-12-24 14:18:12,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-12-24 14:18:12,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2018-12-24 14:18:12,181 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 128 [2018-12-24 14:18:12,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:18:12,182 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2018-12-24 14:18:12,182 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-24 14:18:12,182 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2018-12-24 14:18:12,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-12-24 14:18:12,182 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:18:12,182 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1] [2018-12-24 14:18:12,183 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:18:12,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:18:12,183 INFO L82 PathProgramCache]: Analyzing trace with hash -1942976080, now seen corresponding path program 31 times [2018-12-24 14:18:12,183 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:18:12,183 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:18:12,184 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:18:12,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:18:12,184 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:18:12,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:18:12,880 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 14:18:12,880 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:18:12,880 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:18:12,880 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:18:12,880 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:18:12,881 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:18:12,881 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:18:12,893 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:18:12,893 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:18:12,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:18:12,920 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:18:13,869 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 14:18:13,869 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:18:14,322 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 14:18:14,340 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:18:14,341 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 58 [2018-12-24 14:18:14,341 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:18:14,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-24 14:18:14,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-24 14:18:14,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2018-12-24 14:18:14,342 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand 59 states. [2018-12-24 14:18:15,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:18:15,245 INFO L93 Difference]: Finished difference Result 285 states and 289 transitions. [2018-12-24 14:18:15,245 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-12-24 14:18:15,245 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 132 [2018-12-24 14:18:15,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:18:15,247 INFO L225 Difference]: With dead ends: 285 [2018-12-24 14:18:15,247 INFO L226 Difference]: Without dead ends: 138 [2018-12-24 14:18:15,248 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 207 SyntacticMatches, 37 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2016 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1426, Invalid=4580, Unknown=0, NotChecked=0, Total=6006 [2018-12-24 14:18:15,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-12-24 14:18:15,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2018-12-24 14:18:15,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-12-24 14:18:15,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 138 transitions. [2018-12-24 14:18:15,277 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 138 transitions. Word has length 132 [2018-12-24 14:18:15,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:18:15,278 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 138 transitions. [2018-12-24 14:18:15,278 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-24 14:18:15,278 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 138 transitions. [2018-12-24 14:18:15,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-12-24 14:18:15,279 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:18:15,279 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1] [2018-12-24 14:18:15,279 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:18:15,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:18:15,279 INFO L82 PathProgramCache]: Analyzing trace with hash 220943656, now seen corresponding path program 32 times [2018-12-24 14:18:15,279 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:18:15,280 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:18:15,280 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:18:15,280 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:18:15,280 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:18:15,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:18:16,501 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 14:18:16,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:18:16,502 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:18:16,502 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:18:16,502 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:18:16,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:18:16,502 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:18:16,512 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:18:16,512 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:18:16,554 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-12-24 14:18:16,554 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:18:16,557 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:18:19,190 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 14:18:19,190 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:18:21,383 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 14:18:21,402 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:18:21,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 42, 42] total 103 [2018-12-24 14:18:21,402 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:18:21,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-24 14:18:21,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-24 14:18:21,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1204, Invalid=9508, Unknown=0, NotChecked=0, Total=10712 [2018-12-24 14:18:21,404 INFO L87 Difference]: Start difference. First operand 136 states and 138 transitions. Second operand 83 states. [2018-12-24 14:18:32,539 WARN L181 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2018-12-24 14:18:32,839 WARN L181 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2018-12-24 14:18:33,705 WARN L181 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2018-12-24 14:18:35,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:18:35,542 INFO L93 Difference]: Finished difference Result 363 states and 369 transitions. [2018-12-24 14:18:35,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2018-12-24 14:18:35,543 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 135 [2018-12-24 14:18:35,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:18:35,544 INFO L225 Difference]: With dead ends: 363 [2018-12-24 14:18:35,545 INFO L226 Difference]: Without dead ends: 212 [2018-12-24 14:18:35,547 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 187 SyntacticMatches, 20 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10242 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=3677, Invalid=43629, Unknown=0, NotChecked=0, Total=47306 [2018-12-24 14:18:35,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2018-12-24 14:18:35,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 143. [2018-12-24 14:18:35,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2018-12-24 14:18:35,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2018-12-24 14:18:35,573 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 135 [2018-12-24 14:18:35,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:18:35,573 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2018-12-24 14:18:35,573 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-24 14:18:35,573 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2018-12-24 14:18:35,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2018-12-24 14:18:35,574 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:18:35,574 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 1, 1, 1, 1, 1] [2018-12-24 14:18:35,574 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:18:35,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:18:35,574 INFO L82 PathProgramCache]: Analyzing trace with hash 847427031, now seen corresponding path program 33 times [2018-12-24 14:18:35,574 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:18:35,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:18:35,575 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:18:35,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:18:35,575 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:18:35,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:18:36,821 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 14:18:36,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:18:36,821 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:18:36,821 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:18:36,821 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:18:36,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:18:36,821 INFO 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 14:18:36,830 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:18:36,830 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:18:36,864 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:18:36,864 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:18:36,868 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:18:37,992 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 14:18:37,992 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:18:38,114 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 14:18:38,133 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:18:38,134 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 64 [2018-12-24 14:18:38,134 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:18:38,134 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-24 14:18:38,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-24 14:18:38,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3990, Unknown=0, NotChecked=0, Total=4160 [2018-12-24 14:18:38,135 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand 65 states. [2018-12-24 14:18:42,619 WARN L181 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2018-12-24 14:18:42,895 WARN L181 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2018-12-24 14:18:43,156 WARN L181 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2018-12-24 14:18:43,339 WARN L181 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-24 14:18:43,859 WARN L181 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2018-12-24 14:18:44,052 WARN L181 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2018-12-24 14:18:45,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:18:45,166 INFO L93 Difference]: Finished difference Result 304 states and 309 transitions. [2018-12-24 14:18:45,166 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-24 14:18:45,166 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 142 [2018-12-24 14:18:45,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:18:45,168 INFO L225 Difference]: With dead ends: 304 [2018-12-24 14:18:45,168 INFO L226 Difference]: Without dead ends: 226 [2018-12-24 14:18:45,169 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 259 SyntacticMatches, 3 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1730 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=751, Invalid=10169, Unknown=0, NotChecked=0, Total=10920 [2018-12-24 14:18:45,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2018-12-24 14:18:45,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 147. [2018-12-24 14:18:45,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-12-24 14:18:45,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 149 transitions. [2018-12-24 14:18:45,205 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 149 transitions. Word has length 142 [2018-12-24 14:18:45,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:18:45,205 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 149 transitions. [2018-12-24 14:18:45,205 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-24 14:18:45,206 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 149 transitions. [2018-12-24 14:18:45,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-12-24 14:18:45,206 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:18:45,207 INFO L402 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1] [2018-12-24 14:18:45,207 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:18:45,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:18:45,207 INFO L82 PathProgramCache]: Analyzing trace with hash -1796978306, now seen corresponding path program 34 times [2018-12-24 14:18:45,207 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:18:45,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:18:45,208 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:18:45,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:18:45,208 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:18:45,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:18:46,266 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 14:18:46,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:18:46,267 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:18:46,267 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:18:46,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:18:46,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:18:46,267 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:18:46,276 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:18:46,276 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:18:46,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:18:46,306 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:18:47,128 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 14:18:47,128 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:18:47,652 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 14:18:47,671 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:18:47,672 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 64 [2018-12-24 14:18:47,672 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:18:47,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-24 14:18:47,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-24 14:18:47,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2018-12-24 14:18:47,673 INFO L87 Difference]: Start difference. First operand 147 states and 149 transitions. Second operand 65 states. [2018-12-24 14:18:49,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:18:49,251 INFO L93 Difference]: Finished difference Result 315 states and 319 transitions. [2018-12-24 14:18:49,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-24 14:18:49,252 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 146 [2018-12-24 14:18:49,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:18:49,253 INFO L225 Difference]: With dead ends: 315 [2018-12-24 14:18:49,253 INFO L226 Difference]: Without dead ends: 152 [2018-12-24 14:18:49,254 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 229 SyntacticMatches, 41 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2480 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1723, Invalid=5587, Unknown=0, NotChecked=0, Total=7310 [2018-12-24 14:18:49,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-12-24 14:18:49,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 150. [2018-12-24 14:18:49,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-12-24 14:18:49,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 152 transitions. [2018-12-24 14:18:49,289 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 152 transitions. Word has length 146 [2018-12-24 14:18:49,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:18:49,290 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 152 transitions. [2018-12-24 14:18:49,290 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-24 14:18:49,290 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 152 transitions. [2018-12-24 14:18:49,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-12-24 14:18:49,291 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:18:49,291 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1] [2018-12-24 14:18:49,291 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:18:49,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:18:49,291 INFO L82 PathProgramCache]: Analyzing trace with hash -193355018, now seen corresponding path program 35 times [2018-12-24 14:18:49,291 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:18:49,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:18:49,292 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:18:49,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:18:49,292 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:18:49,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:18:50,570 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 14:18:50,571 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:18:50,571 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:18:50,571 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:18:50,571 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:18:50,571 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:18:50,571 INFO 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 14:18:50,581 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:18:50,581 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:18:50,620 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-12-24 14:18:50,620 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:18:50,623 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:18:53,476 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 14:18:53,476 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:18:56,349 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 14:18:56,368 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:18:56,368 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 46, 46] total 113 [2018-12-24 14:18:56,368 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:18:56,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2018-12-24 14:18:56,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2018-12-24 14:18:56,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=11449, Unknown=0, NotChecked=0, Total=12882 [2018-12-24 14:18:56,373 INFO L87 Difference]: Start difference. First operand 150 states and 152 transitions. Second operand 91 states. [2018-12-24 14:19:08,375 WARN L181 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2018-12-24 14:19:08,690 WARN L181 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2018-12-24 14:19:09,010 WARN L181 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2018-12-24 14:19:09,282 WARN L181 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:19:09,606 WARN L181 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-24 14:19:12,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:19:12,048 INFO L93 Difference]: Finished difference Result 401 states and 407 transitions. [2018-12-24 14:19:12,048 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2018-12-24 14:19:12,048 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 149 [2018-12-24 14:19:12,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:19:12,049 INFO L225 Difference]: With dead ends: 401 [2018-12-24 14:19:12,049 INFO L226 Difference]: Without dead ends: 234 [2018-12-24 14:19:12,051 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 207 SyntacticMatches, 22 SemanticMatches, 238 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12431 ImplicationChecksByTransitivity, 18.7s TimeCoverageRelationStatistics Valid=4355, Invalid=53005, Unknown=0, NotChecked=0, Total=57360 [2018-12-24 14:19:12,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2018-12-24 14:19:12,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 157. [2018-12-24 14:19:12,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-12-24 14:19:12,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2018-12-24 14:19:12,080 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 149 [2018-12-24 14:19:12,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:19:12,081 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2018-12-24 14:19:12,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has 91 states. [2018-12-24 14:19:12,081 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2018-12-24 14:19:12,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-12-24 14:19:12,082 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:19:12,082 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 1, 1, 1, 1, 1] [2018-12-24 14:19:12,082 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:19:12,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:19:12,083 INFO L82 PathProgramCache]: Analyzing trace with hash 1380130469, now seen corresponding path program 36 times [2018-12-24 14:19:12,083 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:19:12,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:19:12,084 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:19:12,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:19:12,084 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:19:12,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:19:13,967 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 14:19:13,968 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:19:13,968 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:19:13,968 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:19:13,968 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:19:13,968 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:19:13,968 INFO 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 14:19:13,977 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:19:13,977 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:19:14,003 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:19:14,003 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:19:14,007 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:19:15,838 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 14:19:15,838 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:19:15,973 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 14:19:15,992 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:19:15,992 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 70 [2018-12-24 14:19:15,992 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:19:15,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-24 14:19:15,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-24 14:19:15,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=4784, Unknown=0, NotChecked=0, Total=4970 [2018-12-24 14:19:15,994 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand 71 states. [2018-12-24 14:19:21,937 WARN L181 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2018-12-24 14:19:22,257 WARN L181 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2018-12-24 14:19:22,561 WARN L181 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2018-12-24 14:19:22,768 WARN L181 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 14:19:22,967 WARN L181 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:19:25,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:19:25,155 INFO L93 Difference]: Finished difference Result 334 states and 339 transitions. [2018-12-24 14:19:25,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-24 14:19:25,155 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 156 [2018-12-24 14:19:25,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:19:25,156 INFO L225 Difference]: With dead ends: 334 [2018-12-24 14:19:25,156 INFO L226 Difference]: Without dead ends: 248 [2018-12-24 14:19:25,157 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 285 SyntacticMatches, 3 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2078 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=869, Invalid=12241, Unknown=0, NotChecked=0, Total=13110 [2018-12-24 14:19:25,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2018-12-24 14:19:25,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 161. [2018-12-24 14:19:25,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2018-12-24 14:19:25,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 163 transitions. [2018-12-24 14:19:25,188 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 163 transitions. Word has length 156 [2018-12-24 14:19:25,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:19:25,189 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 163 transitions. [2018-12-24 14:19:25,189 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-24 14:19:25,189 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 163 transitions. [2018-12-24 14:19:25,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2018-12-24 14:19:25,190 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:19:25,190 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1] [2018-12-24 14:19:25,190 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:19:25,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:19:25,190 INFO L82 PathProgramCache]: Analyzing trace with hash -1719166132, now seen corresponding path program 37 times [2018-12-24 14:19:25,190 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:19:25,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:19:25,191 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:19:25,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:19:25,191 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:19:25,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:19:27,395 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 14:19:27,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:19:27,395 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:19:27,395 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:19:27,395 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:19:27,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:19:27,395 INFO 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 14:19:27,405 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:19:27,405 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:19:27,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:19:27,454 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:19:28,370 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 14:19:28,370 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:19:29,012 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 14:19:29,030 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:19:29,031 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 70 [2018-12-24 14:19:29,031 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:19:29,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-24 14:19:29,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-24 14:19:29,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2018-12-24 14:19:29,032 INFO L87 Difference]: Start difference. First operand 161 states and 163 transitions. Second operand 71 states. [2018-12-24 14:19:30,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:19:30,875 INFO L93 Difference]: Finished difference Result 345 states and 349 transitions. [2018-12-24 14:19:30,878 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-12-24 14:19:30,878 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 160 [2018-12-24 14:19:30,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:19:30,879 INFO L225 Difference]: With dead ends: 345 [2018-12-24 14:19:30,879 INFO L226 Difference]: Without dead ends: 166 [2018-12-24 14:19:30,880 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 251 SyntacticMatches, 45 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2992 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2048, Invalid=6694, Unknown=0, NotChecked=0, Total=8742 [2018-12-24 14:19:30,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-12-24 14:19:30,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 164. [2018-12-24 14:19:30,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-12-24 14:19:30,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 166 transitions. [2018-12-24 14:19:30,909 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 166 transitions. Word has length 160 [2018-12-24 14:19:30,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:19:30,909 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 166 transitions. [2018-12-24 14:19:30,909 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-24 14:19:30,910 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 166 transitions. [2018-12-24 14:19:30,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-12-24 14:19:30,910 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:19:30,910 INFO L402 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1] [2018-12-24 14:19:30,911 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:19:30,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:19:30,911 INFO L82 PathProgramCache]: Analyzing trace with hash -148438332, now seen corresponding path program 38 times [2018-12-24 14:19:30,911 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:19:30,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:19:30,912 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:19:30,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:19:30,912 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:19:30,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:19:33,107 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 14:19:33,107 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:19:33,108 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:19:33,108 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:19:33,108 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:19:33,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:19:33,108 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:19:33,119 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:19:33,120 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:19:33,163 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-24 14:19:33,163 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:19:33,166 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:19:34,527 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 14:19:34,527 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:19:34,676 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 14:19:34,696 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:19:34,697 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48, 48] total 73 [2018-12-24 14:19:34,697 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:19:34,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-24 14:19:34,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-24 14:19:34,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=5208, Unknown=0, NotChecked=0, Total=5402 [2018-12-24 14:19:34,698 INFO L87 Difference]: Start difference. First operand 164 states and 166 transitions. Second operand 74 states. [2018-12-24 14:19:41,985 WARN L181 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2018-12-24 14:19:42,319 WARN L181 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2018-12-24 14:19:42,637 WARN L181 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2018-12-24 14:19:42,850 WARN L181 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 14:19:43,048 WARN L181 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 14:19:43,245 WARN L181 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:19:45,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:19:45,554 INFO L93 Difference]: Finished difference Result 349 states and 354 transitions. [2018-12-24 14:19:45,554 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-24 14:19:45,554 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 163 [2018-12-24 14:19:45,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:19:45,556 INFO L225 Difference]: With dead ends: 349 [2018-12-24 14:19:45,556 INFO L226 Difference]: Without dead ends: 259 [2018-12-24 14:19:45,557 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 298 SyntacticMatches, 3 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2264 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=931, Invalid=13349, Unknown=0, NotChecked=0, Total=14280 [2018-12-24 14:19:45,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2018-12-24 14:19:45,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 168. [2018-12-24 14:19:45,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-12-24 14:19:45,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 170 transitions. [2018-12-24 14:19:45,590 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 170 transitions. Word has length 163 [2018-12-24 14:19:45,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:19:45,590 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 170 transitions. [2018-12-24 14:19:45,590 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-24 14:19:45,590 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 170 transitions. [2018-12-24 14:19:45,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-12-24 14:19:45,591 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:19:45,591 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1] [2018-12-24 14:19:45,591 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:19:45,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:19:45,591 INFO L82 PathProgramCache]: Analyzing trace with hash -1550952469, now seen corresponding path program 39 times [2018-12-24 14:19:45,591 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:19:45,592 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:19:45,592 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:19:45,592 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:19:45,592 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:19:45,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:19:46,580 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 14:19:46,581 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:19:46,581 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:19:46,581 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:19:46,581 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:19:46,581 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:19:46,581 INFO 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 14:19:46,589 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:19:46,590 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:19:46,616 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:19:46,617 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:19:46,620 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:19:47,625 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 14:19:47,626 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:19:48,320 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 14:19:48,364 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:19:48,364 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 73 [2018-12-24 14:19:48,365 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:19:48,365 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-24 14:19:48,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-24 14:19:48,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2018-12-24 14:19:48,366 INFO L87 Difference]: Start difference. First operand 168 states and 170 transitions. Second operand 74 states. [2018-12-24 14:19:50,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:19:50,163 INFO L93 Difference]: Finished difference Result 360 states and 364 transitions. [2018-12-24 14:19:50,163 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-12-24 14:19:50,163 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 167 [2018-12-24 14:19:50,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:19:50,165 INFO L225 Difference]: With dead ends: 360 [2018-12-24 14:19:50,165 INFO L226 Difference]: Without dead ends: 173 [2018-12-24 14:19:50,166 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 262 SyntacticMatches, 47 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3266 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2221, Invalid=7285, Unknown=0, NotChecked=0, Total=9506 [2018-12-24 14:19:50,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2018-12-24 14:19:50,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 171. [2018-12-24 14:19:50,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-12-24 14:19:50,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 173 transitions. [2018-12-24 14:19:50,200 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 173 transitions. Word has length 167 [2018-12-24 14:19:50,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:19:50,200 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 173 transitions. [2018-12-24 14:19:50,200 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-24 14:19:50,200 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 173 transitions. [2018-12-24 14:19:50,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-12-24 14:19:50,201 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:19:50,201 INFO L402 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 1, 1, 1, 1, 1] [2018-12-24 14:19:50,201 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:19:50,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:19:50,201 INFO L82 PathProgramCache]: Analyzing trace with hash -810935949, now seen corresponding path program 40 times [2018-12-24 14:19:50,201 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:19:50,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:19:50,202 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:19:50,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:19:50,202 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:19:50,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:19:52,201 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 14:19:52,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:19:52,202 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:19:52,202 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:19:52,202 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:19:52,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:19:52,202 INFO 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 14:19:52,211 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:19:52,211 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:19:52,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:19:52,250 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:19:53,961 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 14:19:53,962 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:19:54,111 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 14:19:54,130 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:19:54,131 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 76 [2018-12-24 14:19:54,131 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:19:54,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-24 14:19:54,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-24 14:19:54,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=5650, Unknown=0, NotChecked=0, Total=5852 [2018-12-24 14:19:54,132 INFO L87 Difference]: Start difference. First operand 171 states and 173 transitions. Second operand 77 states. [2018-12-24 14:20:01,921 WARN L181 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 123 [2018-12-24 14:20:02,273 WARN L181 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 123 [2018-12-24 14:20:02,614 WARN L181 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2018-12-24 14:20:02,846 WARN L181 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 14:20:03,069 WARN L181 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 14:20:03,283 WARN L181 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 14:20:03,488 WARN L181 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:20:05,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:20:05,688 INFO L93 Difference]: Finished difference Result 364 states and 369 transitions. [2018-12-24 14:20:05,688 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-24 14:20:05,688 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 170 [2018-12-24 14:20:05,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:20:05,690 INFO L225 Difference]: With dead ends: 364 [2018-12-24 14:20:05,690 INFO L226 Difference]: Without dead ends: 270 [2018-12-24 14:20:05,691 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 311 SyntacticMatches, 3 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2458 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=995, Invalid=14505, Unknown=0, NotChecked=0, Total=15500 [2018-12-24 14:20:05,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2018-12-24 14:20:05,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 175. [2018-12-24 14:20:05,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-12-24 14:20:05,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 177 transitions. [2018-12-24 14:20:05,726 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 177 transitions. Word has length 170 [2018-12-24 14:20:05,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:20:05,726 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 177 transitions. [2018-12-24 14:20:05,726 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-24 14:20:05,726 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 177 transitions. [2018-12-24 14:20:05,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-12-24 14:20:05,727 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:20:05,727 INFO L402 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1] [2018-12-24 14:20:05,727 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:20:05,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:20:05,727 INFO L82 PathProgramCache]: Analyzing trace with hash -1036484838, now seen corresponding path program 41 times [2018-12-24 14:20:05,727 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:20:05,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:20:05,728 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:20:05,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:20:05,728 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:20:05,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:20:06,925 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 14:20:06,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:20:06,926 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:20:06,926 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:20:06,926 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:20:06,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:20:06,926 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 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 14:20:06,940 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:20:06,941 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:20:07,063 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-12-24 14:20:07,063 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:20:07,066 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:20:08,374 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 14:20:08,375 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:20:09,124 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 14:20:09,143 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:20:09,144 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 76 [2018-12-24 14:20:09,144 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:20:09,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-24 14:20:09,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-24 14:20:09,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2018-12-24 14:20:09,145 INFO L87 Difference]: Start difference. First operand 175 states and 177 transitions. Second operand 77 states. [2018-12-24 14:20:11,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:20:11,217 INFO L93 Difference]: Finished difference Result 375 states and 379 transitions. [2018-12-24 14:20:11,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-12-24 14:20:11,218 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 174 [2018-12-24 14:20:11,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:20:11,219 INFO L225 Difference]: With dead ends: 375 [2018-12-24 14:20:11,219 INFO L226 Difference]: Without dead ends: 180 [2018-12-24 14:20:11,221 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 273 SyntacticMatches, 49 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3552 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2401, Invalid=7901, Unknown=0, NotChecked=0, Total=10302 [2018-12-24 14:20:11,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-12-24 14:20:11,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 178. [2018-12-24 14:20:11,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-12-24 14:20:11,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 180 transitions. [2018-12-24 14:20:11,265 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 180 transitions. Word has length 174 [2018-12-24 14:20:11,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:20:11,265 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 180 transitions. [2018-12-24 14:20:11,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-24 14:20:11,265 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 180 transitions. [2018-12-24 14:20:11,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-12-24 14:20:11,266 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:20:11,266 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1] [2018-12-24 14:20:11,266 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:20:11,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:20:11,266 INFO L82 PathProgramCache]: Analyzing trace with hash -1003391854, now seen corresponding path program 42 times [2018-12-24 14:20:11,266 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:20:11,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:20:11,267 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:20:11,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:20:11,267 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:20:11,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:20:13,300 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 14:20:13,300 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:20:13,301 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:20:13,301 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:20:13,301 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:20:13,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:20:13,301 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 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 14:20:13,317 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:20:13,317 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:20:13,355 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:20:13,355 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:20:13,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:20:15,025 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 14:20:15,025 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:20:15,189 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 14:20:15,208 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:20:15,208 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52, 52] total 79 [2018-12-24 14:20:15,208 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:20:15,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-12-24 14:20:15,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-12-24 14:20:15,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=6110, Unknown=0, NotChecked=0, Total=6320 [2018-12-24 14:20:15,210 INFO L87 Difference]: Start difference. First operand 178 states and 180 transitions. Second operand 80 states. [2018-12-24 14:20:21,983 WARN L181 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2018-12-24 14:20:22,350 WARN L181 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2018-12-24 14:20:22,726 WARN L181 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 123 [2018-12-24 14:20:22,975 WARN L181 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 14:20:23,211 WARN L181 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 14:20:23,436 WARN L181 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 14:20:23,654 WARN L181 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 14:20:23,864 WARN L181 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:20:26,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:20:26,112 INFO L93 Difference]: Finished difference Result 379 states and 384 transitions. [2018-12-24 14:20:26,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2018-12-24 14:20:26,113 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 177 [2018-12-24 14:20:26,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:20:26,115 INFO L225 Difference]: With dead ends: 379 [2018-12-24 14:20:26,115 INFO L226 Difference]: Without dead ends: 281 [2018-12-24 14:20:26,117 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 324 SyntacticMatches, 3 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2660 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=1061, Invalid=15709, Unknown=0, NotChecked=0, Total=16770 [2018-12-24 14:20:26,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2018-12-24 14:20:26,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 182. [2018-12-24 14:20:26,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-12-24 14:20:26,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 184 transitions. [2018-12-24 14:20:26,168 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 184 transitions. Word has length 177 [2018-12-24 14:20:26,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:20:26,169 INFO L480 AbstractCegarLoop]: Abstraction has 182 states and 184 transitions. [2018-12-24 14:20:26,169 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-12-24 14:20:26,169 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 184 transitions. [2018-12-24 14:20:26,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2018-12-24 14:20:26,170 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:20:26,170 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1] [2018-12-24 14:20:26,170 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:20:26,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:20:26,171 INFO L82 PathProgramCache]: Analyzing trace with hash 525284025, now seen corresponding path program 43 times [2018-12-24 14:20:26,171 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:20:26,171 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:20:26,171 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:20:26,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:20:26,172 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:20:26,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:20:29,588 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 14:20:29,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:20:29,589 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:20:29,589 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:20:29,589 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:20:29,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:20:29,589 INFO 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 14:20:29,600 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:20:29,600 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:20:29,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:20:29,640 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:20:30,846 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 14:20:30,846 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:20:31,967 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 14:20:31,985 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:20:31,986 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 79 [2018-12-24 14:20:31,986 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:20:31,986 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-12-24 14:20:31,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-12-24 14:20:31,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2018-12-24 14:20:31,987 INFO L87 Difference]: Start difference. First operand 182 states and 184 transitions. Second operand 80 states. [2018-12-24 14:20:34,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:20:34,010 INFO L93 Difference]: Finished difference Result 390 states and 394 transitions. [2018-12-24 14:20:34,011 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-24 14:20:34,011 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 181 [2018-12-24 14:20:34,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:20:34,012 INFO L225 Difference]: With dead ends: 390 [2018-12-24 14:20:34,013 INFO L226 Difference]: Without dead ends: 187 [2018-12-24 14:20:34,014 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 439 GetRequests, 284 SyntacticMatches, 51 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3850 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=2588, Invalid=8542, Unknown=0, NotChecked=0, Total=11130 [2018-12-24 14:20:34,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-12-24 14:20:34,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 185. [2018-12-24 14:20:34,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 185 states. [2018-12-24 14:20:34,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 187 transitions. [2018-12-24 14:20:34,052 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 187 transitions. Word has length 181 [2018-12-24 14:20:34,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:20:34,053 INFO L480 AbstractCegarLoop]: Abstraction has 185 states and 187 transitions. [2018-12-24 14:20:34,053 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-12-24 14:20:34,053 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 187 transitions. [2018-12-24 14:20:34,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2018-12-24 14:20:34,053 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:20:34,054 INFO L402 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 25, 1, 1, 1, 1, 1] [2018-12-24 14:20:34,054 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:20:34,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:20:34,054 INFO L82 PathProgramCache]: Analyzing trace with hash -1479170495, now seen corresponding path program 44 times [2018-12-24 14:20:34,054 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:20:34,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:20:34,055 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:20:34,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:20:34,055 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:20:34,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:20:37,268 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 14:20:37,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:20:37,269 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:20:37,269 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:20:37,269 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:20:37,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:20:37,269 INFO 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 14:20:37,279 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:20:37,279 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:20:37,335 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-12-24 14:20:37,335 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:20:37,339 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:20:41,781 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 14:20:41,781 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:20:45,817 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 14:20:45,836 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:20:45,837 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 56, 56] total 138 [2018-12-24 14:20:45,837 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:20:45,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 111 states [2018-12-24 14:20:45,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2018-12-24 14:20:45,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2093, Invalid=17089, Unknown=0, NotChecked=0, Total=19182 [2018-12-24 14:20:45,838 INFO L87 Difference]: Start difference. First operand 185 states and 187 transitions. Second operand 111 states. [2018-12-24 14:21:04,040 WARN L181 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2018-12-24 14:21:04,493 WARN L181 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2018-12-24 14:21:04,968 WARN L181 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2018-12-24 14:21:05,375 WARN L181 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 14:21:05,753 WARN L181 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 14:21:06,112 WARN L181 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 14:21:06,455 WARN L181 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 14:21:06,792 WARN L181 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 14:21:07,124 WARN L181 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:21:07,473 WARN L181 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-24 14:21:10,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:21:10,338 INFO L93 Difference]: Finished difference Result 496 states and 502 transitions. [2018-12-24 14:21:10,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 184 states. [2018-12-24 14:21:10,338 INFO L78 Accepts]: Start accepts. Automaton has 111 states. Word has length 184 [2018-12-24 14:21:10,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:21:10,340 INFO L225 Difference]: With dead ends: 496 [2018-12-24 14:21:10,341 INFO L226 Difference]: Without dead ends: 289 [2018-12-24 14:21:10,344 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 577 GetRequests, 257 SyntacticMatches, 27 SemanticMatches, 293 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18831 ImplicationChecksByTransitivity, 29.4s TimeCoverageRelationStatistics Valid=6295, Invalid=80435, Unknown=0, NotChecked=0, Total=86730 [2018-12-24 14:21:10,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2018-12-24 14:21:10,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 192. [2018-12-24 14:21:10,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-12-24 14:21:10,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 194 transitions. [2018-12-24 14:21:10,385 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 194 transitions. Word has length 184 [2018-12-24 14:21:10,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:21:10,385 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 194 transitions. [2018-12-24 14:21:10,385 INFO L481 AbstractCegarLoop]: Interpolant automaton has 111 states. [2018-12-24 14:21:10,386 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 194 transitions. [2018-12-24 14:21:10,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-12-24 14:21:10,386 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:21:10,386 INFO L402 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 26, 26, 26, 1, 1, 1, 1, 1] [2018-12-24 14:21:10,387 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:21:10,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:21:10,387 INFO L82 PathProgramCache]: Analyzing trace with hash -1734936480, now seen corresponding path program 45 times [2018-12-24 14:21:10,387 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:21:10,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:21:10,387 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:21:10,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:21:10,388 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:21:10,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:21:13,347 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 14:21:13,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:21:13,348 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:21:13,348 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:21:13,348 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:21:13,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:21:13,348 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:21:13,356 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:21:13,356 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:21:13,385 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:21:13,385 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:21:13,389 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:21:15,434 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 14:21:15,434 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:21:15,818 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 14:21:15,838 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:21:15,838 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56, 56] total 85 [2018-12-24 14:21:15,838 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:21:15,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-24 14:21:15,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-24 14:21:15,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=7084, Unknown=0, NotChecked=0, Total=7310 [2018-12-24 14:21:15,839 INFO L87 Difference]: Start difference. First operand 192 states and 194 transitions. Second operand 86 states. [2018-12-24 14:21:24,604 WARN L181 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-12-24 14:21:25,019 WARN L181 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-12-24 14:21:25,438 WARN L181 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2018-12-24 14:21:25,715 WARN L181 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 14:21:25,980 WARN L181 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 14:21:26,237 WARN L181 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 14:21:26,489 WARN L181 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 14:21:26,719 WARN L181 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 14:21:26,949 WARN L181 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 14:21:27,164 WARN L181 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:21:27,586 WARN L181 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2018-12-24 14:21:27,848 WARN L181 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2018-12-24 14:21:29,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:21:29,662 INFO L93 Difference]: Finished difference Result 409 states and 414 transitions. [2018-12-24 14:21:29,662 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-12-24 14:21:29,662 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 191 [2018-12-24 14:21:29,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:21:29,664 INFO L225 Difference]: With dead ends: 409 [2018-12-24 14:21:29,664 INFO L226 Difference]: Without dead ends: 303 [2018-12-24 14:21:29,665 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 350 SyntacticMatches, 3 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3088 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=1199, Invalid=18261, Unknown=0, NotChecked=0, Total=19460 [2018-12-24 14:21:29,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2018-12-24 14:21:29,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 196. [2018-12-24 14:21:29,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-12-24 14:21:29,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 198 transitions. [2018-12-24 14:21:29,709 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 198 transitions. Word has length 191 [2018-12-24 14:21:29,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:21:29,709 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 198 transitions. [2018-12-24 14:21:29,709 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-24 14:21:29,709 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 198 transitions. [2018-12-24 14:21:29,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-12-24 14:21:29,710 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:21:29,710 INFO L402 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1] [2018-12-24 14:21:29,710 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:21:29,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:21:29,711 INFO L82 PathProgramCache]: Analyzing trace with hash 2056396679, now seen corresponding path program 46 times [2018-12-24 14:21:29,711 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:21:29,711 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:21:29,711 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:21:29,711 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:21:29,712 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:21:29,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:21:30,826 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 14:21:30,827 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:21:30,827 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:21:30,827 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:21:30,827 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:21:30,827 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:21:30,827 INFO 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 14:21:30,836 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:21:30,836 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:21:30,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:21:30,877 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:21:34,688 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 14:21:34,689 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:21:35,634 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 14:21:35,653 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:21:35,654 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 85 [2018-12-24 14:21:35,654 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:21:35,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-24 14:21:35,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-24 14:21:35,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2018-12-24 14:21:35,655 INFO L87 Difference]: Start difference. First operand 196 states and 198 transitions. Second operand 86 states. [2018-12-24 14:21:38,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:21:38,231 INFO L93 Difference]: Finished difference Result 420 states and 424 transitions. [2018-12-24 14:21:38,231 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-12-24 14:21:38,231 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 195 [2018-12-24 14:21:38,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:21:38,233 INFO L225 Difference]: With dead ends: 420 [2018-12-24 14:21:38,233 INFO L226 Difference]: Without dead ends: 201 [2018-12-24 14:21:38,234 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 306 SyntacticMatches, 55 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4482 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=2983, Invalid=9899, Unknown=0, NotChecked=0, Total=12882 [2018-12-24 14:21:38,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2018-12-24 14:21:38,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 199. [2018-12-24 14:21:38,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-12-24 14:21:38,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 201 transitions. [2018-12-24 14:21:38,276 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 201 transitions. Word has length 195 [2018-12-24 14:21:38,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:21:38,277 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 201 transitions. [2018-12-24 14:21:38,277 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-24 14:21:38,277 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 201 transitions. [2018-12-24 14:21:38,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2018-12-24 14:21:38,277 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:21:38,278 INFO L402 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 27, 1, 1, 1, 1, 1] [2018-12-24 14:21:38,278 INFO L423 AbstractCegarLoop]: === Iteration 51 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:21:38,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:21:38,278 INFO L82 PathProgramCache]: Analyzing trace with hash -303839985, now seen corresponding path program 47 times [2018-12-24 14:21:38,278 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:21:38,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:21:38,279 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:21:38,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:21:38,279 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:21:38,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:21:40,190 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 14:21:40,191 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:21:40,191 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:21:40,191 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:21:40,191 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:21:40,191 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:21:40,191 INFO 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 14:21:40,201 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:21:40,201 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:21:40,259 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2018-12-24 14:21:40,259 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:21:40,263 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:21:42,254 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 14:21:42,254 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:21:42,438 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 14:21:42,457 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:21:42,457 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 88 [2018-12-24 14:21:42,457 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:21:42,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-24 14:21:42,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-24 14:21:42,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=7598, Unknown=0, NotChecked=0, Total=7832 [2018-12-24 14:21:42,459 INFO L87 Difference]: Start difference. First operand 199 states and 201 transitions. Second operand 89 states. [2018-12-24 14:21:51,297 WARN L181 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2018-12-24 14:21:51,732 WARN L181 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2018-12-24 14:21:52,156 WARN L181 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-12-24 14:21:52,463 WARN L181 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 14:21:52,743 WARN L181 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 14:21:53,025 WARN L181 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 14:21:53,337 WARN L181 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 14:21:53,613 WARN L181 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 14:21:53,860 WARN L181 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 14:21:54,094 WARN L181 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 14:21:54,323 WARN L181 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:21:56,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:21:56,776 INFO L93 Difference]: Finished difference Result 424 states and 429 transitions. [2018-12-24 14:21:56,776 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2018-12-24 14:21:56,777 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 198 [2018-12-24 14:21:56,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:21:56,779 INFO L225 Difference]: With dead ends: 424 [2018-12-24 14:21:56,779 INFO L226 Difference]: Without dead ends: 314 [2018-12-24 14:21:56,780 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 363 SyntacticMatches, 3 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3314 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=1271, Invalid=19609, Unknown=0, NotChecked=0, Total=20880 [2018-12-24 14:21:56,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2018-12-24 14:21:56,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 203. [2018-12-24 14:21:56,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 203 states. [2018-12-24 14:21:56,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 205 transitions. [2018-12-24 14:21:56,835 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 205 transitions. Word has length 198 [2018-12-24 14:21:56,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:21:56,835 INFO L480 AbstractCegarLoop]: Abstraction has 203 states and 205 transitions. [2018-12-24 14:21:56,835 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-24 14:21:56,836 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 205 transitions. [2018-12-24 14:21:56,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2018-12-24 14:21:56,837 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:21:56,837 INFO L402 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 28, 28, 1, 1, 1, 1, 1] [2018-12-24 14:21:56,837 INFO L423 AbstractCegarLoop]: === Iteration 52 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:21:56,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:21:56,837 INFO L82 PathProgramCache]: Analyzing trace with hash -1908736842, now seen corresponding path program 48 times [2018-12-24 14:21:56,837 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:21:56,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:21:56,838 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:21:56,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:21:56,838 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:21:56,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:21:57,998 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 14:21:57,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:21:57,998 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:21:57,998 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:21:57,998 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:21:57,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:21:57,998 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 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 14:21:58,007 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:21:58,007 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:21:58,040 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:21:58,040 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:21:58,043 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:21:59,681 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 14:21:59,682 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:22:00,720 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 14:22:00,740 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:22:00,740 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 88 [2018-12-24 14:22:00,740 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:22:00,740 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-24 14:22:00,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-24 14:22:00,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2018-12-24 14:22:00,741 INFO L87 Difference]: Start difference. First operand 203 states and 205 transitions. Second operand 89 states. [2018-12-24 14:22:03,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:22:03,242 INFO L93 Difference]: Finished difference Result 435 states and 439 transitions. [2018-12-24 14:22:03,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-12-24 14:22:03,242 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 202 [2018-12-24 14:22:03,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:22:03,243 INFO L225 Difference]: With dead ends: 435 [2018-12-24 14:22:03,243 INFO L226 Difference]: Without dead ends: 208 [2018-12-24 14:22:03,245 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 317 SyntacticMatches, 57 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4816 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=3191, Invalid=10615, Unknown=0, NotChecked=0, Total=13806 [2018-12-24 14:22:03,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-12-24 14:22:03,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 206. [2018-12-24 14:22:03,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2018-12-24 14:22:03,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 208 transitions. [2018-12-24 14:22:03,297 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 208 transitions. Word has length 202 [2018-12-24 14:22:03,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:22:03,297 INFO L480 AbstractCegarLoop]: Abstraction has 206 states and 208 transitions. [2018-12-24 14:22:03,297 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-24 14:22:03,297 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 208 transitions. [2018-12-24 14:22:03,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2018-12-24 14:22:03,298 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:22:03,298 INFO L402 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 28, 28, 28, 1, 1, 1, 1, 1] [2018-12-24 14:22:03,299 INFO L423 AbstractCegarLoop]: === Iteration 53 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:22:03,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:22:03,299 INFO L82 PathProgramCache]: Analyzing trace with hash 1062571566, now seen corresponding path program 49 times [2018-12-24 14:22:03,299 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:22:03,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:22:03,300 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:22:03,300 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:22:03,300 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:22:03,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:22:05,463 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 14:22:05,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:22:05,464 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:22:05,464 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:22:05,464 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:22:05,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:22:05,464 INFO 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 14:22:05,475 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:22:05,476 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:22:05,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:22:05,521 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:22:07,736 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 14:22:07,736 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:22:07,930 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 14:22:07,948 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:22:07,949 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 60, 60] total 91 [2018-12-24 14:22:07,949 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:22:07,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-12-24 14:22:07,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-12-24 14:22:07,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=8130, Unknown=0, NotChecked=0, Total=8372 [2018-12-24 14:22:07,950 INFO L87 Difference]: Start difference. First operand 206 states and 208 transitions. Second operand 92 states. [2018-12-24 14:22:17,402 WARN L181 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2018-12-24 14:22:17,868 WARN L181 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2018-12-24 14:22:18,300 WARN L181 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2018-12-24 14:22:18,607 WARN L181 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 14:22:18,968 WARN L181 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 14:22:19,273 WARN L181 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 14:22:19,559 WARN L181 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 14:22:19,840 WARN L181 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 14:22:20,101 WARN L181 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 14:22:20,346 WARN L181 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 14:22:20,589 WARN L181 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 14:22:20,823 WARN L181 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:22:23,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:22:23,350 INFO L93 Difference]: Finished difference Result 439 states and 444 transitions. [2018-12-24 14:22:23,351 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2018-12-24 14:22:23,351 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 205 [2018-12-24 14:22:23,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:22:23,353 INFO L225 Difference]: With dead ends: 439 [2018-12-24 14:22:23,353 INFO L226 Difference]: Without dead ends: 325 [2018-12-24 14:22:23,354 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 527 GetRequests, 376 SyntacticMatches, 3 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3548 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=1345, Invalid=21005, Unknown=0, NotChecked=0, Total=22350 [2018-12-24 14:22:23,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2018-12-24 14:22:23,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 210. [2018-12-24 14:22:23,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-12-24 14:22:23,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 212 transitions. [2018-12-24 14:22:23,408 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 212 transitions. Word has length 205 [2018-12-24 14:22:23,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:22:23,409 INFO L480 AbstractCegarLoop]: Abstraction has 210 states and 212 transitions. [2018-12-24 14:22:23,409 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-12-24 14:22:23,409 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 212 transitions. [2018-12-24 14:22:23,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-12-24 14:22:23,410 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:22:23,410 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1] [2018-12-24 14:22:23,410 INFO L423 AbstractCegarLoop]: === Iteration 54 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:22:23,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:22:23,411 INFO L82 PathProgramCache]: Analyzing trace with hash -782950827, now seen corresponding path program 50 times [2018-12-24 14:22:23,411 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:22:23,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:22:23,412 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:22:23,412 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:22:23,412 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:22:23,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:22:25,371 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 14:22:25,371 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:22:25,371 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:22:25,372 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:22:25,372 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:22:25,372 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:22:25,372 INFO 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 14:22:25,380 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:22:25,380 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:22:25,440 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-12-24 14:22:25,440 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:22:25,444 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:22:27,027 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 14:22:27,027 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:22:28,181 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 14:22:28,202 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:22:28,203 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 91 [2018-12-24 14:22:28,203 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:22:28,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-12-24 14:22:28,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-12-24 14:22:28,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2018-12-24 14:22:28,204 INFO L87 Difference]: Start difference. First operand 210 states and 212 transitions. Second operand 92 states. [2018-12-24 14:22:31,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:22:31,100 INFO L93 Difference]: Finished difference Result 450 states and 454 transitions. [2018-12-24 14:22:31,101 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-12-24 14:22:31,101 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 209 [2018-12-24 14:22:31,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:22:31,102 INFO L225 Difference]: With dead ends: 450 [2018-12-24 14:22:31,102 INFO L226 Difference]: Without dead ends: 215 [2018-12-24 14:22:31,103 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 14:22:31,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2018-12-24 14:22:31,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 213. [2018-12-24 14:22:31,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-12-24 14:22:31,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 215 transitions. [2018-12-24 14:22:31,175 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 215 transitions. Word has length 209 [2018-12-24 14:22:31,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:22:31,175 INFO L480 AbstractCegarLoop]: Abstraction has 213 states and 215 transitions. [2018-12-24 14:22:31,175 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-12-24 14:22:31,175 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 215 transitions. [2018-12-24 14:22:31,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-12-24 14:22:31,176 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:22:31,176 INFO L402 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 29, 29, 29, 1, 1, 1, 1, 1] [2018-12-24 14:22:31,177 INFO L423 AbstractCegarLoop]: === Iteration 55 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:22:31,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:22:31,177 INFO L82 PathProgramCache]: Analyzing trace with hash -890079779, now seen corresponding path program 51 times [2018-12-24 14:22:31,177 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:22:31,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:22:31,178 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:22:31,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:22:31,178 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:22:31,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:22:33,348 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 14:22:33,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:22:33,348 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:22:33,348 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:22:33,348 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:22:33,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:22:33,348 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:22:33,361 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:22:33,361 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:22:33,402 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:22:33,402 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:22:33,408 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:22:36,368 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 14:22:36,368 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:22:36,606 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 14:22:36,624 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:22:36,625 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 94 [2018-12-24 14:22:36,625 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:22:36,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-24 14:22:36,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-24 14:22:36,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=8680, Unknown=0, NotChecked=0, Total=8930 [2018-12-24 14:22:36,626 INFO L87 Difference]: Start difference. First operand 213 states and 215 transitions. Second operand 95 states. [2018-12-24 14:22:47,168 WARN L181 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 153 [2018-12-24 14:22:47,642 WARN L181 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 153 [2018-12-24 14:22:48,106 WARN L181 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2018-12-24 14:22:48,436 WARN L181 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 14:22:48,751 WARN L181 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 14:22:49,066 WARN L181 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 14:22:49,369 WARN L181 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 14:22:49,713 WARN L181 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 14:22:50,008 WARN L181 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 14:22:50,274 WARN L181 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 14:22:50,529 WARN L181 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 14:22:50,773 WARN L181 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 14:22:51,020 WARN L181 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:22:53,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:22:53,612 INFO L93 Difference]: Finished difference Result 454 states and 459 transitions. [2018-12-24 14:22:53,612 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2018-12-24 14:22:53,613 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 212 [2018-12-24 14:22:53,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:22:53,615 INFO L225 Difference]: With dead ends: 454 [2018-12-24 14:22:53,615 INFO L226 Difference]: Without dead ends: 336 [2018-12-24 14:22:53,616 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 545 GetRequests, 389 SyntacticMatches, 3 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3790 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=1421, Invalid=22449, Unknown=0, NotChecked=0, Total=23870 [2018-12-24 14:22:53,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2018-12-24 14:22:53,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 217. [2018-12-24 14:22:53,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2018-12-24 14:22:53,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 219 transitions. [2018-12-24 14:22:53,674 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 219 transitions. Word has length 212 [2018-12-24 14:22:53,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:22:53,674 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 219 transitions. [2018-12-24 14:22:53,675 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-24 14:22:53,675 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 219 transitions. [2018-12-24 14:22:53,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2018-12-24 14:22:53,675 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:22:53,676 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 30, 30, 1, 1, 1, 1, 1] [2018-12-24 14:22:53,676 INFO L423 AbstractCegarLoop]: === Iteration 56 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:22:53,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:22:53,676 INFO L82 PathProgramCache]: Analyzing trace with hash -272066940, now seen corresponding path program 52 times [2018-12-24 14:22:53,676 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:22:53,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:22:53,677 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:22:53,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:22:53,677 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:22:53,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:22:55,211 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 14:22:55,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:22:55,212 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:22:55,212 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:22:55,212 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:22:55,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:22:55,212 INFO 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 14:22:55,223 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:22:55,223 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:22:55,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:22:55,265 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:22:56,839 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 14:22:56,840 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:22:58,009 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 14:22:58,028 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:22:58,029 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 94 [2018-12-24 14:22:58,029 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:22:58,029 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-24 14:22:58,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-24 14:22:58,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2018-12-24 14:22:58,030 INFO L87 Difference]: Start difference. First operand 217 states and 219 transitions. Second operand 95 states. [2018-12-24 14:23:01,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:23:01,154 INFO L93 Difference]: Finished difference Result 465 states and 469 transitions. [2018-12-24 14:23:01,154 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-12-24 14:23:01,154 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 216 [2018-12-24 14:23:01,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:23:01,156 INFO L225 Difference]: With dead ends: 465 [2018-12-24 14:23:01,156 INFO L226 Difference]: Without dead ends: 222 [2018-12-24 14:23:01,157 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 524 GetRequests, 339 SyntacticMatches, 61 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5520 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=3628, Invalid=12122, Unknown=0, NotChecked=0, Total=15750 [2018-12-24 14:23:01,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-12-24 14:23:01,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 220. [2018-12-24 14:23:01,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2018-12-24 14:23:01,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 222 transitions. [2018-12-24 14:23:01,209 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 222 transitions. Word has length 216 [2018-12-24 14:23:01,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:23:01,209 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 222 transitions. [2018-12-24 14:23:01,209 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-24 14:23:01,209 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 222 transitions. [2018-12-24 14:23:01,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-12-24 14:23:01,210 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:23:01,210 INFO L402 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 30, 30, 30, 1, 1, 1, 1, 1] [2018-12-24 14:23:01,210 INFO L423 AbstractCegarLoop]: === Iteration 57 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:23:01,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:23:01,210 INFO L82 PathProgramCache]: Analyzing trace with hash 292238844, now seen corresponding path program 53 times [2018-12-24 14:23:01,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:23:01,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:23:01,211 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:23:01,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:23:01,211 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:23:01,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:23:03,505 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 14:23:03,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:23:03,506 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:23:03,506 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:23:03,506 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:23:03,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:23:03,506 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 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 14:23:03,516 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:23:03,516 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:23:03,581 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-12-24 14:23:03,581 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:23:03,585 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:23:09,874 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 14:23:09,874 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:23:15,839 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 14:23:15,858 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:23:15,858 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 66, 66] total 163 [2018-12-24 14:23:15,858 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:23:15,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2018-12-24 14:23:15,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2018-12-24 14:23:15,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2878, Invalid=23854, Unknown=0, NotChecked=0, Total=26732 [2018-12-24 14:23:15,860 INFO L87 Difference]: Start difference. First operand 220 states and 222 transitions. Second operand 131 states. [2018-12-24 14:23:40,788 WARN L181 SmtUtils]: Spent 239.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2018-12-24 14:23:41,430 WARN L181 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2018-12-24 14:23:42,062 WARN L181 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 153 [2018-12-24 14:23:42,588 WARN L181 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-24 14:23:43,094 WARN L181 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 14:23:43,584 WARN L181 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 14:23:44,056 WARN L181 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 14:23:44,513 WARN L181 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 14:23:44,971 WARN L181 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 14:23:45,412 WARN L181 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 14:23:45,859 WARN L181 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 14:23:46,296 WARN L181 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 14:23:46,671 WARN L181 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 14:23:47,034 WARN L181 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:23:50,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:23:50,705 INFO L93 Difference]: Finished difference Result 591 states and 597 transitions. [2018-12-24 14:23:50,705 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 219 states. [2018-12-24 14:23:50,705 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 219 [2018-12-24 14:23:50,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:23:50,707 INFO L225 Difference]: With dead ends: 591 [2018-12-24 14:23:50,708 INFO L226 Difference]: Without dead ends: 344 [2018-12-24 14:23:50,711 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 687 GetRequests, 307 SyntacticMatches, 32 SemanticMatches, 348 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26556 ImplicationChecksByTransitivity, 39.8s TimeCoverageRelationStatistics Valid=8585, Invalid=113565, Unknown=0, NotChecked=0, Total=122150 [2018-12-24 14:23:50,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2018-12-24 14:23:50,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 227. [2018-12-24 14:23:50,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 227 states. [2018-12-24 14:23:50,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 229 transitions. [2018-12-24 14:23:50,765 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 229 transitions. Word has length 219 [2018-12-24 14:23:50,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:23:50,765 INFO L480 AbstractCegarLoop]: Abstraction has 227 states and 229 transitions. [2018-12-24 14:23:50,765 INFO L481 AbstractCegarLoop]: Interpolant automaton has 131 states. [2018-12-24 14:23:50,765 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 229 transitions. [2018-12-24 14:23:50,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2018-12-24 14:23:50,766 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:23:50,766 INFO L402 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 31, 31, 31, 1, 1, 1, 1, 1] [2018-12-24 14:23:50,767 INFO L423 AbstractCegarLoop]: === Iteration 58 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:23:50,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:23:50,767 INFO L82 PathProgramCache]: Analyzing trace with hash 2116008107, now seen corresponding path program 54 times [2018-12-24 14:23:50,767 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:23:50,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:23:50,767 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:23:50,768 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:23:50,768 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:23:50,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:23:53,381 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 14:23:53,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:23:53,381 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:23:53,381 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:23:53,381 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:23:53,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:23:53,382 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:23:53,391 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:23:53,391 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:23:53,428 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:23:53,428 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:23:53,432 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:23:56,007 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 14:23:56,007 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:23:56,350 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 14:23:56,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:23:56,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66, 66] total 100 [2018-12-24 14:23:56,372 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:23:56,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-24 14:23:56,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-24 14:23:56,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=9834, Unknown=0, NotChecked=0, Total=10100 [2018-12-24 14:23:56,373 INFO L87 Difference]: Start difference. First operand 227 states and 229 transitions. Second operand 101 states. [2018-12-24 14:24:09,594 WARN L181 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 163 [2018-12-24 14:24:10,112 WARN L181 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 163 [2018-12-24 14:24:10,616 WARN L181 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2018-12-24 14:24:10,959 WARN L181 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-24 14:24:11,312 WARN L181 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-24 14:24:11,745 WARN L181 SmtUtils]: Spent 240.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 14:24:12,085 WARN L181 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 14:24:12,397 WARN L181 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 14:24:12,710 WARN L181 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 14:24:13,013 WARN L181 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 14:24:13,314 WARN L181 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 14:24:13,598 WARN L181 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 14:24:13,863 WARN L181 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 14:24:14,127 WARN L181 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 14:24:14,395 WARN L181 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:24:17,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:24:17,298 INFO L93 Difference]: Finished difference Result 484 states and 489 transitions. [2018-12-24 14:24:17,298 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2018-12-24 14:24:17,298 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 226 [2018-12-24 14:24:17,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:24:17,300 INFO L225 Difference]: With dead ends: 484 [2018-12-24 14:24:17,300 INFO L226 Difference]: Without dead ends: 358 [2018-12-24 14:24:17,301 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 581 GetRequests, 415 SyntacticMatches, 3 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4298 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=1579, Invalid=25481, Unknown=0, NotChecked=0, Total=27060 [2018-12-24 14:24:17,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2018-12-24 14:24:17,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 231. [2018-12-24 14:24:17,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 231 states. [2018-12-24 14:24:17,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 233 transitions. [2018-12-24 14:24:17,362 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 233 transitions. Word has length 226 [2018-12-24 14:24:17,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:24:17,362 INFO L480 AbstractCegarLoop]: Abstraction has 231 states and 233 transitions. [2018-12-24 14:24:17,362 INFO L481 AbstractCegarLoop]: Interpolant automaton has 101 states. [2018-12-24 14:24:17,362 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 233 transitions. [2018-12-24 14:24:17,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2018-12-24 14:24:17,363 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:24:17,363 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 32, 32, 1, 1, 1, 1, 1] [2018-12-24 14:24:17,364 INFO L423 AbstractCegarLoop]: === Iteration 59 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:24:17,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:24:17,364 INFO L82 PathProgramCache]: Analyzing trace with hash -237256110, now seen corresponding path program 55 times [2018-12-24 14:24:17,364 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:24:17,365 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:24:17,365 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:24:17,365 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:24:17,365 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:24:17,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:24:18,923 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 14:24:18,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:24:18,924 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:24:18,924 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:24:18,924 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:24:18,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:24:18,924 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:24:18,934 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:24:18,934 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:24:18,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:24:18,983 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:24:20,711 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 14:24:20,711 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:24:22,652 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 14:24:22,671 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:24:22,671 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 100 [2018-12-24 14:24:22,671 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:24:22,671 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-24 14:24:22,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-24 14:24:22,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2018-12-24 14:24:22,672 INFO L87 Difference]: Start difference. First operand 231 states and 233 transitions. Second operand 101 states. [2018-12-24 14:24:25,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:24:25,073 INFO L93 Difference]: Finished difference Result 495 states and 499 transitions. [2018-12-24 14:24:25,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-12-24 14:24:25,073 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 230 [2018-12-24 14:24:25,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:24:25,074 INFO L225 Difference]: With dead ends: 495 [2018-12-24 14:24:25,074 INFO L226 Difference]: Without dead ends: 236 [2018-12-24 14:24:25,075 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 558 GetRequests, 361 SyntacticMatches, 65 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6272 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2018-12-24 14:24:25,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2018-12-24 14:24:25,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 234. [2018-12-24 14:24:25,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2018-12-24 14:24:25,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 236 transitions. [2018-12-24 14:24:25,133 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 236 transitions. Word has length 230 [2018-12-24 14:24:25,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:24:25,134 INFO L480 AbstractCegarLoop]: Abstraction has 234 states and 236 transitions. [2018-12-24 14:24:25,134 INFO L481 AbstractCegarLoop]: Interpolant automaton has 101 states. [2018-12-24 14:24:25,134 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 236 transitions. [2018-12-24 14:24:25,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2018-12-24 14:24:25,135 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:24:25,135 INFO L402 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 32, 32, 32, 1, 1, 1, 1, 1] [2018-12-24 14:24:25,135 INFO L423 AbstractCegarLoop]: === Iteration 60 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:24:25,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:24:25,136 INFO L82 PathProgramCache]: Analyzing trace with hash -170528822, now seen corresponding path program 56 times [2018-12-24 14:24:25,136 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:24:25,136 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:24:25,137 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:24:25,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:24:25,137 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:24:25,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:24:27,965 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 14:24:27,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:24:27,965 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:24:27,965 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:24:27,965 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:24:27,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:24:27,965 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:24:27,973 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:24:27,974 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:24:28,052 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-12-24 14:24:28,052 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:24:28,057 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:24:34,886 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 14:24:34,886 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:24:41,353 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 14:24:41,372 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:24:41,373 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 70, 70] total 173 [2018-12-24 14:24:41,373 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:24:41,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 139 states [2018-12-24 14:24:41,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2018-12-24 14:24:41,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3227, Invalid=26875, Unknown=0, NotChecked=0, Total=30102 [2018-12-24 14:24:41,375 INFO L87 Difference]: Start difference. First operand 234 states and 236 transitions. Second operand 139 states. [2018-12-24 14:25:07,610 WARN L181 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 168 [2018-12-24 14:25:08,284 WARN L181 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 168 [2018-12-24 14:25:08,932 WARN L181 SmtUtils]: Spent 219.00 ms on a formula simplification that was a NOOP. DAG size: 163 [2018-12-24 14:25:09,504 WARN L181 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-24 14:25:10,063 WARN L181 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-24 14:25:10,600 WARN L181 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-24 14:25:11,114 WARN L181 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 14:25:11,625 WARN L181 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 14:25:12,120 WARN L181 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 14:25:12,620 WARN L181 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 14:25:13,165 WARN L181 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 14:25:13,626 WARN L181 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 14:25:14,063 WARN L181 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 14:25:14,477 WARN L181 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 14:25:14,886 WARN L181 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 14:25:15,267 WARN L181 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:25:19,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:25:19,312 INFO L93 Difference]: Finished difference Result 629 states and 635 transitions. [2018-12-24 14:25:19,312 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 233 states. [2018-12-24 14:25:19,313 INFO L78 Accepts]: Start accepts. Automaton has 139 states. Word has length 233 [2018-12-24 14:25:19,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:25:19,315 INFO L225 Difference]: With dead ends: 629 [2018-12-24 14:25:19,315 INFO L226 Difference]: Without dead ends: 366 [2018-12-24 14:25:19,318 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 731 GetRequests, 327 SyntacticMatches, 34 SemanticMatches, 370 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30017 ImplicationChecksByTransitivity, 45.0s TimeCoverageRelationStatistics Valid=9599, Invalid=128413, Unknown=0, NotChecked=0, Total=138012 [2018-12-24 14:25:19,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2018-12-24 14:25:19,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 241. [2018-12-24 14:25:19,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2018-12-24 14:25:19,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 243 transitions. [2018-12-24 14:25:19,382 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 243 transitions. Word has length 233 [2018-12-24 14:25:19,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:25:19,382 INFO L480 AbstractCegarLoop]: Abstraction has 241 states and 243 transitions. [2018-12-24 14:25:19,382 INFO L481 AbstractCegarLoop]: Interpolant automaton has 139 states. [2018-12-24 14:25:19,382 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 243 transitions. [2018-12-24 14:25:19,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2018-12-24 14:25:19,383 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:25:19,383 INFO L402 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 33, 33, 33, 1, 1, 1, 1, 1] [2018-12-24 14:25:19,383 INFO L423 AbstractCegarLoop]: === Iteration 61 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:25:19,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:25:19,384 INFO L82 PathProgramCache]: Analyzing trace with hash 1552518521, now seen corresponding path program 57 times [2018-12-24 14:25:19,384 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:25:19,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:25:19,384 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:25:19,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:25:19,384 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:25:19,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:25:22,101 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 14:25:22,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:25:22,102 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:25:22,102 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:25:22,102 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:25:22,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:25:22,102 INFO 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 14:25:22,114 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:25:22,115 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:25:22,156 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:25:22,157 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:25:22,161 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:25:25,373 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 14:25:25,374 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:25:25,618 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 14:25:25,650 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:25:25,650 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70, 70] total 106 [2018-12-24 14:25:25,650 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:25:25,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-12-24 14:25:25,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-12-24 14:25:25,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=11060, Unknown=0, NotChecked=0, Total=11342 [2018-12-24 14:25:25,651 INFO L87 Difference]: Start difference. First operand 241 states and 243 transitions. Second operand 107 states. [2018-12-24 14:25:38,044 WARN L181 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 173 [2018-12-24 14:25:38,682 WARN L181 SmtUtils]: Spent 302.00 ms on a formula simplification that was a NOOP. DAG size: 173 [2018-12-24 14:25:39,243 WARN L181 SmtUtils]: Spent 224.00 ms on a formula simplification that was a NOOP. DAG size: 168 [2018-12-24 14:25:39,639 WARN L181 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-24 14:25:40,027 WARN L181 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-24 14:25:40,411 WARN L181 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-24 14:25:40,789 WARN L181 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-24 14:25:41,135 WARN L181 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 14:25:41,475 WARN L181 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 14:25:41,811 WARN L181 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 14:25:42,152 WARN L181 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 14:25:42,471 WARN L181 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 14:25:42,788 WARN L181 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 14:25:43,087 WARN L181 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 14:25:43,376 WARN L181 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 14:25:43,691 WARN L181 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 14:25:44,010 WARN L181 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:25:44,296 WARN L181 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-24 14:25:46,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:25:46,922 INFO L93 Difference]: Finished difference Result 514 states and 519 transitions. [2018-12-24 14:25:46,922 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2018-12-24 14:25:46,922 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 240 [2018-12-24 14:25:46,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:25:46,924 INFO L225 Difference]: With dead ends: 514 [2018-12-24 14:25:46,924 INFO L226 Difference]: Without dead ends: 380 [2018-12-24 14:25:46,926 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 617 GetRequests, 441 SyntacticMatches, 3 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4838 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=1745, Invalid=28705, Unknown=0, NotChecked=0, Total=30450 [2018-12-24 14:25:46,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2018-12-24 14:25:46,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 245. [2018-12-24 14:25:46,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245 states. [2018-12-24 14:25:46,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 247 transitions. [2018-12-24 14:25:46,992 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 247 transitions. Word has length 240 [2018-12-24 14:25:46,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:25:46,992 INFO L480 AbstractCegarLoop]: Abstraction has 245 states and 247 transitions. [2018-12-24 14:25:46,992 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-12-24 14:25:46,992 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 247 transitions. [2018-12-24 14:25:46,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2018-12-24 14:25:46,993 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:25:46,993 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 34, 34, 1, 1, 1, 1, 1] [2018-12-24 14:25:46,994 INFO L423 AbstractCegarLoop]: === Iteration 62 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:25:46,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:25:46,994 INFO L82 PathProgramCache]: Analyzing trace with hash 714244128, now seen corresponding path program 58 times [2018-12-24 14:25:46,994 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:25:46,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:25:46,995 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:25:46,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:25:46,995 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:25:47,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:25:48,638 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 14:25:48,638 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:25:48,638 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:25:48,638 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:25:48,638 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:25:48,638 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:25:48,638 INFO 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 14:25:48,649 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:25:48,650 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:25:48,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:25:48,699 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:25:50,958 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 14:25:50,959 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:25:52,470 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 14:25:52,489 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:25:52,489 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 106 [2018-12-24 14:25:52,489 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:25:52,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-12-24 14:25:52,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-12-24 14:25:52,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2018-12-24 14:25:52,490 INFO L87 Difference]: Start difference. First operand 245 states and 247 transitions. Second operand 107 states. [2018-12-24 14:25:55,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:25:55,314 INFO L93 Difference]: Finished difference Result 525 states and 529 transitions. [2018-12-24 14:25:55,315 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-24 14:25:55,315 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 244 [2018-12-24 14:25:55,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:25:55,316 INFO L225 Difference]: With dead ends: 525 [2018-12-24 14:25:55,316 INFO L226 Difference]: Without dead ends: 250 [2018-12-24 14:25:55,317 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 383 SyntacticMatches, 69 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7072 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=4586, Invalid=15436, Unknown=0, NotChecked=0, Total=20022 [2018-12-24 14:25:55,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2018-12-24 14:25:55,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 248. [2018-12-24 14:25:55,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2018-12-24 14:25:55,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 250 transitions. [2018-12-24 14:25:55,389 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 250 transitions. Word has length 244 [2018-12-24 14:25:55,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:25:55,390 INFO L480 AbstractCegarLoop]: Abstraction has 248 states and 250 transitions. [2018-12-24 14:25:55,390 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-12-24 14:25:55,390 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 250 transitions. [2018-12-24 14:25:55,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2018-12-24 14:25:55,391 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:25:55,391 INFO L402 BasicCegarLoop]: trace histogram [35, 35, 35, 35, 34, 34, 34, 1, 1, 1, 1, 1] [2018-12-24 14:25:55,391 INFO L423 AbstractCegarLoop]: === Iteration 63 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:25:55,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:25:55,392 INFO L82 PathProgramCache]: Analyzing trace with hash 1637071768, now seen corresponding path program 59 times [2018-12-24 14:25:55,392 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:25:55,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:25:55,393 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:25:55,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:25:55,393 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:25:55,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:25:58,268 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 14:25:58,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:25:58,269 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:25:58,269 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:25:58,269 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:25:58,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:25:58,269 INFO 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 14:25:58,278 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:25:58,279 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:25:58,353 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-12-24 14:25:58,353 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:25:58,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:26:06,335 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 14:26:06,335 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:26:13,389 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 14:26:13,419 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:26:13,419 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 74, 74] total 183 [2018-12-24 14:26:13,419 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:26:13,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 147 states [2018-12-24 14:26:13,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2018-12-24 14:26:13,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3596, Invalid=30076, Unknown=0, NotChecked=0, Total=33672 [2018-12-24 14:26:13,422 INFO L87 Difference]: Start difference. First operand 248 states and 250 transitions. Second operand 147 states. [2018-12-24 14:26:42,035 WARN L181 SmtUtils]: Spent 247.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2018-12-24 14:26:42,718 WARN L181 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2018-12-24 14:26:43,392 WARN L181 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 173 [2018-12-24 14:26:44,064 WARN L181 SmtUtils]: Spent 227.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-24 14:26:44,686 WARN L181 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-24 14:26:45,349 WARN L181 SmtUtils]: Spent 257.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-24 14:26:45,939 WARN L181 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-24 14:26:46,513 WARN L181 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-24 14:26:47,078 WARN L181 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 14:26:47,608 WARN L181 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 14:26:48,124 WARN L181 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 14:26:48,628 WARN L181 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 14:26:49,148 WARN L181 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 14:26:49,618 WARN L181 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 14:26:50,077 WARN L181 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 14:26:50,575 WARN L181 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 14:26:50,991 WARN L181 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 14:26:51,393 WARN L181 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:26:55,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:26:55,712 INFO L93 Difference]: Finished difference Result 667 states and 673 transitions. [2018-12-24 14:26:55,712 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 247 states. [2018-12-24 14:26:55,713 INFO L78 Accepts]: Start accepts. Automaton has 147 states. Word has length 247 [2018-12-24 14:26:55,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:26:55,715 INFO L225 Difference]: With dead ends: 667 [2018-12-24 14:26:55,715 INFO L226 Difference]: Without dead ends: 388 [2018-12-24 14:26:55,719 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 775 GetRequests, 347 SyntacticMatches, 36 SemanticMatches, 392 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33690 ImplicationChecksByTransitivity, 50.5s TimeCoverageRelationStatistics Valid=10669, Invalid=144173, Unknown=0, NotChecked=0, Total=154842 [2018-12-24 14:26:55,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 388 states. [2018-12-24 14:26:55,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 388 to 255. [2018-12-24 14:26:55,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 255 states. [2018-12-24 14:26:55,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 257 transitions. [2018-12-24 14:26:55,793 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 257 transitions. Word has length 247 [2018-12-24 14:26:55,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:26:55,793 INFO L480 AbstractCegarLoop]: Abstraction has 255 states and 257 transitions. [2018-12-24 14:26:55,793 INFO L481 AbstractCegarLoop]: Interpolant automaton has 147 states. [2018-12-24 14:26:55,793 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 257 transitions. [2018-12-24 14:26:55,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2018-12-24 14:26:55,794 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:26:55,794 INFO L402 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 35, 35, 35, 1, 1, 1, 1, 1] [2018-12-24 14:26:55,794 INFO L423 AbstractCegarLoop]: === Iteration 64 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:26:55,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:26:55,795 INFO L82 PathProgramCache]: Analyzing trace with hash -783420345, now seen corresponding path program 60 times [2018-12-24 14:26:55,795 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:26:55,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:26:55,796 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:26:55,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:26:55,796 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:26:55,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:26:58,771 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 14:26:58,772 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:26:58,772 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:26:58,772 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:26:58,772 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:26:58,772 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:26:58,772 INFO 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 14:26:58,782 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:26:58,782 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:26:58,825 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:26:58,825 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:26:58,831 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:27:02,177 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 14:27:02,177 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:27:02,497 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 14:27:02,516 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:27:02,516 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 74, 74] total 112 [2018-12-24 14:27:02,516 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:27:02,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2018-12-24 14:27:02,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2018-12-24 14:27:02,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=12358, Unknown=0, NotChecked=0, Total=12656 [2018-12-24 14:27:02,518 INFO L87 Difference]: Start difference. First operand 255 states and 257 transitions. Second operand 113 states. [2018-12-24 14:27:17,069 WARN L181 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 183 [2018-12-24 14:27:17,691 WARN L181 SmtUtils]: Spent 251.00 ms on a formula simplification that was a NOOP. DAG size: 183 [2018-12-24 14:27:18,292 WARN L181 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2018-12-24 14:27:18,714 WARN L181 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2018-12-24 14:27:19,140 WARN L181 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-24 14:27:19,549 WARN L181 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-24 14:27:19,952 WARN L181 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-24 14:27:20,343 WARN L181 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-24 14:27:20,710 WARN L181 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-24 14:27:21,143 WARN L181 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 14:27:21,507 WARN L181 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 14:27:21,862 WARN L181 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 14:27:22,205 WARN L181 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 14:27:22,536 WARN L181 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 14:27:22,859 WARN L181 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 14:27:23,179 WARN L181 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 14:27:23,475 WARN L181 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 14:27:23,761 WARN L181 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 14:27:24,043 WARN L181 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:27:27,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:27:27,227 INFO L93 Difference]: Finished difference Result 544 states and 549 transitions. [2018-12-24 14:27:27,227 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2018-12-24 14:27:27,227 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 254 [2018-12-24 14:27:27,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:27:27,228 INFO L225 Difference]: With dead ends: 544 [2018-12-24 14:27:27,228 INFO L226 Difference]: Without dead ends: 402 [2018-12-24 14:27:27,230 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 653 GetRequests, 467 SyntacticMatches, 3 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5410 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=1919, Invalid=32121, Unknown=0, NotChecked=0, Total=34040 [2018-12-24 14:27:27,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2018-12-24 14:27:27,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 259. [2018-12-24 14:27:27,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-12-24 14:27:27,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 261 transitions. [2018-12-24 14:27:27,297 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 261 transitions. Word has length 254 [2018-12-24 14:27:27,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:27:27,298 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 261 transitions. [2018-12-24 14:27:27,298 INFO L481 AbstractCegarLoop]: Interpolant automaton has 113 states. [2018-12-24 14:27:27,298 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 261 transitions. [2018-12-24 14:27:27,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-12-24 14:27:27,299 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:27:27,300 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 36, 36, 1, 1, 1, 1, 1] [2018-12-24 14:27:27,300 INFO L423 AbstractCegarLoop]: === Iteration 65 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:27:27,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:27:27,300 INFO L82 PathProgramCache]: Analyzing trace with hash 1175113710, now seen corresponding path program 61 times [2018-12-24 14:27:27,300 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:27:27,301 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:27:27,301 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:27:27,301 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:27:27,301 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:27:27,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:27:29,032 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 14:27:29,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:27:29,033 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:27:29,033 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:27:29,033 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:27:29,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:27:29,033 INFO 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 14:27:29,043 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:27:29,043 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 14:27:29,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:27:29,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:27:31,525 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 14:27:31,526 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:27:33,251 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 14:27:33,271 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:27:33,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 112 [2018-12-24 14:27:33,271 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:27:33,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2018-12-24 14:27:33,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2018-12-24 14:27:33,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2018-12-24 14:27:33,272 INFO L87 Difference]: Start difference. First operand 259 states and 261 transitions. Second operand 113 states. [2018-12-24 14:27:36,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:27:36,366 INFO L93 Difference]: Finished difference Result 555 states and 559 transitions. [2018-12-24 14:27:36,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-12-24 14:27:36,366 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 258 [2018-12-24 14:27:36,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:27:36,367 INFO L225 Difference]: With dead ends: 555 [2018-12-24 14:27:36,368 INFO L226 Difference]: Without dead ends: 264 [2018-12-24 14:27:36,369 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 626 GetRequests, 405 SyntacticMatches, 73 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7920 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=5107, Invalid=17243, Unknown=0, NotChecked=0, Total=22350 [2018-12-24 14:27:36,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2018-12-24 14:27:36,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 262. [2018-12-24 14:27:36,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2018-12-24 14:27:36,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 264 transitions. [2018-12-24 14:27:36,434 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 264 transitions. Word has length 258 [2018-12-24 14:27:36,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:27:36,434 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 264 transitions. [2018-12-24 14:27:36,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has 113 states. [2018-12-24 14:27:36,435 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 264 transitions. [2018-12-24 14:27:36,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2018-12-24 14:27:36,436 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:27:36,436 INFO L402 BasicCegarLoop]: trace histogram [37, 37, 37, 37, 36, 36, 36, 1, 1, 1, 1, 1] [2018-12-24 14:27:36,436 INFO L423 AbstractCegarLoop]: === Iteration 66 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:27:36,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:27:36,436 INFO L82 PathProgramCache]: Analyzing trace with hash 1470273894, now seen corresponding path program 62 times [2018-12-24 14:27:36,436 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:27:36,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:27:36,437 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 14:27:36,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:27:36,437 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:27:36,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:27:39,707 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 14:27:39,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:27:39,707 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:27:39,707 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:27:39,707 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:27:39,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:27:39,708 INFO 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 14:27:39,718 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:27:39,719 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:27:39,837 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-12-24 14:27:39,837 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:27:39,842 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:27:48,418 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 14:27:48,419 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:27:56,411 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 14:27:56,430 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:27:56,431 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 78, 78] total 193 [2018-12-24 14:27:56,431 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:27:56,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 155 states [2018-12-24 14:27:56,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2018-12-24 14:27:56,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3985, Invalid=33457, Unknown=0, NotChecked=0, Total=37442 [2018-12-24 14:27:56,433 INFO L87 Difference]: Start difference. First operand 262 states and 264 transitions. Second operand 155 states. [2018-12-24 14:28:28,769 WARN L181 SmtUtils]: Spent 256.00 ms on a formula simplification that was a NOOP. DAG size: 188 [2018-12-24 14:28:29,557 WARN L181 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 188 [2018-12-24 14:28:30,358 WARN L181 SmtUtils]: Spent 256.00 ms on a formula simplification that was a NOOP. DAG size: 183 [2018-12-24 14:28:31,062 WARN L181 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 179 [2018-12-24 14:28:31,769 WARN L181 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2018-12-24 14:28:32,452 WARN L181 SmtUtils]: Spent 226.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-24 14:28:33,136 WARN L181 SmtUtils]: Spent 215.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-24 14:28:33,787 WARN L181 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-24 14:28:34,413 WARN L181 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-24 14:28:35,026 WARN L181 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-24 14:28:35,632 WARN L181 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 14:28:36,195 WARN L181 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 14:28:36,728 WARN L181 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 14:28:37,252 WARN L181 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 14:28:37,839 WARN L181 SmtUtils]: Spent 218.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 14:28:38,364 WARN L181 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 14:28:38,839 WARN L181 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 14:28:39,295 WARN L181 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 14:28:39,731 WARN L181 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 14:28:40,173 WARN L181 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:28:40,559 WARN L181 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-24 14:28:44,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 14:28:44,647 INFO L93 Difference]: Finished difference Result 705 states and 711 transitions. [2018-12-24 14:28:44,647 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 261 states. [2018-12-24 14:28:44,648 INFO L78 Accepts]: Start accepts. Automaton has 155 states. Word has length 261 [2018-12-24 14:28:44,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 14:28:44,649 INFO L225 Difference]: With dead ends: 705 [2018-12-24 14:28:44,649 INFO L226 Difference]: Without dead ends: 410 [2018-12-24 14:28:44,654 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 819 GetRequests, 367 SyntacticMatches, 38 SemanticMatches, 414 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37575 ImplicationChecksByTransitivity, 56.6s TimeCoverageRelationStatistics Valid=11795, Invalid=160845, Unknown=0, NotChecked=0, Total=172640 [2018-12-24 14:28:44,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2018-12-24 14:28:44,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 269. [2018-12-24 14:28:44,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2018-12-24 14:28:44,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 271 transitions. [2018-12-24 14:28:44,737 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 271 transitions. Word has length 261 [2018-12-24 14:28:44,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 14:28:44,738 INFO L480 AbstractCegarLoop]: Abstraction has 269 states and 271 transitions. [2018-12-24 14:28:44,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has 155 states. [2018-12-24 14:28:44,738 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 271 transitions. [2018-12-24 14:28:44,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2018-12-24 14:28:44,739 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 14:28:44,739 INFO L402 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 37, 37, 37, 1, 1, 1, 1, 1] [2018-12-24 14:28:44,739 INFO L423 AbstractCegarLoop]: === Iteration 67 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 14:28:44,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 14:28:44,740 INFO L82 PathProgramCache]: Analyzing trace with hash 1569385749, now seen corresponding path program 63 times [2018-12-24 14:28:44,740 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 14:28:44,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:28:44,741 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 14:28:44,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 14:28:44,741 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 14:28:44,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:28:48,204 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 14:28:48,204 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:28:48,204 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:28:48,204 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:28:48,205 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:28:48,205 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:28:48,205 INFO 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 14:28:48,214 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 14:28:48,214 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 14:28:48,256 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 14:28:48,256 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:28:48,261 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 14:28:51,832 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 14:28:51,832 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 14:28:52,119 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 14:28:52,138 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 14:28:52,139 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 78, 78] total 118 [2018-12-24 14:28:52,139 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 14:28:52,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2018-12-24 14:28:52,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2018-12-24 14:28:52,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=13728, Unknown=0, NotChecked=0, Total=14042 [2018-12-24 14:28:52,140 INFO L87 Difference]: Start difference. First operand 269 states and 271 transitions. Second operand 119 states. [2018-12-24 14:29:09,617 WARN L181 SmtUtils]: Spent 271.00 ms on a formula simplification that was a NOOP. DAG size: 193 [2018-12-24 14:29:10,281 WARN L181 SmtUtils]: Spent 268.00 ms on a formula simplification that was a NOOP. DAG size: 193 [2018-12-24 14:29:10,970 WARN L181 SmtUtils]: Spent 290.00 ms on a formula simplification that was a NOOP. DAG size: 188 [2018-12-24 14:29:11,459 WARN L181 SmtUtils]: Spent 265.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2018-12-24 14:29:11,940 WARN L181 SmtUtils]: Spent 252.00 ms on a formula simplification that was a NOOP. DAG size: 179 [2018-12-24 14:29:12,410 WARN L181 SmtUtils]: Spent 239.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2018-12-24 14:29:12,862 WARN L181 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-24 14:29:13,307 WARN L181 SmtUtils]: Spent 226.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-24 14:29:13,817 WARN L181 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-24 14:29:14,261 WARN L181 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-24 14:29:14,671 WARN L181 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-24 14:29:15,056 WARN L181 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 14:29:15,424 WARN L181 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 14:29:15,794 WARN L181 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 14:29:16,154 WARN L181 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 14:29:16,505 WARN L181 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 14:29:16,844 WARN L181 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 14:29:17,167 WARN L181 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 14:29:17,488 WARN L181 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 14:29:17,791 WARN L181 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 14:29:18,077 WARN L181 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 14:29:18,642 WARN L181 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2018-12-24 14:29:18,987 WARN L181 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 84