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-c78c21b [2018-12-03 19:26:02,613 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 19:26:02,615 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 19:26:02,632 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2018-12-03 19:26:02,692 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 [2018-12-03 19:26:02,720 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 19:26:02,720 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 19:26:02,724 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 19:26:02,724 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 19:26:02,725 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 19:26:02,725 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 19:26:02,725 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 19:26:02,725 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 19:26:02,725 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 19:26:02,725 INFO L133 SettingsManager]: * Underlying domain=OctagonDomain [2018-12-03 19:26:02,728 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 19:26:02,728 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 19:26:02,728 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 19:26:02,728 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 19:26:02,729 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 19:26:02,729 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 19:26:02,729 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 19:26:02,731 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 19:26:02,731 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 19:26:02,731 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 19:26:02,732 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 19:26:02,732 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 19:26:02,732 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 19:26:02,732 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 19:26:02,733 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 19:26:02,733 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 19:26:02,733 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 19:26:02,733 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 19:26:02,734 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 19:26:02,734 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 19:26:02,734 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 19:26:02,734 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 19:26:02,734 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 19:26:02,735 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 19:26:02,735 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 19:26:02,735 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 19:26:02,735 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 19:26:02,735 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 19:26:02,735 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 19:26:02,738 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 19:26:02,775 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 19:26:02,789 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 19:26:02,793 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 19:26:02,795 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 19:26:02,795 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 19:26:02,796 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/ArrayInit02.bpl [2018-12-03 19:26:02,796 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/ArrayInit02.bpl' [2018-12-03 19:26:02,838 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 19:26:02,841 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 19:26:02,841 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 19:26:02,841 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 19:26:02,842 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 19:26:02,863 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:26:02" (1/1) ... [2018-12-03 19:26:02,874 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:26:02" (1/1) ... [2018-12-03 19:26:02,884 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 19:26:02,885 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 19:26:02,885 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 19:26:02,886 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 19:26:02,898 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:26:02" (1/1) ... [2018-12-03 19:26:02,899 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:26:02" (1/1) ... [2018-12-03 19:26:02,899 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:26:02" (1/1) ... [2018-12-03 19:26:02,899 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:26:02" (1/1) ... [2018-12-03 19:26:02,904 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:26:02" (1/1) ... [2018-12-03 19:26:02,911 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:26:02" (1/1) ... [2018-12-03 19:26:02,913 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:26:02" (1/1) ... [2018-12-03 19:26:02,914 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 19:26:02,914 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 19:26:02,915 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 19:26:02,915 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 19:26:02,916 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:26:02" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory: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 [2018-12-03 19:26:02,979 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2018-12-03 19:26:02,980 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 19:26:02,980 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 19:26:03,327 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 19:26:03,328 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-03 19:26:03,328 INFO L202 PluginConnector]: Adding new model ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 07:26:03 BoogieIcfgContainer [2018-12-03 19:26:03,328 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 19:26:03,329 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 19:26:03,330 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 19:26:03,333 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 19:26:03,334 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:26:02" (1/2) ... [2018-12-03 19:26:03,335 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73509a27 and model type ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 07:26:03, skipping insertion in model container [2018-12-03 19:26:03,335 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 07:26:03" (2/2) ... [2018-12-03 19:26:03,338 INFO L112 eAbstractionObserver]: Analyzing ICFG ArrayInit02.bpl [2018-12-03 19:26:03,348 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 19:26:03,356 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 19:26:03,376 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 19:26:03,414 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 19:26:03,414 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 19:26:03,414 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 19:26:03,414 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 19:26:03,415 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 19:26:03,415 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 19:26:03,415 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 19:26:03,415 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 19:26:03,433 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2018-12-03 19:26:03,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 19:26:03,440 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:03,441 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-12-03 19:26:03,444 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:03,450 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:03,451 INFO L82 PathProgramCache]: Analyzing trace with hash 900035954, now seen corresponding path program 1 times [2018-12-03 19:26:03,454 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:03,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:03,509 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:03,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:03,509 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:03,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:03,714 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:03,717 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 19:26:03,717 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 19:26:03,717 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 19:26:03,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 19:26:03,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 19:26:03,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-03 19:26:03,742 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 4 states. [2018-12-03 19:26:03,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:03,940 INFO L93 Difference]: Finished difference Result 26 states and 34 transitions. [2018-12-03 19:26:03,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 19:26:03,942 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-12-03 19:26:03,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:03,954 INFO L225 Difference]: With dead ends: 26 [2018-12-03 19:26:03,954 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 19:26:03,958 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 [2018-12-03 19:26:03,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 19:26:03,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2018-12-03 19:26:03,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-12-03 19:26:03,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 14 transitions. [2018-12-03 19:26:03,994 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 14 transitions. Word has length 6 [2018-12-03 19:26:03,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:03,994 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 14 transitions. [2018-12-03 19:26:03,994 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 19:26:03,994 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 14 transitions. [2018-12-03 19:26:03,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-03 19:26:03,995 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:03,995 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 19:26:03,995 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:03,996 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:03,996 INFO L82 PathProgramCache]: Analyzing trace with hash 429804648, now seen corresponding path program 1 times [2018-12-03 19:26:03,996 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:03,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:03,998 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:03,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:03,999 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:04,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:04,094 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:04,094 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 19:26:04,094 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-12-03 19:26:04,095 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 19:26:04,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 19:26:04,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 19:26:04,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-03 19:26:04,098 INFO L87 Difference]: Start difference. First operand 11 states and 14 transitions. Second operand 4 states. [2018-12-03 19:26:04,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:04,203 INFO L93 Difference]: Finished difference Result 25 states and 31 transitions. [2018-12-03 19:26:04,204 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 19:26:04,204 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2018-12-03 19:26:04,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:04,205 INFO L225 Difference]: With dead ends: 25 [2018-12-03 19:26:04,205 INFO L226 Difference]: Without dead ends: 23 [2018-12-03 19:26:04,207 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-12-03 19:26:04,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-12-03 19:26:04,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 19. [2018-12-03 19:26:04,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 19:26:04,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 26 transitions. [2018-12-03 19:26:04,214 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 26 transitions. Word has length 9 [2018-12-03 19:26:04,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:04,214 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 26 transitions. [2018-12-03 19:26:04,214 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 19:26:04,215 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 26 transitions. [2018-12-03 19:26:04,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-03 19:26:04,216 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:04,216 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 19:26:04,216 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:04,216 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:04,217 INFO L82 PathProgramCache]: Analyzing trace with hash 429806570, now seen corresponding path program 1 times [2018-12-03 19:26:04,217 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:04,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:04,218 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:04,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:04,219 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:04,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:04,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 19:26:04,291 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 19:26:04,291 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 19:26:04,291 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 19:26:04,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 19:26:04,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 19:26:04,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 19:26:04,293 INFO L87 Difference]: Start difference. First operand 19 states and 26 transitions. Second operand 3 states. [2018-12-03 19:26:04,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:04,342 INFO L93 Difference]: Finished difference Result 24 states and 31 transitions. [2018-12-03 19:26:04,342 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 19:26:04,342 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2018-12-03 19:26:04,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:04,343 INFO L225 Difference]: With dead ends: 24 [2018-12-03 19:26:04,343 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 19:26:04,344 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 [2018-12-03 19:26:04,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 19:26:04,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2018-12-03 19:26:04,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-12-03 19:26:04,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2018-12-03 19:26:04,348 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2018-12-03 19:26:04,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:04,348 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2018-12-03 19:26:04,348 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 19:26:04,349 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2018-12-03 19:26:04,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-03 19:26:04,349 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:04,350 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 19:26:04,350 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:04,350 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:04,350 INFO L82 PathProgramCache]: Analyzing trace with hash -2090155286, now seen corresponding path program 1 times [2018-12-03 19:26:04,351 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:04,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:04,352 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:04,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:04,353 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:04,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:04,700 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 15 [2018-12-03 19:26:04,750 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:04,751 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:04,751 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:04,752 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 10 with the following transitions: [2018-12-03 19:26:04,755 INFO L205 CegarAbsIntRunner]: [0], [4], [9], [11], [13], [17], [20], [26], [27] [2018-12-03 19:26:04,805 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 19:26:04,805 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 19:26:05,045 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 19:26:05,046 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. [2018-12-03 19:26:05,095 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:05,097 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 19:26:05,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:05,097 INFO L192 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 [2018-12-03 19:26:05,114 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:05,115 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:26:05,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:05,151 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:05,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:05,371 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:05,458 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:05,480 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:05,480 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 6 [2018-12-03 19:26:05,480 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:05,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 19:26:05,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 19:26:05,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-12-03 19:26:05,482 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 7 states. [2018-12-03 19:26:05,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:05,740 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2018-12-03 19:26:05,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 19:26:05,742 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2018-12-03 19:26:05,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:05,743 INFO L225 Difference]: With dead ends: 26 [2018-12-03 19:26:05,743 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 19:26:05,744 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 [2018-12-03 19:26:05,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 19:26:05,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 14. [2018-12-03 19:26:05,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-12-03 19:26:05,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2018-12-03 19:26:05,748 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 9 [2018-12-03 19:26:05,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:05,749 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2018-12-03 19:26:05,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 19:26:05,749 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2018-12-03 19:26:05,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 19:26:05,750 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:05,750 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 19:26:05,750 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:05,751 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:05,751 INFO L82 PathProgramCache]: Analyzing trace with hash -368470767, now seen corresponding path program 1 times [2018-12-03 19:26:05,751 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:05,752 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:05,752 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:05,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:05,753 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:05,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:05,826 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:05,826 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:05,826 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:05,827 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 19:26:05,827 INFO L205 CegarAbsIntRunner]: [0], [4], [9], [11], [13], [17], [20], [22], [26], [27], [30], [32] [2018-12-03 19:26:05,828 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 19:26:05,829 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 19:26:06,086 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 19:26:06,094 INFO L272 AbstractInterpreter]: Visited 12 different actions 100 times. Merged at 11 different actions 72 times. Widened at 3 different actions 7 times. Found 18 fixpoints after 6 different actions. Largest state had 0 variables. [2018-12-03 19:26:06,101 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:06,101 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 19:26:06,101 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:06,101 INFO L192 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 [2018-12-03 19:26:06,111 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:06,111 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:26:06,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:06,121 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:06,236 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:06,237 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:06,282 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:06,309 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:06,309 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 7 [2018-12-03 19:26:06,310 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:06,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 19:26:06,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 19:26:06,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-12-03 19:26:06,311 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 8 states. [2018-12-03 19:26:06,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:06,720 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2018-12-03 19:26:06,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 19:26:06,721 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 13 [2018-12-03 19:26:06,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:06,721 INFO L225 Difference]: With dead ends: 31 [2018-12-03 19:26:06,722 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 19:26:06,722 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2018-12-03 19:26:06,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 19:26:06,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2018-12-03 19:26:06,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-12-03 19:26:06,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2018-12-03 19:26:06,726 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2018-12-03 19:26:06,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:06,726 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2018-12-03 19:26:06,727 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 19:26:06,727 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2018-12-03 19:26:06,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 19:26:06,727 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:06,728 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 19:26:06,728 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:06,728 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:06,729 INFO L82 PathProgramCache]: Analyzing trace with hash -256855911, now seen corresponding path program 2 times [2018-12-03 19:26:06,729 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:06,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:06,730 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:06,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:06,730 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:06,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:07,041 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:07,042 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:07,042 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:07,042 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:07,042 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:07,042 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:07,043 INFO L192 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 [2018-12-03 19:26:07,063 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:26:07,064 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:26:07,075 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-03 19:26:07,075 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:07,077 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:07,156 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:07,156 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:07,198 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:07,217 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:07,217 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 10 [2018-12-03 19:26:07,218 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:07,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 19:26:07,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 19:26:07,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2018-12-03 19:26:07,219 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 11 states. [2018-12-03 19:26:07,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:07,502 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2018-12-03 19:26:07,502 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 19:26:07,502 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-03 19:26:07,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:07,504 INFO L225 Difference]: With dead ends: 35 [2018-12-03 19:26:07,504 INFO L226 Difference]: Without dead ends: 28 [2018-12-03 19:26:07,505 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 25 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2018-12-03 19:26:07,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-03 19:26:07,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 21. [2018-12-03 19:26:07,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 19:26:07,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2018-12-03 19:26:07,510 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 16 [2018-12-03 19:26:07,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:07,511 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2018-12-03 19:26:07,511 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 19:26:07,511 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2018-12-03 19:26:07,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 19:26:07,512 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:07,512 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2018-12-03 19:26:07,512 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:07,513 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:07,513 INFO L82 PathProgramCache]: Analyzing trace with hash 1110643520, now seen corresponding path program 3 times [2018-12-03 19:26:07,513 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:07,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:07,514 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:07,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:07,514 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:07,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:07,661 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:07,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:07,662 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:07,662 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:07,662 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:07,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:07,662 INFO L192 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 [2018-12-03 19:26:07,672 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:26:07,672 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:26:07,679 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:26:07,679 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:07,682 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:07,727 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:07,728 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:07,770 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:07,789 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:07,790 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 10 [2018-12-03 19:26:07,790 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:07,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 19:26:07,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 19:26:07,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2018-12-03 19:26:07,792 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 11 states. [2018-12-03 19:26:07,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:07,917 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2018-12-03 19:26:07,918 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 19:26:07,919 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-12-03 19:26:07,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:07,920 INFO L225 Difference]: With dead ends: 45 [2018-12-03 19:26:07,920 INFO L226 Difference]: Without dead ends: 26 [2018-12-03 19:26:07,921 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 [2018-12-03 19:26:07,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-12-03 19:26:07,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2018-12-03 19:26:07,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-03 19:26:07,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2018-12-03 19:26:07,993 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 20 [2018-12-03 19:26:07,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:07,993 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2018-12-03 19:26:07,993 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 19:26:07,994 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2018-12-03 19:26:07,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-03 19:26:07,994 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:07,995 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1] [2018-12-03 19:26:07,995 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:07,995 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:07,996 INFO L82 PathProgramCache]: Analyzing trace with hash -1324912968, now seen corresponding path program 4 times [2018-12-03 19:26:07,999 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:08,000 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:08,000 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:08,000 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:08,000 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:08,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:08,304 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:08,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:08,305 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:08,305 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:08,305 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:08,305 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:08,305 INFO L192 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 [2018-12-03 19:26:08,314 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:08,314 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:26:08,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:08,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:08,469 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:08,469 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:08,510 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:08,529 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:08,529 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 13 [2018-12-03 19:26:08,529 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:08,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 19:26:08,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 19:26:08,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2018-12-03 19:26:08,530 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 14 states. [2018-12-03 19:26:08,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:08,922 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2018-12-03 19:26:08,924 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 19:26:08,924 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 23 [2018-12-03 19:26:08,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:08,925 INFO L225 Difference]: With dead ends: 49 [2018-12-03 19:26:08,926 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 19:26:08,926 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 [2018-12-03 19:26:08,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 19:26:08,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 28. [2018-12-03 19:26:08,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-03 19:26:08,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2018-12-03 19:26:08,932 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2018-12-03 19:26:08,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:08,932 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2018-12-03 19:26:08,932 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 19:26:08,932 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2018-12-03 19:26:08,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-03 19:26:08,933 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:08,933 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2018-12-03 19:26:08,933 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:08,934 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:08,934 INFO L82 PathProgramCache]: Analyzing trace with hash 1588570591, now seen corresponding path program 5 times [2018-12-03 19:26:08,934 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:08,935 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:08,935 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:08,935 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:08,937 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:08,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:09,143 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:09,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:09,144 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:09,144 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:09,144 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:09,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:09,145 INFO L192 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 [2018-12-03 19:26:09,160 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:26:09,161 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:26:09,184 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 19:26:09,184 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:09,186 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:09,264 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:09,264 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:09,306 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:09,333 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:09,333 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 13 [2018-12-03 19:26:09,334 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:09,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 19:26:09,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 19:26:09,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2018-12-03 19:26:09,335 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 14 states. [2018-12-03 19:26:09,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:09,666 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2018-12-03 19:26:09,666 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 19:26:09,666 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 27 [2018-12-03 19:26:09,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:09,667 INFO L225 Difference]: With dead ends: 60 [2018-12-03 19:26:09,667 INFO L226 Difference]: Without dead ends: 33 [2018-12-03 19:26:09,668 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 7 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=215, Unknown=0, NotChecked=0, Total=306 [2018-12-03 19:26:09,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-03 19:26:09,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2018-12-03 19:26:09,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-03 19:26:09,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2018-12-03 19:26:09,674 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 27 [2018-12-03 19:26:09,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:09,674 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2018-12-03 19:26:09,674 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 19:26:09,674 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2018-12-03 19:26:09,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-03 19:26:09,675 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:09,675 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1] [2018-12-03 19:26:09,675 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:09,675 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:09,675 INFO L82 PathProgramCache]: Analyzing trace with hash 366737255, now seen corresponding path program 6 times [2018-12-03 19:26:09,676 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:09,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:09,676 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:09,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:09,677 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:09,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:09,877 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 3 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:09,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:09,877 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:09,877 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:09,878 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:09,878 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:09,878 INFO L192 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 [2018-12-03 19:26:09,887 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:26:09,887 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:26:09,899 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:26:09,899 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:09,901 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:10,088 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 3 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:10,088 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:10,136 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 3 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:10,156 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:10,156 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 16 [2018-12-03 19:26:10,156 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:10,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 19:26:10,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 19:26:10,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2018-12-03 19:26:10,158 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 17 states. [2018-12-03 19:26:10,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:10,943 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2018-12-03 19:26:10,947 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 19:26:10,947 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 30 [2018-12-03 19:26:10,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:10,948 INFO L225 Difference]: With dead ends: 64 [2018-12-03 19:26:10,948 INFO L226 Difference]: Without dead ends: 50 [2018-12-03 19:26:10,949 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 [2018-12-03 19:26:10,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-12-03 19:26:10,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 35. [2018-12-03 19:26:10,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-12-03 19:26:10,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-12-03 19:26:10,956 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 30 [2018-12-03 19:26:10,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:10,957 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-12-03 19:26:10,957 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 19:26:10,957 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-12-03 19:26:10,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-12-03 19:26:10,958 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:10,958 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2018-12-03 19:26:10,959 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:10,959 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:10,959 INFO L82 PathProgramCache]: Analyzing trace with hash -1079885042, now seen corresponding path program 7 times [2018-12-03 19:26:10,959 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:10,960 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:10,960 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:10,960 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:10,961 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:10,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:11,378 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 36 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:11,379 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:11,379 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:11,379 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:11,379 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:11,379 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:11,379 INFO L192 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 [2018-12-03 19:26:11,388 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:11,388 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:26:11,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:11,400 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:11,583 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 36 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:11,584 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:11,651 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 36 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:11,673 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:11,673 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 16 [2018-12-03 19:26:11,673 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:11,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 19:26:11,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 19:26:11,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2018-12-03 19:26:11,682 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 17 states. [2018-12-03 19:26:12,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:12,055 INFO L93 Difference]: Finished difference Result 75 states and 79 transitions. [2018-12-03 19:26:12,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 19:26:12,055 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 34 [2018-12-03 19:26:12,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:12,056 INFO L225 Difference]: With dead ends: 75 [2018-12-03 19:26:12,056 INFO L226 Difference]: Without dead ends: 40 [2018-12-03 19:26:12,057 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 [2018-12-03 19:26:12,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-03 19:26:12,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2018-12-03 19:26:12,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-12-03 19:26:12,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-12-03 19:26:12,064 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 34 [2018-12-03 19:26:12,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:12,065 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-12-03 19:26:12,065 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 19:26:12,065 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-12-03 19:26:12,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-12-03 19:26:12,066 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:12,066 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1] [2018-12-03 19:26:12,066 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:12,067 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:12,067 INFO L82 PathProgramCache]: Analyzing trace with hash -921359226, now seen corresponding path program 8 times [2018-12-03 19:26:12,067 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:12,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:12,068 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:12,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:12,068 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:12,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:12,393 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 4 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:12,393 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:12,393 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:12,394 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:12,394 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:12,394 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:12,394 INFO L192 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 [2018-12-03 19:26:12,405 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:26:12,405 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:26:12,420 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-03 19:26:12,421 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:12,423 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:12,886 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 32 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:12,887 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:13,672 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 28 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:13,691 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:13,692 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 14] total 33 [2018-12-03 19:26:13,692 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:13,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 19:26:13,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 19:26:13,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=961, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 19:26:13,694 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 27 states. [2018-12-03 19:26:15,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:15,780 INFO L93 Difference]: Finished difference Result 97 states and 103 transitions. [2018-12-03 19:26:15,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 19:26:15,781 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 37 [2018-12-03 19:26:15,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:15,782 INFO L225 Difference]: With dead ends: 97 [2018-12-03 19:26:15,782 INFO L226 Difference]: Without dead ends: 58 [2018-12-03 19:26:15,785 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 47 SyntacticMatches, 6 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 855 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=499, Invalid=3533, Unknown=0, NotChecked=0, Total=4032 [2018-12-03 19:26:15,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-03 19:26:15,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 45. [2018-12-03 19:26:15,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 19:26:15,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2018-12-03 19:26:15,792 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 37 [2018-12-03 19:26:15,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:15,793 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2018-12-03 19:26:15,793 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 19:26:15,793 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2018-12-03 19:26:15,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-03 19:26:15,794 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:15,794 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1] [2018-12-03 19:26:15,795 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:15,795 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:15,795 INFO L82 PathProgramCache]: Analyzing trace with hash -1868574667, now seen corresponding path program 9 times [2018-12-03 19:26:15,795 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:15,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:15,796 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:15,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:15,796 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:15,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:16,209 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 5 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:16,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:16,210 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:16,210 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:16,210 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:16,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:16,210 INFO L192 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 [2018-12-03 19:26:16,220 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:26:16,220 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:26:16,230 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:26:16,230 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:16,233 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:16,511 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 5 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:16,511 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:16,556 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 5 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:16,579 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:16,579 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 22 [2018-12-03 19:26:16,580 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:16,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 19:26:16,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 19:26:16,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=448, Unknown=0, NotChecked=0, Total=506 [2018-12-03 19:26:16,581 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 23 states. [2018-12-03 19:26:17,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:17,977 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2018-12-03 19:26:17,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 19:26:17,977 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 44 [2018-12-03 19:26:17,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:17,979 INFO L225 Difference]: With dead ends: 94 [2018-12-03 19:26:17,979 INFO L226 Difference]: Without dead ends: 72 [2018-12-03 19:26:17,980 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=149, Invalid=1041, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 19:26:17,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-12-03 19:26:17,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 49. [2018-12-03 19:26:17,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-03 19:26:17,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2018-12-03 19:26:17,989 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 44 [2018-12-03 19:26:17,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:17,989 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2018-12-03 19:26:17,989 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 19:26:17,989 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2018-12-03 19:26:17,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 19:26:17,991 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:17,991 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1] [2018-12-03 19:26:17,991 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:17,991 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:17,991 INFO L82 PathProgramCache]: Analyzing trace with hash 269550812, now seen corresponding path program 10 times [2018-12-03 19:26:17,991 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:17,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:17,992 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:17,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:17,993 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:17,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:18,171 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:18,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:18,171 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:18,171 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:18,171 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:18,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:18,172 INFO L192 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 [2018-12-03 19:26:18,180 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:18,180 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:26:18,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:18,204 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:18,448 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:18,449 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:18,663 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:18,685 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:18,686 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 22 [2018-12-03 19:26:18,686 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:18,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 19:26:18,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 19:26:18,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-12-03 19:26:18,687 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 23 states. [2018-12-03 19:26:18,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:18,941 INFO L93 Difference]: Finished difference Result 105 states and 109 transitions. [2018-12-03 19:26:18,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 19:26:18,941 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 48 [2018-12-03 19:26:18,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:18,943 INFO L225 Difference]: With dead ends: 105 [2018-12-03 19:26:18,943 INFO L226 Difference]: Without dead ends: 54 [2018-12-03 19:26:18,944 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 75 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=232, Invalid=638, Unknown=0, NotChecked=0, Total=870 [2018-12-03 19:26:18,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-12-03 19:26:18,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2018-12-03 19:26:18,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-12-03 19:26:18,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2018-12-03 19:26:18,954 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 48 [2018-12-03 19:26:18,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:18,954 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2018-12-03 19:26:18,954 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 19:26:18,954 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2018-12-03 19:26:18,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-12-03 19:26:18,955 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:18,955 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1] [2018-12-03 19:26:18,956 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:18,956 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:18,956 INFO L82 PathProgramCache]: Analyzing trace with hash 2089942100, now seen corresponding path program 11 times [2018-12-03 19:26:18,956 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:18,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:18,957 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:18,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:18,957 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:18,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:19,290 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 6 proven. 142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:19,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:19,290 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:19,290 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:19,290 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:19,291 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:19,291 INFO L192 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 [2018-12-03 19:26:19,300 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:26:19,300 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:26:19,320 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-12-03 19:26:19,321 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:19,324 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:19,542 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 6 proven. 142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:19,542 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:19,592 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 6 proven. 142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:19,612 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:19,612 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 25 [2018-12-03 19:26:19,612 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:19,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 19:26:19,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 19:26:19,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=584, Unknown=0, NotChecked=0, Total=650 [2018-12-03 19:26:19,613 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 26 states. [2018-12-03 19:26:21,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:21,294 INFO L93 Difference]: Finished difference Result 109 states and 114 transitions. [2018-12-03 19:26:21,294 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 19:26:21,294 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 51 [2018-12-03 19:26:21,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:21,296 INFO L225 Difference]: With dead ends: 109 [2018-12-03 19:26:21,296 INFO L226 Difference]: Without dead ends: 83 [2018-12-03 19:26:21,297 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=179, Invalid=1381, Unknown=0, NotChecked=0, Total=1560 [2018-12-03 19:26:21,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-12-03 19:26:21,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 56. [2018-12-03 19:26:21,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-12-03 19:26:21,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2018-12-03 19:26:21,306 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 51 [2018-12-03 19:26:21,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:21,307 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2018-12-03 19:26:21,307 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 19:26:21,307 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2018-12-03 19:26:21,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-12-03 19:26:21,308 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:21,308 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1] [2018-12-03 19:26:21,308 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:21,308 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:21,309 INFO L82 PathProgramCache]: Analyzing trace with hash 549587323, now seen corresponding path program 12 times [2018-12-03 19:26:21,309 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:21,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:21,310 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:21,310 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:21,310 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:21,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:21,604 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 105 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:21,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:21,605 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:21,605 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:21,605 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:21,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:21,605 INFO L192 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 [2018-12-03 19:26:21,616 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:26:21,616 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:26:21,626 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:26:21,626 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:21,628 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:21,784 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 105 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:21,784 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:21,915 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 105 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:21,934 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:21,934 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 25 [2018-12-03 19:26:21,934 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:21,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 19:26:21,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 19:26:21,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2018-12-03 19:26:21,935 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 26 states. [2018-12-03 19:26:22,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:22,328 INFO L93 Difference]: Finished difference Result 120 states and 124 transitions. [2018-12-03 19:26:22,328 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 19:26:22,328 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 55 [2018-12-03 19:26:22,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:22,329 INFO L225 Difference]: With dead ends: 120 [2018-12-03 19:26:22,330 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 19:26:22,331 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 86 SyntacticMatches, 15 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=293, Invalid=829, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 19:26:22,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 19:26:22,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2018-12-03 19:26:22,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-12-03 19:26:22,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2018-12-03 19:26:22,341 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 55 [2018-12-03 19:26:22,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:22,341 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2018-12-03 19:26:22,341 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 19:26:22,341 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2018-12-03 19:26:22,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-12-03 19:26:22,342 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:22,343 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1] [2018-12-03 19:26:22,343 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:22,343 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:22,343 INFO L82 PathProgramCache]: Analyzing trace with hash -1743111421, now seen corresponding path program 13 times [2018-12-03 19:26:22,343 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:22,344 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:22,344 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:22,344 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:22,344 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:22,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:22,956 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 7 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:22,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:22,957 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:22,957 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:22,957 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:22,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:22,957 INFO L192 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 [2018-12-03 19:26:22,971 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:22,971 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:26:22,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:22,988 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:23,288 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 7 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:23,288 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:23,451 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 7 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:23,470 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:23,471 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 28 [2018-12-03 19:26:23,471 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:23,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 19:26:23,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 19:26:23,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=738, Unknown=0, NotChecked=0, Total=812 [2018-12-03 19:26:23,472 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 29 states. [2018-12-03 19:26:25,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:25,159 INFO L93 Difference]: Finished difference Result 124 states and 129 transitions. [2018-12-03 19:26:25,159 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 19:26:25,159 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 58 [2018-12-03 19:26:25,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:25,160 INFO L225 Difference]: With dead ends: 124 [2018-12-03 19:26:25,160 INFO L226 Difference]: Without dead ends: 94 [2018-12-03 19:26:25,161 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 103 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=211, Invalid=1769, Unknown=0, NotChecked=0, Total=1980 [2018-12-03 19:26:25,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-12-03 19:26:25,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 63. [2018-12-03 19:26:25,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-03 19:26:25,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2018-12-03 19:26:25,179 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 58 [2018-12-03 19:26:25,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:25,179 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2018-12-03 19:26:25,179 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 19:26:25,179 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2018-12-03 19:26:25,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 19:26:25,181 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:25,181 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1] [2018-12-03 19:26:25,182 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:25,182 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:25,182 INFO L82 PathProgramCache]: Analyzing trace with hash -1415751510, now seen corresponding path program 14 times [2018-12-03 19:26:25,182 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:25,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:25,187 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:25,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:25,188 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:25,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:26,020 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 136 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:26,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:26,020 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:26,020 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:26,021 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:26,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:26,021 INFO L192 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 [2018-12-03 19:26:26,029 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:26:26,029 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:26:26,044 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-03 19:26:26,044 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:26,048 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:26,286 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 136 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:26,286 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:26,438 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 136 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:26,457 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:26,457 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 28 [2018-12-03 19:26:26,457 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:26,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 19:26:26,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 19:26:26,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2018-12-03 19:26:26,458 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand 29 states. [2018-12-03 19:26:26,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:26,861 INFO L93 Difference]: Finished difference Result 135 states and 139 transitions. [2018-12-03 19:26:26,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 19:26:26,862 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2018-12-03 19:26:26,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:26,862 INFO L225 Difference]: With dead ends: 135 [2018-12-03 19:26:26,862 INFO L226 Difference]: Without dead ends: 68 [2018-12-03 19:26:26,864 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 97 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=361, Invalid=1045, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 19:26:26,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-12-03 19:26:26,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2018-12-03 19:26:26,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-12-03 19:26:26,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2018-12-03 19:26:26,874 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 62 [2018-12-03 19:26:26,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:26,874 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2018-12-03 19:26:26,875 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 19:26:26,875 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2018-12-03 19:26:26,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-12-03 19:26:26,875 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:26,876 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1] [2018-12-03 19:26:26,876 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:26,876 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:26,876 INFO L82 PathProgramCache]: Analyzing trace with hash 175889954, now seen corresponding path program 15 times [2018-12-03 19:26:26,876 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:26,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:26,877 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:26,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:26,877 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:26,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:27,566 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 8 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:27,566 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:27,566 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:27,566 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:27,566 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:27,567 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:27,567 INFO L192 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 [2018-12-03 19:26:27,576 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:26:27,576 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:26:27,601 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:26:27,601 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:27,604 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:27,987 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 8 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:27,987 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:28,068 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 8 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:28,088 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:28,088 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 31 [2018-12-03 19:26:28,088 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:28,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 19:26:28,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 19:26:28,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=910, Unknown=0, NotChecked=0, Total=992 [2018-12-03 19:26:28,089 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 32 states. [2018-12-03 19:26:30,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:30,100 INFO L93 Difference]: Finished difference Result 139 states and 144 transitions. [2018-12-03 19:26:30,101 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 19:26:30,101 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 65 [2018-12-03 19:26:30,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:30,102 INFO L225 Difference]: With dead ends: 139 [2018-12-03 19:26:30,102 INFO L226 Difference]: Without dead ends: 105 [2018-12-03 19:26:30,104 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 [2018-12-03 19:26:30,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-12-03 19:26:30,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 70. [2018-12-03 19:26:30,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-12-03 19:26:30,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2018-12-03 19:26:30,113 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 65 [2018-12-03 19:26:30,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:30,114 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2018-12-03 19:26:30,114 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 19:26:30,114 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2018-12-03 19:26:30,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-12-03 19:26:30,115 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:30,115 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1] [2018-12-03 19:26:30,115 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:30,115 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:30,115 INFO L82 PathProgramCache]: Analyzing trace with hash 2774089, now seen corresponding path program 16 times [2018-12-03 19:26:30,115 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:30,116 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:30,116 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:30,116 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:30,116 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:30,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:30,379 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 171 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:30,379 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:30,379 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:30,379 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:30,379 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:30,379 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:30,380 INFO L192 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 [2018-12-03 19:26:30,388 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:30,389 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:26:30,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:30,404 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:30,834 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 171 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:30,835 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:31,054 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 171 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:31,073 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:31,073 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 31 [2018-12-03 19:26:31,073 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:31,074 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 19:26:31,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 19:26:31,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2018-12-03 19:26:31,074 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 32 states. [2018-12-03 19:26:31,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:31,464 INFO L93 Difference]: Finished difference Result 150 states and 154 transitions. [2018-12-03 19:26:31,465 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-03 19:26:31,465 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 69 [2018-12-03 19:26:31,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:31,466 INFO L225 Difference]: With dead ends: 150 [2018-12-03 19:26:31,466 INFO L226 Difference]: Without dead ends: 75 [2018-12-03 19:26:31,468 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 108 SyntacticMatches, 19 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=436, Invalid=1286, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 19:26:31,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-12-03 19:26:31,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2018-12-03 19:26:31,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-03 19:26:31,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2018-12-03 19:26:31,477 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 69 [2018-12-03 19:26:31,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:31,477 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2018-12-03 19:26:31,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 19:26:31,478 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2018-12-03 19:26:31,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 19:26:31,478 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:31,479 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 1, 1, 1, 1, 1] [2018-12-03 19:26:31,479 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:31,479 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:31,479 INFO L82 PathProgramCache]: Analyzing trace with hash 2036938705, now seen corresponding path program 17 times [2018-12-03 19:26:31,479 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:31,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:31,480 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:31,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:31,480 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:31,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:31,966 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 9 proven. 307 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:31,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:31,966 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:31,966 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:31,966 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:31,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:31,966 INFO L192 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 [2018-12-03 19:26:31,975 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:26:31,976 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:26:31,994 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-12-03 19:26:31,995 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:31,997 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:32,889 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 162 proven. 154 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:32,889 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:33,673 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 153 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:33,692 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:33,692 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24, 24] total 58 [2018-12-03 19:26:33,693 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:33,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 19:26:33,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 19:26:33,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=421, Invalid=3001, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 19:26:33,694 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand 47 states. [2018-12-03 19:26:36,284 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2018-12-03 19:26:38,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:38,247 INFO L93 Difference]: Finished difference Result 192 states and 198 transitions. [2018-12-03 19:26:38,248 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-03 19:26:38,248 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 72 [2018-12-03 19:26:38,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:38,249 INFO L225 Difference]: With dead ends: 192 [2018-12-03 19:26:38,249 INFO L226 Difference]: Without dead ends: 113 [2018-12-03 19:26:38,255 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 97 SyntacticMatches, 11 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3015 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=1319, Invalid=12723, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 19:26:38,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2018-12-03 19:26:38,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 80. [2018-12-03 19:26:38,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-12-03 19:26:38,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2018-12-03 19:26:38,265 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 72 [2018-12-03 19:26:38,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:38,265 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2018-12-03 19:26:38,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 19:26:38,265 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2018-12-03 19:26:38,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-12-03 19:26:38,265 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:38,266 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1] [2018-12-03 19:26:38,266 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:38,266 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:38,266 INFO L82 PathProgramCache]: Analyzing trace with hash 1070649840, now seen corresponding path program 18 times [2018-12-03 19:26:38,266 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:38,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:38,267 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:38,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:38,267 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:38,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:38,777 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 10 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:38,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:38,778 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:38,778 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:38,778 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:38,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:38,778 INFO L192 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 [2018-12-03 19:26:38,786 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:26:38,787 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:26:38,800 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:26:38,800 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:38,802 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:39,427 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 10 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:39,428 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:39,511 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 10 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:39,532 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:39,532 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 37 [2018-12-03 19:26:39,532 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:39,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 19:26:39,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 19:26:39,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1308, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 19:26:39,534 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 38 states. [2018-12-03 19:26:41,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:41,748 INFO L93 Difference]: Finished difference Result 169 states and 174 transitions. [2018-12-03 19:26:41,750 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 19:26:41,750 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 79 [2018-12-03 19:26:41,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:41,752 INFO L225 Difference]: With dead ends: 169 [2018-12-03 19:26:41,752 INFO L226 Difference]: Without dead ends: 127 [2018-12-03 19:26:41,754 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 142 SyntacticMatches, 3 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=319, Invalid=3221, Unknown=0, NotChecked=0, Total=3540 [2018-12-03 19:26:41,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-12-03 19:26:41,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 84. [2018-12-03 19:26:41,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-12-03 19:26:41,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2018-12-03 19:26:41,762 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 79 [2018-12-03 19:26:41,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:41,763 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2018-12-03 19:26:41,763 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 19:26:41,763 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2018-12-03 19:26:41,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-12-03 19:26:41,764 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:41,764 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1] [2018-12-03 19:26:41,764 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:41,764 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:41,765 INFO L82 PathProgramCache]: Analyzing trace with hash -685461225, now seen corresponding path program 19 times [2018-12-03 19:26:41,765 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:41,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:41,765 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:41,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:41,766 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:41,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:42,052 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 253 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:42,052 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:42,052 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:42,052 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:42,052 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:42,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:42,053 INFO L192 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 [2018-12-03 19:26:42,061 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:42,061 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:26:42,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:42,078 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:42,354 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 253 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:42,354 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:42,556 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 253 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:42,574 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:42,575 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 37 [2018-12-03 19:26:42,575 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:42,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 19:26:42,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 19:26:42,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 19:26:42,576 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2018-12-03 19:26:43,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:43,091 INFO L93 Difference]: Finished difference Result 180 states and 184 transitions. [2018-12-03 19:26:43,091 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 19:26:43,091 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2018-12-03 19:26:43,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:43,092 INFO L225 Difference]: With dead ends: 180 [2018-12-03 19:26:43,093 INFO L226 Difference]: Without dead ends: 89 [2018-12-03 19:26:43,095 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 [2018-12-03 19:26:43,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-12-03 19:26:43,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2018-12-03 19:26:43,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-03 19:26:43,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2018-12-03 19:26:43,105 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2018-12-03 19:26:43,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:43,106 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2018-12-03 19:26:43,106 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 19:26:43,106 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2018-12-03 19:26:43,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 19:26:43,107 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:43,107 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 1, 1, 1, 1, 1] [2018-12-03 19:26:43,107 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:43,107 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:43,107 INFO L82 PathProgramCache]: Analyzing trace with hash -1750415713, now seen corresponding path program 20 times [2018-12-03 19:26:43,107 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:43,108 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:43,108 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:43,108 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:43,108 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:43,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:43,612 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 11 proven. 452 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:43,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:43,612 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:43,612 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:43,612 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:43,613 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:43,613 INFO L192 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 [2018-12-03 19:26:43,622 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:26:43,623 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:26:43,645 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-12-03 19:26:43,645 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:43,648 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:44,975 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 242 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:44,975 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:45,960 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 231 proven. 232 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:45,980 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:45,980 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 28, 28] total 68 [2018-12-03 19:26:45,981 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:45,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 19:26:45,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 19:26:45,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=560, Invalid=4132, Unknown=0, NotChecked=0, Total=4692 [2018-12-03 19:26:45,982 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand 55 states. [2018-12-03 19:26:52,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:52,341 INFO L93 Difference]: Finished difference Result 230 states and 236 transitions. [2018-12-03 19:26:52,342 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-12-03 19:26:52,342 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 86 [2018-12-03 19:26:52,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:52,343 INFO L225 Difference]: With dead ends: 230 [2018-12-03 19:26:52,343 INFO L226 Difference]: Without dead ends: 135 [2018-12-03 19:26:52,347 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 117 SyntacticMatches, 13 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4250 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=1745, Invalid=17995, Unknown=0, NotChecked=0, Total=19740 [2018-12-03 19:26:52,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-12-03 19:26:52,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 94. [2018-12-03 19:26:52,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-12-03 19:26:52,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2018-12-03 19:26:52,358 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 86 [2018-12-03 19:26:52,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:52,359 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2018-12-03 19:26:52,359 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 19:26:52,359 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2018-12-03 19:26:52,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-12-03 19:26:52,359 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:52,360 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1] [2018-12-03 19:26:52,360 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:52,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:52,360 INFO L82 PathProgramCache]: Analyzing trace with hash 2005850046, now seen corresponding path program 21 times [2018-12-03 19:26:52,360 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:52,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:52,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:52,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:52,361 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:52,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:53,134 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 12 proven. 535 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:53,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:53,134 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:53,134 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:53,134 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:53,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:53,135 INFO L192 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 [2018-12-03 19:26:53,146 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:26:53,146 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:26:53,163 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:26:53,163 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:26:53,165 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:53,671 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 12 proven. 535 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:53,671 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:53,752 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 12 proven. 535 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:53,770 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:53,771 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 43 [2018-12-03 19:26:53,771 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:53,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 19:26:53,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 19:26:53,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1778, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 19:26:53,772 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand 44 states. [2018-12-03 19:26:57,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:26:57,088 INFO L93 Difference]: Finished difference Result 199 states and 204 transitions. [2018-12-03 19:26:57,088 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 19:26:57,089 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 93 [2018-12-03 19:26:57,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:26:57,091 INFO L225 Difference]: With dead ends: 199 [2018-12-03 19:26:57,091 INFO L226 Difference]: Without dead ends: 149 [2018-12-03 19:26:57,092 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 [2018-12-03 19:26:57,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-12-03 19:26:57,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 98. [2018-12-03 19:26:57,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-12-03 19:26:57,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 100 transitions. [2018-12-03 19:26:57,105 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 100 transitions. Word has length 93 [2018-12-03 19:26:57,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:26:57,105 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 100 transitions. [2018-12-03 19:26:57,105 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 19:26:57,105 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 100 transitions. [2018-12-03 19:26:57,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-12-03 19:26:57,106 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:26:57,106 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1] [2018-12-03 19:26:57,106 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:26:57,106 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:26:57,106 INFO L82 PathProgramCache]: Analyzing trace with hash 1370431461, now seen corresponding path program 22 times [2018-12-03 19:26:57,107 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:26:57,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:57,107 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:26:57,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:26:57,108 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:26:57,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:57,430 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 351 proven. 247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:57,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:57,430 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:26:57,430 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:26:57,430 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:26:57,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:26:57,431 INFO L192 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 [2018-12-03 19:26:57,439 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:26:57,439 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:26:57,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:26:57,459 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:26:57,830 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 351 proven. 247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:57,831 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:26:59,224 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 351 proven. 247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:26:59,243 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:26:59,243 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 43 [2018-12-03 19:26:59,243 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:26:59,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 19:26:59,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 19:26:59,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 19:26:59,245 INFO L87 Difference]: Start difference. First operand 98 states and 100 transitions. Second operand 44 states. [2018-12-03 19:27:00,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:00,036 INFO L93 Difference]: Finished difference Result 210 states and 214 transitions. [2018-12-03 19:27:00,036 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-12-03 19:27:00,036 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 97 [2018-12-03 19:27:00,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:00,037 INFO L225 Difference]: With dead ends: 210 [2018-12-03 19:27:00,038 INFO L226 Difference]: Without dead ends: 103 [2018-12-03 19:27:00,039 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 152 SyntacticMatches, 27 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1066 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=806, Invalid=2500, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 19:27:00,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-12-03 19:27:00,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 101. [2018-12-03 19:27:00,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-12-03 19:27:00,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2018-12-03 19:27:00,055 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2018-12-03 19:27:00,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:00,055 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2018-12-03 19:27:00,056 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 19:27:00,056 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2018-12-03 19:27:00,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-12-03 19:27:00,056 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:00,056 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 1, 1, 1, 1, 1] [2018-12-03 19:27:00,056 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:00,056 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:00,057 INFO L82 PathProgramCache]: Analyzing trace with hash 1811736429, now seen corresponding path program 23 times [2018-12-03 19:27:00,057 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:00,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:00,057 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:00,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:00,058 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:00,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:00,973 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 13 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:00,973 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:00,973 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:00,973 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:00,974 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:00,974 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:00,974 INFO L192 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 [2018-12-03 19:27:00,983 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:00,983 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:01,007 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-03 19:27:01,007 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:01,010 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:01,702 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 13 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:01,702 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:01,782 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 13 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:01,812 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:01,812 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 46 [2018-12-03 19:27:01,812 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:01,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 19:27:01,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 19:27:01,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=2040, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 19:27:01,814 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand 47 states. [2018-12-03 19:27:04,382 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2018-12-03 19:27:05,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:05,382 INFO L93 Difference]: Finished difference Result 214 states and 219 transitions. [2018-12-03 19:27:05,382 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 19:27:05,382 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 100 [2018-12-03 19:27:05,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:05,383 INFO L225 Difference]: With dead ends: 214 [2018-12-03 19:27:05,384 INFO L226 Difference]: Without dead ends: 160 [2018-12-03 19:27:05,385 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 181 SyntacticMatches, 3 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 878 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=445, Invalid=5105, Unknown=0, NotChecked=0, Total=5550 [2018-12-03 19:27:05,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-12-03 19:27:05,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 105. [2018-12-03 19:27:05,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-12-03 19:27:05,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2018-12-03 19:27:05,404 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 100 [2018-12-03 19:27:05,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:05,405 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2018-12-03 19:27:05,405 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 19:27:05,405 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2018-12-03 19:27:05,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-12-03 19:27:05,405 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:05,405 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1] [2018-12-03 19:27:05,405 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:05,406 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:05,406 INFO L82 PathProgramCache]: Analyzing trace with hash 1008713748, now seen corresponding path program 24 times [2018-12-03 19:27:05,406 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:05,408 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:05,408 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:05,408 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:05,408 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:05,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:05,792 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 406 proven. 287 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:05,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:05,792 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:05,793 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:05,793 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:05,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:05,793 INFO L192 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 [2018-12-03 19:27:05,802 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:27:05,803 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:27:05,818 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:27:05,819 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:05,821 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:06,273 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 406 proven. 287 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:06,273 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:06,567 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 406 proven. 287 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:06,586 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:06,587 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 46 [2018-12-03 19:27:06,587 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:06,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 19:27:06,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 19:27:06,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 19:27:06,588 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand 47 states. [2018-12-03 19:27:07,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:07,208 INFO L93 Difference]: Finished difference Result 225 states and 229 transitions. [2018-12-03 19:27:07,209 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-12-03 19:27:07,209 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 104 [2018-12-03 19:27:07,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:07,209 INFO L225 Difference]: With dead ends: 225 [2018-12-03 19:27:07,210 INFO L226 Difference]: Without dead ends: 110 [2018-12-03 19:27:07,210 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 163 SyntacticMatches, 29 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1232 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=916, Invalid=2866, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 19:27:07,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2018-12-03 19:27:07,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 108. [2018-12-03 19:27:07,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-12-03 19:27:07,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions. [2018-12-03 19:27:07,230 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 104 [2018-12-03 19:27:07,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:07,230 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 110 transitions. [2018-12-03 19:27:07,230 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 19:27:07,231 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions. [2018-12-03 19:27:07,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-12-03 19:27:07,231 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:07,231 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1] [2018-12-03 19:27:07,232 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:07,232 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:07,232 INFO L82 PathProgramCache]: Analyzing trace with hash -1699483764, now seen corresponding path program 25 times [2018-12-03 19:27:07,232 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:07,233 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:07,233 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:07,233 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:07,233 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:07,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:07,966 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 14 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:07,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:07,966 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:07,966 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:07,966 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:07,967 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:07,967 INFO L192 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 [2018-12-03 19:27:07,975 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:07,976 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:07,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:07,999 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:08,627 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 14 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:08,627 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:08,705 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 14 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:08,724 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:08,724 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 49 [2018-12-03 19:27:08,724 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:08,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 19:27:08,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 19:27:08,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2320, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 19:27:08,726 INFO L87 Difference]: Start difference. First operand 108 states and 110 transitions. Second operand 50 states. [2018-12-03 19:27:13,579 WARN L180 SmtUtils]: Spent 371.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2018-12-03 19:27:13,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:13,897 INFO L93 Difference]: Finished difference Result 229 states and 234 transitions. [2018-12-03 19:27:13,897 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 19:27:13,897 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 107 [2018-12-03 19:27:13,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:13,898 INFO L225 Difference]: With dead ends: 229 [2018-12-03 19:27:13,898 INFO L226 Difference]: Without dead ends: 171 [2018-12-03 19:27:13,899 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 194 SyntacticMatches, 3 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1000 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=491, Invalid=5829, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 19:27:13,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2018-12-03 19:27:13,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 112. [2018-12-03 19:27:13,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-12-03 19:27:13,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 114 transitions. [2018-12-03 19:27:13,921 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 114 transitions. Word has length 107 [2018-12-03 19:27:13,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:13,921 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 114 transitions. [2018-12-03 19:27:13,921 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 19:27:13,921 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 114 transitions. [2018-12-03 19:27:13,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-12-03 19:27:13,922 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:13,922 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1] [2018-12-03 19:27:13,922 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:13,922 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:13,923 INFO L82 PathProgramCache]: Analyzing trace with hash -1446534989, now seen corresponding path program 26 times [2018-12-03 19:27:13,923 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:13,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:13,923 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:13,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:13,924 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:13,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:14,369 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 465 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:14,369 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:14,369 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:14,369 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:14,369 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:14,369 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:14,370 INFO L192 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 [2018-12-03 19:27:14,380 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:14,380 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:14,406 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-12-03 19:27:14,406 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:14,409 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:15,161 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 465 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:15,161 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:15,472 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 465 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:15,491 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:15,491 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 49 [2018-12-03 19:27:15,491 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:15,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 19:27:15,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 19:27:15,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 19:27:15,492 INFO L87 Difference]: Start difference. First operand 112 states and 114 transitions. Second operand 50 states. [2018-12-03 19:27:16,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:16,016 INFO L93 Difference]: Finished difference Result 240 states and 244 transitions. [2018-12-03 19:27:16,016 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-12-03 19:27:16,016 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 111 [2018-12-03 19:27:16,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:16,017 INFO L225 Difference]: With dead ends: 240 [2018-12-03 19:27:16,017 INFO L226 Difference]: Without dead ends: 117 [2018-12-03 19:27:16,018 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 174 SyntacticMatches, 31 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1410 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1033, Invalid=3257, Unknown=0, NotChecked=0, Total=4290 [2018-12-03 19:27:16,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-12-03 19:27:16,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2018-12-03 19:27:16,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-12-03 19:27:16,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2018-12-03 19:27:16,033 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 111 [2018-12-03 19:27:16,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:16,034 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2018-12-03 19:27:16,034 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 19:27:16,034 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2018-12-03 19:27:16,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-12-03 19:27:16,034 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:16,034 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 1, 1, 1, 1, 1] [2018-12-03 19:27:16,035 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:16,035 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:16,035 INFO L82 PathProgramCache]: Analyzing trace with hash -2055366085, now seen corresponding path program 27 times [2018-12-03 19:27:16,035 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:16,036 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:16,036 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:16,036 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:16,036 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:16,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:16,858 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 15 proven. 826 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:16,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:16,858 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:16,858 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:16,858 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:16,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:16,858 INFO L192 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 [2018-12-03 19:27:16,867 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:27:16,867 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:27:16,887 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:27:16,888 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:16,890 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:17,603 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 15 proven. 826 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:17,604 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:17,692 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 15 proven. 826 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:17,710 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:17,710 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 52 [2018-12-03 19:27:17,711 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:17,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 19:27:17,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 19:27:17,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2618, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 19:27:17,712 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand 53 states. [2018-12-03 19:27:22,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:22,895 INFO L93 Difference]: Finished difference Result 244 states and 249 transitions. [2018-12-03 19:27:22,904 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 19:27:22,904 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 114 [2018-12-03 19:27:22,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:22,905 INFO L225 Difference]: With dead ends: 244 [2018-12-03 19:27:22,905 INFO L226 Difference]: Without dead ends: 182 [2018-12-03 19:27:22,906 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 207 SyntacticMatches, 3 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1130 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=539, Invalid=6601, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 19:27:22,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-12-03 19:27:22,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 119. [2018-12-03 19:27:22,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-12-03 19:27:22,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2018-12-03 19:27:22,929 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 114 [2018-12-03 19:27:22,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:22,929 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2018-12-03 19:27:22,929 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 19:27:22,929 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2018-12-03 19:27:22,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2018-12-03 19:27:22,930 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:22,930 INFO L402 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1] [2018-12-03 19:27:22,930 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:22,931 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:22,931 INFO L82 PathProgramCache]: Analyzing trace with hash 1833851874, now seen corresponding path program 28 times [2018-12-03 19:27:22,931 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:22,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:22,932 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:22,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:22,932 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:22,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:24,152 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 528 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:24,152 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:24,152 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:24,153 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:24,153 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:24,153 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:24,153 INFO L192 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 [2018-12-03 19:27:24,168 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:24,168 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:24,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:24,190 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:24,690 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 528 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:24,691 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:25,267 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 528 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:25,286 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:25,286 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 52 [2018-12-03 19:27:25,286 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:25,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 19:27:25,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 19:27:25,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 19:27:25,288 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand 53 states. [2018-12-03 19:27:26,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:26,197 INFO L93 Difference]: Finished difference Result 255 states and 259 transitions. [2018-12-03 19:27:26,197 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-12-03 19:27:26,197 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 118 [2018-12-03 19:27:26,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:26,198 INFO L225 Difference]: With dead ends: 255 [2018-12-03 19:27:26,199 INFO L226 Difference]: Without dead ends: 124 [2018-12-03 19:27:26,200 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 185 SyntacticMatches, 33 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1600 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1157, Invalid=3673, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 19:27:26,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-03 19:27:26,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 122. [2018-12-03 19:27:26,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-12-03 19:27:26,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 124 transitions. [2018-12-03 19:27:26,220 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 124 transitions. Word has length 118 [2018-12-03 19:27:26,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:26,220 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 124 transitions. [2018-12-03 19:27:26,221 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 19:27:26,221 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 124 transitions. [2018-12-03 19:27:26,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-12-03 19:27:26,221 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:26,221 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1] [2018-12-03 19:27:26,221 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:26,222 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:26,222 INFO L82 PathProgramCache]: Analyzing trace with hash 540940634, now seen corresponding path program 29 times [2018-12-03 19:27:26,222 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:26,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:26,223 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:26,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:26,223 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:26,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:27,138 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 16 proven. 937 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:27,138 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:27,139 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:27,139 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:27,139 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:27,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:27,139 INFO L192 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 [2018-12-03 19:27:27,148 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:27,148 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:27,180 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-03 19:27:27,181 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:27,183 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:29,135 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 512 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:29,135 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:31,137 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 496 proven. 457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:31,156 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:31,157 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 38, 38] total 93 [2018-12-03 19:27:31,157 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:31,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-12-03 19:27:31,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-12-03 19:27:31,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=995, Invalid=7747, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 19:27:31,158 INFO L87 Difference]: Start difference. First operand 122 states and 124 transitions. Second operand 75 states. [2018-12-03 19:27:41,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:41,531 INFO L93 Difference]: Finished difference Result 325 states and 331 transitions. [2018-12-03 19:27:41,532 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-12-03 19:27:41,532 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 121 [2018-12-03 19:27:41,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:41,534 INFO L225 Difference]: With dead ends: 325 [2018-12-03 19:27:41,534 INFO L226 Difference]: Without dead ends: 190 [2018-12-03 19:27:41,536 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 167 SyntacticMatches, 18 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8265 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=3055, Invalid=35165, Unknown=0, NotChecked=0, Total=38220 [2018-12-03 19:27:41,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-12-03 19:27:41,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 129. [2018-12-03 19:27:41,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-12-03 19:27:41,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 131 transitions. [2018-12-03 19:27:41,558 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 131 transitions. Word has length 121 [2018-12-03 19:27:41,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:41,559 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 131 transitions. [2018-12-03 19:27:41,559 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-12-03 19:27:41,559 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 131 transitions. [2018-12-03 19:27:41,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-12-03 19:27:41,559 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:41,560 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 1, 1, 1, 1, 1] [2018-12-03 19:27:41,560 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:41,560 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:41,560 INFO L82 PathProgramCache]: Analyzing trace with hash -1991581943, now seen corresponding path program 30 times [2018-12-03 19:27:41,560 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:41,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:41,561 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:41,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:41,561 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:41,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:42,496 INFO L134 CoverageAnalysis]: Checked inductivity of 1072 backedges. 17 proven. 1055 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:42,496 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:42,496 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:42,497 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:42,497 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:42,497 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:42,497 INFO L192 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 [2018-12-03 19:27:42,506 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:27:42,506 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:27:42,538 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:27:42,538 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:42,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:43,587 INFO L134 CoverageAnalysis]: Checked inductivity of 1072 backedges. 17 proven. 1055 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:43,588 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:43,706 INFO L134 CoverageAnalysis]: Checked inductivity of 1072 backedges. 17 proven. 1055 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:43,725 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:43,725 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 58 [2018-12-03 19:27:43,725 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:43,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 19:27:43,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 19:27:43,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=3268, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 19:27:43,726 INFO L87 Difference]: Start difference. First operand 129 states and 131 transitions. Second operand 59 states. [2018-12-03 19:27:49,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:49,401 INFO L93 Difference]: Finished difference Result 274 states and 279 transitions. [2018-12-03 19:27:49,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 19:27:49,402 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 128 [2018-12-03 19:27:49,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:49,404 INFO L225 Difference]: With dead ends: 274 [2018-12-03 19:27:49,404 INFO L226 Difference]: Without dead ends: 204 [2018-12-03 19:27:49,405 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 233 SyntacticMatches, 3 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1414 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=641, Invalid=8289, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 19:27:49,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-12-03 19:27:49,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 133. [2018-12-03 19:27:49,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-12-03 19:27:49,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2018-12-03 19:27:49,427 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 128 [2018-12-03 19:27:49,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:49,427 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2018-12-03 19:27:49,427 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 19:27:49,427 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2018-12-03 19:27:49,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-12-03 19:27:49,428 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:49,428 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1] [2018-12-03 19:27:49,428 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:49,428 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:49,428 INFO L82 PathProgramCache]: Analyzing trace with hash -1942976080, now seen corresponding path program 31 times [2018-12-03 19:27:49,429 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:49,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:49,429 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:49,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:49,429 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:49,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:50,132 INFO L134 CoverageAnalysis]: Checked inductivity of 1143 backedges. 666 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:50,132 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:50,133 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:50,133 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:50,133 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:50,133 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:50,133 INFO L192 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 [2018-12-03 19:27:50,148 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:50,148 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:50,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:50,177 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:51,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1143 backedges. 666 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:51,079 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:51,522 INFO L134 CoverageAnalysis]: Checked inductivity of 1143 backedges. 666 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:51,540 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:51,541 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 58 [2018-12-03 19:27:51,541 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:51,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 19:27:51,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 19:27:51,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 19:27:51,542 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand 59 states. [2018-12-03 19:27:52,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:52,418 INFO L93 Difference]: Finished difference Result 285 states and 289 transitions. [2018-12-03 19:27:52,418 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-12-03 19:27:52,418 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 132 [2018-12-03 19:27:52,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:52,420 INFO L225 Difference]: With dead ends: 285 [2018-12-03 19:27:52,420 INFO L226 Difference]: Without dead ends: 138 [2018-12-03 19:27:52,421 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 207 SyntacticMatches, 37 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2016 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1426, Invalid=4580, Unknown=0, NotChecked=0, Total=6006 [2018-12-03 19:27:52,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-12-03 19:27:52,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2018-12-03 19:27:52,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-12-03 19:27:52,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 138 transitions. [2018-12-03 19:27:52,447 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 138 transitions. Word has length 132 [2018-12-03 19:27:52,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:52,447 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 138 transitions. [2018-12-03 19:27:52,447 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 19:27:52,447 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 138 transitions. [2018-12-03 19:27:52,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-12-03 19:27:52,448 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:52,448 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1] [2018-12-03 19:27:52,448 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:52,448 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:52,448 INFO L82 PathProgramCache]: Analyzing trace with hash 220943656, now seen corresponding path program 32 times [2018-12-03 19:27:52,449 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:52,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:52,449 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:52,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:52,449 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:52,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:53,634 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 18 proven. 1180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:53,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:53,634 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:53,634 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:53,634 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:53,635 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:53,635 INFO L192 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 [2018-12-03 19:27:53,643 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:53,644 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:53,679 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-12-03 19:27:53,680 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:53,683 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:56,313 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 648 proven. 550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:56,313 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:58,528 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 630 proven. 568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:58,547 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:58,547 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 42, 42] total 103 [2018-12-03 19:27:58,547 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:58,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 19:27:58,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 19:27:58,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1204, Invalid=9508, Unknown=0, NotChecked=0, Total=10712 [2018-12-03 19:27:58,549 INFO L87 Difference]: Start difference. First operand 136 states and 138 transitions. Second operand 83 states. [2018-12-03 19:28:09,486 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2018-12-03 19:28:09,778 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2018-12-03 19:28:10,996 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2018-12-03 19:28:12,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:12,446 INFO L93 Difference]: Finished difference Result 363 states and 369 transitions. [2018-12-03 19:28:12,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2018-12-03 19:28:12,447 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 135 [2018-12-03 19:28:12,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:12,449 INFO L225 Difference]: With dead ends: 363 [2018-12-03 19:28:12,449 INFO L226 Difference]: Without dead ends: 212 [2018-12-03 19:28:12,452 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 187 SyntacticMatches, 20 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10242 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=3677, Invalid=43629, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 19:28:12,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2018-12-03 19:28:12,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 143. [2018-12-03 19:28:12,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2018-12-03 19:28:12,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2018-12-03 19:28:12,483 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 135 [2018-12-03 19:28:12,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:12,484 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2018-12-03 19:28:12,484 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 19:28:12,484 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2018-12-03 19:28:12,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2018-12-03 19:28:12,485 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:12,485 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 1, 1, 1, 1, 1] [2018-12-03 19:28:12,485 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:12,485 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:12,485 INFO L82 PathProgramCache]: Analyzing trace with hash 847427031, now seen corresponding path program 33 times [2018-12-03 19:28:12,485 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:12,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:12,486 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:12,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:12,486 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:12,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:13,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1331 backedges. 19 proven. 1312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:13,810 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:13,810 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:13,811 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:13,811 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:13,811 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:13,811 INFO L192 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 [2018-12-03 19:28:13,835 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:28:13,835 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:28:13,868 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:28:13,868 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:13,872 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:15,028 INFO L134 CoverageAnalysis]: Checked inductivity of 1331 backedges. 19 proven. 1312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:15,028 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:15,151 INFO L134 CoverageAnalysis]: Checked inductivity of 1331 backedges. 19 proven. 1312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:15,169 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:15,169 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 64 [2018-12-03 19:28:15,169 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:15,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 19:28:15,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 19:28:15,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3990, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 19:28:15,171 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand 65 states. [2018-12-03 19:28:19,472 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2018-12-03 19:28:19,746 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2018-12-03 19:28:22,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:22,026 INFO L93 Difference]: Finished difference Result 304 states and 309 transitions. [2018-12-03 19:28:22,026 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 19:28:22,027 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 142 [2018-12-03 19:28:22,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:22,028 INFO L225 Difference]: With dead ends: 304 [2018-12-03 19:28:22,028 INFO L226 Difference]: Without dead ends: 226 [2018-12-03 19:28:22,029 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 [2018-12-03 19:28:22,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2018-12-03 19:28:22,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 147. [2018-12-03 19:28:22,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-12-03 19:28:22,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 149 transitions. [2018-12-03 19:28:22,058 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 149 transitions. Word has length 142 [2018-12-03 19:28:22,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:22,059 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 149 transitions. [2018-12-03 19:28:22,059 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 19:28:22,059 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 149 transitions. [2018-12-03 19:28:22,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-12-03 19:28:22,060 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:22,060 INFO L402 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1] [2018-12-03 19:28:22,060 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:22,060 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:22,060 INFO L82 PathProgramCache]: Analyzing trace with hash -1796978306, now seen corresponding path program 34 times [2018-12-03 19:28:22,061 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:22,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:22,061 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:22,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:22,062 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:22,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:23,165 INFO L134 CoverageAnalysis]: Checked inductivity of 1410 backedges. 820 proven. 590 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:23,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:23,165 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:23,165 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:23,166 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:23,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:23,166 INFO L192 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 [2018-12-03 19:28:23,175 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:28:23,175 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:28:23,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:23,206 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:23,995 INFO L134 CoverageAnalysis]: Checked inductivity of 1410 backedges. 820 proven. 590 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:23,995 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:24,523 INFO L134 CoverageAnalysis]: Checked inductivity of 1410 backedges. 820 proven. 590 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:24,543 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:24,544 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 64 [2018-12-03 19:28:24,544 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:24,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 19:28:24,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 19:28:24,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 19:28:24,545 INFO L87 Difference]: Start difference. First operand 147 states and 149 transitions. Second operand 65 states. [2018-12-03 19:28:25,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:25,852 INFO L93 Difference]: Finished difference Result 315 states and 319 transitions. [2018-12-03 19:28:25,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-03 19:28:25,853 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 146 [2018-12-03 19:28:25,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:25,854 INFO L225 Difference]: With dead ends: 315 [2018-12-03 19:28:25,854 INFO L226 Difference]: Without dead ends: 152 [2018-12-03 19:28:25,855 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 229 SyntacticMatches, 41 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2480 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1723, Invalid=5587, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 19:28:25,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-12-03 19:28:25,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 150. [2018-12-03 19:28:25,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-12-03 19:28:25,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 152 transitions. [2018-12-03 19:28:25,892 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 152 transitions. Word has length 146 [2018-12-03 19:28:25,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:25,892 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 152 transitions. [2018-12-03 19:28:25,892 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 19:28:25,893 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 152 transitions. [2018-12-03 19:28:25,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-12-03 19:28:25,893 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:25,893 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1] [2018-12-03 19:28:25,894 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:25,894 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:25,894 INFO L82 PathProgramCache]: Analyzing trace with hash -193355018, now seen corresponding path program 35 times [2018-12-03 19:28:25,894 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:25,895 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:25,895 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:28:25,895 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:25,895 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:25,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:27,547 INFO L134 CoverageAnalysis]: Checked inductivity of 1471 backedges. 20 proven. 1451 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:27,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:27,547 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:27,547 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:27,548 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:27,548 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:27,548 INFO L192 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 [2018-12-03 19:28:27,558 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:28:27,558 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:28:27,845 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-12-03 19:28:27,845 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:27,849 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:30,752 INFO L134 CoverageAnalysis]: Checked inductivity of 1471 backedges. 800 proven. 671 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:30,752 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:33,590 INFO L134 CoverageAnalysis]: Checked inductivity of 1471 backedges. 780 proven. 691 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:33,609 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:33,609 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 46, 46] total 113 [2018-12-03 19:28:33,609 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:33,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2018-12-03 19:28:33,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2018-12-03 19:28:33,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=11449, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 19:28:33,611 INFO L87 Difference]: Start difference. First operand 150 states and 152 transitions. Second operand 91 states. [2018-12-03 19:28:45,308 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2018-12-03 19:28:45,623 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2018-12-03 19:28:45,938 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2018-12-03 19:28:46,215 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:28:47,035 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2018-12-03 19:28:48,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:48,961 INFO L93 Difference]: Finished difference Result 401 states and 407 transitions. [2018-12-03 19:28:48,962 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2018-12-03 19:28:48,962 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 149 [2018-12-03 19:28:48,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:48,964 INFO L225 Difference]: With dead ends: 401 [2018-12-03 19:28:48,964 INFO L226 Difference]: Without dead ends: 234 [2018-12-03 19:28:48,967 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 207 SyntacticMatches, 22 SemanticMatches, 238 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12431 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=4355, Invalid=53005, Unknown=0, NotChecked=0, Total=57360 [2018-12-03 19:28:48,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2018-12-03 19:28:48,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 157. [2018-12-03 19:28:48,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-12-03 19:28:48,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2018-12-03 19:28:48,994 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 149 [2018-12-03 19:28:48,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:48,994 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2018-12-03 19:28:48,995 INFO L481 AbstractCegarLoop]: Interpolant automaton has 91 states. [2018-12-03 19:28:48,995 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2018-12-03 19:28:48,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-12-03 19:28:48,995 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:48,996 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 1, 1, 1, 1, 1] [2018-12-03 19:28:48,996 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:48,996 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:48,996 INFO L82 PathProgramCache]: Analyzing trace with hash 1380130469, now seen corresponding path program 36 times [2018-12-03 19:28:48,996 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:48,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:48,997 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:48,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:48,997 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:49,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:51,659 INFO L134 CoverageAnalysis]: Checked inductivity of 1618 backedges. 21 proven. 1597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:51,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:51,660 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:51,660 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:51,660 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:51,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:51,660 INFO L192 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 [2018-12-03 19:28:51,670 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:28:51,670 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:28:51,698 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:28:51,698 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:51,702 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:53,717 INFO L134 CoverageAnalysis]: Checked inductivity of 1618 backedges. 21 proven. 1597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:53,718 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:53,887 INFO L134 CoverageAnalysis]: Checked inductivity of 1618 backedges. 21 proven. 1597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:28:53,909 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:53,909 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 70 [2018-12-03 19:28:53,909 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:53,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 19:28:53,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 19:28:53,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=4784, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 19:28:53,910 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand 71 states. [2018-12-03 19:28:59,737 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2018-12-03 19:29:00,049 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2018-12-03 19:29:00,354 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2018-12-03 19:29:00,555 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 19:29:00,743 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:29:02,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:02,883 INFO L93 Difference]: Finished difference Result 334 states and 339 transitions. [2018-12-03 19:29:02,883 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 19:29:02,884 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 156 [2018-12-03 19:29:02,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:02,885 INFO L225 Difference]: With dead ends: 334 [2018-12-03 19:29:02,885 INFO L226 Difference]: Without dead ends: 248 [2018-12-03 19:29:02,885 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 285 SyntacticMatches, 3 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2078 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=869, Invalid=12241, Unknown=0, NotChecked=0, Total=13110 [2018-12-03 19:29:02,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2018-12-03 19:29:02,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 161. [2018-12-03 19:29:02,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2018-12-03 19:29:02,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 163 transitions. [2018-12-03 19:29:02,921 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 163 transitions. Word has length 156 [2018-12-03 19:29:02,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:02,921 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 163 transitions. [2018-12-03 19:29:02,921 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 19:29:02,921 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 163 transitions. [2018-12-03 19:29:02,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2018-12-03 19:29:02,922 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:02,922 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1] [2018-12-03 19:29:02,922 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:02,922 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:02,922 INFO L82 PathProgramCache]: Analyzing trace with hash -1719166132, now seen corresponding path program 37 times [2018-12-03 19:29:02,922 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:02,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:02,923 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:29:02,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:02,923 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:02,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:04,445 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 990 proven. 715 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:04,445 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:04,445 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:04,445 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:04,446 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:04,446 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:04,446 INFO L192 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 [2018-12-03 19:29:04,456 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:29:04,457 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:29:04,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:04,490 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:05,356 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 990 proven. 715 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:05,357 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:06,004 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 990 proven. 715 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:06,024 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:06,024 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 70 [2018-12-03 19:29:06,024 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:06,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 19:29:06,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 19:29:06,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 19:29:06,025 INFO L87 Difference]: Start difference. First operand 161 states and 163 transitions. Second operand 71 states. [2018-12-03 19:29:07,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:07,871 INFO L93 Difference]: Finished difference Result 345 states and 349 transitions. [2018-12-03 19:29:07,873 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-12-03 19:29:07,873 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 160 [2018-12-03 19:29:07,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:07,874 INFO L225 Difference]: With dead ends: 345 [2018-12-03 19:29:07,874 INFO L226 Difference]: Without dead ends: 166 [2018-12-03 19:29:07,875 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 251 SyntacticMatches, 45 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2992 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2048, Invalid=6694, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 19:29:07,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-12-03 19:29:07,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 164. [2018-12-03 19:29:07,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-12-03 19:29:07,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 166 transitions. [2018-12-03 19:29:07,904 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 166 transitions. Word has length 160 [2018-12-03 19:29:07,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:07,904 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 166 transitions. [2018-12-03 19:29:07,904 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 19:29:07,904 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 166 transitions. [2018-12-03 19:29:07,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-12-03 19:29:07,905 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:07,905 INFO L402 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1] [2018-12-03 19:29:07,905 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:07,905 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:07,905 INFO L82 PathProgramCache]: Analyzing trace with hash -148438332, now seen corresponding path program 38 times [2018-12-03 19:29:07,905 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:07,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:07,906 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:29:07,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:07,906 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:07,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:09,711 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 22 proven. 1750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:09,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:09,711 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:09,711 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:09,711 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:09,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:09,711 INFO L192 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 [2018-12-03 19:29:09,720 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:29:09,720 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:29:09,805 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 19:29:09,806 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:29:09,809 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:11,178 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 22 proven. 1750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:11,178 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:11,325 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 22 proven. 1750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:11,344 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:11,345 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48, 48] total 73 [2018-12-03 19:29:11,345 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:11,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-03 19:29:11,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-03 19:29:11,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=5208, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 19:29:11,346 INFO L87 Difference]: Start difference. First operand 164 states and 166 transitions. Second operand 74 states. [2018-12-03 19:29:18,479 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2018-12-03 19:29:18,814 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2018-12-03 19:29:19,144 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2018-12-03 19:29:19,358 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 19:29:19,562 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 19:29:19,752 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:29:21,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:21,919 INFO L93 Difference]: Finished difference Result 349 states and 354 transitions. [2018-12-03 19:29:21,919 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 19:29:21,919 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 163 [2018-12-03 19:29:21,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:21,921 INFO L225 Difference]: With dead ends: 349 [2018-12-03 19:29:21,922 INFO L226 Difference]: Without dead ends: 259 [2018-12-03 19:29:21,923 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 298 SyntacticMatches, 3 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2264 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=931, Invalid=13349, Unknown=0, NotChecked=0, Total=14280 [2018-12-03 19:29:21,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2018-12-03 19:29:21,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 168. [2018-12-03 19:29:21,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-12-03 19:29:21,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 170 transitions. [2018-12-03 19:29:21,965 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 170 transitions. Word has length 163 [2018-12-03 19:29:21,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:21,965 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 170 transitions. [2018-12-03 19:29:21,966 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-03 19:29:21,966 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 170 transitions. [2018-12-03 19:29:21,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-12-03 19:29:21,966 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:21,966 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1] [2018-12-03 19:29:21,967 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:21,967 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:21,967 INFO L82 PathProgramCache]: Analyzing trace with hash -1550952469, now seen corresponding path program 39 times [2018-12-03 19:29:21,967 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:21,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:21,968 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:29:21,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:21,968 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:21,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:23,168 INFO L134 CoverageAnalysis]: Checked inductivity of 1863 backedges. 1081 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:23,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:23,169 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:23,169 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:23,169 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:23,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:23,169 INFO L192 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 [2018-12-03 19:29:23,179 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:29:23,179 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:29:23,204 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:29:23,204 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:29:23,207 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:24,186 INFO L134 CoverageAnalysis]: Checked inductivity of 1863 backedges. 1081 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:24,186 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:24,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1863 backedges. 1081 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:24,894 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:24,895 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 73 [2018-12-03 19:29:24,895 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:24,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-03 19:29:24,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-03 19:29:24,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 19:29:24,896 INFO L87 Difference]: Start difference. First operand 168 states and 170 transitions. Second operand 74 states. [2018-12-03 19:29:26,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:26,655 INFO L93 Difference]: Finished difference Result 360 states and 364 transitions. [2018-12-03 19:29:26,655 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-12-03 19:29:26,655 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 167 [2018-12-03 19:29:26,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:26,657 INFO L225 Difference]: With dead ends: 360 [2018-12-03 19:29:26,657 INFO L226 Difference]: Without dead ends: 173 [2018-12-03 19:29:26,658 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 262 SyntacticMatches, 47 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3266 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2221, Invalid=7285, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 19:29:26,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2018-12-03 19:29:26,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 171. [2018-12-03 19:29:26,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-12-03 19:29:26,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 173 transitions. [2018-12-03 19:29:26,698 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 173 transitions. Word has length 167 [2018-12-03 19:29:26,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:26,698 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 173 transitions. [2018-12-03 19:29:26,698 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-03 19:29:26,698 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 173 transitions. [2018-12-03 19:29:26,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-12-03 19:29:26,699 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:26,699 INFO L402 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 1, 1, 1, 1, 1] [2018-12-03 19:29:26,699 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:26,700 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:26,700 INFO L82 PathProgramCache]: Analyzing trace with hash -810935949, now seen corresponding path program 40 times [2018-12-03 19:29:26,700 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:26,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:26,700 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:29:26,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:26,700 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:26,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:28,426 INFO L134 CoverageAnalysis]: Checked inductivity of 1933 backedges. 23 proven. 1910 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:28,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:28,427 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:28,427 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:28,427 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:28,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:28,427 INFO L192 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 [2018-12-03 19:29:28,436 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:29:28,436 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:29:28,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:28,474 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:30,190 INFO L134 CoverageAnalysis]: Checked inductivity of 1933 backedges. 23 proven. 1910 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:30,191 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:30,345 INFO L134 CoverageAnalysis]: Checked inductivity of 1933 backedges. 23 proven. 1910 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:30,364 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:30,365 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 76 [2018-12-03 19:29:30,365 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:30,365 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 19:29:30,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 19:29:30,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=5650, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 19:29:30,366 INFO L87 Difference]: Start difference. First operand 171 states and 173 transitions. Second operand 77 states. [2018-12-03 19:29:37,768 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 123 [2018-12-03 19:29:38,174 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 123 [2018-12-03 19:29:38,543 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2018-12-03 19:29:38,776 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 19:29:38,991 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 19:29:39,205 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 19:29:39,403 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:29:41,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:41,551 INFO L93 Difference]: Finished difference Result 364 states and 369 transitions. [2018-12-03 19:29:41,551 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 19:29:41,551 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 170 [2018-12-03 19:29:41,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:41,553 INFO L225 Difference]: With dead ends: 364 [2018-12-03 19:29:41,553 INFO L226 Difference]: Without dead ends: 270 [2018-12-03 19:29:41,554 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 311 SyntacticMatches, 3 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2458 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=995, Invalid=14505, Unknown=0, NotChecked=0, Total=15500 [2018-12-03 19:29:41,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2018-12-03 19:29:41,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 175. [2018-12-03 19:29:41,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-12-03 19:29:41,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 177 transitions. [2018-12-03 19:29:41,588 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 177 transitions. Word has length 170 [2018-12-03 19:29:41,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:41,588 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 177 transitions. [2018-12-03 19:29:41,588 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 19:29:41,588 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 177 transitions. [2018-12-03 19:29:41,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-12-03 19:29:41,589 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:41,589 INFO L402 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1] [2018-12-03 19:29:41,589 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:41,589 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:41,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1036484838, now seen corresponding path program 41 times [2018-12-03 19:29:41,589 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:41,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:41,590 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:29:41,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:41,590 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:41,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:43,733 INFO L134 CoverageAnalysis]: Checked inductivity of 2028 backedges. 1176 proven. 852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:43,733 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:43,733 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:43,733 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:43,734 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:43,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:43,734 INFO L192 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 [2018-12-03 19:29:43,755 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:29:43,755 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:29:43,867 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-12-03 19:29:43,867 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:29:43,871 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:45,150 INFO L134 CoverageAnalysis]: Checked inductivity of 2028 backedges. 1176 proven. 852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:45,151 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:45,902 INFO L134 CoverageAnalysis]: Checked inductivity of 2028 backedges. 1176 proven. 852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:45,921 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:45,921 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 76 [2018-12-03 19:29:45,921 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:45,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 19:29:45,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 19:29:45,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 19:29:45,922 INFO L87 Difference]: Start difference. First operand 175 states and 177 transitions. Second operand 77 states. [2018-12-03 19:29:47,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:47,745 INFO L93 Difference]: Finished difference Result 375 states and 379 transitions. [2018-12-03 19:29:47,746 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-12-03 19:29:47,746 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 174 [2018-12-03 19:29:47,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:47,747 INFO L225 Difference]: With dead ends: 375 [2018-12-03 19:29:47,747 INFO L226 Difference]: Without dead ends: 180 [2018-12-03 19:29:47,748 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 273 SyntacticMatches, 49 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3552 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=2401, Invalid=7901, Unknown=0, NotChecked=0, Total=10302 [2018-12-03 19:29:47,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-12-03 19:29:47,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 178. [2018-12-03 19:29:47,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-12-03 19:29:47,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 180 transitions. [2018-12-03 19:29:47,791 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 180 transitions. Word has length 174 [2018-12-03 19:29:47,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:47,791 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 180 transitions. [2018-12-03 19:29:47,791 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 19:29:47,791 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 180 transitions. [2018-12-03 19:29:47,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-12-03 19:29:47,792 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:47,792 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1] [2018-12-03 19:29:47,792 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:47,792 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:47,792 INFO L82 PathProgramCache]: Analyzing trace with hash -1003391854, now seen corresponding path program 42 times [2018-12-03 19:29:47,792 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:47,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:47,793 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:29:47,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:47,793 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:47,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:49,863 INFO L134 CoverageAnalysis]: Checked inductivity of 2101 backedges. 24 proven. 2077 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:49,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:49,863 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:49,863 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:49,864 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:49,864 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:49,864 INFO L192 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 [2018-12-03 19:29:49,873 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:29:49,874 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:29:49,903 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:29:49,903 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:29:49,906 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:51,576 INFO L134 CoverageAnalysis]: Checked inductivity of 2101 backedges. 24 proven. 2077 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:51,576 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:51,743 INFO L134 CoverageAnalysis]: Checked inductivity of 2101 backedges. 24 proven. 2077 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:29:51,763 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:51,763 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52, 52] total 79 [2018-12-03 19:29:51,764 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:51,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-12-03 19:29:51,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-12-03 19:29:51,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=6110, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 19:29:51,764 INFO L87 Difference]: Start difference. First operand 178 states and 180 transitions. Second operand 80 states. [2018-12-03 19:29:58,130 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2018-12-03 19:29:58,564 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2018-12-03 19:29:58,971 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 123 [2018-12-03 19:29:59,214 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 19:29:59,454 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 19:29:59,677 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 19:29:59,894 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 19:30:00,099 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:30:02,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:30:02,303 INFO L93 Difference]: Finished difference Result 379 states and 384 transitions. [2018-12-03 19:30:02,303 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2018-12-03 19:30:02,303 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 177 [2018-12-03 19:30:02,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:30:02,304 INFO L225 Difference]: With dead ends: 379 [2018-12-03 19:30:02,304 INFO L226 Difference]: Without dead ends: 281 [2018-12-03 19:30:02,305 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 324 SyntacticMatches, 3 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2660 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=1061, Invalid=15709, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 19:30:02,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2018-12-03 19:30:02,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 182. [2018-12-03 19:30:02,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-12-03 19:30:02,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 184 transitions. [2018-12-03 19:30:02,346 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 184 transitions. Word has length 177 [2018-12-03 19:30:02,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:30:02,347 INFO L480 AbstractCegarLoop]: Abstraction has 182 states and 184 transitions. [2018-12-03 19:30:02,347 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-12-03 19:30:02,347 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 184 transitions. [2018-12-03 19:30:02,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2018-12-03 19:30:02,347 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:30:02,347 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1] [2018-12-03 19:30:02,348 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:30:02,348 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:30:02,348 INFO L82 PathProgramCache]: Analyzing trace with hash 525284025, now seen corresponding path program 43 times [2018-12-03 19:30:02,348 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:30:02,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:02,349 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:30:02,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:02,349 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:30:02,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:03,329 INFO L134 CoverageAnalysis]: Checked inductivity of 2200 backedges. 1275 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:03,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:03,329 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:30:03,329 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:30:03,329 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:30:03,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:03,329 INFO L192 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 [2018-12-03 19:30:03,337 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:30:03,337 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:30:03,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:03,375 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:30:04,887 INFO L134 CoverageAnalysis]: Checked inductivity of 2200 backedges. 1275 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:04,887 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:30:05,870 INFO L134 CoverageAnalysis]: Checked inductivity of 2200 backedges. 1275 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:05,891 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:30:05,892 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 79 [2018-12-03 19:30:05,892 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:30:05,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-12-03 19:30:05,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-12-03 19:30:05,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 19:30:05,893 INFO L87 Difference]: Start difference. First operand 182 states and 184 transitions. Second operand 80 states. [2018-12-03 19:30:08,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:30:08,033 INFO L93 Difference]: Finished difference Result 390 states and 394 transitions. [2018-12-03 19:30:08,034 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-03 19:30:08,034 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 181 [2018-12-03 19:30:08,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:30:08,035 INFO L225 Difference]: With dead ends: 390 [2018-12-03 19:30:08,035 INFO L226 Difference]: Without dead ends: 187 [2018-12-03 19:30:08,036 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 439 GetRequests, 284 SyntacticMatches, 51 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3850 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=2588, Invalid=8542, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 19:30:08,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-12-03 19:30:08,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 185. [2018-12-03 19:30:08,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 185 states. [2018-12-03 19:30:08,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 187 transitions. [2018-12-03 19:30:08,088 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 187 transitions. Word has length 181 [2018-12-03 19:30:08,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:30:08,088 INFO L480 AbstractCegarLoop]: Abstraction has 185 states and 187 transitions. [2018-12-03 19:30:08,088 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-12-03 19:30:08,088 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 187 transitions. [2018-12-03 19:30:08,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2018-12-03 19:30:08,089 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:30:08,089 INFO L402 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 25, 1, 1, 1, 1, 1] [2018-12-03 19:30:08,089 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:30:08,090 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:30:08,090 INFO L82 PathProgramCache]: Analyzing trace with hash -1479170495, now seen corresponding path program 44 times [2018-12-03 19:30:08,090 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:30:08,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:08,091 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:30:08,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:08,091 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:30:08,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:10,673 INFO L134 CoverageAnalysis]: Checked inductivity of 2276 backedges. 25 proven. 2251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:10,673 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:10,673 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:30:10,674 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:30:10,674 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:30:10,674 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:10,674 INFO L192 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 [2018-12-03 19:30:10,682 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:30:10,683 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:30:10,735 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-12-03 19:30:10,735 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:30:10,740 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:30:15,235 INFO L134 CoverageAnalysis]: Checked inductivity of 2276 backedges. 1250 proven. 1026 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:15,235 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:30:19,522 INFO L134 CoverageAnalysis]: Checked inductivity of 2276 backedges. 1225 proven. 1051 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:19,540 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:30:19,541 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 56, 56] total 138 [2018-12-03 19:30:19,541 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:30:19,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 111 states [2018-12-03 19:30:19,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2018-12-03 19:30:19,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2093, Invalid=17089, Unknown=0, NotChecked=0, Total=19182 [2018-12-03 19:30:19,542 INFO L87 Difference]: Start difference. First operand 185 states and 187 transitions. Second operand 111 states. [2018-12-03 19:30:37,400 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2018-12-03 19:30:37,845 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2018-12-03 19:30:38,322 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2018-12-03 19:30:38,719 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 19:30:39,097 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 19:30:39,500 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 19:30:39,873 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 19:30:40,204 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 19:30:40,518 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:30:43,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:30:43,678 INFO L93 Difference]: Finished difference Result 496 states and 502 transitions. [2018-12-03 19:30:43,678 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 184 states. [2018-12-03 19:30:43,679 INFO L78 Accepts]: Start accepts. Automaton has 111 states. Word has length 184 [2018-12-03 19:30:43,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:30:43,680 INFO L225 Difference]: With dead ends: 496 [2018-12-03 19:30:43,681 INFO L226 Difference]: Without dead ends: 289 [2018-12-03 19:30:43,684 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 577 GetRequests, 257 SyntacticMatches, 27 SemanticMatches, 293 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18831 ImplicationChecksByTransitivity, 28.8s TimeCoverageRelationStatistics Valid=6295, Invalid=80435, Unknown=0, NotChecked=0, Total=86730 [2018-12-03 19:30:43,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2018-12-03 19:30:43,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 192. [2018-12-03 19:30:43,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-12-03 19:30:43,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 194 transitions. [2018-12-03 19:30:43,724 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 194 transitions. Word has length 184 [2018-12-03 19:30:43,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:30:43,724 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 194 transitions. [2018-12-03 19:30:43,724 INFO L481 AbstractCegarLoop]: Interpolant automaton has 111 states. [2018-12-03 19:30:43,724 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 194 transitions. [2018-12-03 19:30:43,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-12-03 19:30:43,725 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:30:43,725 INFO L402 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 26, 26, 26, 1, 1, 1, 1, 1] [2018-12-03 19:30:43,725 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:30:43,725 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:30:43,726 INFO L82 PathProgramCache]: Analyzing trace with hash -1734936480, now seen corresponding path program 45 times [2018-12-03 19:30:43,726 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:30:43,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:43,726 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:30:43,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:43,727 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:30:43,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:46,128 INFO L134 CoverageAnalysis]: Checked inductivity of 2458 backedges. 26 proven. 2432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:46,128 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:46,128 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:30:46,129 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:30:46,129 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:30:46,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:46,129 INFO L192 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 [2018-12-03 19:30:46,137 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:30:46,137 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:30:46,165 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:30:46,165 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:30:46,169 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:30:48,059 INFO L134 CoverageAnalysis]: Checked inductivity of 2458 backedges. 26 proven. 2432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:48,060 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:30:48,379 INFO L134 CoverageAnalysis]: Checked inductivity of 2458 backedges. 26 proven. 2432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:30:48,398 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:30:48,398 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56, 56] total 85 [2018-12-03 19:30:48,398 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:30:48,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-03 19:30:48,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-03 19:30:48,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=7084, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 19:30:48,399 INFO L87 Difference]: Start difference. First operand 192 states and 194 transitions. Second operand 86 states. [2018-12-03 19:30:56,992 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-12-03 19:30:57,428 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-12-03 19:30:57,822 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2018-12-03 19:30:58,097 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 19:30:58,356 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 19:30:58,612 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 19:30:58,853 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 19:30:59,092 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 19:30:59,317 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 19:30:59,542 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:31:00,011 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2018-12-03 19:31:00,256 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2018-12-03 19:31:01,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:01,990 INFO L93 Difference]: Finished difference Result 409 states and 414 transitions. [2018-12-03 19:31:01,990 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-12-03 19:31:01,990 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 191 [2018-12-03 19:31:01,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:01,991 INFO L225 Difference]: With dead ends: 409 [2018-12-03 19:31:01,991 INFO L226 Difference]: Without dead ends: 303 [2018-12-03 19:31:01,993 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 350 SyntacticMatches, 3 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3088 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=1199, Invalid=18261, Unknown=0, NotChecked=0, Total=19460 [2018-12-03 19:31:01,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2018-12-03 19:31:02,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 196. [2018-12-03 19:31:02,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-12-03 19:31:02,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 198 transitions. [2018-12-03 19:31:02,038 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 198 transitions. Word has length 191 [2018-12-03 19:31:02,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:02,039 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 198 transitions. [2018-12-03 19:31:02,039 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-03 19:31:02,039 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 198 transitions. [2018-12-03 19:31:02,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-12-03 19:31:02,039 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:02,040 INFO L402 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1] [2018-12-03 19:31:02,040 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:02,040 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:02,040 INFO L82 PathProgramCache]: Analyzing trace with hash 2056396679, now seen corresponding path program 46 times [2018-12-03 19:31:02,040 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:02,041 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:02,041 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:31:02,041 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:02,041 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:02,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:03,927 INFO L134 CoverageAnalysis]: Checked inductivity of 2565 backedges. 1485 proven. 1080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:03,928 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:03,928 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:03,928 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:03,928 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:03,928 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:03,928 INFO L192 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 [2018-12-03 19:31:03,936 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:31:03,936 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:31:03,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:03,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:31:07,515 INFO L134 CoverageAnalysis]: Checked inductivity of 2565 backedges. 1485 proven. 1080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:07,516 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:31:08,471 INFO L134 CoverageAnalysis]: Checked inductivity of 2565 backedges. 1485 proven. 1080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:08,491 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:31:08,491 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 85 [2018-12-03 19:31:08,492 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:31:08,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-03 19:31:08,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-03 19:31:08,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 19:31:08,493 INFO L87 Difference]: Start difference. First operand 196 states and 198 transitions. Second operand 86 states. [2018-12-03 19:31:11,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:11,013 INFO L93 Difference]: Finished difference Result 420 states and 424 transitions. [2018-12-03 19:31:11,018 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-12-03 19:31:11,019 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 195 [2018-12-03 19:31:11,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:11,019 INFO L225 Difference]: With dead ends: 420 [2018-12-03 19:31:11,020 INFO L226 Difference]: Without dead ends: 201 [2018-12-03 19:31:11,020 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 306 SyntacticMatches, 55 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4482 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=2983, Invalid=9899, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 19:31:11,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2018-12-03 19:31:11,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 199. [2018-12-03 19:31:11,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-12-03 19:31:11,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 201 transitions. [2018-12-03 19:31:11,063 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 201 transitions. Word has length 195 [2018-12-03 19:31:11,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:11,063 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 201 transitions. [2018-12-03 19:31:11,063 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-03 19:31:11,063 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 201 transitions. [2018-12-03 19:31:11,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2018-12-03 19:31:11,064 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:11,064 INFO L402 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 27, 1, 1, 1, 1, 1] [2018-12-03 19:31:11,064 INFO L423 AbstractCegarLoop]: === Iteration 51 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:11,064 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:11,064 INFO L82 PathProgramCache]: Analyzing trace with hash -303839985, now seen corresponding path program 47 times [2018-12-03 19:31:11,064 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:11,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:11,065 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:31:11,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:11,065 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:11,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:13,554 INFO L134 CoverageAnalysis]: Checked inductivity of 2647 backedges. 27 proven. 2620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:13,555 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:13,555 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:13,555 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:13,555 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:13,555 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:13,555 INFO L192 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 [2018-12-03 19:31:13,564 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:31:13,564 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:31:13,620 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2018-12-03 19:31:13,620 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:31:13,624 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:31:15,872 INFO L134 CoverageAnalysis]: Checked inductivity of 2647 backedges. 27 proven. 2620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:15,873 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:31:16,059 INFO L134 CoverageAnalysis]: Checked inductivity of 2647 backedges. 27 proven. 2620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:16,079 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:31:16,079 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 88 [2018-12-03 19:31:16,079 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:31:16,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 19:31:16,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 19:31:16,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=7598, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 19:31:16,080 INFO L87 Difference]: Start difference. First operand 199 states and 201 transitions. Second operand 89 states. [2018-12-03 19:31:24,566 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2018-12-03 19:31:24,991 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2018-12-03 19:31:25,398 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-12-03 19:31:25,742 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 19:31:26,023 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 19:31:26,310 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 19:31:26,572 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 19:31:26,824 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 19:31:27,070 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 19:31:27,307 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 19:31:27,539 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:31:29,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:29,981 INFO L93 Difference]: Finished difference Result 424 states and 429 transitions. [2018-12-03 19:31:29,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2018-12-03 19:31:29,981 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 198 [2018-12-03 19:31:29,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:29,983 INFO L225 Difference]: With dead ends: 424 [2018-12-03 19:31:29,983 INFO L226 Difference]: Without dead ends: 314 [2018-12-03 19:31:29,984 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 363 SyntacticMatches, 3 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3314 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=1271, Invalid=19609, Unknown=0, NotChecked=0, Total=20880 [2018-12-03 19:31:29,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2018-12-03 19:31:30,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 203. [2018-12-03 19:31:30,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 203 states. [2018-12-03 19:31:30,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 205 transitions. [2018-12-03 19:31:30,036 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 205 transitions. Word has length 198 [2018-12-03 19:31:30,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:30,036 INFO L480 AbstractCegarLoop]: Abstraction has 203 states and 205 transitions. [2018-12-03 19:31:30,036 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 19:31:30,036 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 205 transitions. [2018-12-03 19:31:30,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2018-12-03 19:31:30,037 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:30,037 INFO L402 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 28, 28, 1, 1, 1, 1, 1] [2018-12-03 19:31:30,038 INFO L423 AbstractCegarLoop]: === Iteration 52 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:30,038 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:30,038 INFO L82 PathProgramCache]: Analyzing trace with hash -1908736842, now seen corresponding path program 48 times [2018-12-03 19:31:30,038 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:30,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:30,039 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:31:30,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:30,039 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:30,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:31,620 INFO L134 CoverageAnalysis]: Checked inductivity of 2758 backedges. 1596 proven. 1162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:31,620 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:31,620 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:31,620 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:31,620 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:31,620 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:31,620 INFO L192 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 [2018-12-03 19:31:31,628 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:31:31,629 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:31:31,661 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:31:31,661 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:31:31,664 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:31:33,032 INFO L134 CoverageAnalysis]: Checked inductivity of 2758 backedges. 1596 proven. 1162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:33,032 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:31:34,134 INFO L134 CoverageAnalysis]: Checked inductivity of 2758 backedges. 1596 proven. 1162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:34,153 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:31:34,153 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 88 [2018-12-03 19:31:34,153 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:31:34,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 19:31:34,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 19:31:34,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 19:31:34,155 INFO L87 Difference]: Start difference. First operand 203 states and 205 transitions. Second operand 89 states. [2018-12-03 19:31:36,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:36,761 INFO L93 Difference]: Finished difference Result 435 states and 439 transitions. [2018-12-03 19:31:36,761 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-12-03 19:31:36,761 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 202 [2018-12-03 19:31:36,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:36,763 INFO L225 Difference]: With dead ends: 435 [2018-12-03 19:31:36,763 INFO L226 Difference]: Without dead ends: 208 [2018-12-03 19:31:36,765 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 317 SyntacticMatches, 57 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4816 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3191, Invalid=10615, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 19:31:36,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-12-03 19:31:36,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 206. [2018-12-03 19:31:36,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2018-12-03 19:31:36,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 208 transitions. [2018-12-03 19:31:36,818 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 208 transitions. Word has length 202 [2018-12-03 19:31:36,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:36,819 INFO L480 AbstractCegarLoop]: Abstraction has 206 states and 208 transitions. [2018-12-03 19:31:36,819 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 19:31:36,819 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 208 transitions. [2018-12-03 19:31:36,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2018-12-03 19:31:36,820 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:36,820 INFO L402 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 28, 28, 28, 1, 1, 1, 1, 1] [2018-12-03 19:31:36,820 INFO L423 AbstractCegarLoop]: === Iteration 53 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:36,820 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:36,821 INFO L82 PathProgramCache]: Analyzing trace with hash 1062571566, now seen corresponding path program 49 times [2018-12-03 19:31:36,821 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:36,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:36,821 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:31:36,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:36,821 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:36,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:38,889 INFO L134 CoverageAnalysis]: Checked inductivity of 2843 backedges. 28 proven. 2815 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:38,890 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:38,890 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:38,890 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:38,890 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:38,890 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:38,890 INFO L192 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 [2018-12-03 19:31:38,901 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:31:38,901 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:31:38,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:38,944 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:31:41,368 INFO L134 CoverageAnalysis]: Checked inductivity of 2843 backedges. 28 proven. 2815 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:41,368 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:31:41,585 INFO L134 CoverageAnalysis]: Checked inductivity of 2843 backedges. 28 proven. 2815 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:41,604 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:31:41,604 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 60, 60] total 91 [2018-12-03 19:31:41,604 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:31:41,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-12-03 19:31:41,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-12-03 19:31:41,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=8130, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 19:31:41,606 INFO L87 Difference]: Start difference. First operand 206 states and 208 transitions. Second operand 92 states. [2018-12-03 19:31:50,590 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2018-12-03 19:31:51,038 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2018-12-03 19:31:51,550 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2018-12-03 19:31:51,854 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 19:31:52,156 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 19:31:52,451 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 19:31:52,733 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 19:31:52,998 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 19:31:53,253 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 19:31:53,498 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 19:31:53,738 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 19:31:53,960 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:31:56,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:56,603 INFO L93 Difference]: Finished difference Result 439 states and 444 transitions. [2018-12-03 19:31:56,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2018-12-03 19:31:56,604 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 205 [2018-12-03 19:31:56,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:56,605 INFO L225 Difference]: With dead ends: 439 [2018-12-03 19:31:56,606 INFO L226 Difference]: Without dead ends: 325 [2018-12-03 19:31:56,606 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 [2018-12-03 19:31:56,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2018-12-03 19:31:56,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 210. [2018-12-03 19:31:56,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-12-03 19:31:56,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 212 transitions. [2018-12-03 19:31:56,664 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 212 transitions. Word has length 205 [2018-12-03 19:31:56,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:56,664 INFO L480 AbstractCegarLoop]: Abstraction has 210 states and 212 transitions. [2018-12-03 19:31:56,664 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-12-03 19:31:56,664 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 212 transitions. [2018-12-03 19:31:56,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-12-03 19:31:56,665 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:56,666 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1] [2018-12-03 19:31:56,666 INFO L423 AbstractCegarLoop]: === Iteration 54 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:56,666 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:56,666 INFO L82 PathProgramCache]: Analyzing trace with hash -782950827, now seen corresponding path program 50 times [2018-12-03 19:31:56,666 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:56,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:56,667 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:31:56,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:56,667 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:56,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:57,955 INFO L134 CoverageAnalysis]: Checked inductivity of 2958 backedges. 1711 proven. 1247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:57,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:57,956 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:57,956 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:57,956 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:57,956 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:57,956 INFO L192 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 [2018-12-03 19:31:57,964 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:31:57,964 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:31:58,020 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-12-03 19:31:58,020 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:31:58,024 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:31:59,518 INFO L134 CoverageAnalysis]: Checked inductivity of 2958 backedges. 1711 proven. 1247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:31:59,518 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:32:00,714 INFO L134 CoverageAnalysis]: Checked inductivity of 2958 backedges. 1711 proven. 1247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:00,734 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:32:00,734 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 91 [2018-12-03 19:32:00,734 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:32:00,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-12-03 19:32:00,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-12-03 19:32:00,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 19:32:00,735 INFO L87 Difference]: Start difference. First operand 210 states and 212 transitions. Second operand 92 states. [2018-12-03 19:32:03,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:32:03,560 INFO L93 Difference]: Finished difference Result 450 states and 454 transitions. [2018-12-03 19:32:03,560 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-12-03 19:32:03,561 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 209 [2018-12-03 19:32:03,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:32:03,562 INFO L225 Difference]: With dead ends: 450 [2018-12-03 19:32:03,562 INFO L226 Difference]: Without dead ends: 215 [2018-12-03 19:32:03,563 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 328 SyntacticMatches, 59 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5162 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=3406, Invalid=11356, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 19:32:03,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2018-12-03 19:32:03,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 213. [2018-12-03 19:32:03,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-12-03 19:32:03,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 215 transitions. [2018-12-03 19:32:03,618 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 215 transitions. Word has length 209 [2018-12-03 19:32:03,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:32:03,618 INFO L480 AbstractCegarLoop]: Abstraction has 213 states and 215 transitions. [2018-12-03 19:32:03,618 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-12-03 19:32:03,618 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 215 transitions. [2018-12-03 19:32:03,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-12-03 19:32:03,619 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:32:03,619 INFO L402 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 29, 29, 29, 1, 1, 1, 1, 1] [2018-12-03 19:32:03,619 INFO L423 AbstractCegarLoop]: === Iteration 55 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:32:03,620 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:32:03,620 INFO L82 PathProgramCache]: Analyzing trace with hash -890079779, now seen corresponding path program 51 times [2018-12-03 19:32:03,620 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:32:03,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:03,620 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:32:03,621 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:03,621 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:32:03,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:32:05,819 INFO L134 CoverageAnalysis]: Checked inductivity of 3046 backedges. 29 proven. 3017 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:05,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:05,820 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:32:05,820 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:32:05,820 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:32:05,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:05,820 INFO L192 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 [2018-12-03 19:32:05,830 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:32:05,830 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:32:05,871 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:32:05,871 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:32:05,876 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:32:08,764 INFO L134 CoverageAnalysis]: Checked inductivity of 3046 backedges. 29 proven. 3017 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:08,765 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:32:09,007 INFO L134 CoverageAnalysis]: Checked inductivity of 3046 backedges. 29 proven. 3017 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:09,027 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:32:09,028 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 94 [2018-12-03 19:32:09,028 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:32:09,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 19:32:09,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 19:32:09,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=8680, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 19:32:09,029 INFO L87 Difference]: Start difference. First operand 213 states and 215 transitions. Second operand 95 states. [2018-12-03 19:32:19,399 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 153 [2018-12-03 19:32:19,863 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 153 [2018-12-03 19:32:20,311 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2018-12-03 19:32:20,630 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 19:32:20,930 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 19:32:21,250 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 19:32:21,540 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 19:32:21,871 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 19:32:22,179 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 19:32:22,446 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 19:32:22,696 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 19:32:22,938 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 19:32:23,174 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:32:25,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:32:25,747 INFO L93 Difference]: Finished difference Result 454 states and 459 transitions. [2018-12-03 19:32:25,748 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2018-12-03 19:32:25,748 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 212 [2018-12-03 19:32:25,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:32:25,751 INFO L225 Difference]: With dead ends: 454 [2018-12-03 19:32:25,751 INFO L226 Difference]: Without dead ends: 336 [2018-12-03 19:32:25,752 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 545 GetRequests, 389 SyntacticMatches, 3 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3790 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=1421, Invalid=22449, Unknown=0, NotChecked=0, Total=23870 [2018-12-03 19:32:25,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2018-12-03 19:32:25,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 217. [2018-12-03 19:32:25,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2018-12-03 19:32:25,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 219 transitions. [2018-12-03 19:32:25,809 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 219 transitions. Word has length 212 [2018-12-03 19:32:25,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:32:25,809 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 219 transitions. [2018-12-03 19:32:25,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 19:32:25,809 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 219 transitions. [2018-12-03 19:32:25,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2018-12-03 19:32:25,810 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:32:25,810 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 30, 30, 1, 1, 1, 1, 1] [2018-12-03 19:32:25,810 INFO L423 AbstractCegarLoop]: === Iteration 56 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:32:25,810 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:32:25,811 INFO L82 PathProgramCache]: Analyzing trace with hash -272066940, now seen corresponding path program 52 times [2018-12-03 19:32:25,811 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:32:25,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:25,811 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:32:25,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:25,811 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:32:25,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:32:27,608 INFO L134 CoverageAnalysis]: Checked inductivity of 3165 backedges. 1830 proven. 1335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:27,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:27,609 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:32:27,609 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:32:27,609 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:32:27,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:27,609 INFO L192 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 [2018-12-03 19:32:27,620 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:32:27,620 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:32:27,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:32:27,662 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:32:29,183 INFO L134 CoverageAnalysis]: Checked inductivity of 3165 backedges. 1830 proven. 1335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:29,183 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:32:30,360 INFO L134 CoverageAnalysis]: Checked inductivity of 3165 backedges. 1830 proven. 1335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:30,379 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:32:30,379 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 94 [2018-12-03 19:32:30,379 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:32:30,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 19:32:30,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 19:32:30,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 19:32:30,380 INFO L87 Difference]: Start difference. First operand 217 states and 219 transitions. Second operand 95 states. [2018-12-03 19:32:33,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:32:33,385 INFO L93 Difference]: Finished difference Result 465 states and 469 transitions. [2018-12-03 19:32:33,385 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-12-03 19:32:33,385 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 216 [2018-12-03 19:32:33,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:32:33,386 INFO L225 Difference]: With dead ends: 465 [2018-12-03 19:32:33,386 INFO L226 Difference]: Without dead ends: 222 [2018-12-03 19:32:33,387 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 524 GetRequests, 339 SyntacticMatches, 61 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5520 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=3628, Invalid=12122, Unknown=0, NotChecked=0, Total=15750 [2018-12-03 19:32:33,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-12-03 19:32:33,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 220. [2018-12-03 19:32:33,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2018-12-03 19:32:33,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 222 transitions. [2018-12-03 19:32:33,440 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 222 transitions. Word has length 216 [2018-12-03 19:32:33,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:32:33,440 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 222 transitions. [2018-12-03 19:32:33,440 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 19:32:33,440 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 222 transitions. [2018-12-03 19:32:33,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-12-03 19:32:33,441 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:32:33,441 INFO L402 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 30, 30, 30, 1, 1, 1, 1, 1] [2018-12-03 19:32:33,441 INFO L423 AbstractCegarLoop]: === Iteration 57 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:32:33,441 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:32:33,442 INFO L82 PathProgramCache]: Analyzing trace with hash 292238844, now seen corresponding path program 53 times [2018-12-03 19:32:33,442 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:32:33,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:33,442 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:32:33,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:33,442 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:32:33,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:32:35,785 INFO L134 CoverageAnalysis]: Checked inductivity of 3256 backedges. 30 proven. 3226 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:35,785 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:35,786 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:32:35,786 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:32:35,786 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:32:35,786 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:35,786 INFO L192 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 [2018-12-03 19:32:35,795 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:32:35,795 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:32:35,856 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-12-03 19:32:35,857 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:32:35,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:32:41,967 INFO L134 CoverageAnalysis]: Checked inductivity of 3256 backedges. 1800 proven. 1456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:41,968 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:32:47,849 INFO L134 CoverageAnalysis]: Checked inductivity of 3256 backedges. 1770 proven. 1486 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:32:47,868 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:32:47,869 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 66, 66] total 163 [2018-12-03 19:32:47,869 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:32:47,869 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2018-12-03 19:32:47,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2018-12-03 19:32:47,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2878, Invalid=23854, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 19:32:47,871 INFO L87 Difference]: Start difference. First operand 220 states and 222 transitions. Second operand 131 states. [2018-12-03 19:33:12,183 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2018-12-03 19:33:12,765 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2018-12-03 19:33:13,410 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 153 [2018-12-03 19:33:13,914 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 19:33:14,429 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 19:33:14,913 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 19:33:15,389 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 19:33:15,848 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 19:33:16,274 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 19:33:16,690 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 19:33:17,084 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 19:33:17,472 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 19:33:17,858 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 19:33:18,265 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:33:18,644 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-03 19:33:22,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:33:22,055 INFO L93 Difference]: Finished difference Result 591 states and 597 transitions. [2018-12-03 19:33:22,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 219 states. [2018-12-03 19:33:22,055 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 219 [2018-12-03 19:33:22,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:33:22,056 INFO L225 Difference]: With dead ends: 591 [2018-12-03 19:33:22,056 INFO L226 Difference]: Without dead ends: 344 [2018-12-03 19:33:22,059 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 687 GetRequests, 307 SyntacticMatches, 32 SemanticMatches, 348 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26556 ImplicationChecksByTransitivity, 39.3s TimeCoverageRelationStatistics Valid=8585, Invalid=113565, Unknown=0, NotChecked=0, Total=122150 [2018-12-03 19:33:22,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2018-12-03 19:33:22,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 227. [2018-12-03 19:33:22,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 227 states. [2018-12-03 19:33:22,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 229 transitions. [2018-12-03 19:33:22,112 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 229 transitions. Word has length 219 [2018-12-03 19:33:22,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:33:22,112 INFO L480 AbstractCegarLoop]: Abstraction has 227 states and 229 transitions. [2018-12-03 19:33:22,112 INFO L481 AbstractCegarLoop]: Interpolant automaton has 131 states. [2018-12-03 19:33:22,112 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 229 transitions. [2018-12-03 19:33:22,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2018-12-03 19:33:22,113 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:33:22,113 INFO L402 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 31, 31, 31, 1, 1, 1, 1, 1] [2018-12-03 19:33:22,113 INFO L423 AbstractCegarLoop]: === Iteration 58 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:33:22,114 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:33:22,114 INFO L82 PathProgramCache]: Analyzing trace with hash 2116008107, now seen corresponding path program 54 times [2018-12-03 19:33:22,114 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:33:22,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:22,114 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:33:22,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:22,115 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:33:22,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:24,793 INFO L134 CoverageAnalysis]: Checked inductivity of 3473 backedges. 31 proven. 3442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:24,794 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:24,794 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:33:24,794 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:33:24,794 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:33:24,794 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:24,794 INFO L192 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 [2018-12-03 19:33:24,804 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:33:24,805 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:33:24,841 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:33:24,842 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:33:24,846 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:33:27,415 INFO L134 CoverageAnalysis]: Checked inductivity of 3473 backedges. 31 proven. 3442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:27,416 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:33:27,653 INFO L134 CoverageAnalysis]: Checked inductivity of 3473 backedges. 31 proven. 3442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:27,673 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:33:27,673 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66, 66] total 100 [2018-12-03 19:33:27,673 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:33:27,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 19:33:27,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 19:33:27,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=9834, Unknown=0, NotChecked=0, Total=10100 [2018-12-03 19:33:27,675 INFO L87 Difference]: Start difference. First operand 227 states and 229 transitions. Second operand 101 states. [2018-12-03 19:33:40,954 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 163 [2018-12-03 19:33:41,466 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification that was a NOOP. DAG size: 163 [2018-12-03 19:33:41,976 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2018-12-03 19:33:42,322 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 19:33:42,663 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 19:33:42,984 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 19:33:43,327 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 19:33:43,648 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 19:33:44,007 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 19:33:44,317 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 19:33:44,609 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 19:33:44,898 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 19:33:45,170 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 19:33:45,430 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 19:33:45,688 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:33:48,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:33:48,434 INFO L93 Difference]: Finished difference Result 484 states and 489 transitions. [2018-12-03 19:33:48,434 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2018-12-03 19:33:48,435 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 226 [2018-12-03 19:33:48,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:33:48,436 INFO L225 Difference]: With dead ends: 484 [2018-12-03 19:33:48,436 INFO L226 Difference]: Without dead ends: 358 [2018-12-03 19:33:48,437 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 581 GetRequests, 415 SyntacticMatches, 3 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4298 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=1579, Invalid=25481, Unknown=0, NotChecked=0, Total=27060 [2018-12-03 19:33:48,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2018-12-03 19:33:48,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 231. [2018-12-03 19:33:48,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 231 states. [2018-12-03 19:33:48,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 233 transitions. [2018-12-03 19:33:48,496 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 233 transitions. Word has length 226 [2018-12-03 19:33:48,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:33:48,496 INFO L480 AbstractCegarLoop]: Abstraction has 231 states and 233 transitions. [2018-12-03 19:33:48,497 INFO L481 AbstractCegarLoop]: Interpolant automaton has 101 states. [2018-12-03 19:33:48,497 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 233 transitions. [2018-12-03 19:33:48,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2018-12-03 19:33:48,498 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:33:48,498 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 32, 32, 1, 1, 1, 1, 1] [2018-12-03 19:33:48,498 INFO L423 AbstractCegarLoop]: === Iteration 59 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:33:48,498 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:33:48,499 INFO L82 PathProgramCache]: Analyzing trace with hash -237256110, now seen corresponding path program 55 times [2018-12-03 19:33:48,499 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:33:48,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:48,499 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:33:48,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:48,500 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:33:48,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:50,284 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 2080 proven. 1520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:50,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:50,285 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:33:50,285 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:33:50,285 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:33:50,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:50,285 INFO L192 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 [2018-12-03 19:33:50,294 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:33:50,295 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:33:50,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:50,340 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:33:52,146 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 2080 proven. 1520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:52,146 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:33:53,710 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 2080 proven. 1520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:53,729 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:33:53,729 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 100 [2018-12-03 19:33:53,729 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:33:53,730 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 19:33:53,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 19:33:53,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2018-12-03 19:33:53,730 INFO L87 Difference]: Start difference. First operand 231 states and 233 transitions. Second operand 101 states. [2018-12-03 19:33:56,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:33:56,274 INFO L93 Difference]: Finished difference Result 495 states and 499 transitions. [2018-12-03 19:33:56,274 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-12-03 19:33:56,274 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 230 [2018-12-03 19:33:56,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:33:56,275 INFO L225 Difference]: With dead ends: 495 [2018-12-03 19:33:56,275 INFO L226 Difference]: Without dead ends: 236 [2018-12-03 19:33:56,279 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 558 GetRequests, 361 SyntacticMatches, 65 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6272 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 19:33:56,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2018-12-03 19:33:56,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 234. [2018-12-03 19:33:56,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2018-12-03 19:33:56,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 236 transitions. [2018-12-03 19:33:56,339 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 236 transitions. Word has length 230 [2018-12-03 19:33:56,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:33:56,339 INFO L480 AbstractCegarLoop]: Abstraction has 234 states and 236 transitions. [2018-12-03 19:33:56,339 INFO L481 AbstractCegarLoop]: Interpolant automaton has 101 states. [2018-12-03 19:33:56,339 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 236 transitions. [2018-12-03 19:33:56,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2018-12-03 19:33:56,340 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:33:56,340 INFO L402 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 32, 32, 32, 1, 1, 1, 1, 1] [2018-12-03 19:33:56,341 INFO L423 AbstractCegarLoop]: === Iteration 60 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:33:56,341 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:33:56,341 INFO L82 PathProgramCache]: Analyzing trace with hash -170528822, now seen corresponding path program 56 times [2018-12-03 19:33:56,341 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:33:56,342 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:56,342 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:33:56,342 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:56,342 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:33:56,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:59,015 INFO L134 CoverageAnalysis]: Checked inductivity of 3697 backedges. 32 proven. 3665 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:33:59,015 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:59,015 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:33:59,015 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:33:59,015 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:33:59,015 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:59,015 INFO L192 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 [2018-12-03 19:33:59,025 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:33:59,025 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:33:59,103 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-12-03 19:33:59,103 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:33:59,108 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:34:06,149 INFO L134 CoverageAnalysis]: Checked inductivity of 3697 backedges. 2048 proven. 1649 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:34:06,150 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:34:12,430 INFO L134 CoverageAnalysis]: Checked inductivity of 3697 backedges. 2016 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:34:12,449 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:34:12,450 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 70, 70] total 173 [2018-12-03 19:34:12,450 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:34:12,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 139 states [2018-12-03 19:34:12,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2018-12-03 19:34:12,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3227, Invalid=26875, Unknown=0, NotChecked=0, Total=30102 [2018-12-03 19:34:12,452 INFO L87 Difference]: Start difference. First operand 234 states and 236 transitions. Second operand 139 states. [2018-12-03 19:34:38,204 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification that was a NOOP. DAG size: 168 [2018-12-03 19:34:38,827 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 168 [2018-12-03 19:34:39,455 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 163 [2018-12-03 19:34:40,028 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 19:34:40,609 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 19:34:41,155 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 19:34:41,667 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 19:34:42,167 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 19:34:42,668 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 19:34:43,159 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 19:34:43,617 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 19:34:44,062 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 19:34:44,482 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 19:34:44,882 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 19:34:45,324 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 19:34:45,725 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:34:49,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:34:49,595 INFO L93 Difference]: Finished difference Result 629 states and 635 transitions. [2018-12-03 19:34:49,596 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 233 states. [2018-12-03 19:34:49,596 INFO L78 Accepts]: Start accepts. Automaton has 139 states. Word has length 233 [2018-12-03 19:34:49,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:34:49,597 INFO L225 Difference]: With dead ends: 629 [2018-12-03 19:34:49,597 INFO L226 Difference]: Without dead ends: 366 [2018-12-03 19:34:49,600 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 731 GetRequests, 327 SyntacticMatches, 34 SemanticMatches, 370 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30017 ImplicationChecksByTransitivity, 44.3s TimeCoverageRelationStatistics Valid=9599, Invalid=128413, Unknown=0, NotChecked=0, Total=138012 [2018-12-03 19:34:49,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2018-12-03 19:34:49,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 241. [2018-12-03 19:34:49,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2018-12-03 19:34:49,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 243 transitions. [2018-12-03 19:34:49,660 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 243 transitions. Word has length 233 [2018-12-03 19:34:49,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:34:49,660 INFO L480 AbstractCegarLoop]: Abstraction has 241 states and 243 transitions. [2018-12-03 19:34:49,660 INFO L481 AbstractCegarLoop]: Interpolant automaton has 139 states. [2018-12-03 19:34:49,660 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 243 transitions. [2018-12-03 19:34:49,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2018-12-03 19:34:49,661 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:34:49,661 INFO L402 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 33, 33, 33, 1, 1, 1, 1, 1] [2018-12-03 19:34:49,661 INFO L423 AbstractCegarLoop]: === Iteration 61 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:34:49,661 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:34:49,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1552518521, now seen corresponding path program 57 times [2018-12-03 19:34:49,662 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:34:49,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:49,662 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:34:49,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:49,663 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:34:49,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:34:52,627 INFO L134 CoverageAnalysis]: Checked inductivity of 3928 backedges. 33 proven. 3895 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:34:52,627 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:52,627 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:34:52,627 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:34:52,627 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:34:52,627 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:52,627 INFO L192 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 [2018-12-03 19:34:52,636 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:34:52,637 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:34:52,676 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:34:52,676 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:34:52,681 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:34:55,650 INFO L134 CoverageAnalysis]: Checked inductivity of 3928 backedges. 33 proven. 3895 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:34:55,650 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:34:55,936 INFO L134 CoverageAnalysis]: Checked inductivity of 3928 backedges. 33 proven. 3895 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:34:55,955 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:34:55,955 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70, 70] total 106 [2018-12-03 19:34:55,955 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:34:55,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-12-03 19:34:55,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-12-03 19:34:55,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=11060, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 19:34:55,956 INFO L87 Difference]: Start difference. First operand 241 states and 243 transitions. Second operand 107 states. [2018-12-03 19:35:07,974 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 173 [2018-12-03 19:35:08,517 WARN L180 SmtUtils]: Spent 228.00 ms on a formula simplification that was a NOOP. DAG size: 173 [2018-12-03 19:35:09,074 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 168 [2018-12-03 19:35:09,475 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-03 19:35:09,848 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 19:35:10,234 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 19:35:10,592 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 19:35:11,005 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 19:35:11,342 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 19:35:11,680 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 19:35:12,001 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 19:35:12,310 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 19:35:12,611 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 19:35:12,899 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 19:35:13,203 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 19:35:13,475 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 19:35:13,737 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:35:16,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:35:16,741 INFO L93 Difference]: Finished difference Result 514 states and 519 transitions. [2018-12-03 19:35:16,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2018-12-03 19:35:16,742 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 240 [2018-12-03 19:35:16,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:35:16,744 INFO L225 Difference]: With dead ends: 514 [2018-12-03 19:35:16,744 INFO L226 Difference]: Without dead ends: 380 [2018-12-03 19:35:16,745 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 617 GetRequests, 441 SyntacticMatches, 3 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4838 ImplicationChecksByTransitivity, 16.0s TimeCoverageRelationStatistics Valid=1745, Invalid=28705, Unknown=0, NotChecked=0, Total=30450 [2018-12-03 19:35:16,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2018-12-03 19:35:16,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 245. [2018-12-03 19:35:16,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245 states. [2018-12-03 19:35:16,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 247 transitions. [2018-12-03 19:35:16,809 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 247 transitions. Word has length 240 [2018-12-03 19:35:16,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:35:16,809 INFO L480 AbstractCegarLoop]: Abstraction has 245 states and 247 transitions. [2018-12-03 19:35:16,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-12-03 19:35:16,809 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 247 transitions. [2018-12-03 19:35:16,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2018-12-03 19:35:16,810 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:35:16,810 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 34, 34, 1, 1, 1, 1, 1] [2018-12-03 19:35:16,810 INFO L423 AbstractCegarLoop]: === Iteration 62 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:35:16,811 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:35:16,811 INFO L82 PathProgramCache]: Analyzing trace with hash 714244128, now seen corresponding path program 58 times [2018-12-03 19:35:16,811 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:35:16,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:16,811 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:35:16,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:16,811 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:35:16,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:35:18,414 INFO L134 CoverageAnalysis]: Checked inductivity of 4063 backedges. 2346 proven. 1717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:35:18,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:18,414 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:35:18,414 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:35:18,415 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:35:18,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:18,415 INFO L192 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 [2018-12-03 19:35:18,424 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:35:18,424 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:35:18,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:35:18,473 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:35:20,454 INFO L134 CoverageAnalysis]: Checked inductivity of 4063 backedges. 2346 proven. 1717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:35:20,454 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:35:22,273 INFO L134 CoverageAnalysis]: Checked inductivity of 4063 backedges. 2346 proven. 1717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:35:22,292 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:35:22,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 106 [2018-12-03 19:35:22,293 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:35:22,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-12-03 19:35:22,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-12-03 19:35:22,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 19:35:22,294 INFO L87 Difference]: Start difference. First operand 245 states and 247 transitions. Second operand 107 states. [2018-12-03 19:35:24,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:35:24,912 INFO L93 Difference]: Finished difference Result 525 states and 529 transitions. [2018-12-03 19:35:24,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-03 19:35:24,913 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 244 [2018-12-03 19:35:24,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:35:24,915 INFO L225 Difference]: With dead ends: 525 [2018-12-03 19:35:24,915 INFO L226 Difference]: Without dead ends: 250 [2018-12-03 19:35:24,916 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 383 SyntacticMatches, 69 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7072 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=4586, Invalid=15436, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 19:35:24,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2018-12-03 19:35:24,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 248. [2018-12-03 19:35:24,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2018-12-03 19:35:24,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 250 transitions. [2018-12-03 19:35:24,989 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 250 transitions. Word has length 244 [2018-12-03 19:35:24,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:35:24,989 INFO L480 AbstractCegarLoop]: Abstraction has 248 states and 250 transitions. [2018-12-03 19:35:24,989 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-12-03 19:35:24,989 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 250 transitions. [2018-12-03 19:35:24,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2018-12-03 19:35:24,990 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:35:24,990 INFO L402 BasicCegarLoop]: trace histogram [35, 35, 35, 35, 34, 34, 34, 1, 1, 1, 1, 1] [2018-12-03 19:35:24,991 INFO L423 AbstractCegarLoop]: === Iteration 63 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:35:24,991 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:35:24,991 INFO L82 PathProgramCache]: Analyzing trace with hash 1637071768, now seen corresponding path program 59 times [2018-12-03 19:35:24,991 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:35:24,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:24,992 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:35:24,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:24,992 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:35:25,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:35:28,143 INFO L134 CoverageAnalysis]: Checked inductivity of 4166 backedges. 34 proven. 4132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:35:28,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:28,143 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:35:28,143 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:35:28,143 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:35:28,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:28,144 INFO L192 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 [2018-12-03 19:35:28,154 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:35:28,154 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:35:28,227 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-12-03 19:35:28,227 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:35:28,231 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:35:35,814 INFO L134 CoverageAnalysis]: Checked inductivity of 4166 backedges. 2312 proven. 1854 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:35:35,814 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:35:43,154 INFO L134 CoverageAnalysis]: Checked inductivity of 4166 backedges. 2278 proven. 1888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:35:43,173 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:35:43,174 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 74, 74] total 183 [2018-12-03 19:35:43,174 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:35:43,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 147 states [2018-12-03 19:35:43,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2018-12-03 19:35:43,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3596, Invalid=30076, Unknown=0, NotChecked=0, Total=33672 [2018-12-03 19:35:43,176 INFO L87 Difference]: Start difference. First operand 248 states and 250 transitions. Second operand 147 states. [2018-12-03 19:36:11,253 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2018-12-03 19:36:11,905 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2018-12-03 19:36:12,681 WARN L180 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 173 [2018-12-03 19:36:13,307 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-03 19:36:13,897 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-03 19:36:14,499 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 19:36:15,083 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 19:36:15,635 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 19:36:16,182 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 19:36:16,725 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 19:36:17,235 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 19:36:17,767 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 19:36:18,259 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 19:36:18,755 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 19:36:19,210 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 19:36:19,640 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 19:36:20,051 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 19:36:20,468 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:36:24,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:36:24,703 INFO L93 Difference]: Finished difference Result 667 states and 673 transitions. [2018-12-03 19:36:24,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 247 states. [2018-12-03 19:36:24,704 INFO L78 Accepts]: Start accepts. Automaton has 147 states. Word has length 247 [2018-12-03 19:36:24,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:36:24,706 INFO L225 Difference]: With dead ends: 667 [2018-12-03 19:36:24,706 INFO L226 Difference]: Without dead ends: 388 [2018-12-03 19:36:24,710 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 775 GetRequests, 347 SyntacticMatches, 36 SemanticMatches, 392 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33690 ImplicationChecksByTransitivity, 50.2s TimeCoverageRelationStatistics Valid=10669, Invalid=144173, Unknown=0, NotChecked=0, Total=154842 [2018-12-03 19:36:24,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 388 states. [2018-12-03 19:36:24,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 388 to 255. [2018-12-03 19:36:24,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 255 states. [2018-12-03 19:36:24,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 257 transitions. [2018-12-03 19:36:24,780 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 257 transitions. Word has length 247 [2018-12-03 19:36:24,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:36:24,780 INFO L480 AbstractCegarLoop]: Abstraction has 255 states and 257 transitions. [2018-12-03 19:36:24,780 INFO L481 AbstractCegarLoop]: Interpolant automaton has 147 states. [2018-12-03 19:36:24,780 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 257 transitions. [2018-12-03 19:36:24,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2018-12-03 19:36:24,781 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:36:24,782 INFO L402 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 35, 35, 35, 1, 1, 1, 1, 1] [2018-12-03 19:36:24,782 INFO L423 AbstractCegarLoop]: === Iteration 64 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:36:24,782 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:36:24,782 INFO L82 PathProgramCache]: Analyzing trace with hash -783420345, now seen corresponding path program 60 times [2018-12-03 19:36:24,782 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:36:24,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:36:24,783 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:36:24,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:36:24,783 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:36:24,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:36:28,042 INFO L134 CoverageAnalysis]: Checked inductivity of 4411 backedges. 35 proven. 4376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:36:28,043 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:36:28,043 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:36:28,043 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:36:28,043 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:36:28,043 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:36:28,043 INFO L192 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 [2018-12-03 19:36:28,052 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:36:28,053 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:36:28,095 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:36:28,096 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:36:28,100 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:36:31,334 INFO L134 CoverageAnalysis]: Checked inductivity of 4411 backedges. 35 proven. 4376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:36:31,334 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:36:31,627 INFO L134 CoverageAnalysis]: Checked inductivity of 4411 backedges. 35 proven. 4376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:36:31,646 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:36:31,646 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 74, 74] total 112 [2018-12-03 19:36:31,646 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:36:31,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2018-12-03 19:36:31,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2018-12-03 19:36:31,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=12358, Unknown=0, NotChecked=0, Total=12656 [2018-12-03 19:36:31,648 INFO L87 Difference]: Start difference. First operand 255 states and 257 transitions. Second operand 113 states. [2018-12-03 19:36:45,868 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification that was a NOOP. DAG size: 183 [2018-12-03 19:36:46,450 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 183 [2018-12-03 19:36:47,060 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2018-12-03 19:36:47,474 WARN L180 SmtUtils]: Spent 226.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2018-12-03 19:36:47,889 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-03 19:36:48,335 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-03 19:36:48,724 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 19:36:49,106 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 19:36:49,488 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 19:36:49,844 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 19:36:50,194 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 19:36:50,535 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 19:36:50,861 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 19:36:51,176 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 19:36:51,495 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 19:36:51,809 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 19:36:52,105 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 19:36:52,394 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 19:36:52,664 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:36:53,201 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2018-12-03 19:36:53,515 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2018-12-03 19:36:55,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:36:55,779 INFO L93 Difference]: Finished difference Result 544 states and 549 transitions. [2018-12-03 19:36:55,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2018-12-03 19:36:55,780 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 254 [2018-12-03 19:36:55,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:36:55,782 INFO L225 Difference]: With dead ends: 544 [2018-12-03 19:36:55,782 INFO L226 Difference]: Without dead ends: 402 [2018-12-03 19:36:55,784 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 653 GetRequests, 467 SyntacticMatches, 3 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5410 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=1919, Invalid=32121, Unknown=0, NotChecked=0, Total=34040 [2018-12-03 19:36:55,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2018-12-03 19:36:55,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 259. [2018-12-03 19:36:55,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-12-03 19:36:55,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 261 transitions. [2018-12-03 19:36:55,855 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 261 transitions. Word has length 254 [2018-12-03 19:36:55,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:36:55,855 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 261 transitions. [2018-12-03 19:36:55,855 INFO L481 AbstractCegarLoop]: Interpolant automaton has 113 states. [2018-12-03 19:36:55,855 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 261 transitions. [2018-12-03 19:36:55,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-12-03 19:36:55,856 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:36:55,856 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 36, 36, 1, 1, 1, 1, 1] [2018-12-03 19:36:55,857 INFO L423 AbstractCegarLoop]: === Iteration 65 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:36:55,857 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:36:55,857 INFO L82 PathProgramCache]: Analyzing trace with hash 1175113710, now seen corresponding path program 61 times [2018-12-03 19:36:55,857 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:36:55,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:36:55,858 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:36:55,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:36:55,858 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:36:55,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:36:57,592 INFO L134 CoverageAnalysis]: Checked inductivity of 4554 backedges. 2628 proven. 1926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:36:57,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:36:57,593 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:36:57,593 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:36:57,593 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:36:57,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:36:57,593 INFO L192 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 [2018-12-03 19:36:57,604 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:36:57,604 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:36:57,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:36:57,656 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:37:00,068 INFO L134 CoverageAnalysis]: Checked inductivity of 4554 backedges. 2628 proven. 1926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:37:00,068 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:37:01,755 INFO L134 CoverageAnalysis]: Checked inductivity of 4554 backedges. 2628 proven. 1926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:37:01,774 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:37:01,775 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 112 [2018-12-03 19:37:01,775 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:37:01,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2018-12-03 19:37:01,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2018-12-03 19:37:01,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2018-12-03 19:37:01,776 INFO L87 Difference]: Start difference. First operand 259 states and 261 transitions. Second operand 113 states. [2018-12-03 19:37:04,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:37:04,940 INFO L93 Difference]: Finished difference Result 555 states and 559 transitions. [2018-12-03 19:37:04,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-12-03 19:37:04,941 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 258 [2018-12-03 19:37:04,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:37:04,943 INFO L225 Difference]: With dead ends: 555 [2018-12-03 19:37:04,943 INFO L226 Difference]: Without dead ends: 264 [2018-12-03 19:37:04,944 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 [2018-12-03 19:37:04,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2018-12-03 19:37:05,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 262. [2018-12-03 19:37:05,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2018-12-03 19:37:05,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 264 transitions. [2018-12-03 19:37:05,015 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 264 transitions. Word has length 258 [2018-12-03 19:37:05,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:37:05,015 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 264 transitions. [2018-12-03 19:37:05,015 INFO L481 AbstractCegarLoop]: Interpolant automaton has 113 states. [2018-12-03 19:37:05,015 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 264 transitions. [2018-12-03 19:37:05,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2018-12-03 19:37:05,016 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:37:05,016 INFO L402 BasicCegarLoop]: trace histogram [37, 37, 37, 37, 36, 36, 36, 1, 1, 1, 1, 1] [2018-12-03 19:37:05,016 INFO L423 AbstractCegarLoop]: === Iteration 66 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:37:05,017 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:37:05,017 INFO L82 PathProgramCache]: Analyzing trace with hash 1470273894, now seen corresponding path program 62 times [2018-12-03 19:37:05,017 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:37:05,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:37:05,018 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:37:05,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:37:05,018 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:37:05,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:37:08,254 INFO L134 CoverageAnalysis]: Checked inductivity of 4663 backedges. 36 proven. 4627 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:37:08,255 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:37:08,255 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:37:08,255 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:37:08,255 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:37:08,255 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:37:08,255 INFO L192 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 [2018-12-03 19:37:08,264 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:37:08,265 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:37:08,368 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-12-03 19:37:08,368 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:37:08,373 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:37:17,125 INFO L134 CoverageAnalysis]: Checked inductivity of 4663 backedges. 2592 proven. 2071 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:37:17,125 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:37:25,194 INFO L134 CoverageAnalysis]: Checked inductivity of 4663 backedges. 2556 proven. 2107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:37:25,213 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:37:25,213 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 78, 78] total 193 [2018-12-03 19:37:25,214 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:37:25,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 155 states [2018-12-03 19:37:25,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2018-12-03 19:37:25,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3985, Invalid=33457, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 19:37:25,216 INFO L87 Difference]: Start difference. First operand 262 states and 264 transitions. Second operand 155 states. [2018-12-03 19:37:54,778 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2018-12-03 19:37:56,871 WARN L180 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 188 [2018-12-03 19:37:57,605 WARN L180 SmtUtils]: Spent 246.00 ms on a formula simplification that was a NOOP. DAG size: 188 [2018-12-03 19:37:58,363 WARN L180 SmtUtils]: Spent 247.00 ms on a formula simplification that was a NOOP. DAG size: 183 [2018-12-03 19:37:59,046 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 179 [2018-12-03 19:37:59,738 WARN L180 SmtUtils]: Spent 252.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2018-12-03 19:38:00,419 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-03 19:38:01,068 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-03 19:38:01,691 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 19:38:02,278 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 19:38:02,859 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 19:38:03,425 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 19:38:03,976 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 19:38:04,507 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 19:38:05,105 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 19:38:05,616 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 19:38:06,098 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 19:38:06,572 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 19:38:07,029 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 19:38:07,459 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 19:38:07,869 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:38:12,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:38:12,317 INFO L93 Difference]: Finished difference Result 705 states and 711 transitions. [2018-12-03 19:38:12,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 261 states. [2018-12-03 19:38:12,317 INFO L78 Accepts]: Start accepts. Automaton has 155 states. Word has length 261 [2018-12-03 19:38:12,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:38:12,320 INFO L225 Difference]: With dead ends: 705 [2018-12-03 19:38:12,320 INFO L226 Difference]: Without dead ends: 410 [2018-12-03 19:38:12,325 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 819 GetRequests, 367 SyntacticMatches, 38 SemanticMatches, 414 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37575 ImplicationChecksByTransitivity, 56.2s TimeCoverageRelationStatistics Valid=11795, Invalid=160845, Unknown=0, NotChecked=0, Total=172640 [2018-12-03 19:38:12,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2018-12-03 19:38:12,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 269. [2018-12-03 19:38:12,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2018-12-03 19:38:12,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 271 transitions. [2018-12-03 19:38:12,422 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 271 transitions. Word has length 261 [2018-12-03 19:38:12,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:38:12,422 INFO L480 AbstractCegarLoop]: Abstraction has 269 states and 271 transitions. [2018-12-03 19:38:12,422 INFO L481 AbstractCegarLoop]: Interpolant automaton has 155 states. [2018-12-03 19:38:12,422 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 271 transitions. [2018-12-03 19:38:12,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2018-12-03 19:38:12,423 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:38:12,423 INFO L402 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 37, 37, 37, 1, 1, 1, 1, 1] [2018-12-03 19:38:12,423 INFO L423 AbstractCegarLoop]: === Iteration 67 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:38:12,424 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:38:12,424 INFO L82 PathProgramCache]: Analyzing trace with hash 1569385749, now seen corresponding path program 63 times [2018-12-03 19:38:12,424 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:38:12,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:38:12,424 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:38:12,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:38:12,425 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:38:12,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:38:15,991 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 37 proven. 4885 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:38:15,991 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:38:15,991 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:38:15,992 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:38:15,992 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:38:15,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:38:15,992 INFO L192 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 [2018-12-03 19:38:16,002 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:38:16,002 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:38:16,048 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:38:16,048 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:38:16,054 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:38:19,586 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 37 proven. 4885 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:38:19,586 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:38:19,900 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 37 proven. 4885 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:38:19,920 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:38:19,920 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 78, 78] total 118 [2018-12-03 19:38:19,920 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:38:19,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2018-12-03 19:38:19,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2018-12-03 19:38:19,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=13728, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 19:38:19,921 INFO L87 Difference]: Start difference. First operand 269 states and 271 transitions. Second operand 119 states. [2018-12-03 19:38:36,593 WARN L180 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 193 [2018-12-03 19:38:37,229 WARN L180 SmtUtils]: Spent 262.00 ms on a formula simplification that was a NOOP. DAG size: 193 [2018-12-03 19:38:37,865 WARN L180 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 188 [2018-12-03 19:38:38,317 WARN L180 SmtUtils]: Spent 240.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2018-12-03 19:38:38,764 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 179 [2018-12-03 19:38:39,194 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2018-12-03 19:38:39,632 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-03 19:38:40,045 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-03 19:38:40,449 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 19:38:40,916 WARN L180 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 19:38:41,310 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 19:38:41,683 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 19:38:42,061 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 19:38:42,427 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 19:38:42,780 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 19:38:43,124 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 19:38:43,455 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 19:38:43,776 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 19:38:44,079 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 19:38:44,380 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 19:38:44,663 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 19:38:47,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:38:47,925 INFO L93 Difference]: Finished difference Result 574 states and 579 transitions. [2018-12-03 19:38:47,925 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2018-12-03 19:38:47,925 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 268 [2018-12-03 19:38:47,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:38:47,927 INFO L225 Difference]: With dead ends: 574 [2018-12-03 19:38:47,927 INFO L226 Difference]: Without dead ends: 424 [2018-12-03 19:38:47,928 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 689 GetRequests, 493 SyntacticMatches, 3 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6014 ImplicationChecksByTransitivity, 20.0s TimeCoverageRelationStatistics Valid=2101, Invalid=35729, Unknown=0, NotChecked=0, Total=37830 [2018-12-03 19:38:47,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2018-12-03 19:38:48,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 273. [2018-12-03 19:38:48,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 273 states. [2018-12-03 19:38:48,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 275 transitions. [2018-12-03 19:38:48,018 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 275 transitions. Word has length 268 [2018-12-03 19:38:48,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:38:48,018 INFO L480 AbstractCegarLoop]: Abstraction has 273 states and 275 transitions. [2018-12-03 19:38:48,018 INFO L481 AbstractCegarLoop]: Interpolant automaton has 119 states. [2018-12-03 19:38:48,019 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 275 transitions. [2018-12-03 19:38:48,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2018-12-03 19:38:48,019 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:38:48,019 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1] [2018-12-03 19:38:48,020 INFO L423 AbstractCegarLoop]: === Iteration 68 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:38:48,020 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:38:48,020 INFO L82 PathProgramCache]: Analyzing trace with hash 107131324, now seen corresponding path program 64 times [2018-12-03 19:38:48,020 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:38:48,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:38:48,021 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:38:48,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:38:48,021 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:38:48,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:38:49,983 INFO L134 CoverageAnalysis]: Checked inductivity of 5073 backedges. 2926 proven. 2147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:38:49,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:38:49,983 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:38:49,983 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:38:49,983 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:38:49,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:38:49,984 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:38:49,992 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:38:49,993 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:38:50,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:38:50,047 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:38:52,703 INFO L134 CoverageAnalysis]: Checked inductivity of 5073 backedges. 2926 proven. 2147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:38:52,704 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:38:54,540 INFO L134 CoverageAnalysis]: Checked inductivity of 5073 backedges. 2926 proven. 2147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:38:54,559 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:38:54,559 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 118 [2018-12-03 19:38:54,560 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:38:54,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2018-12-03 19:38:54,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2018-12-03 19:38:54,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3238, Invalid=10804, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 19:38:54,561 INFO L87 Difference]: Start difference. First operand 273 states and 275 transitions. Second operand 119 states. [2018-12-03 19:38:58,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:38:58,078 INFO L93 Difference]: Finished difference Result 585 states and 589 transitions. [2018-12-03 19:38:58,079 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-12-03 19:38:58,079 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 272 [2018-12-03 19:38:58,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:38:58,081 INFO L225 Difference]: With dead ends: 585 [2018-12-03 19:38:58,081 INFO L226 Difference]: Without dead ends: 278 [2018-12-03 19:38:58,082 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 660 GetRequests, 427 SyntacticMatches, 77 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8816 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=5656, Invalid=19150, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 19:38:58,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2018-12-03 19:38:58,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 276. [2018-12-03 19:38:58,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 276 states. [2018-12-03 19:38:58,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 278 transitions. [2018-12-03 19:38:58,168 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 278 transitions. Word has length 272 [2018-12-03 19:38:58,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:38:58,168 INFO L480 AbstractCegarLoop]: Abstraction has 276 states and 278 transitions. [2018-12-03 19:38:58,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has 119 states. [2018-12-03 19:38:58,168 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 278 transitions. [2018-12-03 19:38:58,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-12-03 19:38:58,169 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:38:58,169 INFO L402 BasicCegarLoop]: trace histogram [39, 39, 39, 39, 38, 38, 38, 1, 1, 1, 1, 1] [2018-12-03 19:38:58,170 INFO L423 AbstractCegarLoop]: === Iteration 69 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:38:58,170 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:38:58,170 INFO L82 PathProgramCache]: Analyzing trace with hash 1761642804, now seen corresponding path program 65 times [2018-12-03 19:38:58,170 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:38:58,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:38:58,171 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:38:58,171 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:38:58,171 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:38:58,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat