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_compound_exp_cong.epf -i ../../../trunk/examples/programs/real-life/threadpooling_product.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 16:11:42,522 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 16:11:42,524 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 16:11:42,535 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 16:11:42,536 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 16:11:42,537 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 16:11:42,538 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 16:11:42,540 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 16:11:42,542 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 16:11:42,542 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 16:11:42,543 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-03 16:11:42,544 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-03 16:11:42,545 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-03 16:11:42,546 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-03 16:11:42,547 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-03 16:11:42,547 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-03 16:11:42,548 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-03 16:11:42,550 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-03 16:11:42,552 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-03 16:11:42,554 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-03 16:11:42,555 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-03 16:11:42,556 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-03 16:11:42,559 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-03 16:11:42,559 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-03 16:11:42,559 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-03 16:11:42,560 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-03 16:11:42,561 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-03 16:11:42,562 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-03 16:11:42,563 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-03 16:11:42,564 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-03 16:11:42,564 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-03 16:11:42,565 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-12-03 16:11:42,567 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_exp_cong.epf [2018-12-03 16:11:42,582 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 16:11:42,582 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 16:11:42,583 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 16:11:42,583 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 16:11:42,583 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 16:11:42,583 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 16:11:42,583 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 16:11:42,584 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 16:11:42,584 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-03 16:11:42,584 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 16:11:42,584 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-03 16:11:42,584 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 16:11:42,585 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 16:11:42,585 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 16:11:42,585 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 16:11:42,586 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 16:11:42,586 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 16:11:42,586 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 16:11:42,586 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 16:11:42,586 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 16:11:42,587 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 16:11:42,587 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 16:11:42,587 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 16:11:42,587 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 16:11:42,587 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 16:11:42,588 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 16:11:42,589 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 16:11:42,589 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 16:11:42,589 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 16:11:42,589 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 16:11:42,590 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 16:11:42,590 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 16:11:42,590 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 16:11:42,590 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 16:11:42,591 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 16:11:42,591 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 16:11:42,591 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 16:11:42,591 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 16:11:42,591 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 16:11:42,591 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 16:11:42,592 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 16:11:42,625 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 16:11:42,641 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 16:11:42,650 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 16:11:42,652 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 16:11:42,653 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 16:11:42,653 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/real-life/threadpooling_product.bpl [2018-12-03 16:11:42,654 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/real-life/threadpooling_product.bpl' [2018-12-03 16:11:42,708 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 16:11:42,709 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 16:11:42,710 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 16:11:42,711 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 16:11:42,711 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 16:11:42,732 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:11:42" (1/1) ... [2018-12-03 16:11:42,742 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:11:42" (1/1) ... [2018-12-03 16:11:42,751 WARN L165 Inliner]: Program contained no entry procedure! [2018-12-03 16:11:42,751 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2018-12-03 16:11:42,752 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2018-12-03 16:11:42,755 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 16:11:42,756 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 16:11:42,756 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 16:11:42,756 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 16:11:42,770 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:11:42" (1/1) ... [2018-12-03 16:11:42,770 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:11:42" (1/1) ... [2018-12-03 16:11:42,771 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:11:42" (1/1) ... [2018-12-03 16:11:42,771 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:11:42" (1/1) ... [2018-12-03 16:11:42,776 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:11:42" (1/1) ... [2018-12-03 16:11:42,781 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:11:42" (1/1) ... [2018-12-03 16:11:42,782 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:11:42" (1/1) ... [2018-12-03 16:11:42,785 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 16:11:42,785 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 16:11:42,785 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 16:11:42,786 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 16:11:42,791 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:11:42" (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 16:11:42,868 INFO L124 BoogieDeclarations]: Specification and implementation of procedure product given in one single declaration [2018-12-03 16:11:42,869 INFO L130 BoogieDeclarations]: Found specification of procedure product [2018-12-03 16:11:42,869 INFO L138 BoogieDeclarations]: Found implementation of procedure product [2018-12-03 16:11:43,295 INFO L272 CfgBuilder]: Using library mode [2018-12-03 16:11:43,296 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-03 16:11:43,296 INFO L202 PluginConnector]: Adding new model threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 04:11:43 BoogieIcfgContainer [2018-12-03 16:11:43,297 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 16:11:43,298 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 16:11:43,298 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 16:11:43,301 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 16:11:43,302 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:11:42" (1/2) ... [2018-12-03 16:11:43,303 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3beff66 and model type threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 04:11:43, skipping insertion in model container [2018-12-03 16:11:43,303 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "threadpooling_product.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 04:11:43" (2/2) ... [2018-12-03 16:11:43,305 INFO L112 eAbstractionObserver]: Analyzing ICFG threadpooling_product.bpl [2018-12-03 16:11:43,318 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 16:11:43,328 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-12-03 16:11:43,347 INFO L257 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2018-12-03 16:11:43,384 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 16:11:43,384 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 16:11:43,385 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 16:11:43,385 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 16:11:43,385 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 16:11:43,385 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 16:11:43,385 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 16:11:43,386 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 16:11:43,402 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-12-03 16:11:43,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-03 16:11:43,408 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:11:43,409 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2018-12-03 16:11:43,412 INFO L423 AbstractCegarLoop]: === Iteration 1 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:11:43,418 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:43,419 INFO L82 PathProgramCache]: Analyzing trace with hash 28755683, now seen corresponding path program 1 times [2018-12-03 16:11:43,421 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:11:43,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:43,474 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:43,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:43,474 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:11:43,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:43,624 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 16:11:43,626 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:11:43,626 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 16:11:43,626 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:11:43,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 16:11:43,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 16:11:43,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-03 16:11:43,645 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 5 states. [2018-12-03 16:11:44,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:11:44,334 INFO L93 Difference]: Finished difference Result 49 states and 85 transitions. [2018-12-03 16:11:44,335 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 16:11:44,337 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 5 [2018-12-03 16:11:44,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:11:44,351 INFO L225 Difference]: With dead ends: 49 [2018-12-03 16:11:44,352 INFO L226 Difference]: Without dead ends: 47 [2018-12-03 16:11:44,355 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-03 16:11:44,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-12-03 16:11:44,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 30. [2018-12-03 16:11:44,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-03 16:11:44,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 49 transitions. [2018-12-03 16:11:44,403 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 49 transitions. Word has length 5 [2018-12-03 16:11:44,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:11:44,403 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 49 transitions. [2018-12-03 16:11:44,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 16:11:44,404 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 49 transitions. [2018-12-03 16:11:44,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-03 16:11:44,405 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:11:44,405 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2018-12-03 16:11:44,405 INFO L423 AbstractCegarLoop]: === Iteration 2 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:11:44,406 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:44,406 INFO L82 PathProgramCache]: Analyzing trace with hash 28971747, now seen corresponding path program 1 times [2018-12-03 16:11:44,406 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:11:44,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:44,407 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:44,408 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:44,408 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:11:44,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:44,668 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 16:11:44,668 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:11:44,668 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 16:11:44,669 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:11:44,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 16:11:44,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 16:11:44,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-03 16:11:44,672 INFO L87 Difference]: Start difference. First operand 30 states and 49 transitions. Second operand 5 states. [2018-12-03 16:11:45,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:11:45,102 INFO L93 Difference]: Finished difference Result 57 states and 99 transitions. [2018-12-03 16:11:45,102 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 16:11:45,103 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 5 [2018-12-03 16:11:45,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:11:45,105 INFO L225 Difference]: With dead ends: 57 [2018-12-03 16:11:45,106 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 16:11:45,107 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-03 16:11:45,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 16:11:45,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 38. [2018-12-03 16:11:45,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-12-03 16:11:45,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 63 transitions. [2018-12-03 16:11:45,117 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 63 transitions. Word has length 5 [2018-12-03 16:11:45,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:11:45,118 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 63 transitions. [2018-12-03 16:11:45,118 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 16:11:45,118 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 63 transitions. [2018-12-03 16:11:45,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-12-03 16:11:45,119 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:11:45,119 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:11:45,120 INFO L423 AbstractCegarLoop]: === Iteration 3 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:11:45,120 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:45,120 INFO L82 PathProgramCache]: Analyzing trace with hash 1864688358, now seen corresponding path program 1 times [2018-12-03 16:11:45,120 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:11:45,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:45,122 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:45,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:45,122 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:11:45,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:45,320 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 16:11:45,320 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:11:45,320 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-03 16:11:45,321 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:11:45,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:11:45,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:11:45,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2018-12-03 16:11:45,322 INFO L87 Difference]: Start difference. First operand 38 states and 63 transitions. Second operand 7 states. [2018-12-03 16:11:46,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:11:46,614 INFO L93 Difference]: Finished difference Result 84 states and 147 transitions. [2018-12-03 16:11:46,616 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 16:11:46,616 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2018-12-03 16:11:46,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:11:46,619 INFO L225 Difference]: With dead ends: 84 [2018-12-03 16:11:46,619 INFO L226 Difference]: Without dead ends: 82 [2018-12-03 16:11:46,620 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-12-03 16:11:46,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-12-03 16:11:46,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 51. [2018-12-03 16:11:46,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-03 16:11:46,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 86 transitions. [2018-12-03 16:11:46,636 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 86 transitions. Word has length 7 [2018-12-03 16:11:46,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:11:46,636 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 86 transitions. [2018-12-03 16:11:46,636 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:11:46,636 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 86 transitions. [2018-12-03 16:11:46,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-12-03 16:11:46,637 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:11:46,638 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2018-12-03 16:11:46,638 INFO L423 AbstractCegarLoop]: === Iteration 4 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:11:46,639 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:46,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1865765160, now seen corresponding path program 1 times [2018-12-03 16:11:46,639 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:11:46,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:46,640 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:46,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:46,641 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:11:46,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:46,796 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:11:46,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:11:46,798 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:11:46,799 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 8 with the following transitions: [2018-12-03 16:11:46,801 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [9], [20], [21] [2018-12-03 16:11:46,841 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:11:46,842 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:11:46,940 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:11:46,941 INFO L272 AbstractInterpreter]: Visited 6 different actions 6 times. Never merged. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:11:46,954 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:46,955 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:11:46,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:11:46,956 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 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 16:11:46,968 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:46,968 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:11:46,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:46,986 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:11:47,099 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:11:47,100 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:11:47,155 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:11:47,175 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-12-03 16:11:47,175 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 8 [2018-12-03 16:11:47,175 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:11:47,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 16:11:47,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 16:11:47,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2018-12-03 16:11:47,176 INFO L87 Difference]: Start difference. First operand 51 states and 86 transitions. Second operand 4 states. [2018-12-03 16:11:47,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:11:47,282 INFO L93 Difference]: Finished difference Result 82 states and 137 transitions. [2018-12-03 16:11:47,283 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 16:11:47,283 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 7 [2018-12-03 16:11:47,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:11:47,284 INFO L225 Difference]: With dead ends: 82 [2018-12-03 16:11:47,284 INFO L226 Difference]: Without dead ends: 48 [2018-12-03 16:11:47,285 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2018-12-03 16:11:47,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-12-03 16:11:47,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-12-03 16:11:47,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-12-03 16:11:47,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 76 transitions. [2018-12-03 16:11:47,300 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 76 transitions. Word has length 7 [2018-12-03 16:11:47,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:11:47,301 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 76 transitions. [2018-12-03 16:11:47,301 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 16:11:47,302 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 76 transitions. [2018-12-03 16:11:47,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-12-03 16:11:47,302 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:11:47,303 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:11:47,303 INFO L423 AbstractCegarLoop]: === Iteration 5 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:11:47,304 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:47,304 INFO L82 PathProgramCache]: Analyzing trace with hash 2072633864, now seen corresponding path program 1 times [2018-12-03 16:11:47,304 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:11:47,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:47,305 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:47,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:47,306 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:11:47,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:47,506 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 16:11:47,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:11:47,506 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:11:47,507 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 8 with the following transitions: [2018-12-03 16:11:47,507 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [16], [20], [21] [2018-12-03 16:11:47,509 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:11:47,510 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:11:47,521 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:11:47,521 INFO L272 AbstractInterpreter]: Visited 7 different actions 7 times. Never merged. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:11:47,527 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:47,527 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:11:47,527 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:11:47,527 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 16:11:47,537 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:47,538 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:11:47,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:47,555 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:11:47,609 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 16:11:47,610 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:11:47,679 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 16:11:47,699 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-12-03 16:11:47,699 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 8 [2018-12-03 16:11:47,699 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:11:47,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 16:11:47,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 16:11:47,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2018-12-03 16:11:47,700 INFO L87 Difference]: Start difference. First operand 48 states and 76 transitions. Second operand 4 states. [2018-12-03 16:11:47,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:11:47,789 INFO L93 Difference]: Finished difference Result 82 states and 129 transitions. [2018-12-03 16:11:47,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 16:11:47,790 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 7 [2018-12-03 16:11:47,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:11:47,791 INFO L225 Difference]: With dead ends: 82 [2018-12-03 16:11:47,791 INFO L226 Difference]: Without dead ends: 48 [2018-12-03 16:11:47,792 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2018-12-03 16:11:47,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-12-03 16:11:47,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-12-03 16:11:47,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-12-03 16:11:47,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 70 transitions. [2018-12-03 16:11:47,802 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 70 transitions. Word has length 7 [2018-12-03 16:11:47,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:11:47,802 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 70 transitions. [2018-12-03 16:11:47,803 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 16:11:47,803 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 70 transitions. [2018-12-03 16:11:47,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-12-03 16:11:47,803 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:11:47,804 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:11:47,804 INFO L423 AbstractCegarLoop]: === Iteration 6 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:11:47,804 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:47,804 INFO L82 PathProgramCache]: Analyzing trace with hash 2071833542, now seen corresponding path program 1 times [2018-12-03 16:11:47,805 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:11:47,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:47,806 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:47,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:47,806 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:11:47,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:47,896 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 16:11:47,896 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:11:47,896 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-03 16:11:47,897 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:11:47,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:11:47,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:11:47,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2018-12-03 16:11:47,899 INFO L87 Difference]: Start difference. First operand 48 states and 70 transitions. Second operand 7 states. [2018-12-03 16:11:48,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:11:48,126 INFO L93 Difference]: Finished difference Result 62 states and 89 transitions. [2018-12-03 16:11:48,126 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 16:11:48,126 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2018-12-03 16:11:48,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:11:48,127 INFO L225 Difference]: With dead ends: 62 [2018-12-03 16:11:48,128 INFO L226 Difference]: Without dead ends: 60 [2018-12-03 16:11:48,128 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-12-03 16:11:48,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-12-03 16:11:48,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2018-12-03 16:11:48,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-12-03 16:11:48,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 85 transitions. [2018-12-03 16:11:48,207 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 85 transitions. Word has length 7 [2018-12-03 16:11:48,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:11:48,207 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 85 transitions. [2018-12-03 16:11:48,207 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:11:48,207 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 85 transitions. [2018-12-03 16:11:48,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 16:11:48,209 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:11:48,209 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:11:48,211 INFO L423 AbstractCegarLoop]: === Iteration 7 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:11:48,211 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:48,212 INFO L82 PathProgramCache]: Analyzing trace with hash 101966393, now seen corresponding path program 1 times [2018-12-03 16:11:48,212 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:11:48,212 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:48,213 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:48,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:48,213 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:11:48,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:48,348 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 16:11:48,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:11:48,348 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:11:48,349 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 11 with the following transitions: [2018-12-03 16:11:48,349 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [25], [29], [32], [65], [66] [2018-12-03 16:11:48,350 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:11:48,350 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:11:48,382 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:11:48,382 INFO L272 AbstractInterpreter]: Visited 10 different actions 15 times. Merged at 5 different actions 5 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:11:48,388 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:48,388 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:11:48,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:11:48,388 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 16:11:48,398 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:48,398 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:11:48,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:48,412 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:11:48,566 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 16:11:48,566 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:11:48,678 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 16:11:48,698 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:11:48,698 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 19 [2018-12-03 16:11:48,698 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:11:48,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 16:11:48,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 16:11:48,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:11:48,700 INFO L87 Difference]: Start difference. First operand 58 states and 85 transitions. Second operand 14 states. [2018-12-03 16:11:49,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:11:49,284 INFO L93 Difference]: Finished difference Result 93 states and 137 transitions. [2018-12-03 16:11:49,284 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 16:11:49,284 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 10 [2018-12-03 16:11:49,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:11:49,286 INFO L225 Difference]: With dead ends: 93 [2018-12-03 16:11:49,286 INFO L226 Difference]: Without dead ends: 92 [2018-12-03 16:11:49,287 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=179, Invalid=751, Unknown=0, NotChecked=0, Total=930 [2018-12-03 16:11:49,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-12-03 16:11:49,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 77. [2018-12-03 16:11:49,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-12-03 16:11:49,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 119 transitions. [2018-12-03 16:11:49,299 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 119 transitions. Word has length 10 [2018-12-03 16:11:49,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:11:49,300 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 119 transitions. [2018-12-03 16:11:49,300 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 16:11:49,300 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 119 transitions. [2018-12-03 16:11:49,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 16:11:49,301 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:11:49,301 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:11:49,302 INFO L423 AbstractCegarLoop]: === Iteration 8 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:11:49,302 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:49,302 INFO L82 PathProgramCache]: Analyzing trace with hash 103259259, now seen corresponding path program 1 times [2018-12-03 16:11:49,302 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:11:49,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:49,303 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:49,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:49,303 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:11:49,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:49,498 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 16:11:49,499 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:11:49,499 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-12-03 16:11:49,499 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:11:49,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 16:11:49,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 16:11:49,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2018-12-03 16:11:49,501 INFO L87 Difference]: Start difference. First operand 77 states and 119 transitions. Second operand 8 states. [2018-12-03 16:11:50,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:11:50,034 INFO L93 Difference]: Finished difference Result 98 states and 142 transitions. [2018-12-03 16:11:50,034 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 16:11:50,034 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 10 [2018-12-03 16:11:50,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:11:50,035 INFO L225 Difference]: With dead ends: 98 [2018-12-03 16:11:50,035 INFO L226 Difference]: Without dead ends: 96 [2018-12-03 16:11:50,035 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=84, Invalid=222, Unknown=0, NotChecked=0, Total=306 [2018-12-03 16:11:50,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-12-03 16:11:50,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 80. [2018-12-03 16:11:50,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-12-03 16:11:50,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 125 transitions. [2018-12-03 16:11:50,047 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 125 transitions. Word has length 10 [2018-12-03 16:11:50,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:11:50,048 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 125 transitions. [2018-12-03 16:11:50,048 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 16:11:50,048 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 125 transitions. [2018-12-03 16:11:50,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 16:11:50,049 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:11:50,049 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:11:50,049 INFO L423 AbstractCegarLoop]: === Iteration 9 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:11:50,050 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:50,050 INFO L82 PathProgramCache]: Analyzing trace with hash -176034144, now seen corresponding path program 1 times [2018-12-03 16:11:50,050 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:11:50,051 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:50,051 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:50,051 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:50,051 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:11:50,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:50,174 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:11:50,174 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:11:50,174 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:11:50,175 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 11 with the following transitions: [2018-12-03 16:11:50,175 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [65], [66], [67], [70] [2018-12-03 16:11:50,177 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:11:50,178 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:11:50,190 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:11:50,191 INFO L272 AbstractInterpreter]: Visited 9 different actions 10 times. Merged at 1 different actions 1 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:11:50,225 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:50,225 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:11:50,225 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:11:50,226 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 16:11:50,243 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:50,244 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:11:50,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:50,254 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:11:50,479 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:11:50,479 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:11:50,768 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:11:50,789 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:11:50,789 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 18 [2018-12-03 16:11:50,789 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:11:50,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 16:11:50,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 16:11:50,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:11:50,791 INFO L87 Difference]: Start difference. First operand 80 states and 125 transitions. Second operand 14 states. [2018-12-03 16:11:51,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:11:51,419 INFO L93 Difference]: Finished difference Result 120 states and 190 transitions. [2018-12-03 16:11:51,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 16:11:51,420 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 10 [2018-12-03 16:11:51,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:11:51,422 INFO L225 Difference]: With dead ends: 120 [2018-12-03 16:11:51,422 INFO L226 Difference]: Without dead ends: 118 [2018-12-03 16:11:51,423 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=128, Invalid=522, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:11:51,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-12-03 16:11:51,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 81. [2018-12-03 16:11:51,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-12-03 16:11:51,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 127 transitions. [2018-12-03 16:11:51,441 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 127 transitions. Word has length 10 [2018-12-03 16:11:51,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:11:51,442 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 127 transitions. [2018-12-03 16:11:51,442 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 16:11:51,442 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 127 transitions. [2018-12-03 16:11:51,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 16:11:51,443 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:11:51,443 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:11:51,443 INFO L423 AbstractCegarLoop]: === Iteration 10 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:11:51,444 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:51,444 INFO L82 PathProgramCache]: Analyzing trace with hash -176034432, now seen corresponding path program 1 times [2018-12-03 16:11:51,444 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:11:51,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:51,445 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:51,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:51,445 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:11:51,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:51,513 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 16:11:51,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:11:51,514 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:11:51,514 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 11 with the following transitions: [2018-12-03 16:11:51,514 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [56], [57], [65], [67], [70] [2018-12-03 16:11:51,515 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:11:51,516 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:11:51,530 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:11:51,531 INFO L272 AbstractInterpreter]: Visited 10 different actions 13 times. Merged at 3 different actions 3 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:11:51,540 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:51,540 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:11:51,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:11:51,540 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 16:11:51,550 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:51,551 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:11:51,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:51,562 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:11:51,704 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 16:11:51,705 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:11:51,864 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 16:11:51,887 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:11:51,887 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 17 [2018-12-03 16:11:51,888 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:11:51,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 16:11:51,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 16:11:51,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2018-12-03 16:11:51,889 INFO L87 Difference]: Start difference. First operand 81 states and 127 transitions. Second operand 13 states. [2018-12-03 16:11:54,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:11:54,479 INFO L93 Difference]: Finished difference Result 164 states and 242 transitions. [2018-12-03 16:11:54,480 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 16:11:54,480 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 10 [2018-12-03 16:11:54,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:11:54,482 INFO L225 Difference]: With dead ends: 164 [2018-12-03 16:11:54,482 INFO L226 Difference]: Without dead ends: 162 [2018-12-03 16:11:54,483 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 575 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=459, Invalid=1991, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 16:11:54,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2018-12-03 16:11:54,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 108. [2018-12-03 16:11:54,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-12-03 16:11:54,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 174 transitions. [2018-12-03 16:11:54,504 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 174 transitions. Word has length 10 [2018-12-03 16:11:54,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:11:54,504 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 174 transitions. [2018-12-03 16:11:54,504 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 16:11:54,504 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 174 transitions. [2018-12-03 16:11:54,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 16:11:54,505 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:11:54,505 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:11:54,506 INFO L423 AbstractCegarLoop]: === Iteration 11 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:11:54,506 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:54,506 INFO L82 PathProgramCache]: Analyzing trace with hash -184622601, now seen corresponding path program 1 times [2018-12-03 16:11:54,506 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:11:54,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:54,507 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:54,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:54,507 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:11:54,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:54,634 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 16:11:54,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:11:54,634 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:11:54,634 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 11 with the following transitions: [2018-12-03 16:11:54,635 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [56], [58], [61], [65], [66] [2018-12-03 16:11:54,636 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:11:54,636 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:11:54,649 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:11:54,650 INFO L272 AbstractInterpreter]: Visited 10 different actions 13 times. Merged at 3 different actions 3 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:11:54,664 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:54,664 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:11:54,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:11:54,664 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 16:11:54,672 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:54,673 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:11:54,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:54,679 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:11:54,756 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 16:11:54,756 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:11:54,839 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 16:11:54,864 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:11:54,864 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 19 [2018-12-03 16:11:54,864 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:11:54,865 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 16:11:54,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 16:11:54,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:11:54,865 INFO L87 Difference]: Start difference. First operand 108 states and 174 transitions. Second operand 14 states. [2018-12-03 16:11:56,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:11:56,059 INFO L93 Difference]: Finished difference Result 164 states and 252 transitions. [2018-12-03 16:11:56,059 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 16:11:56,059 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 10 [2018-12-03 16:11:56,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:11:56,060 INFO L225 Difference]: With dead ends: 164 [2018-12-03 16:11:56,060 INFO L226 Difference]: Without dead ends: 163 [2018-12-03 16:11:56,061 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=209, Invalid=721, Unknown=0, NotChecked=0, Total=930 [2018-12-03 16:11:56,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-12-03 16:11:56,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 122. [2018-12-03 16:11:56,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-12-03 16:11:56,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 197 transitions. [2018-12-03 16:11:56,079 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 197 transitions. Word has length 10 [2018-12-03 16:11:56,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:11:56,080 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 197 transitions. [2018-12-03 16:11:56,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 16:11:56,080 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 197 transitions. [2018-12-03 16:11:56,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 16:11:56,081 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:11:56,081 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:11:56,081 INFO L423 AbstractCegarLoop]: === Iteration 12 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:11:56,082 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:56,082 INFO L82 PathProgramCache]: Analyzing trace with hash -184621319, now seen corresponding path program 1 times [2018-12-03 16:11:56,082 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:11:56,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:56,083 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:56,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:56,083 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:11:56,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:56,186 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 16:11:56,186 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:11:56,186 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-12-03 16:11:56,186 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:11:56,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 16:11:56,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 16:11:56,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2018-12-03 16:11:56,187 INFO L87 Difference]: Start difference. First operand 122 states and 197 transitions. Second operand 8 states. [2018-12-03 16:11:56,676 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-12-03 16:11:56,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:11:56,898 INFO L93 Difference]: Finished difference Result 143 states and 218 transitions. [2018-12-03 16:11:56,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 16:11:56,901 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 10 [2018-12-03 16:11:56,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:11:56,902 INFO L225 Difference]: With dead ends: 143 [2018-12-03 16:11:56,902 INFO L226 Difference]: Without dead ends: 141 [2018-12-03 16:11:56,903 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=177, Unknown=0, NotChecked=0, Total=240 [2018-12-03 16:11:56,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2018-12-03 16:11:56,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 126. [2018-12-03 16:11:56,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-12-03 16:11:56,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 204 transitions. [2018-12-03 16:11:56,920 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 204 transitions. Word has length 10 [2018-12-03 16:11:56,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:11:56,921 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 204 transitions. [2018-12-03 16:11:56,921 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 16:11:56,921 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 204 transitions. [2018-12-03 16:11:56,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 16:11:56,922 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:11:56,922 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:11:56,922 INFO L423 AbstractCegarLoop]: === Iteration 13 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:11:56,922 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:56,923 INFO L82 PathProgramCache]: Analyzing trace with hash -973282432, now seen corresponding path program 1 times [2018-12-03 16:11:56,923 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:11:56,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:56,924 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:56,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:56,924 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:11:56,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:57,037 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 16:11:57,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:11:57,038 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:11:57,038 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 11 with the following transitions: [2018-12-03 16:11:57,038 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [57], [65], [67], [70] [2018-12-03 16:11:57,040 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:11:57,040 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:11:57,055 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:11:57,055 INFO L272 AbstractInterpreter]: Visited 10 different actions 13 times. Merged at 3 different actions 3 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:11:57,062 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:57,062 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:11:57,062 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:11:57,062 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 16:11:57,072 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:57,072 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:11:57,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:57,078 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:11:57,184 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 16:11:57,184 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:11:57,267 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 16:11:57,287 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:11:57,288 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 19 [2018-12-03 16:11:57,288 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:11:57,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 16:11:57,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 16:11:57,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:11:57,289 INFO L87 Difference]: Start difference. First operand 126 states and 204 transitions. Second operand 14 states. [2018-12-03 16:11:58,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:11:58,116 INFO L93 Difference]: Finished difference Result 177 states and 275 transitions. [2018-12-03 16:11:58,119 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 16:11:58,119 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 10 [2018-12-03 16:11:58,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:11:58,121 INFO L225 Difference]: With dead ends: 177 [2018-12-03 16:11:58,121 INFO L226 Difference]: Without dead ends: 176 [2018-12-03 16:11:58,122 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=209, Invalid=721, Unknown=0, NotChecked=0, Total=930 [2018-12-03 16:11:58,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2018-12-03 16:11:58,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 140. [2018-12-03 16:11:58,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2018-12-03 16:11:58,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 230 transitions. [2018-12-03 16:11:58,143 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 230 transitions. Word has length 10 [2018-12-03 16:11:58,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:11:58,143 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 230 transitions. [2018-12-03 16:11:58,143 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 16:11:58,143 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 230 transitions. [2018-12-03 16:11:58,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 16:11:58,144 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:11:58,144 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:11:58,144 INFO L423 AbstractCegarLoop]: === Iteration 14 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:11:58,144 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:58,144 INFO L82 PathProgramCache]: Analyzing trace with hash -973281662, now seen corresponding path program 1 times [2018-12-03 16:11:58,144 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:11:58,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:58,145 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:58,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:58,145 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:11:58,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:58,249 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 16:11:58,250 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:11:58,250 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-12-03 16:11:58,250 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:11:58,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 16:11:58,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 16:11:58,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2018-12-03 16:11:58,251 INFO L87 Difference]: Start difference. First operand 140 states and 230 transitions. Second operand 8 states. [2018-12-03 16:11:58,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:11:58,709 INFO L93 Difference]: Finished difference Result 155 states and 242 transitions. [2018-12-03 16:11:58,710 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 16:11:58,710 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 10 [2018-12-03 16:11:58,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:11:58,712 INFO L225 Difference]: With dead ends: 155 [2018-12-03 16:11:58,712 INFO L226 Difference]: Without dead ends: 153 [2018-12-03 16:11:58,712 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=177, Unknown=0, NotChecked=0, Total=240 [2018-12-03 16:11:58,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2018-12-03 16:11:58,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 140. [2018-12-03 16:11:58,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2018-12-03 16:11:58,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 230 transitions. [2018-12-03 16:11:58,737 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 230 transitions. Word has length 10 [2018-12-03 16:11:58,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:11:58,738 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 230 transitions. [2018-12-03 16:11:58,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 16:11:58,738 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 230 transitions. [2018-12-03 16:11:58,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 16:11:58,738 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:11:58,739 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:11:58,739 INFO L423 AbstractCegarLoop]: === Iteration 15 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:11:58,739 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:58,739 INFO L82 PathProgramCache]: Analyzing trace with hash -981870601, now seen corresponding path program 1 times [2018-12-03 16:11:58,739 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:11:58,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:58,740 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:58,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:11:58,741 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:11:58,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:58,850 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 16:11:58,851 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:11:58,851 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:11:58,851 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 11 with the following transitions: [2018-12-03 16:11:58,852 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [58], [61], [65], [66] [2018-12-03 16:11:58,853 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:11:58,853 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:11:58,869 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:11:58,877 INFO L272 AbstractInterpreter]: Visited 10 different actions 13 times. Merged at 3 different actions 3 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:11:58,884 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:11:58,885 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:11:58,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:11:58,885 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 16:11:58,895 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:11:58,895 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:11:58,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:11:58,916 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:11:59,010 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 16:11:59,011 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:11:59,110 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 16:11:59,131 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:11:59,131 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 17 [2018-12-03 16:11:59,131 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:11:59,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 16:11:59,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 16:11:59,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2018-12-03 16:11:59,132 INFO L87 Difference]: Start difference. First operand 140 states and 230 transitions. Second operand 13 states. [2018-12-03 16:12:00,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:00,704 INFO L93 Difference]: Finished difference Result 239 states and 370 transitions. [2018-12-03 16:12:00,704 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 16:12:00,704 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 10 [2018-12-03 16:12:00,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:00,707 INFO L225 Difference]: With dead ends: 239 [2018-12-03 16:12:00,707 INFO L226 Difference]: Without dead ends: 237 [2018-12-03 16:12:00,709 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 584 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=1991, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 16:12:00,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2018-12-03 16:12:00,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 179. [2018-12-03 16:12:00,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2018-12-03 16:12:00,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 295 transitions. [2018-12-03 16:12:00,738 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 295 transitions. Word has length 10 [2018-12-03 16:12:00,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:00,738 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 295 transitions. [2018-12-03 16:12:00,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 16:12:00,738 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 295 transitions. [2018-12-03 16:12:00,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 16:12:00,739 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:00,739 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:00,739 INFO L423 AbstractCegarLoop]: === Iteration 16 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:00,740 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:00,740 INFO L82 PathProgramCache]: Analyzing trace with hash -981870889, now seen corresponding path program 1 times [2018-12-03 16:12:00,740 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:00,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:00,741 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:00,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:00,741 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:00,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:00,820 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:00,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:00,821 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:00,821 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 11 with the following transitions: [2018-12-03 16:12:00,822 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [57], [58], [61] [2018-12-03 16:12:00,823 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:00,823 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:00,835 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:00,835 INFO L272 AbstractInterpreter]: Visited 9 different actions 10 times. Merged at 1 different actions 1 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:12:00,845 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:00,845 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:00,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:00,845 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 16:12:00,854 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:00,854 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:00,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:00,875 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:01,007 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:01,007 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:01,127 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:01,147 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:01,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 18 [2018-12-03 16:12:01,148 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:01,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 16:12:01,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 16:12:01,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:12:01,149 INFO L87 Difference]: Start difference. First operand 179 states and 295 transitions. Second operand 14 states. [2018-12-03 16:12:02,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:02,169 INFO L93 Difference]: Finished difference Result 221 states and 364 transitions. [2018-12-03 16:12:02,169 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 16:12:02,169 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 10 [2018-12-03 16:12:02,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:02,172 INFO L225 Difference]: With dead ends: 221 [2018-12-03 16:12:02,172 INFO L226 Difference]: Without dead ends: 219 [2018-12-03 16:12:02,174 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=128, Invalid=522, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:12:02,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-12-03 16:12:02,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 187. [2018-12-03 16:12:02,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-12-03 16:12:02,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 309 transitions. [2018-12-03 16:12:02,204 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 309 transitions. Word has length 10 [2018-12-03 16:12:02,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:02,204 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 309 transitions. [2018-12-03 16:12:02,205 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 16:12:02,205 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 309 transitions. [2018-12-03 16:12:02,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 16:12:02,205 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:02,205 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:02,206 INFO L423 AbstractCegarLoop]: === Iteration 17 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:02,206 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:02,206 INFO L82 PathProgramCache]: Analyzing trace with hash 1101306322, now seen corresponding path program 1 times [2018-12-03 16:12:02,206 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:02,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:02,207 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:02,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:02,208 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:02,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:02,328 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 16:12:02,328 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:02,328 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:02,328 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 11 with the following transitions: [2018-12-03 16:12:02,329 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [45], [47], [50], [56], [57] [2018-12-03 16:12:02,330 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:02,330 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:02,344 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:02,344 INFO L272 AbstractInterpreter]: Visited 10 different actions 15 times. Merged at 5 different actions 5 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:12:02,375 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:02,375 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:02,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:02,375 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 16:12:02,384 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:02,384 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:02,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:02,390 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:02,479 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 16:12:02,479 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:02,578 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 16:12:02,598 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:02,598 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 19 [2018-12-03 16:12:02,599 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:02,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 16:12:02,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 16:12:02,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:12:02,600 INFO L87 Difference]: Start difference. First operand 187 states and 309 transitions. Second operand 14 states. [2018-12-03 16:12:03,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:03,064 INFO L93 Difference]: Finished difference Result 198 states and 316 transitions. [2018-12-03 16:12:03,064 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 16:12:03,065 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 10 [2018-12-03 16:12:03,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:03,066 INFO L225 Difference]: With dead ends: 198 [2018-12-03 16:12:03,066 INFO L226 Difference]: Without dead ends: 197 [2018-12-03 16:12:03,067 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=179, Invalid=751, Unknown=0, NotChecked=0, Total=930 [2018-12-03 16:12:03,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-12-03 16:12:03,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 187. [2018-12-03 16:12:03,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-12-03 16:12:03,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 308 transitions. [2018-12-03 16:12:03,098 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 308 transitions. Word has length 10 [2018-12-03 16:12:03,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:03,098 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 308 transitions. [2018-12-03 16:12:03,098 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 16:12:03,098 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 308 transitions. [2018-12-03 16:12:03,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 16:12:03,099 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:03,099 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:03,099 INFO L423 AbstractCegarLoop]: === Iteration 18 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:03,100 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:03,100 INFO L82 PathProgramCache]: Analyzing trace with hash 1102106644, now seen corresponding path program 1 times [2018-12-03 16:12:03,100 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:03,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:03,101 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:03,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:03,101 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:03,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:03,187 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 16:12:03,187 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:12:03,187 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-12-03 16:12:03,188 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:12:03,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 16:12:03,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 16:12:03,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2018-12-03 16:12:03,188 INFO L87 Difference]: Start difference. First operand 187 states and 308 transitions. Second operand 8 states. [2018-12-03 16:12:03,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:03,468 INFO L93 Difference]: Finished difference Result 203 states and 321 transitions. [2018-12-03 16:12:03,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 16:12:03,468 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 10 [2018-12-03 16:12:03,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:03,469 INFO L225 Difference]: With dead ends: 203 [2018-12-03 16:12:03,470 INFO L226 Difference]: Without dead ends: 201 [2018-12-03 16:12:03,470 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=84, Invalid=222, Unknown=0, NotChecked=0, Total=306 [2018-12-03 16:12:03,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2018-12-03 16:12:03,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 188. [2018-12-03 16:12:03,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2018-12-03 16:12:03,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 309 transitions. [2018-12-03 16:12:03,500 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 309 transitions. Word has length 10 [2018-12-03 16:12:03,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:03,500 INFO L480 AbstractCegarLoop]: Abstraction has 188 states and 309 transitions. [2018-12-03 16:12:03,500 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 16:12:03,500 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 309 transitions. [2018-12-03 16:12:03,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 16:12:03,501 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:03,501 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:03,501 INFO L423 AbstractCegarLoop]: === Iteration 19 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:03,502 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:03,502 INFO L82 PathProgramCache]: Analyzing trace with hash 240543358, now seen corresponding path program 1 times [2018-12-03 16:12:03,502 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:03,502 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:03,503 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:03,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:03,503 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:03,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:03,795 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:03,795 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:03,796 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:03,796 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 13 with the following transitions: [2018-12-03 16:12:03,796 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [27], [29], [32], [65], [66] [2018-12-03 16:12:03,797 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:03,797 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:03,832 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:03,832 INFO L272 AbstractInterpreter]: Visited 10 different actions 17 times. Merged at 7 different actions 7 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:12:03,849 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:03,849 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:03,849 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:03,849 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 16:12:03,857 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:03,858 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:03,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:03,864 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:03,961 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:03,961 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:04,014 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:04,033 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:04,033 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 19 [2018-12-03 16:12:04,033 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:04,034 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 16:12:04,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 16:12:04,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:12:04,035 INFO L87 Difference]: Start difference. First operand 188 states and 309 transitions. Second operand 16 states. [2018-12-03 16:12:05,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:05,712 INFO L93 Difference]: Finished difference Result 410 states and 662 transitions. [2018-12-03 16:12:05,713 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 16:12:05,713 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 12 [2018-12-03 16:12:05,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:05,715 INFO L225 Difference]: With dead ends: 410 [2018-12-03 16:12:05,715 INFO L226 Difference]: Without dead ends: 408 [2018-12-03 16:12:05,717 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 777 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=707, Invalid=2155, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 16:12:05,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2018-12-03 16:12:05,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 291. [2018-12-03 16:12:05,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 291 states. [2018-12-03 16:12:05,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 488 transitions. [2018-12-03 16:12:05,771 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 488 transitions. Word has length 12 [2018-12-03 16:12:05,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:05,771 INFO L480 AbstractCegarLoop]: Abstraction has 291 states and 488 transitions. [2018-12-03 16:12:05,771 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 16:12:05,771 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 488 transitions. [2018-12-03 16:12:05,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 16:12:05,772 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:05,772 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:05,772 INFO L423 AbstractCegarLoop]: === Iteration 20 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:05,772 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:05,772 INFO L82 PathProgramCache]: Analyzing trace with hash 447688542, now seen corresponding path program 1 times [2018-12-03 16:12:05,772 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:05,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:05,773 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:05,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:05,773 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:05,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:05,876 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 16:12:05,876 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:12:05,876 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2018-12-03 16:12:05,876 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:12:05,877 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-03 16:12:05,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-03 16:12:05,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2018-12-03 16:12:05,877 INFO L87 Difference]: Start difference. First operand 291 states and 488 transitions. Second operand 10 states. [2018-12-03 16:12:06,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:06,328 INFO L93 Difference]: Finished difference Result 321 states and 535 transitions. [2018-12-03 16:12:06,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 16:12:06,338 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 12 [2018-12-03 16:12:06,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:06,340 INFO L225 Difference]: With dead ends: 321 [2018-12-03 16:12:06,340 INFO L226 Difference]: Without dead ends: 319 [2018-12-03 16:12:06,341 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=94, Invalid=286, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:12:06,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-12-03 16:12:06,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 316. [2018-12-03 16:12:06,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2018-12-03 16:12:06,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 529 transitions. [2018-12-03 16:12:06,406 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 529 transitions. Word has length 12 [2018-12-03 16:12:06,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:06,406 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 529 transitions. [2018-12-03 16:12:06,407 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-03 16:12:06,407 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 529 transitions. [2018-12-03 16:12:06,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 16:12:06,407 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:06,408 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:06,408 INFO L423 AbstractCegarLoop]: === Iteration 21 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:06,408 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:06,408 INFO L82 PathProgramCache]: Analyzing trace with hash 1316178012, now seen corresponding path program 1 times [2018-12-03 16:12:06,408 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:06,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:06,409 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:06,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:06,409 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:06,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:06,499 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:06,500 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:06,500 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:06,500 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 13 with the following transitions: [2018-12-03 16:12:06,500 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [57], [58], [63] [2018-12-03 16:12:06,501 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:06,501 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:06,512 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:06,513 INFO L272 AbstractInterpreter]: Visited 9 different actions 12 times. Merged at 3 different actions 3 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:12:06,520 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:06,520 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:06,520 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:06,520 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 16:12:06,529 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:06,529 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:06,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:06,554 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:06,645 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:06,645 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:06,703 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:06,722 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:06,723 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 16 [2018-12-03 16:12:06,723 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:06,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 16:12:06,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 16:12:06,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2018-12-03 16:12:06,723 INFO L87 Difference]: Start difference. First operand 316 states and 529 transitions. Second operand 14 states. [2018-12-03 16:12:07,679 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2018-12-03 16:12:08,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:08,606 INFO L93 Difference]: Finished difference Result 361 states and 604 transitions. [2018-12-03 16:12:08,607 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 16:12:08,607 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 12 [2018-12-03 16:12:08,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:08,608 INFO L225 Difference]: With dead ends: 361 [2018-12-03 16:12:08,609 INFO L226 Difference]: Without dead ends: 360 [2018-12-03 16:12:08,609 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=194, Invalid=508, Unknown=0, NotChecked=0, Total=702 [2018-12-03 16:12:08,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2018-12-03 16:12:08,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 309. [2018-12-03 16:12:08,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 309 states. [2018-12-03 16:12:08,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 518 transitions. [2018-12-03 16:12:08,684 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 518 transitions. Word has length 12 [2018-12-03 16:12:08,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:08,684 INFO L480 AbstractCegarLoop]: Abstraction has 309 states and 518 transitions. [2018-12-03 16:12:08,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 16:12:08,684 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 518 transitions. [2018-12-03 16:12:08,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 16:12:08,685 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:08,685 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:08,685 INFO L423 AbstractCegarLoop]: === Iteration 22 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:08,686 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:08,686 INFO L82 PathProgramCache]: Analyzing trace with hash -1525011273, now seen corresponding path program 1 times [2018-12-03 16:12:08,686 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:08,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:08,687 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:08,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:08,687 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:08,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:08,827 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:08,828 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:08,828 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:08,828 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 13 with the following transitions: [2018-12-03 16:12:08,828 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [45], [47], [52], [56], [57] [2018-12-03 16:12:08,829 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:08,829 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:08,860 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:08,860 INFO L272 AbstractInterpreter]: Visited 10 different actions 17 times. Merged at 7 different actions 7 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:12:08,893 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:08,893 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:08,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:08,894 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 16:12:08,903 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:08,903 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:08,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:08,910 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:09,003 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:09,004 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:09,059 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:09,078 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:09,078 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 19 [2018-12-03 16:12:09,078 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:09,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 16:12:09,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 16:12:09,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:12:09,079 INFO L87 Difference]: Start difference. First operand 309 states and 518 transitions. Second operand 16 states. [2018-12-03 16:12:11,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:11,041 INFO L93 Difference]: Finished difference Result 612 states and 1016 transitions. [2018-12-03 16:12:11,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 16:12:11,043 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 12 [2018-12-03 16:12:11,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:11,046 INFO L225 Difference]: With dead ends: 612 [2018-12-03 16:12:11,047 INFO L226 Difference]: Without dead ends: 610 [2018-12-03 16:12:11,048 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 782 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=707, Invalid=2155, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 16:12:11,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2018-12-03 16:12:11,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 403. [2018-12-03 16:12:11,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 403 states. [2018-12-03 16:12:11,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 685 transitions. [2018-12-03 16:12:11,128 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 685 transitions. Word has length 12 [2018-12-03 16:12:11,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:11,128 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 685 transitions. [2018-12-03 16:12:11,128 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 16:12:11,128 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 685 transitions. [2018-12-03 16:12:11,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 16:12:11,129 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:11,129 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:11,129 INFO L423 AbstractCegarLoop]: === Iteration 23 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:11,130 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:11,130 INFO L82 PathProgramCache]: Analyzing trace with hash 1000080215, now seen corresponding path program 1 times [2018-12-03 16:12:11,130 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:11,130 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:11,131 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:11,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:11,131 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:11,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:11,307 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:11,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:11,307 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:11,308 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 16:12:11,308 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [27], [45], [46], [47], [50] [2018-12-03 16:12:11,309 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:11,309 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:11,335 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:11,335 INFO L272 AbstractInterpreter]: Visited 12 different actions 23 times. Merged at 9 different actions 10 times. Never widened. Found 3 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 16:12:11,346 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:11,347 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:11,347 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:11,347 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 16:12:11,356 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:11,356 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:11,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:11,362 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:11,456 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:11,456 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:11,500 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:11,520 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-12-03 16:12:11,520 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [8] total 16 [2018-12-03 16:12:11,520 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:12:11,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:12:11,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:12:11,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2018-12-03 16:12:11,521 INFO L87 Difference]: Start difference. First operand 403 states and 685 transitions. Second operand 7 states. [2018-12-03 16:12:12,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:12,326 INFO L93 Difference]: Finished difference Result 1357 states and 2283 transitions. [2018-12-03 16:12:12,326 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 16:12:12,326 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-12-03 16:12:12,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:12,330 INFO L225 Difference]: With dead ends: 1357 [2018-12-03 16:12:12,331 INFO L226 Difference]: Without dead ends: 956 [2018-12-03 16:12:12,333 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=137, Invalid=513, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:12:12,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 956 states. [2018-12-03 16:12:12,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 956 to 693. [2018-12-03 16:12:12,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 693 states. [2018-12-03 16:12:12,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 693 states to 693 states and 1170 transitions. [2018-12-03 16:12:12,470 INFO L78 Accepts]: Start accepts. Automaton has 693 states and 1170 transitions. Word has length 13 [2018-12-03 16:12:12,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:12,471 INFO L480 AbstractCegarLoop]: Abstraction has 693 states and 1170 transitions. [2018-12-03 16:12:12,471 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:12:12,471 INFO L276 IsEmpty]: Start isEmpty. Operand 693 states and 1170 transitions. [2018-12-03 16:12:12,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 16:12:12,472 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:12,472 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:12,472 INFO L423 AbstractCegarLoop]: === Iteration 24 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:12,472 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:12,473 INFO L82 PathProgramCache]: Analyzing trace with hash -86603521, now seen corresponding path program 1 times [2018-12-03 16:12:12,473 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:12,473 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:12,473 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:12,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:12,474 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:12,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:12,559 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 16:12:12,559 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:12,559 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:12,559 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 16:12:12,559 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [45], [46], [56], [58], [63], [65], [67], [70] [2018-12-03 16:12:12,561 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:12,561 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:12,573 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:12,573 INFO L272 AbstractInterpreter]: Visited 13 different actions 18 times. Merged at 4 different actions 4 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 16:12:12,579 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:12,579 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:12,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:12,580 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 16:12:12,590 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:12,590 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:12,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:12,597 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:12,706 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 16:12:12,707 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:12,810 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 16:12:12,830 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-12-03 16:12:12,831 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [7, 7] total 16 [2018-12-03 16:12:12,831 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:12:12,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:12:12,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:12:12,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2018-12-03 16:12:12,832 INFO L87 Difference]: Start difference. First operand 693 states and 1170 transitions. Second operand 7 states. [2018-12-03 16:12:13,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:13,133 INFO L93 Difference]: Finished difference Result 1544 states and 2592 transitions. [2018-12-03 16:12:13,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 16:12:13,140 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-12-03 16:12:13,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:13,144 INFO L225 Difference]: With dead ends: 1544 [2018-12-03 16:12:13,144 INFO L226 Difference]: Without dead ends: 853 [2018-12-03 16:12:13,146 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:12:13,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 853 states. [2018-12-03 16:12:13,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 853 to 748. [2018-12-03 16:12:13,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 748 states. [2018-12-03 16:12:13,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 748 states to 748 states and 1258 transitions. [2018-12-03 16:12:13,352 INFO L78 Accepts]: Start accepts. Automaton has 748 states and 1258 transitions. Word has length 13 [2018-12-03 16:12:13,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:13,353 INFO L480 AbstractCegarLoop]: Abstraction has 748 states and 1258 transitions. [2018-12-03 16:12:13,353 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:12:13,353 INFO L276 IsEmpty]: Start isEmpty. Operand 748 states and 1258 transitions. [2018-12-03 16:12:13,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 16:12:13,354 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:13,354 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:13,354 INFO L423 AbstractCegarLoop]: === Iteration 25 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:13,354 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:13,355 INFO L82 PathProgramCache]: Analyzing trace with hash -63701769, now seen corresponding path program 1 times [2018-12-03 16:12:13,355 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:13,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:13,355 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:13,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:13,356 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:13,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:13,839 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:13,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:13,840 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:13,840 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 16:12:13,840 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [21], [22], [25], [29], [32], [65], [67], [72] [2018-12-03 16:12:13,841 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:13,841 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:13,888 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:13,889 INFO L272 AbstractInterpreter]: Visited 12 different actions 29 times. Merged at 9 different actions 14 times. Widened at 1 different actions 1 times. Found 5 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 16:12:13,919 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:13,919 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:13,919 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:13,919 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 16:12:13,934 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:13,934 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:13,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:13,955 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:14,468 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 [2018-12-03 16:12:14,619 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 16:12:14,620 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:14,710 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:14,730 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-12-03 16:12:14,730 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [6, 8] total 16 [2018-12-03 16:12:14,730 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:12:14,731 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:12:14,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:12:14,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2018-12-03 16:12:14,731 INFO L87 Difference]: Start difference. First operand 748 states and 1258 transitions. Second operand 7 states. [2018-12-03 16:12:15,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:15,043 INFO L93 Difference]: Finished difference Result 1630 states and 2731 transitions. [2018-12-03 16:12:15,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 16:12:15,043 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-12-03 16:12:15,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:15,046 INFO L225 Difference]: With dead ends: 1630 [2018-12-03 16:12:15,047 INFO L226 Difference]: Without dead ends: 877 [2018-12-03 16:12:15,048 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2018-12-03 16:12:15,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 877 states. [2018-12-03 16:12:15,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 877 to 844. [2018-12-03 16:12:15,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 844 states. [2018-12-03 16:12:15,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 844 states to 844 states and 1405 transitions. [2018-12-03 16:12:15,241 INFO L78 Accepts]: Start accepts. Automaton has 844 states and 1405 transitions. Word has length 13 [2018-12-03 16:12:15,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:15,241 INFO L480 AbstractCegarLoop]: Abstraction has 844 states and 1405 transitions. [2018-12-03 16:12:15,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:12:15,241 INFO L276 IsEmpty]: Start isEmpty. Operand 844 states and 1405 transitions. [2018-12-03 16:12:15,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 16:12:15,242 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:15,242 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:15,242 INFO L423 AbstractCegarLoop]: === Iteration 26 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:15,243 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:15,243 INFO L82 PathProgramCache]: Analyzing trace with hash 1761298639, now seen corresponding path program 1 times [2018-12-03 16:12:15,243 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:15,243 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:15,244 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:15,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:15,244 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:15,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:15,454 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:15,454 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:15,454 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:15,454 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 16:12:15,455 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [56], [57], [58], [61], [65], [67], [70] [2018-12-03 16:12:15,456 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:15,456 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:15,471 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:15,471 INFO L272 AbstractInterpreter]: Visited 12 different actions 23 times. Merged at 7 different actions 8 times. Never widened. Found 5 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 16:12:15,508 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:15,508 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:15,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:15,508 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 16:12:15,522 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:15,522 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:15,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:15,537 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:15,782 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:15,782 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:15,808 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:15,835 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:15,836 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 9 [2018-12-03 16:12:15,836 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:15,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-03 16:12:15,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-03 16:12:15,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2018-12-03 16:12:15,837 INFO L87 Difference]: Start difference. First operand 844 states and 1405 transitions. Second operand 10 states. [2018-12-03 16:12:16,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:16,691 INFO L93 Difference]: Finished difference Result 974 states and 1593 transitions. [2018-12-03 16:12:16,691 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 16:12:16,691 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2018-12-03 16:12:16,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:16,695 INFO L225 Difference]: With dead ends: 974 [2018-12-03 16:12:16,695 INFO L226 Difference]: Without dead ends: 972 [2018-12-03 16:12:16,696 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 17 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=147, Invalid=555, Unknown=0, NotChecked=0, Total=702 [2018-12-03 16:12:16,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 972 states. [2018-12-03 16:12:16,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 972 to 861. [2018-12-03 16:12:16,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 861 states. [2018-12-03 16:12:16,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 861 states to 861 states and 1430 transitions. [2018-12-03 16:12:16,888 INFO L78 Accepts]: Start accepts. Automaton has 861 states and 1430 transitions. Word has length 13 [2018-12-03 16:12:16,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:16,888 INFO L480 AbstractCegarLoop]: Abstraction has 861 states and 1430 transitions. [2018-12-03 16:12:16,888 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-03 16:12:16,888 INFO L276 IsEmpty]: Start isEmpty. Operand 861 states and 1430 transitions. [2018-12-03 16:12:16,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 16:12:16,889 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:16,889 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:16,889 INFO L423 AbstractCegarLoop]: === Iteration 27 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:16,889 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:16,889 INFO L82 PathProgramCache]: Analyzing trace with hash 1799471129, now seen corresponding path program 1 times [2018-12-03 16:12:16,890 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:16,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:16,890 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:16,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:16,890 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:16,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:17,089 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:17,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:17,090 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:17,090 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 16:12:17,090 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [45], [46], [47], [50], [56], [58], [63] [2018-12-03 16:12:17,092 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:17,092 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:17,097 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:17,098 INFO L272 AbstractInterpreter]: Visited 12 different actions 13 times. Merged at 1 different actions 1 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:12:17,099 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:17,099 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:17,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:17,099 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 16:12:17,108 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:17,108 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:17,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:17,125 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:17,235 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:17,235 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:17,301 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:17,320 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-12-03 16:12:17,320 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [8] total 17 [2018-12-03 16:12:17,320 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:12:17,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:12:17,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:12:17,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2018-12-03 16:12:17,321 INFO L87 Difference]: Start difference. First operand 861 states and 1430 transitions. Second operand 7 states. [2018-12-03 16:12:17,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:17,856 INFO L93 Difference]: Finished difference Result 2016 states and 3328 transitions. [2018-12-03 16:12:17,857 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 16:12:17,857 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-12-03 16:12:17,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:17,861 INFO L225 Difference]: With dead ends: 2016 [2018-12-03 16:12:17,861 INFO L226 Difference]: Without dead ends: 1157 [2018-12-03 16:12:17,862 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2018-12-03 16:12:17,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1157 states. [2018-12-03 16:12:18,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1157 to 932. [2018-12-03 16:12:18,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 932 states. [2018-12-03 16:12:18,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 932 states to 932 states and 1549 transitions. [2018-12-03 16:12:18,032 INFO L78 Accepts]: Start accepts. Automaton has 932 states and 1549 transitions. Word has length 13 [2018-12-03 16:12:18,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:18,032 INFO L480 AbstractCegarLoop]: Abstraction has 932 states and 1549 transitions. [2018-12-03 16:12:18,032 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:12:18,032 INFO L276 IsEmpty]: Start isEmpty. Operand 932 states and 1549 transitions. [2018-12-03 16:12:18,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 16:12:18,033 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:18,033 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:18,033 INFO L423 AbstractCegarLoop]: === Iteration 28 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:18,033 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:18,033 INFO L82 PathProgramCache]: Analyzing trace with hash 267374077, now seen corresponding path program 1 times [2018-12-03 16:12:18,033 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:18,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:18,034 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:18,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:18,034 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:18,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:18,104 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:18,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:18,104 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:18,104 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 16:12:18,105 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [58], [61], [65], [66], [67], [70] [2018-12-03 16:12:18,106 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:18,106 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:18,119 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:18,119 INFO L272 AbstractInterpreter]: Visited 12 different actions 23 times. Merged at 7 different actions 8 times. Never widened. Found 5 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 16:12:18,130 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:18,130 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:18,130 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:18,130 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 16:12:18,141 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:18,141 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:18,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:18,147 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:18,194 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:18,194 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:18,221 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:18,240 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:18,240 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 9 [2018-12-03 16:12:18,240 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:18,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-03 16:12:18,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-03 16:12:18,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2018-12-03 16:12:18,241 INFO L87 Difference]: Start difference. First operand 932 states and 1549 transitions. Second operand 10 states. [2018-12-03 16:12:18,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:18,966 INFO L93 Difference]: Finished difference Result 1072 states and 1761 transitions. [2018-12-03 16:12:18,966 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 16:12:18,966 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2018-12-03 16:12:18,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:18,970 INFO L225 Difference]: With dead ends: 1072 [2018-12-03 16:12:18,970 INFO L226 Difference]: Without dead ends: 1070 [2018-12-03 16:12:18,971 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 17 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=147, Invalid=555, Unknown=0, NotChecked=0, Total=702 [2018-12-03 16:12:18,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1070 states. [2018-12-03 16:12:19,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1070 to 930. [2018-12-03 16:12:19,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 930 states. [2018-12-03 16:12:19,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 930 states to 930 states and 1547 transitions. [2018-12-03 16:12:19,180 INFO L78 Accepts]: Start accepts. Automaton has 930 states and 1547 transitions. Word has length 13 [2018-12-03 16:12:19,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:19,180 INFO L480 AbstractCegarLoop]: Abstraction has 930 states and 1547 transitions. [2018-12-03 16:12:19,180 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-03 16:12:19,180 INFO L276 IsEmpty]: Start isEmpty. Operand 930 states and 1547 transitions. [2018-12-03 16:12:19,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 16:12:19,181 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:19,181 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:19,182 INFO L423 AbstractCegarLoop]: === Iteration 29 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:19,182 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:19,182 INFO L82 PathProgramCache]: Analyzing trace with hash 290277111, now seen corresponding path program 1 times [2018-12-03 16:12:19,182 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:19,183 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:19,183 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:19,183 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:19,183 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:19,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:19,325 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:19,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:19,325 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:19,326 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 16:12:19,326 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [21], [22], [25], [38], [41], [65], [67], [72] [2018-12-03 16:12:19,327 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:19,327 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:19,333 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:19,333 INFO L272 AbstractInterpreter]: Visited 12 different actions 13 times. Merged at 1 different actions 1 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:12:19,353 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:19,353 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:19,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:19,353 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 16:12:19,362 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:19,362 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:19,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:19,370 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:19,747 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:19,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:19,932 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:19,951 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-12-03 16:12:19,951 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [8] total 17 [2018-12-03 16:12:19,952 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:12:19,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:12:19,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:12:19,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2018-12-03 16:12:19,952 INFO L87 Difference]: Start difference. First operand 930 states and 1547 transitions. Second operand 7 states. [2018-12-03 16:12:20,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:20,499 INFO L93 Difference]: Finished difference Result 2178 states and 3577 transitions. [2018-12-03 16:12:20,499 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 16:12:20,499 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-12-03 16:12:20,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:20,504 INFO L225 Difference]: With dead ends: 2178 [2018-12-03 16:12:20,504 INFO L226 Difference]: Without dead ends: 1241 [2018-12-03 16:12:20,505 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2018-12-03 16:12:20,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1241 states. [2018-12-03 16:12:20,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1241 to 979. [2018-12-03 16:12:20,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 979 states. [2018-12-03 16:12:20,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 979 states to 979 states and 1621 transitions. [2018-12-03 16:12:20,697 INFO L78 Accepts]: Start accepts. Automaton has 979 states and 1621 transitions. Word has length 13 [2018-12-03 16:12:20,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:20,698 INFO L480 AbstractCegarLoop]: Abstraction has 979 states and 1621 transitions. [2018-12-03 16:12:20,698 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:12:20,698 INFO L276 IsEmpty]: Start isEmpty. Operand 979 states and 1621 transitions. [2018-12-03 16:12:20,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 16:12:20,698 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:20,698 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:20,699 INFO L423 AbstractCegarLoop]: === Iteration 30 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:20,699 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:20,699 INFO L82 PathProgramCache]: Analyzing trace with hash 2115278289, now seen corresponding path program 1 times [2018-12-03 16:12:20,699 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:20,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:20,700 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:20,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:20,700 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:20,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:20,817 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 16:12:20,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:20,818 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:20,818 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 16:12:20,818 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [21], [38], [41], [56], [58], [61], [65], [67], [72] [2018-12-03 16:12:20,819 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:20,820 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:20,827 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:20,828 INFO L272 AbstractInterpreter]: Visited 13 different actions 18 times. Merged at 4 different actions 4 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 16:12:20,838 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:20,838 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:20,838 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:20,839 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 16:12:20,847 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:20,847 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:20,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:20,854 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:20,950 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 16:12:20,950 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:21,013 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 16:12:21,033 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-12-03 16:12:21,033 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [7, 7] total 16 [2018-12-03 16:12:21,033 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:12:21,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:12:21,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:12:21,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2018-12-03 16:12:21,034 INFO L87 Difference]: Start difference. First operand 979 states and 1621 transitions. Second operand 7 states. [2018-12-03 16:12:21,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:21,444 INFO L93 Difference]: Finished difference Result 2106 states and 3472 transitions. [2018-12-03 16:12:21,444 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 16:12:21,444 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-12-03 16:12:21,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:21,448 INFO L225 Difference]: With dead ends: 2106 [2018-12-03 16:12:21,448 INFO L226 Difference]: Without dead ends: 1115 [2018-12-03 16:12:21,450 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:12:21,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1115 states. [2018-12-03 16:12:21,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1115 to 1011. [2018-12-03 16:12:21,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1011 states. [2018-12-03 16:12:21,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1011 states to 1011 states and 1656 transitions. [2018-12-03 16:12:21,647 INFO L78 Accepts]: Start accepts. Automaton has 1011 states and 1656 transitions. Word has length 13 [2018-12-03 16:12:21,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:21,647 INFO L480 AbstractCegarLoop]: Abstraction has 1011 states and 1656 transitions. [2018-12-03 16:12:21,647 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:12:21,647 INFO L276 IsEmpty]: Start isEmpty. Operand 1011 states and 1656 transitions. [2018-12-03 16:12:21,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 16:12:21,648 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:21,648 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:21,648 INFO L423 AbstractCegarLoop]: === Iteration 31 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:21,648 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:21,648 INFO L82 PathProgramCache]: Analyzing trace with hash -2141517287, now seen corresponding path program 1 times [2018-12-03 16:12:21,648 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:21,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:21,649 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:21,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:21,649 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:21,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:21,730 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:21,730 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:21,730 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:21,730 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 16:12:21,730 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [45], [46], [47], [50], [56], [58], [63] [2018-12-03 16:12:21,732 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:21,732 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:21,751 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:21,751 INFO L272 AbstractInterpreter]: Visited 12 different actions 29 times. Merged at 9 different actions 14 times. Widened at 1 different actions 1 times. Found 5 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 16:12:21,759 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:21,759 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:21,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:21,760 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 16:12:21,767 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:21,768 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:21,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:21,779 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:21,862 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 16:12:21,862 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:21,916 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:21,935 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-12-03 16:12:21,935 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [6, 7] total 15 [2018-12-03 16:12:21,935 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:12:21,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:12:21,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:12:21,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2018-12-03 16:12:21,936 INFO L87 Difference]: Start difference. First operand 1011 states and 1656 transitions. Second operand 7 states. [2018-12-03 16:12:22,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:22,264 INFO L93 Difference]: Finished difference Result 1334 states and 2144 transitions. [2018-12-03 16:12:22,264 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 16:12:22,264 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-12-03 16:12:22,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:22,268 INFO L225 Difference]: With dead ends: 1334 [2018-12-03 16:12:22,268 INFO L226 Difference]: Without dead ends: 1056 [2018-12-03 16:12:22,269 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2018-12-03 16:12:22,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1056 states. [2018-12-03 16:12:22,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1056 to 929. [2018-12-03 16:12:22,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 929 states. [2018-12-03 16:12:22,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 929 states to 929 states and 1514 transitions. [2018-12-03 16:12:22,457 INFO L78 Accepts]: Start accepts. Automaton has 929 states and 1514 transitions. Word has length 13 [2018-12-03 16:12:22,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:22,458 INFO L480 AbstractCegarLoop]: Abstraction has 929 states and 1514 transitions. [2018-12-03 16:12:22,458 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:12:22,458 INFO L276 IsEmpty]: Start isEmpty. Operand 929 states and 1514 transitions. [2018-12-03 16:12:22,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 16:12:22,458 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:22,458 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:22,459 INFO L423 AbstractCegarLoop]: === Iteration 32 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:22,459 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:22,459 INFO L82 PathProgramCache]: Analyzing trace with hash 2129075237, now seen corresponding path program 1 times [2018-12-03 16:12:22,459 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:22,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:22,460 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:22,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:22,460 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:22,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:22,527 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:22,527 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:22,527 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:22,527 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 16:12:22,528 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [25], [45], [47], [52] [2018-12-03 16:12:22,529 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:22,529 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:22,541 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:22,541 INFO L272 AbstractInterpreter]: Visited 12 different actions 23 times. Merged at 9 different actions 10 times. Never widened. Found 3 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 16:12:22,565 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:22,565 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:22,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:22,565 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 16:12:22,573 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:22,574 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:22,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:22,587 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:22,663 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:22,663 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:22,706 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:22,725 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-12-03 16:12:22,725 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [8] total 16 [2018-12-03 16:12:22,725 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:12:22,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:12:22,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:12:22,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2018-12-03 16:12:22,726 INFO L87 Difference]: Start difference. First operand 929 states and 1514 transitions. Second operand 7 states. [2018-12-03 16:12:23,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:23,453 INFO L93 Difference]: Finished difference Result 2558 states and 4101 transitions. [2018-12-03 16:12:23,453 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 16:12:23,453 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-12-03 16:12:23,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:23,459 INFO L225 Difference]: With dead ends: 2558 [2018-12-03 16:12:23,459 INFO L226 Difference]: Without dead ends: 1617 [2018-12-03 16:12:23,461 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=137, Invalid=513, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:12:23,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1617 states. [2018-12-03 16:12:23,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1617 to 1096. [2018-12-03 16:12:23,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1096 states. [2018-12-03 16:12:23,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1096 states to 1096 states and 1771 transitions. [2018-12-03 16:12:23,719 INFO L78 Accepts]: Start accepts. Automaton has 1096 states and 1771 transitions. Word has length 13 [2018-12-03 16:12:23,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:23,719 INFO L480 AbstractCegarLoop]: Abstraction has 1096 states and 1771 transitions. [2018-12-03 16:12:23,719 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:12:23,719 INFO L276 IsEmpty]: Start isEmpty. Operand 1096 states and 1771 transitions. [2018-12-03 16:12:23,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-12-03 16:12:23,720 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:23,721 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:23,721 INFO L423 AbstractCegarLoop]: === Iteration 33 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:23,721 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:23,721 INFO L82 PathProgramCache]: Analyzing trace with hash -1374164806, now seen corresponding path program 1 times [2018-12-03 16:12:23,721 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:23,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:23,722 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:23,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:23,722 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:23,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:23,826 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:23,827 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:23,827 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:23,827 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-12-03 16:12:23,827 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [45], [46], [56], [58], [63], [65], [67], [72] [2018-12-03 16:12:23,828 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:23,829 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:23,837 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:23,837 INFO L272 AbstractInterpreter]: Visited 13 different actions 20 times. Merged at 6 different actions 6 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 16:12:23,857 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:23,857 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:23,857 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:23,857 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 16:12:23,865 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:23,866 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:23,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:23,890 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:23,962 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:23,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:24,028 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:24,047 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:24,047 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6, 6] total 19 [2018-12-03 16:12:24,047 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:24,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 16:12:24,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 16:12:24,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=324, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:12:24,048 INFO L87 Difference]: Start difference. First operand 1096 states and 1771 transitions. Second operand 15 states. [2018-12-03 16:12:25,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:25,474 INFO L93 Difference]: Finished difference Result 1259 states and 2012 transitions. [2018-12-03 16:12:25,474 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 16:12:25,474 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 15 [2018-12-03 16:12:25,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:25,478 INFO L225 Difference]: With dead ends: 1259 [2018-12-03 16:12:25,479 INFO L226 Difference]: Without dead ends: 1257 [2018-12-03 16:12:25,480 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=331, Invalid=1391, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 16:12:25,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1257 states. [2018-12-03 16:12:25,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1257 to 1090. [2018-12-03 16:12:25,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1090 states. [2018-12-03 16:12:25,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1090 states to 1090 states and 1756 transitions. [2018-12-03 16:12:25,728 INFO L78 Accepts]: Start accepts. Automaton has 1090 states and 1756 transitions. Word has length 15 [2018-12-03 16:12:25,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:25,728 INFO L480 AbstractCegarLoop]: Abstraction has 1090 states and 1756 transitions. [2018-12-03 16:12:25,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 16:12:25,728 INFO L276 IsEmpty]: Start isEmpty. Operand 1090 states and 1756 transitions. [2018-12-03 16:12:25,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-12-03 16:12:25,729 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:25,729 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:25,730 INFO L423 AbstractCegarLoop]: === Iteration 34 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:25,730 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:25,730 INFO L82 PathProgramCache]: Analyzing trace with hash 1511389740, now seen corresponding path program 1 times [2018-12-03 16:12:25,730 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:25,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:25,731 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:25,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:25,731 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:25,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:25,983 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:25,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:25,983 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:25,983 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-12-03 16:12:25,984 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [21], [38], [41], [56], [58], [63], [65], [67], [72] [2018-12-03 16:12:25,984 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:25,985 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:25,994 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:25,995 INFO L272 AbstractInterpreter]: Visited 13 different actions 20 times. Merged at 6 different actions 6 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 16:12:26,009 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:26,010 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:26,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:26,010 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 16:12:26,018 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:26,019 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:26,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:26,026 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:26,069 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:26,069 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:26,568 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:26,586 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:26,587 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 16 [2018-12-03 16:12:26,587 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:26,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 16:12:26,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 16:12:26,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2018-12-03 16:12:26,588 INFO L87 Difference]: Start difference. First operand 1090 states and 1756 transitions. Second operand 12 states. [2018-12-03 16:12:27,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:27,700 INFO L93 Difference]: Finished difference Result 1232 states and 1960 transitions. [2018-12-03 16:12:27,700 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 16:12:27,700 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 15 [2018-12-03 16:12:27,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:27,705 INFO L225 Difference]: With dead ends: 1232 [2018-12-03 16:12:27,705 INFO L226 Difference]: Without dead ends: 1230 [2018-12-03 16:12:27,706 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=186, Invalid=744, Unknown=0, NotChecked=0, Total=930 [2018-12-03 16:12:27,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1230 states. [2018-12-03 16:12:27,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1230 to 1086. [2018-12-03 16:12:27,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1086 states. [2018-12-03 16:12:27,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1086 states to 1086 states and 1745 transitions. [2018-12-03 16:12:27,992 INFO L78 Accepts]: Start accepts. Automaton has 1086 states and 1745 transitions. Word has length 15 [2018-12-03 16:12:27,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:27,992 INFO L480 AbstractCegarLoop]: Abstraction has 1086 states and 1745 transitions. [2018-12-03 16:12:27,992 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 16:12:27,992 INFO L276 IsEmpty]: Start isEmpty. Operand 1086 states and 1745 transitions. [2018-12-03 16:12:27,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 16:12:27,993 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:27,993 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:27,993 INFO L423 AbstractCegarLoop]: === Iteration 35 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:27,994 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:27,994 INFO L82 PathProgramCache]: Analyzing trace with hash -474679190, now seen corresponding path program 1 times [2018-12-03 16:12:27,994 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:27,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:27,995 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:27,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:27,995 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:27,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:28,079 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:28,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:28,079 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:28,080 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 16:12:28,080 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [25], [27], [45], [46], [47], [50] [2018-12-03 16:12:28,080 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:28,081 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:28,093 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:28,093 INFO L272 AbstractInterpreter]: Visited 13 different actions 24 times. Merged at 9 different actions 10 times. Never widened. Found 4 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 16:12:28,135 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:28,135 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:28,136 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:28,136 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 16:12:28,158 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:28,159 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:28,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:28,167 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:28,192 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:28,192 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:28,235 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:28,255 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:28,255 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 15 [2018-12-03 16:12:28,255 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:28,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 16:12:28,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 16:12:28,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2018-12-03 16:12:28,256 INFO L87 Difference]: Start difference. First operand 1086 states and 1745 transitions. Second operand 11 states. [2018-12-03 16:12:28,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:28,972 INFO L93 Difference]: Finished difference Result 1212 states and 1935 transitions. [2018-12-03 16:12:28,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 16:12:28,972 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-03 16:12:28,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:28,976 INFO L225 Difference]: With dead ends: 1212 [2018-12-03 16:12:28,977 INFO L226 Difference]: Without dead ends: 1210 [2018-12-03 16:12:28,977 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=160, Invalid=490, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:12:28,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1210 states. [2018-12-03 16:12:29,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1210 to 1087. [2018-12-03 16:12:29,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1087 states. [2018-12-03 16:12:29,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1087 states to 1087 states and 1746 transitions. [2018-12-03 16:12:29,231 INFO L78 Accepts]: Start accepts. Automaton has 1087 states and 1746 transitions. Word has length 16 [2018-12-03 16:12:29,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:29,231 INFO L480 AbstractCegarLoop]: Abstraction has 1087 states and 1746 transitions. [2018-12-03 16:12:29,231 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 16:12:29,232 INFO L276 IsEmpty]: Start isEmpty. Operand 1087 states and 1746 transitions. [2018-12-03 16:12:29,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 16:12:29,233 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:29,233 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:29,233 INFO L423 AbstractCegarLoop]: === Iteration 36 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:29,233 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:29,233 INFO L82 PathProgramCache]: Analyzing trace with hash -1561364496, now seen corresponding path program 1 times [2018-12-03 16:12:29,233 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:29,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:29,234 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:29,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:29,235 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:29,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:29,302 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:12:29,303 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:29,303 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:29,303 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 16:12:29,303 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [25], [29], [32], [56], [57], [58], [61], [65], [67], [70] [2018-12-03 16:12:29,304 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:29,304 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:29,316 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:29,316 INFO L272 AbstractInterpreter]: Visited 15 different actions 29 times. Merged at 9 different actions 10 times. Never widened. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 16:12:29,351 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:29,351 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:29,351 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:29,352 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 16:12:29,371 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:29,371 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:29,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:29,378 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:29,412 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:12:29,412 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:29,441 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:12:29,460 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:29,460 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-12-03 16:12:29,460 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:29,460 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 16:12:29,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 16:12:29,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2018-12-03 16:12:29,461 INFO L87 Difference]: Start difference. First operand 1087 states and 1746 transitions. Second operand 11 states. [2018-12-03 16:12:30,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:30,524 INFO L93 Difference]: Finished difference Result 1275 states and 2024 transitions. [2018-12-03 16:12:30,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-12-03 16:12:30,524 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-03 16:12:30,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:30,530 INFO L225 Difference]: With dead ends: 1275 [2018-12-03 16:12:30,530 INFO L226 Difference]: Without dead ends: 1272 [2018-12-03 16:12:30,531 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 22 SyntacticMatches, 5 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=781, Unknown=0, NotChecked=0, Total=992 [2018-12-03 16:12:30,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1272 states. [2018-12-03 16:12:30,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1272 to 1110. [2018-12-03 16:12:30,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1110 states. [2018-12-03 16:12:30,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1110 states to 1110 states and 1779 transitions. [2018-12-03 16:12:30,806 INFO L78 Accepts]: Start accepts. Automaton has 1110 states and 1779 transitions. Word has length 16 [2018-12-03 16:12:30,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:30,806 INFO L480 AbstractCegarLoop]: Abstraction has 1110 states and 1779 transitions. [2018-12-03 16:12:30,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 16:12:30,806 INFO L276 IsEmpty]: Start isEmpty. Operand 1110 states and 1779 transitions. [2018-12-03 16:12:30,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 16:12:30,807 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:30,807 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:30,807 INFO L423 AbstractCegarLoop]: === Iteration 37 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:30,808 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:30,808 INFO L82 PathProgramCache]: Analyzing trace with hash 324711724, now seen corresponding path program 1 times [2018-12-03 16:12:30,808 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:30,808 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:30,809 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:30,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:30,809 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:30,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:30,920 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:30,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:30,921 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:30,921 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 16:12:30,921 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [25], [29], [32], [45], [46], [47], [50], [56], [58], [63] [2018-12-03 16:12:30,922 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:30,922 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:30,928 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:30,928 INFO L272 AbstractInterpreter]: Visited 15 different actions 20 times. Merged at 4 different actions 4 times. Never widened. Found 3 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 16:12:30,936 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:30,936 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:30,936 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:30,936 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 16:12:30,944 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:30,945 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:30,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:30,950 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:31,046 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:31,046 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:31,163 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:31,182 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:31,183 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 16 [2018-12-03 16:12:31,183 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:31,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 16:12:31,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 16:12:31,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2018-12-03 16:12:31,184 INFO L87 Difference]: Start difference. First operand 1110 states and 1779 transitions. Second operand 12 states. [2018-12-03 16:12:32,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:32,228 INFO L93 Difference]: Finished difference Result 1317 states and 2102 transitions. [2018-12-03 16:12:32,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 16:12:32,229 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 16 [2018-12-03 16:12:32,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:32,233 INFO L225 Difference]: With dead ends: 1317 [2018-12-03 16:12:32,233 INFO L226 Difference]: Without dead ends: 1315 [2018-12-03 16:12:32,234 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=192, Invalid=738, Unknown=0, NotChecked=0, Total=930 [2018-12-03 16:12:32,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1315 states. [2018-12-03 16:12:32,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1315 to 1128. [2018-12-03 16:12:32,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1128 states. [2018-12-03 16:12:32,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1128 states to 1128 states and 1809 transitions. [2018-12-03 16:12:32,495 INFO L78 Accepts]: Start accepts. Automaton has 1128 states and 1809 transitions. Word has length 16 [2018-12-03 16:12:32,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:32,495 INFO L480 AbstractCegarLoop]: Abstraction has 1128 states and 1809 transitions. [2018-12-03 16:12:32,495 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 16:12:32,495 INFO L276 IsEmpty]: Start isEmpty. Operand 1128 states and 1809 transitions. [2018-12-03 16:12:32,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 16:12:32,496 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:32,496 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:32,496 INFO L423 AbstractCegarLoop]: === Iteration 38 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:32,497 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:32,497 INFO L82 PathProgramCache]: Analyzing trace with hash -767609008, now seen corresponding path program 1 times [2018-12-03 16:12:32,497 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:32,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:32,498 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:32,498 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:32,498 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:32,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:33,110 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:33,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:33,111 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:33,111 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 16:12:33,111 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [45], [46], [56], [58], [61], [63], [65], [67], [70] [2018-12-03 16:12:33,112 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:33,112 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:33,127 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:33,128 INFO L272 AbstractInterpreter]: Visited 14 different actions 26 times. Merged at 7 different actions 8 times. Never widened. Found 6 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 16:12:33,169 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:33,169 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:33,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:33,169 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 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 16:12:33,189 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:33,189 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:33,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:33,211 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:33,474 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:33,474 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:33,526 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:33,545 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:33,545 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2018-12-03 16:12:33,546 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:33,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 16:12:33,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 16:12:33,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2018-12-03 16:12:33,546 INFO L87 Difference]: Start difference. First operand 1128 states and 1809 transitions. Second operand 11 states. [2018-12-03 16:12:34,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:34,425 INFO L93 Difference]: Finished difference Result 1251 states and 1991 transitions. [2018-12-03 16:12:34,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 16:12:34,426 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-03 16:12:34,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:34,430 INFO L225 Difference]: With dead ends: 1251 [2018-12-03 16:12:34,430 INFO L226 Difference]: Without dead ends: 1249 [2018-12-03 16:12:34,430 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:12:34,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1249 states. [2018-12-03 16:12:34,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1249 to 1119. [2018-12-03 16:12:34,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1119 states. [2018-12-03 16:12:34,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1119 states to 1119 states and 1794 transitions. [2018-12-03 16:12:34,687 INFO L78 Accepts]: Start accepts. Automaton has 1119 states and 1794 transitions. Word has length 16 [2018-12-03 16:12:34,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:34,687 INFO L480 AbstractCegarLoop]: Abstraction has 1119 states and 1794 transitions. [2018-12-03 16:12:34,687 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 16:12:34,687 INFO L276 IsEmpty]: Start isEmpty. Operand 1119 states and 1794 transitions. [2018-12-03 16:12:34,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 16:12:34,688 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:34,688 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:34,689 INFO L423 AbstractCegarLoop]: === Iteration 39 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:34,689 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:34,689 INFO L82 PathProgramCache]: Analyzing trace with hash 646859569, now seen corresponding path program 1 times [2018-12-03 16:12:34,689 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:34,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:34,690 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:34,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:34,690 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:34,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:34,763 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:34,764 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:34,764 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:34,764 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 16:12:34,764 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [21], [22], [25], [38], [41], [65], [67], [70], [72] [2018-12-03 16:12:34,765 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:34,765 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:34,770 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:34,770 INFO L272 AbstractInterpreter]: Visited 13 different actions 15 times. Merged at 2 different actions 2 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 16:12:34,776 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:34,776 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:34,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:34,776 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 16:12:34,785 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:34,785 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:34,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:34,792 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:34,818 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:34,819 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:34,872 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:34,891 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:34,892 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 16 [2018-12-03 16:12:34,892 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:34,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 16:12:34,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 16:12:34,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2018-12-03 16:12:34,893 INFO L87 Difference]: Start difference. First operand 1119 states and 1794 transitions. Second operand 12 states. [2018-12-03 16:12:35,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:35,866 INFO L93 Difference]: Finished difference Result 1242 states and 1971 transitions. [2018-12-03 16:12:35,866 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 16:12:35,867 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 16 [2018-12-03 16:12:35,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:35,872 INFO L225 Difference]: With dead ends: 1242 [2018-12-03 16:12:35,872 INFO L226 Difference]: Without dead ends: 1240 [2018-12-03 16:12:35,872 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=182, Invalid=688, Unknown=0, NotChecked=0, Total=870 [2018-12-03 16:12:35,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1240 states. [2018-12-03 16:12:36,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1240 to 1137. [2018-12-03 16:12:36,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1137 states. [2018-12-03 16:12:36,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1137 states to 1137 states and 1825 transitions. [2018-12-03 16:12:36,140 INFO L78 Accepts]: Start accepts. Automaton has 1137 states and 1825 transitions. Word has length 16 [2018-12-03 16:12:36,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:36,140 INFO L480 AbstractCegarLoop]: Abstraction has 1137 states and 1825 transitions. [2018-12-03 16:12:36,140 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 16:12:36,140 INFO L276 IsEmpty]: Start isEmpty. Operand 1137 states and 1825 transitions. [2018-12-03 16:12:36,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 16:12:36,141 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:36,141 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:36,141 INFO L423 AbstractCegarLoop]: === Iteration 40 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:36,141 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:36,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1823107031, now seen corresponding path program 2 times [2018-12-03 16:12:36,141 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:36,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:36,142 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:36,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:36,142 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:36,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:36,225 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:12:36,225 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:36,225 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:36,225 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:12:36,226 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:12:36,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:36,226 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 16:12:36,235 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:12:36,235 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:12:36,243 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 16:12:36,243 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:12:36,245 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:36,287 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:12:36,287 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:36,318 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:12:36,336 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:36,337 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-12-03 16:12:36,337 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:36,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 16:12:36,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 16:12:36,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2018-12-03 16:12:36,337 INFO L87 Difference]: Start difference. First operand 1137 states and 1825 transitions. Second operand 11 states. [2018-12-03 16:12:37,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:37,377 INFO L93 Difference]: Finished difference Result 1321 states and 2096 transitions. [2018-12-03 16:12:37,378 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-12-03 16:12:37,378 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-03 16:12:37,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:37,383 INFO L225 Difference]: With dead ends: 1321 [2018-12-03 16:12:37,383 INFO L226 Difference]: Without dead ends: 1318 [2018-12-03 16:12:37,384 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 22 SyntacticMatches, 5 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=781, Unknown=0, NotChecked=0, Total=992 [2018-12-03 16:12:37,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1318 states. [2018-12-03 16:12:37,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1318 to 1159. [2018-12-03 16:12:37,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1159 states. [2018-12-03 16:12:37,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1159 states to 1159 states and 1857 transitions. [2018-12-03 16:12:37,657 INFO L78 Accepts]: Start accepts. Automaton has 1159 states and 1857 transitions. Word has length 16 [2018-12-03 16:12:37,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:37,657 INFO L480 AbstractCegarLoop]: Abstraction has 1159 states and 1857 transitions. [2018-12-03 16:12:37,657 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 16:12:37,657 INFO L276 IsEmpty]: Start isEmpty. Operand 1159 states and 1857 transitions. [2018-12-03 16:12:37,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 16:12:37,658 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:37,658 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:37,658 INFO L423 AbstractCegarLoop]: === Iteration 41 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:37,658 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:37,659 INFO L82 PathProgramCache]: Analyzing trace with hash -1823106549, now seen corresponding path program 1 times [2018-12-03 16:12:37,659 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:37,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:37,659 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:12:37,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:37,660 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:37,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:37,749 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:37,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:37,750 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:37,750 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 16:12:37,750 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [21], [38], [41], [56], [58], [61], [65], [67], [70], [72] [2018-12-03 16:12:37,751 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:37,751 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:37,761 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:37,761 INFO L272 AbstractInterpreter]: Visited 14 different actions 26 times. Merged at 7 different actions 8 times. Never widened. Found 6 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 16:12:37,802 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:37,802 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:37,802 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:37,802 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 16:12:37,817 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:37,817 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:37,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:37,836 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:37,914 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:37,914 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:37,969 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:37,989 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:37,990 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2018-12-03 16:12:37,990 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:37,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 16:12:37,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 16:12:37,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2018-12-03 16:12:37,991 INFO L87 Difference]: Start difference. First operand 1159 states and 1857 transitions. Second operand 11 states. [2018-12-03 16:12:38,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:38,836 INFO L93 Difference]: Finished difference Result 1262 states and 2003 transitions. [2018-12-03 16:12:38,837 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 16:12:38,837 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-03 16:12:38,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:38,840 INFO L225 Difference]: With dead ends: 1262 [2018-12-03 16:12:38,840 INFO L226 Difference]: Without dead ends: 1260 [2018-12-03 16:12:38,841 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:12:38,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1260 states. [2018-12-03 16:12:39,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1260 to 1163. [2018-12-03 16:12:39,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1163 states. [2018-12-03 16:12:39,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1163 states to 1163 states and 1864 transitions. [2018-12-03 16:12:39,120 INFO L78 Accepts]: Start accepts. Automaton has 1163 states and 1864 transitions. Word has length 16 [2018-12-03 16:12:39,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:39,120 INFO L480 AbstractCegarLoop]: Abstraction has 1163 states and 1864 transitions. [2018-12-03 16:12:39,120 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 16:12:39,120 INFO L276 IsEmpty]: Start isEmpty. Operand 1163 states and 1864 transitions. [2018-12-03 16:12:39,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 16:12:39,121 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:39,121 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:39,121 INFO L423 AbstractCegarLoop]: === Iteration 42 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:39,121 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:39,122 INFO L82 PathProgramCache]: Analyzing trace with hash -1462469629, now seen corresponding path program 1 times [2018-12-03 16:12:39,122 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:39,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:39,122 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:39,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:39,122 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:39,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:39,194 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:39,195 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:39,195 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:39,195 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 16:12:39,195 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [21], [22], [25], [38], [41], [45], [47], [50], [65], [67], [72] [2018-12-03 16:12:39,196 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:39,196 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:39,203 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:39,203 INFO L272 AbstractInterpreter]: Visited 15 different actions 20 times. Merged at 4 different actions 4 times. Never widened. Found 3 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 16:12:39,221 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:39,221 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:39,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:39,221 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 16:12:39,232 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:39,233 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:39,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:39,239 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:39,273 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:39,273 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:39,341 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:39,362 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:39,362 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 16 [2018-12-03 16:12:39,362 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:39,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 16:12:39,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 16:12:39,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2018-12-03 16:12:39,363 INFO L87 Difference]: Start difference. First operand 1163 states and 1864 transitions. Second operand 12 states. [2018-12-03 16:12:40,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:40,420 INFO L93 Difference]: Finished difference Result 1353 states and 2154 transitions. [2018-12-03 16:12:40,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 16:12:40,420 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 16 [2018-12-03 16:12:40,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:40,423 INFO L225 Difference]: With dead ends: 1353 [2018-12-03 16:12:40,424 INFO L226 Difference]: Without dead ends: 1351 [2018-12-03 16:12:40,424 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=738, Unknown=0, NotChecked=0, Total=930 [2018-12-03 16:12:40,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1351 states. [2018-12-03 16:12:40,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1351 to 1164. [2018-12-03 16:12:40,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1164 states. [2018-12-03 16:12:40,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1164 states to 1164 states and 1865 transitions. [2018-12-03 16:12:40,732 INFO L78 Accepts]: Start accepts. Automaton has 1164 states and 1865 transitions. Word has length 16 [2018-12-03 16:12:40,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:40,732 INFO L480 AbstractCegarLoop]: Abstraction has 1164 states and 1865 transitions. [2018-12-03 16:12:40,732 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 16:12:40,732 INFO L276 IsEmpty]: Start isEmpty. Operand 1164 states and 1865 transitions. [2018-12-03 16:12:40,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 16:12:40,733 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:40,733 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:40,733 INFO L423 AbstractCegarLoop]: === Iteration 43 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:40,734 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:40,734 INFO L82 PathProgramCache]: Analyzing trace with hash 362531549, now seen corresponding path program 1 times [2018-12-03 16:12:40,734 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:40,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:40,735 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:40,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:40,735 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:40,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:40,827 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:40,827 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:40,827 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:40,827 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 16:12:40,827 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [21], [38], [41], [45], [47], [50], [56], [58], [61], [65], [67], [72] [2018-12-03 16:12:40,828 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:40,829 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:40,839 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:40,840 INFO L272 AbstractInterpreter]: Visited 16 different actions 30 times. Merged at 9 different actions 10 times. Never widened. Found 6 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 16:12:40,873 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:40,874 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:40,874 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:40,874 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 16:12:40,885 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:40,885 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:40,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:40,906 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:41,109 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:41,109 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:41,267 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:41,286 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:41,287 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2018-12-03 16:12:41,287 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:41,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 16:12:41,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 16:12:41,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2018-12-03 16:12:41,287 INFO L87 Difference]: Start difference. First operand 1164 states and 1865 transitions. Second operand 11 states. [2018-12-03 16:12:42,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:42,127 INFO L93 Difference]: Finished difference Result 1272 states and 2019 transitions. [2018-12-03 16:12:42,127 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 16:12:42,127 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-03 16:12:42,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:42,129 INFO L225 Difference]: With dead ends: 1272 [2018-12-03 16:12:42,129 INFO L226 Difference]: Without dead ends: 1270 [2018-12-03 16:12:42,130 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=151, Invalid=551, Unknown=0, NotChecked=0, Total=702 [2018-12-03 16:12:42,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1270 states. [2018-12-03 16:12:42,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1270 to 1159. [2018-12-03 16:12:42,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1159 states. [2018-12-03 16:12:42,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1159 states to 1159 states and 1856 transitions. [2018-12-03 16:12:42,406 INFO L78 Accepts]: Start accepts. Automaton has 1159 states and 1856 transitions. Word has length 16 [2018-12-03 16:12:42,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:42,407 INFO L480 AbstractCegarLoop]: Abstraction has 1159 states and 1856 transitions. [2018-12-03 16:12:42,407 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 16:12:42,407 INFO L276 IsEmpty]: Start isEmpty. Operand 1159 states and 1856 transitions. [2018-12-03 16:12:42,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 16:12:42,407 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:42,408 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:42,408 INFO L423 AbstractCegarLoop]: === Iteration 44 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:42,408 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:42,408 INFO L82 PathProgramCache]: Analyzing trace with hash 376328497, now seen corresponding path program 1 times [2018-12-03 16:12:42,408 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:42,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:42,409 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:42,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:42,409 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:42,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:42,673 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:42,673 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:42,673 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:42,673 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-12-03 16:12:42,673 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [25], [45], [47], [50], [52] [2018-12-03 16:12:42,674 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:42,674 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:42,687 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:42,687 INFO L272 AbstractInterpreter]: Visited 13 different actions 24 times. Merged at 9 different actions 10 times. Never widened. Found 4 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 16:12:42,724 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:42,724 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:42,724 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:42,725 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 16:12:42,738 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:42,738 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:42,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:42,757 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:42,798 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:42,799 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:42,858 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:42,877 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:42,877 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 15 [2018-12-03 16:12:42,877 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:42,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 16:12:42,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 16:12:42,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2018-12-03 16:12:42,878 INFO L87 Difference]: Start difference. First operand 1159 states and 1856 transitions. Second operand 11 states. [2018-12-03 16:12:43,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:43,642 INFO L93 Difference]: Finished difference Result 1283 states and 2043 transitions. [2018-12-03 16:12:43,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 16:12:43,643 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-03 16:12:43,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:43,645 INFO L225 Difference]: With dead ends: 1283 [2018-12-03 16:12:43,645 INFO L226 Difference]: Without dead ends: 1281 [2018-12-03 16:12:43,645 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=160, Invalid=490, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:12:43,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1281 states. [2018-12-03 16:12:43,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1281 to 1157. [2018-12-03 16:12:43,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1157 states. [2018-12-03 16:12:43,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1157 states to 1157 states and 1853 transitions. [2018-12-03 16:12:43,920 INFO L78 Accepts]: Start accepts. Automaton has 1157 states and 1853 transitions. Word has length 16 [2018-12-03 16:12:43,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:43,920 INFO L480 AbstractCegarLoop]: Abstraction has 1157 states and 1853 transitions. [2018-12-03 16:12:43,920 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 16:12:43,920 INFO L276 IsEmpty]: Start isEmpty. Operand 1157 states and 1853 transitions. [2018-12-03 16:12:43,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 16:12:43,921 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:43,922 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:43,922 INFO L423 AbstractCegarLoop]: === Iteration 45 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:43,922 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:43,922 INFO L82 PathProgramCache]: Analyzing trace with hash -1354217275, now seen corresponding path program 1 times [2018-12-03 16:12:43,922 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:43,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:43,923 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:43,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:43,923 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:43,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:43,988 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:43,988 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:43,988 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:43,988 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-12-03 16:12:43,989 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [38], [41], [56], [58], [61], [63], [65], [66], [67], [70] [2018-12-03 16:12:43,990 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:43,990 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:44,000 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:44,000 INFO L272 AbstractInterpreter]: Visited 15 different actions 29 times. Merged at 9 different actions 10 times. Never widened. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 16:12:44,035 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:44,035 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:44,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:44,035 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 16:12:44,045 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:44,045 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:44,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:44,051 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:44,114 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:44,114 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:44,201 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:44,222 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:44,222 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 17 [2018-12-03 16:12:44,222 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:44,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 16:12:44,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 16:12:44,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2018-12-03 16:12:44,223 INFO L87 Difference]: Start difference. First operand 1157 states and 1853 transitions. Second operand 12 states. [2018-12-03 16:12:45,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:45,861 INFO L93 Difference]: Finished difference Result 1354 states and 2143 transitions. [2018-12-03 16:12:45,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 16:12:45,862 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 18 [2018-12-03 16:12:45,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:45,864 INFO L225 Difference]: With dead ends: 1354 [2018-12-03 16:12:45,864 INFO L226 Difference]: Without dead ends: 1352 [2018-12-03 16:12:45,865 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=292, Invalid=1190, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 16:12:45,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1352 states. [2018-12-03 16:12:46,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1352 to 1136. [2018-12-03 16:12:46,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1136 states. [2018-12-03 16:12:46,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1136 states to 1136 states and 1818 transitions. [2018-12-03 16:12:46,244 INFO L78 Accepts]: Start accepts. Automaton has 1136 states and 1818 transitions. Word has length 18 [2018-12-03 16:12:46,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:46,244 INFO L480 AbstractCegarLoop]: Abstraction has 1136 states and 1818 transitions. [2018-12-03 16:12:46,244 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 16:12:46,244 INFO L276 IsEmpty]: Start isEmpty. Operand 1136 states and 1818 transitions. [2018-12-03 16:12:46,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 16:12:46,245 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:46,245 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:46,245 INFO L423 AbstractCegarLoop]: === Iteration 46 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:46,245 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:46,245 INFO L82 PathProgramCache]: Analyzing trace with hash 1085218294, now seen corresponding path program 1 times [2018-12-03 16:12:46,245 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:46,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:46,246 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:46,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:46,246 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:46,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:46,451 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:46,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:46,452 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:46,452 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-12-03 16:12:46,452 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [27], [29], [32], [45], [46], [47], [50], [65], [67], [72] [2018-12-03 16:12:46,453 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:46,453 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:46,472 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:46,472 INFO L272 AbstractInterpreter]: Visited 17 different actions 47 times. Merged at 16 different actions 25 times. Widened at 1 different actions 1 times. Found 8 fixpoints after 5 different actions. Largest state had 0 variables. [2018-12-03 16:12:46,517 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:46,517 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:46,517 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:46,518 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 16:12:46,529 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:46,530 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:46,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:46,550 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:46,706 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:46,706 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:46,761 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:46,781 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-12-03 16:12:46,781 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [11] total 19 [2018-12-03 16:12:46,781 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:12:46,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:12:46,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:12:46,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=294, Unknown=0, NotChecked=0, Total=342 [2018-12-03 16:12:46,782 INFO L87 Difference]: Start difference. First operand 1136 states and 1818 transitions. Second operand 7 states. [2018-12-03 16:12:47,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:47,235 INFO L93 Difference]: Finished difference Result 1480 states and 2314 transitions. [2018-12-03 16:12:47,235 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 16:12:47,235 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2018-12-03 16:12:47,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:47,237 INFO L225 Difference]: With dead ends: 1480 [2018-12-03 16:12:47,237 INFO L226 Difference]: Without dead ends: 1197 [2018-12-03 16:12:47,238 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2018-12-03 16:12:47,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1197 states. [2018-12-03 16:12:47,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1197 to 960. [2018-12-03 16:12:47,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 960 states. [2018-12-03 16:12:47,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 960 states to 960 states and 1536 transitions. [2018-12-03 16:12:47,479 INFO L78 Accepts]: Start accepts. Automaton has 960 states and 1536 transitions. Word has length 18 [2018-12-03 16:12:47,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:47,480 INFO L480 AbstractCegarLoop]: Abstraction has 960 states and 1536 transitions. [2018-12-03 16:12:47,480 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:12:47,480 INFO L276 IsEmpty]: Start isEmpty. Operand 960 states and 1536 transitions. [2018-12-03 16:12:47,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 16:12:47,480 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:47,481 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:47,481 INFO L423 AbstractCegarLoop]: === Iteration 47 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:47,481 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:47,481 INFO L82 PathProgramCache]: Analyzing trace with hash 1597439053, now seen corresponding path program 1 times [2018-12-03 16:12:47,481 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:47,481 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:47,482 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:47,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:47,482 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:47,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:47,572 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:47,572 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:47,572 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:47,572 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-12-03 16:12:47,572 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [27], [29], [32], [45], [46], [56], [58], [61], [65], [67], [72] [2018-12-03 16:12:47,573 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:47,573 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:47,594 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:47,594 INFO L272 AbstractInterpreter]: Visited 18 different actions 50 times. Merged at 17 different actions 25 times. Widened at 1 different actions 1 times. Found 10 fixpoints after 6 different actions. Largest state had 0 variables. [2018-12-03 16:12:47,619 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:47,619 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:47,619 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:47,619 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 16:12:47,636 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:47,636 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:47,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:47,651 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:47,727 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:47,727 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:47,804 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:47,823 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-12-03 16:12:47,823 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [10, 7] total 19 [2018-12-03 16:12:47,823 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:12:47,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:12:47,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:12:47,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2018-12-03 16:12:47,824 INFO L87 Difference]: Start difference. First operand 960 states and 1536 transitions. Second operand 7 states. [2018-12-03 16:12:48,091 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2018-12-03 16:12:48,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:48,647 INFO L93 Difference]: Finished difference Result 1436 states and 2247 transitions. [2018-12-03 16:12:48,651 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 16:12:48,651 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2018-12-03 16:12:48,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:48,653 INFO L225 Difference]: With dead ends: 1436 [2018-12-03 16:12:48,653 INFO L226 Difference]: Without dead ends: 1141 [2018-12-03 16:12:48,654 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2018-12-03 16:12:48,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1141 states. [2018-12-03 16:12:49,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1141 to 956. [2018-12-03 16:12:49,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 956 states. [2018-12-03 16:12:49,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 956 states to 956 states and 1524 transitions. [2018-12-03 16:12:49,071 INFO L78 Accepts]: Start accepts. Automaton has 956 states and 1524 transitions. Word has length 18 [2018-12-03 16:12:49,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:49,071 INFO L480 AbstractCegarLoop]: Abstraction has 956 states and 1524 transitions. [2018-12-03 16:12:49,071 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:12:49,071 INFO L276 IsEmpty]: Start isEmpty. Operand 956 states and 1524 transitions. [2018-12-03 16:12:49,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 16:12:49,072 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:49,072 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:49,073 INFO L423 AbstractCegarLoop]: === Iteration 48 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:49,073 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:49,073 INFO L82 PathProgramCache]: Analyzing trace with hash -1672170852, now seen corresponding path program 1 times [2018-12-03 16:12:49,073 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:49,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:49,074 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:49,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:49,074 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:49,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:49,818 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:12:49,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:49,818 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:49,819 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-12-03 16:12:49,819 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [57], [58], [63], [65], [67], [70] [2018-12-03 16:12:49,820 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:49,820 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:49,835 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:49,835 INFO L272 AbstractInterpreter]: Visited 12 different actions 27 times. Merged at 9 different actions 12 times. Never widened. Found 5 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 16:12:49,860 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:49,860 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:49,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:49,860 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 16:12:49,871 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:49,871 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:49,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:49,878 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:49,985 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:49,985 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:50,099 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:50,127 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-12-03 16:12:50,127 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [9, 8] total 21 [2018-12-03 16:12:50,128 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:12:50,128 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 16:12:50,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 16:12:50,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=356, Unknown=0, NotChecked=0, Total=420 [2018-12-03 16:12:50,129 INFO L87 Difference]: Start difference. First operand 956 states and 1524 transitions. Second operand 8 states. [2018-12-03 16:12:51,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:51,229 INFO L93 Difference]: Finished difference Result 1440 states and 2248 transitions. [2018-12-03 16:12:51,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 16:12:51,229 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2018-12-03 16:12:51,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:51,232 INFO L225 Difference]: With dead ends: 1440 [2018-12-03 16:12:51,232 INFO L226 Difference]: Without dead ends: 1185 [2018-12-03 16:12:51,233 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=121, Invalid=635, Unknown=0, NotChecked=0, Total=756 [2018-12-03 16:12:51,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1185 states. [2018-12-03 16:12:51,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1185 to 1006. [2018-12-03 16:12:51,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1006 states. [2018-12-03 16:12:51,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1006 states to 1006 states and 1600 transitions. [2018-12-03 16:12:51,656 INFO L78 Accepts]: Start accepts. Automaton has 1006 states and 1600 transitions. Word has length 18 [2018-12-03 16:12:51,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:51,656 INFO L480 AbstractCegarLoop]: Abstraction has 1006 states and 1600 transitions. [2018-12-03 16:12:51,656 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 16:12:51,656 INFO L276 IsEmpty]: Start isEmpty. Operand 1006 states and 1600 transitions. [2018-12-03 16:12:51,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 16:12:51,657 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:51,658 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:51,658 INFO L423 AbstractCegarLoop]: === Iteration 49 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:51,658 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:51,658 INFO L82 PathProgramCache]: Analyzing trace with hash -1136854538, now seen corresponding path program 1 times [2018-12-03 16:12:51,658 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:51,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:51,659 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:51,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:51,659 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:51,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:51,786 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:51,786 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:51,787 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:51,787 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-12-03 16:12:51,787 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [27], [38], [41], [65], [67], [70], [72] [2018-12-03 16:12:51,788 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:51,789 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:51,809 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:51,809 INFO L272 AbstractInterpreter]: Visited 15 different actions 39 times. Merged at 14 different actions 21 times. Never widened. Found 6 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 16:12:51,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:51,848 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:51,848 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:51,848 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 16:12:51,866 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:51,866 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:51,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:51,887 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:52,044 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:52,044 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:52,125 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:52,144 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-12-03 16:12:52,145 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [9, 7] total 18 [2018-12-03 16:12:52,145 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:12:52,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:12:52,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:12:52,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2018-12-03 16:12:52,146 INFO L87 Difference]: Start difference. First operand 1006 states and 1600 transitions. Second operand 7 states. [2018-12-03 16:12:52,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:52,852 INFO L93 Difference]: Finished difference Result 1460 states and 2276 transitions. [2018-12-03 16:12:52,853 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 16:12:52,853 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2018-12-03 16:12:52,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:52,855 INFO L225 Difference]: With dead ends: 1460 [2018-12-03 16:12:52,855 INFO L226 Difference]: Without dead ends: 1193 [2018-12-03 16:12:52,856 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=86, Invalid=466, Unknown=0, NotChecked=0, Total=552 [2018-12-03 16:12:52,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1193 states. [2018-12-03 16:12:53,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1193 to 970. [2018-12-03 16:12:53,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 970 states. [2018-12-03 16:12:53,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 970 states to 970 states and 1538 transitions. [2018-12-03 16:12:53,158 INFO L78 Accepts]: Start accepts. Automaton has 970 states and 1538 transitions. Word has length 18 [2018-12-03 16:12:53,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:53,159 INFO L480 AbstractCegarLoop]: Abstraction has 970 states and 1538 transitions. [2018-12-03 16:12:53,159 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:12:53,159 INFO L276 IsEmpty]: Start isEmpty. Operand 970 states and 1538 transitions. [2018-12-03 16:12:53,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 16:12:53,159 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:53,159 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:53,160 INFO L423 AbstractCegarLoop]: === Iteration 50 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:53,160 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:53,160 INFO L82 PathProgramCache]: Analyzing trace with hash 975863549, now seen corresponding path program 1 times [2018-12-03 16:12:53,160 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:53,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:53,161 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:53,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:53,161 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:53,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:53,218 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:53,218 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:53,218 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:53,218 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-12-03 16:12:53,218 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [25], [27], [38], [41], [65], [67], [72] [2018-12-03 16:12:53,219 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:53,219 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:53,233 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:53,233 INFO L272 AbstractInterpreter]: Visited 15 different actions 38 times. Merged at 13 different actions 20 times. Never widened. Found 6 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 16:12:53,273 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:53,273 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:53,273 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:53,273 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 16:12:53,286 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:53,287 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:53,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:53,307 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:53,310 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:53,311 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:53,355 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:53,374 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:53,374 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2018-12-03 16:12:53,374 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:53,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:12:53,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:12:53,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2018-12-03 16:12:53,375 INFO L87 Difference]: Start difference. First operand 970 states and 1538 transitions. Second operand 7 states. [2018-12-03 16:12:54,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:54,099 INFO L93 Difference]: Finished difference Result 1508 states and 2311 transitions. [2018-12-03 16:12:54,099 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 16:12:54,100 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2018-12-03 16:12:54,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:54,101 INFO L225 Difference]: With dead ends: 1508 [2018-12-03 16:12:54,101 INFO L226 Difference]: Without dead ends: 1367 [2018-12-03 16:12:54,102 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=98, Invalid=174, Unknown=0, NotChecked=0, Total=272 [2018-12-03 16:12:54,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1367 states. [2018-12-03 16:12:54,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1367 to 995. [2018-12-03 16:12:54,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 995 states. [2018-12-03 16:12:54,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 995 states to 995 states and 1571 transitions. [2018-12-03 16:12:54,573 INFO L78 Accepts]: Start accepts. Automaton has 995 states and 1571 transitions. Word has length 18 [2018-12-03 16:12:54,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:54,574 INFO L480 AbstractCegarLoop]: Abstraction has 995 states and 1571 transitions. [2018-12-03 16:12:54,574 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:12:54,574 INFO L276 IsEmpty]: Start isEmpty. Operand 995 states and 1571 transitions. [2018-12-03 16:12:54,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 16:12:54,574 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:54,575 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:12:54,575 INFO L423 AbstractCegarLoop]: === Iteration 51 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:54,575 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:54,575 INFO L82 PathProgramCache]: Analyzing trace with hash -1537299396, now seen corresponding path program 1 times [2018-12-03 16:12:54,575 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:54,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:54,576 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:54,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:54,576 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:54,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:54,643 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:54,643 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:54,643 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:54,643 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-12-03 16:12:54,644 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [29], [32], [38], [41], [56], [57], [58], [61], [65], [67], [70], [72] [2018-12-03 16:12:54,644 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:54,644 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:54,651 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:54,651 INFO L272 AbstractInterpreter]: Visited 15 different actions 29 times. Merged at 9 different actions 10 times. Never widened. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 16:12:54,656 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:54,656 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:54,656 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:54,656 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 16:12:54,665 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:54,665 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:54,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:54,672 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:54,752 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:54,753 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:54,859 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:54,879 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:54,879 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 17 [2018-12-03 16:12:54,879 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:54,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 16:12:54,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 16:12:54,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2018-12-03 16:12:54,880 INFO L87 Difference]: Start difference. First operand 995 states and 1571 transitions. Second operand 12 states. [2018-12-03 16:12:56,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:12:56,466 INFO L93 Difference]: Finished difference Result 1143 states and 1783 transitions. [2018-12-03 16:12:56,466 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 16:12:56,467 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 18 [2018-12-03 16:12:56,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:12:56,468 INFO L225 Difference]: With dead ends: 1143 [2018-12-03 16:12:56,468 INFO L226 Difference]: Without dead ends: 1141 [2018-12-03 16:12:56,469 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=292, Invalid=1190, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 16:12:56,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1141 states. [2018-12-03 16:12:56,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1141 to 970. [2018-12-03 16:12:56,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 970 states. [2018-12-03 16:12:56,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 970 states to 970 states and 1528 transitions. [2018-12-03 16:12:56,783 INFO L78 Accepts]: Start accepts. Automaton has 970 states and 1528 transitions. Word has length 18 [2018-12-03 16:12:56,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:12:56,783 INFO L480 AbstractCegarLoop]: Abstraction has 970 states and 1528 transitions. [2018-12-03 16:12:56,784 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 16:12:56,784 INFO L276 IsEmpty]: Start isEmpty. Operand 970 states and 1528 transitions. [2018-12-03 16:12:56,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 16:12:56,785 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:12:56,786 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2018-12-03 16:12:56,786 INFO L423 AbstractCegarLoop]: === Iteration 52 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:12:56,786 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:56,787 INFO L82 PathProgramCache]: Analyzing trace with hash -1152261854, now seen corresponding path program 1 times [2018-12-03 16:12:56,787 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:12:56,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:56,788 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:56,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:12:56,788 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:12:56,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:56,910 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:56,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:56,911 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:12:56,911 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 21 with the following transitions: [2018-12-03 16:12:56,911 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [21], [29], [32], [65], [67], [72] [2018-12-03 16:12:56,912 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:12:56,912 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:12:56,916 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:12:56,916 INFO L272 AbstractInterpreter]: Visited 10 different actions 15 times. Merged at 5 different actions 5 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:12:56,918 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:12:56,919 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:12:56,919 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:12:56,919 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 16:12:56,927 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:12:56,927 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:12:56,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:12:56,936 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:12:57,006 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:57,007 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:12:57,069 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:12:57,087 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:12:57,087 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7, 7] total 21 [2018-12-03 16:12:57,087 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:12:57,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 16:12:57,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 16:12:57,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2018-12-03 16:12:57,088 INFO L87 Difference]: Start difference. First operand 970 states and 1528 transitions. Second operand 17 states. [2018-12-03 16:12:58,201 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 17 [2018-12-03 16:13:00,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:00,866 INFO L93 Difference]: Finished difference Result 1983 states and 3119 transitions. [2018-12-03 16:13:00,867 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-12-03 16:13:00,867 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 20 [2018-12-03 16:13:00,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:00,869 INFO L225 Difference]: With dead ends: 1983 [2018-12-03 16:13:00,869 INFO L226 Difference]: Without dead ends: 1934 [2018-12-03 16:13:00,870 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 27 SyntacticMatches, 3 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2143 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1636, Invalid=5006, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 16:13:00,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1934 states. [2018-12-03 16:13:01,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1934 to 1027. [2018-12-03 16:13:01,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1027 states. [2018-12-03 16:13:01,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1027 states to 1027 states and 1652 transitions. [2018-12-03 16:13:01,278 INFO L78 Accepts]: Start accepts. Automaton has 1027 states and 1652 transitions. Word has length 20 [2018-12-03 16:13:01,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:01,279 INFO L480 AbstractCegarLoop]: Abstraction has 1027 states and 1652 transitions. [2018-12-03 16:13:01,279 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 16:13:01,279 INFO L276 IsEmpty]: Start isEmpty. Operand 1027 states and 1652 transitions. [2018-12-03 16:13:01,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 16:13:01,280 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:01,280 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 16:13:01,280 INFO L423 AbstractCegarLoop]: === Iteration 53 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:01,281 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:01,281 INFO L82 PathProgramCache]: Analyzing trace with hash -79326665, now seen corresponding path program 1 times [2018-12-03 16:13:01,281 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:01,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:01,281 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:01,282 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:01,282 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:01,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:01,421 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:13:01,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:01,422 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:01,422 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 21 with the following transitions: [2018-12-03 16:13:01,422 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [58], [61], [63], [65], [66] [2018-12-03 16:13:01,423 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:13:01,423 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:13:01,427 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:13:01,427 INFO L272 AbstractInterpreter]: Visited 11 different actions 16 times. Merged at 5 different actions 5 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 16:13:01,437 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:01,437 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:13:01,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:01,437 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 16:13:01,445 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:01,445 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:13:01,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:01,455 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:01,458 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:13:01,459 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:01,501 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:13:01,519 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:01,519 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2018-12-03 16:13:01,519 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:01,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:13:01,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:13:01,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2018-12-03 16:13:01,520 INFO L87 Difference]: Start difference. First operand 1027 states and 1652 transitions. Second operand 7 states. [2018-12-03 16:13:02,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:02,122 INFO L93 Difference]: Finished difference Result 1482 states and 2324 transitions. [2018-12-03 16:13:02,123 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 16:13:02,123 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2018-12-03 16:13:02,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:02,124 INFO L225 Difference]: With dead ends: 1482 [2018-12-03 16:13:02,124 INFO L226 Difference]: Without dead ends: 1262 [2018-12-03 16:13:02,125 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2018-12-03 16:13:02,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1262 states. [2018-12-03 16:13:02,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1262 to 913. [2018-12-03 16:13:02,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 913 states. [2018-12-03 16:13:02,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 913 states to 913 states and 1474 transitions. [2018-12-03 16:13:02,416 INFO L78 Accepts]: Start accepts. Automaton has 913 states and 1474 transitions. Word has length 20 [2018-12-03 16:13:02,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:02,416 INFO L480 AbstractCegarLoop]: Abstraction has 913 states and 1474 transitions. [2018-12-03 16:13:02,416 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:13:02,416 INFO L276 IsEmpty]: Start isEmpty. Operand 913 states and 1474 transitions. [2018-12-03 16:13:02,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 16:13:02,417 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:02,417 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2018-12-03 16:13:02,417 INFO L423 AbstractCegarLoop]: === Iteration 54 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:02,418 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:02,418 INFO L82 PathProgramCache]: Analyzing trace with hash -79325383, now seen corresponding path program 1 times [2018-12-03 16:13:02,418 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:02,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:02,419 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:02,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:02,419 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:02,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:02,525 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:02,525 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:02,525 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:02,525 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 21 with the following transitions: [2018-12-03 16:13:02,525 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [45], [46], [56], [58], [63] [2018-12-03 16:13:02,526 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:13:02,526 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:13:02,532 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:13:02,532 INFO L272 AbstractInterpreter]: Visited 10 different actions 15 times. Merged at 5 different actions 5 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:13:02,569 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:02,569 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:13:02,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:02,570 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 16:13:02,586 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:02,586 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:13:02,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:02,607 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:03,362 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:03,363 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:03,859 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:03,880 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:03,880 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 17 [2018-12-03 16:13:03,880 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:03,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 16:13:03,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 16:13:03,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2018-12-03 16:13:03,881 INFO L87 Difference]: Start difference. First operand 913 states and 1474 transitions. Second operand 13 states. [2018-12-03 16:13:06,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:06,035 INFO L93 Difference]: Finished difference Result 1667 states and 2658 transitions. [2018-12-03 16:13:06,035 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 16:13:06,036 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2018-12-03 16:13:06,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:06,037 INFO L225 Difference]: With dead ends: 1667 [2018-12-03 16:13:06,037 INFO L226 Difference]: Without dead ends: 1518 [2018-12-03 16:13:06,038 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 27 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=505, Invalid=1475, Unknown=0, NotChecked=0, Total=1980 [2018-12-03 16:13:06,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1518 states. [2018-12-03 16:13:06,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1518 to 914. [2018-12-03 16:13:06,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 914 states. [2018-12-03 16:13:06,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 914 states to 914 states and 1478 transitions. [2018-12-03 16:13:06,314 INFO L78 Accepts]: Start accepts. Automaton has 914 states and 1478 transitions. Word has length 20 [2018-12-03 16:13:06,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:06,314 INFO L480 AbstractCegarLoop]: Abstraction has 914 states and 1478 transitions. [2018-12-03 16:13:06,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 16:13:06,314 INFO L276 IsEmpty]: Start isEmpty. Operand 914 states and 1478 transitions. [2018-12-03 16:13:06,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:13:06,314 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:06,315 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 16:13:06,315 INFO L423 AbstractCegarLoop]: === Iteration 55 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:06,315 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:06,315 INFO L82 PathProgramCache]: Analyzing trace with hash 1614386347, now seen corresponding path program 1 times [2018-12-03 16:13:06,315 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:06,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:06,316 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:06,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:06,316 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:06,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:06,447 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:13:06,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:06,448 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:06,448 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 16:13:06,448 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [25], [29], [32], [65], [66], [67], [70], [72] [2018-12-03 16:13:06,449 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:13:06,449 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:13:06,460 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:13:06,460 INFO L272 AbstractInterpreter]: Visited 13 different actions 31 times. Merged at 10 different actions 14 times. Widened at 1 different actions 1 times. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 16:13:06,500 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:06,500 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:13:06,500 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:06,500 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 16:13:06,516 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:06,516 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:13:06,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:06,537 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:07,275 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:07,276 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:07,372 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:07,391 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:07,391 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 9] total 24 [2018-12-03 16:13:07,391 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:07,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 16:13:07,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 16:13:07,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2018-12-03 16:13:07,392 INFO L87 Difference]: Start difference. First operand 914 states and 1478 transitions. Second operand 20 states. [2018-12-03 16:13:11,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:11,161 INFO L93 Difference]: Finished difference Result 2449 states and 3945 transitions. [2018-12-03 16:13:11,162 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-12-03 16:13:11,162 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 21 [2018-12-03 16:13:11,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:11,163 INFO L225 Difference]: With dead ends: 2449 [2018-12-03 16:13:11,163 INFO L226 Difference]: Without dead ends: 1536 [2018-12-03 16:13:11,165 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2713 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1425, Invalid=7317, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 16:13:11,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1536 states. [2018-12-03 16:13:11,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1536 to 1258. [2018-12-03 16:13:11,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1258 states. [2018-12-03 16:13:11,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1258 states to 1258 states and 2050 transitions. [2018-12-03 16:13:11,542 INFO L78 Accepts]: Start accepts. Automaton has 1258 states and 2050 transitions. Word has length 21 [2018-12-03 16:13:11,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:11,542 INFO L480 AbstractCegarLoop]: Abstraction has 1258 states and 2050 transitions. [2018-12-03 16:13:11,542 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 16:13:11,542 INFO L276 IsEmpty]: Start isEmpty. Operand 1258 states and 2050 transitions. [2018-12-03 16:13:11,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:13:11,543 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:11,543 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:13:11,543 INFO L423 AbstractCegarLoop]: === Iteration 56 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:11,544 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:11,544 INFO L82 PathProgramCache]: Analyzing trace with hash 1615679213, now seen corresponding path program 1 times [2018-12-03 16:13:11,544 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:11,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:11,544 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:11,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:11,544 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:11,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:11,638 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:11,638 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:11,638 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:11,638 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 16:13:11,638 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [25], [27], [29], [32], [45], [46], [65], [67], [70], [72] [2018-12-03 16:13:11,639 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:13:11,639 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:13:11,654 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:13:11,654 INFO L272 AbstractInterpreter]: Visited 17 different actions 46 times. Merged at 15 different actions 23 times. Widened at 1 different actions 1 times. Found 10 fixpoints after 6 different actions. Largest state had 0 variables. [2018-12-03 16:13:11,667 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:11,667 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:13:11,667 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:11,667 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 16:13:11,675 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:11,675 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:13:11,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:11,684 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:11,908 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:11,909 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:12,120 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:12,140 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:12,140 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 25 [2018-12-03 16:13:12,140 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:12,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 16:13:12,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 16:13:12,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:13:12,141 INFO L87 Difference]: Start difference. First operand 1258 states and 2050 transitions. Second operand 18 states. [2018-12-03 16:13:16,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:16,040 INFO L93 Difference]: Finished difference Result 2217 states and 3616 transitions. [2018-12-03 16:13:16,040 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-12-03 16:13:16,040 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 21 [2018-12-03 16:13:16,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:16,042 INFO L225 Difference]: With dead ends: 2217 [2018-12-03 16:13:16,042 INFO L226 Difference]: Without dead ends: 2215 [2018-12-03 16:13:16,043 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1803 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1092, Invalid=5388, Unknown=0, NotChecked=0, Total=6480 [2018-12-03 16:13:16,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2215 states. [2018-12-03 16:13:16,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2215 to 1626. [2018-12-03 16:13:16,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1626 states. [2018-12-03 16:13:16,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1626 states to 1626 states and 2667 transitions. [2018-12-03 16:13:16,554 INFO L78 Accepts]: Start accepts. Automaton has 1626 states and 2667 transitions. Word has length 21 [2018-12-03 16:13:16,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:16,554 INFO L480 AbstractCegarLoop]: Abstraction has 1626 states and 2667 transitions. [2018-12-03 16:13:16,554 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 16:13:16,554 INFO L276 IsEmpty]: Start isEmpty. Operand 1626 states and 2667 transitions. [2018-12-03 16:13:16,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:13:16,555 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:16,555 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:13:16,555 INFO L423 AbstractCegarLoop]: === Iteration 57 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:16,555 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:16,555 INFO L82 PathProgramCache]: Analyzing trace with hash 1336385522, now seen corresponding path program 1 times [2018-12-03 16:13:16,555 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:16,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:16,556 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:16,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:16,556 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:16,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:16,657 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:16,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:16,657 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:16,657 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 16:13:16,658 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [25], [29], [32], [56], [57], [65], [67], [70], [72] [2018-12-03 16:13:16,658 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:13:16,658 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:13:16,669 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:13:16,669 INFO L272 AbstractInterpreter]: Visited 14 different actions 35 times. Merged at 11 different actions 15 times. Widened at 1 different actions 1 times. Found 9 fixpoints after 5 different actions. Largest state had 0 variables. [2018-12-03 16:13:16,705 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:16,705 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:13:16,705 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:16,705 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 16:13:16,722 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:16,722 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:13:16,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:16,744 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:18,413 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:18,414 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:18,634 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:18,653 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:18,653 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 23 [2018-12-03 16:13:18,653 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:18,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 16:13:18,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 16:13:18,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=478, Unknown=0, NotChecked=0, Total=552 [2018-12-03 16:13:18,654 INFO L87 Difference]: Start difference. First operand 1626 states and 2667 transitions. Second operand 16 states. [2018-12-03 16:13:22,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:22,252 INFO L93 Difference]: Finished difference Result 2236 states and 3644 transitions. [2018-12-03 16:13:22,253 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 16:13:22,253 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 21 [2018-12-03 16:13:22,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:22,255 INFO L225 Difference]: With dead ends: 2236 [2018-12-03 16:13:22,255 INFO L226 Difference]: Without dead ends: 2234 [2018-12-03 16:13:22,256 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 963 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=900, Invalid=3390, Unknown=0, NotChecked=0, Total=4290 [2018-12-03 16:13:22,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2234 states. [2018-12-03 16:13:22,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2234 to 1542. [2018-12-03 16:13:22,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1542 states. [2018-12-03 16:13:22,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1542 states to 1542 states and 2522 transitions. [2018-12-03 16:13:22,764 INFO L78 Accepts]: Start accepts. Automaton has 1542 states and 2522 transitions. Word has length 21 [2018-12-03 16:13:22,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:22,765 INFO L480 AbstractCegarLoop]: Abstraction has 1542 states and 2522 transitions. [2018-12-03 16:13:22,765 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 16:13:22,765 INFO L276 IsEmpty]: Start isEmpty. Operand 1542 states and 2522 transitions. [2018-12-03 16:13:22,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:13:22,766 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:22,766 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:13:22,766 INFO L423 AbstractCegarLoop]: === Iteration 58 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:22,766 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:22,766 INFO L82 PathProgramCache]: Analyzing trace with hash 1327798635, now seen corresponding path program 1 times [2018-12-03 16:13:22,766 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:22,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:22,767 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:22,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:22,767 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:22,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:22,903 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:22,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:22,904 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:22,904 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 16:13:22,904 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [25], [29], [32], [45], [46], [56], [58], [63], [65], [67], [70], [72] [2018-12-03 16:13:22,905 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:13:22,905 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:13:22,916 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:13:22,917 INFO L272 AbstractInterpreter]: Visited 17 different actions 40 times. Merged at 12 different actions 16 times. Widened at 1 different actions 1 times. Found 10 fixpoints after 6 different actions. Largest state had 0 variables. [2018-12-03 16:13:22,954 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:22,954 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:13:22,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:22,954 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 16:13:22,969 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:22,969 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:13:22,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:22,976 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:23,094 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:23,094 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:23,224 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:23,244 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:23,245 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 24 [2018-12-03 16:13:23,245 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:23,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 16:13:23,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 16:13:23,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=522, Unknown=0, NotChecked=0, Total=600 [2018-12-03 16:13:23,246 INFO L87 Difference]: Start difference. First operand 1542 states and 2522 transitions. Second operand 17 states. [2018-12-03 16:13:27,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:27,033 INFO L93 Difference]: Finished difference Result 2137 states and 3466 transitions. [2018-12-03 16:13:27,033 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-12-03 16:13:27,034 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 21 [2018-12-03 16:13:27,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:27,036 INFO L225 Difference]: With dead ends: 2137 [2018-12-03 16:13:27,036 INFO L226 Difference]: Without dead ends: 2135 [2018-12-03 16:13:27,037 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1158 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=870, Invalid=3960, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 16:13:27,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2135 states. [2018-12-03 16:13:27,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2135 to 1667. [2018-12-03 16:13:27,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1667 states. [2018-12-03 16:13:27,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1667 states to 1667 states and 2719 transitions. [2018-12-03 16:13:27,597 INFO L78 Accepts]: Start accepts. Automaton has 1667 states and 2719 transitions. Word has length 21 [2018-12-03 16:13:27,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:27,597 INFO L480 AbstractCegarLoop]: Abstraction has 1667 states and 2719 transitions. [2018-12-03 16:13:27,597 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 16:13:27,597 INFO L276 IsEmpty]: Start isEmpty. Operand 1667 states and 2719 transitions. [2018-12-03 16:13:27,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:13:27,598 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:27,599 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:13:27,599 INFO L423 AbstractCegarLoop]: === Iteration 59 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:27,599 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:27,599 INFO L82 PathProgramCache]: Analyzing trace with hash 1958649716, now seen corresponding path program 1 times [2018-12-03 16:13:27,599 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:27,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:27,600 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:27,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:27,600 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:27,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:27,708 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:27,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:27,709 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:27,709 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 16:13:27,709 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [56], [57], [58], [61], [65], [67], [70], [72] [2018-12-03 16:13:27,709 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:13:27,709 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:13:27,717 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:13:27,717 INFO L272 AbstractInterpreter]: Visited 13 different actions 29 times. Merged at 9 different actions 12 times. Never widened. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 16:13:27,736 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:27,736 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:13:27,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:27,736 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 16:13:27,746 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:27,746 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:13:27,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:27,752 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:27,876 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:27,877 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:28,003 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:28,024 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:28,024 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 24 [2018-12-03 16:13:28,024 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:28,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 16:13:28,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 16:13:28,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=528, Unknown=0, NotChecked=0, Total=600 [2018-12-03 16:13:28,025 INFO L87 Difference]: Start difference. First operand 1667 states and 2719 transitions. Second operand 17 states. [2018-12-03 16:13:32,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:32,968 INFO L93 Difference]: Finished difference Result 2404 states and 3875 transitions. [2018-12-03 16:13:32,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 16:13:32,968 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 21 [2018-12-03 16:13:32,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:32,971 INFO L225 Difference]: With dead ends: 2404 [2018-12-03 16:13:32,971 INFO L226 Difference]: Without dead ends: 2402 [2018-12-03 16:13:32,972 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1866 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1453, Invalid=5687, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 16:13:32,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2402 states. [2018-12-03 16:13:33,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2402 to 1292. [2018-12-03 16:13:33,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1292 states. [2018-12-03 16:13:33,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1292 states to 1292 states and 2076 transitions. [2018-12-03 16:13:33,461 INFO L78 Accepts]: Start accepts. Automaton has 1292 states and 2076 transitions. Word has length 21 [2018-12-03 16:13:33,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:33,461 INFO L480 AbstractCegarLoop]: Abstraction has 1292 states and 2076 transitions. [2018-12-03 16:13:33,461 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 16:13:33,461 INFO L276 IsEmpty]: Start isEmpty. Operand 1292 states and 2076 transitions. [2018-12-03 16:13:33,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:13:33,462 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:33,462 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:13:33,462 INFO L423 AbstractCegarLoop]: === Iteration 60 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:33,462 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:33,462 INFO L82 PathProgramCache]: Analyzing trace with hash 1950062829, now seen corresponding path program 1 times [2018-12-03 16:13:33,462 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:33,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:33,463 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:33,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:33,463 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:33,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:33,899 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:33,899 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:33,899 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:33,900 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 16:13:33,900 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [45], [46], [56], [58], [61], [63], [65], [67], [70], [72] [2018-12-03 16:13:33,900 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:13:33,900 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:13:33,908 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:13:33,908 INFO L272 AbstractInterpreter]: Visited 15 different actions 32 times. Merged at 9 different actions 12 times. Never widened. Found 8 fixpoints after 5 different actions. Largest state had 0 variables. [2018-12-03 16:13:33,942 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:33,942 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:13:33,942 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:33,943 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 16:13:33,959 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:33,959 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:13:33,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:33,981 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:34,114 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:34,115 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:34,240 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:34,260 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:34,260 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9] total 26 [2018-12-03 16:13:34,260 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:34,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 16:13:34,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 16:13:34,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=619, Unknown=0, NotChecked=0, Total=702 [2018-12-03 16:13:34,261 INFO L87 Difference]: Start difference. First operand 1292 states and 2076 transitions. Second operand 19 states. [2018-12-03 16:13:39,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:39,874 INFO L93 Difference]: Finished difference Result 1933 states and 3058 transitions. [2018-12-03 16:13:39,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2018-12-03 16:13:39,874 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 21 [2018-12-03 16:13:39,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:39,876 INFO L225 Difference]: With dead ends: 1933 [2018-12-03 16:13:39,876 INFO L226 Difference]: Without dead ends: 1931 [2018-12-03 16:13:39,877 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2593 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1637, Invalid=7483, Unknown=0, NotChecked=0, Total=9120 [2018-12-03 16:13:39,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1931 states. [2018-12-03 16:13:40,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1931 to 1222. [2018-12-03 16:13:40,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1222 states. [2018-12-03 16:13:40,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1222 states to 1222 states and 1955 transitions. [2018-12-03 16:13:40,353 INFO L78 Accepts]: Start accepts. Automaton has 1222 states and 1955 transitions. Word has length 21 [2018-12-03 16:13:40,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:40,353 INFO L480 AbstractCegarLoop]: Abstraction has 1222 states and 1955 transitions. [2018-12-03 16:13:40,353 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 16:13:40,353 INFO L276 IsEmpty]: Start isEmpty. Operand 1222 states and 1955 transitions. [2018-12-03 16:13:40,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:13:40,354 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:40,354 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:13:40,354 INFO L423 AbstractCegarLoop]: === Iteration 61 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:40,354 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:40,355 INFO L82 PathProgramCache]: Analyzing trace with hash 1109912645, now seen corresponding path program 1 times [2018-12-03 16:13:40,355 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:40,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:40,355 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:40,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:40,355 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:40,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:40,481 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:40,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:40,481 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:40,481 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 16:13:40,481 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [27], [29], [32], [45], [46], [56], [58], [61], [65], [67], [70], [72] [2018-12-03 16:13:40,482 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:13:40,482 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:13:40,497 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:13:40,497 INFO L272 AbstractInterpreter]: Visited 19 different actions 52 times. Merged at 17 different actions 25 times. Widened at 1 different actions 1 times. Found 12 fixpoints after 7 different actions. Largest state had 0 variables. [2018-12-03 16:13:40,514 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:40,514 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:13:40,514 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:40,514 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 16:13:40,522 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:40,522 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:13:40,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:40,530 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:40,851 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:13:40,851 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:40,951 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:13:40,969 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:40,969 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 23 [2018-12-03 16:13:40,969 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:40,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 16:13:40,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 16:13:40,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=481, Unknown=0, NotChecked=0, Total=552 [2018-12-03 16:13:40,970 INFO L87 Difference]: Start difference. First operand 1222 states and 1955 transitions. Second operand 17 states. [2018-12-03 16:13:44,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:44,210 INFO L93 Difference]: Finished difference Result 1702 states and 2693 transitions. [2018-12-03 16:13:44,210 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 16:13:44,210 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 21 [2018-12-03 16:13:44,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:44,212 INFO L225 Difference]: With dead ends: 1702 [2018-12-03 16:13:44,212 INFO L226 Difference]: Without dead ends: 1700 [2018-12-03 16:13:44,213 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1340 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=765, Invalid=4347, Unknown=0, NotChecked=0, Total=5112 [2018-12-03 16:13:44,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1700 states. [2018-12-03 16:13:44,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1700 to 1303. [2018-12-03 16:13:44,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1303 states. [2018-12-03 16:13:44,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1303 states to 1303 states and 2069 transitions. [2018-12-03 16:13:44,771 INFO L78 Accepts]: Start accepts. Automaton has 1303 states and 2069 transitions. Word has length 21 [2018-12-03 16:13:44,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:44,771 INFO L480 AbstractCegarLoop]: Abstraction has 1303 states and 2069 transitions. [2018-12-03 16:13:44,771 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 16:13:44,771 INFO L276 IsEmpty]: Start isEmpty. Operand 1303 states and 2069 transitions. [2018-12-03 16:13:44,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:13:44,772 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:44,772 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:13:44,772 INFO L423 AbstractCegarLoop]: === Iteration 62 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:44,772 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:44,772 INFO L82 PathProgramCache]: Analyzing trace with hash 830619242, now seen corresponding path program 1 times [2018-12-03 16:13:44,772 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:44,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:44,773 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:44,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:44,773 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:44,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:45,348 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:45,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:45,348 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:45,348 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 16:13:45,348 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [56], [58], [61], [65], [66], [67], [70], [72] [2018-12-03 16:13:45,349 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:13:45,349 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:13:45,355 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:13:45,355 INFO L272 AbstractInterpreter]: Visited 13 different actions 29 times. Merged at 9 different actions 12 times. Never widened. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 16:13:45,356 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:45,356 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:13:45,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:45,357 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 16:13:45,369 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:45,369 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:13:45,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:45,377 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:45,444 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:13:45,445 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:45,589 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:13:45,607 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:45,608 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 9] total 24 [2018-12-03 16:13:45,608 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:45,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 16:13:45,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 16:13:45,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2018-12-03 16:13:45,609 INFO L87 Difference]: Start difference. First operand 1303 states and 2069 transitions. Second operand 17 states. [2018-12-03 16:13:47,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:13:47,223 INFO L93 Difference]: Finished difference Result 1390 states and 2195 transitions. [2018-12-03 16:13:47,223 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-03 16:13:47,223 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 21 [2018-12-03 16:13:47,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:13:47,225 INFO L225 Difference]: With dead ends: 1390 [2018-12-03 16:13:47,225 INFO L226 Difference]: Without dead ends: 1389 [2018-12-03 16:13:47,225 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=330, Invalid=1392, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 16:13:47,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1389 states. [2018-12-03 16:13:47,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1389 to 1267. [2018-12-03 16:13:47,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1267 states. [2018-12-03 16:13:47,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1267 states to 1267 states and 2003 transitions. [2018-12-03 16:13:47,751 INFO L78 Accepts]: Start accepts. Automaton has 1267 states and 2003 transitions. Word has length 21 [2018-12-03 16:13:47,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:13:47,751 INFO L480 AbstractCegarLoop]: Abstraction has 1267 states and 2003 transitions. [2018-12-03 16:13:47,751 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 16:13:47,751 INFO L276 IsEmpty]: Start isEmpty. Operand 1267 states and 2003 transitions. [2018-12-03 16:13:47,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:13:47,751 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:13:47,752 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:13:47,752 INFO L423 AbstractCegarLoop]: === Iteration 63 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:13:47,752 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:13:47,752 INFO L82 PathProgramCache]: Analyzing trace with hash 830618954, now seen corresponding path program 2 times [2018-12-03 16:13:47,752 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:13:47,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:47,753 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:13:47,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:13:47,753 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:13:47,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:13:47,931 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:13:47,932 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:47,932 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:13:47,932 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:13:47,932 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:13:47,932 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:13:47,932 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 16:13:47,944 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:13:47,944 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:13:47,952 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-03 16:13:47,952 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:13:47,953 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:13:48,488 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:13:48,489 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:13:48,655 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:13:48,679 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:13:48,679 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 25 [2018-12-03 16:13:48,679 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:13:48,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 16:13:48,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 16:13:48,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=559, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:13:48,680 INFO L87 Difference]: Start difference. First operand 1267 states and 2003 transitions. Second operand 18 states. [2018-12-03 16:13:51,550 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 27 [2018-12-03 16:13:52,777 WARN L180 SmtUtils]: Spent 519.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 23 [2018-12-03 16:13:52,995 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 27 [2018-12-03 16:13:54,083 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2018-12-03 16:13:54,587 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 28 [2018-12-03 16:13:55,199 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 24 [2018-12-03 16:13:55,468 WARN L180 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2018-12-03 16:13:56,225 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 28 [2018-12-03 16:13:56,623 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2018-12-03 16:13:57,185 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 27 [2018-12-03 16:13:58,200 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2018-12-03 16:13:58,577 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 27 [2018-12-03 16:13:59,638 WARN L180 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 26 [2018-12-03 16:14:03,066 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2018-12-03 16:14:03,458 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 23 [2018-12-03 16:14:04,626 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 28 [2018-12-03 16:14:05,082 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 28 [2018-12-03 16:14:06,576 WARN L180 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2018-12-03 16:14:08,796 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 31 [2018-12-03 16:14:08,929 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 29 [2018-12-03 16:14:09,306 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2018-12-03 16:14:11,758 WARN L180 SmtUtils]: Spent 338.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 31 [2018-12-03 16:14:13,071 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2018-12-03 16:14:13,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:14:13,812 INFO L93 Difference]: Finished difference Result 3209 states and 5032 transitions. [2018-12-03 16:14:13,812 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2018-12-03 16:14:13,813 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 21 [2018-12-03 16:14:13,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:14:13,815 INFO L225 Difference]: With dead ends: 3209 [2018-12-03 16:14:13,815 INFO L226 Difference]: Without dead ends: 3207 [2018-12-03 16:14:13,816 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10226 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=4184, Invalid=23871, Unknown=1, NotChecked=0, Total=28056 [2018-12-03 16:14:13,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3207 states. [2018-12-03 16:14:14,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3207 to 1194. [2018-12-03 16:14:14,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1194 states. [2018-12-03 16:14:14,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1194 states to 1194 states and 1882 transitions. [2018-12-03 16:14:14,338 INFO L78 Accepts]: Start accepts. Automaton has 1194 states and 1882 transitions. Word has length 21 [2018-12-03 16:14:14,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:14:14,339 INFO L480 AbstractCegarLoop]: Abstraction has 1194 states and 1882 transitions. [2018-12-03 16:14:14,339 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 16:14:14,339 INFO L276 IsEmpty]: Start isEmpty. Operand 1194 states and 1882 transitions. [2018-12-03 16:14:14,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:14:14,339 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:14:14,340 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 16:14:14,340 INFO L423 AbstractCegarLoop]: === Iteration 64 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:14:14,340 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:14,340 INFO L82 PathProgramCache]: Analyzing trace with hash 1780993451, now seen corresponding path program 1 times [2018-12-03 16:14:14,340 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:14:14,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:14,341 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:14:14,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:14,341 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:14:14,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:14,546 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:14:14,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:14,547 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:14:14,547 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 16:14:14,547 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [57], [58], [61], [63], [65], [67], [70] [2018-12-03 16:14:14,548 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:14:14,548 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:14:14,556 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:14:14,556 INFO L272 AbstractInterpreter]: Visited 13 different actions 29 times. Merged at 9 different actions 12 times. Never widened. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 16:14:14,579 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:14,580 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:14:14,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:14,580 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 16:14:14,589 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:14:14,589 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:14:14,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:14,597 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:14:14,699 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:14,700 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:14:15,282 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 13 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:15,300 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:14:15,300 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 22 [2018-12-03 16:14:15,300 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:14:15,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 16:14:15,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 16:14:15,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=399, Unknown=1, NotChecked=0, Total=462 [2018-12-03 16:14:15,301 INFO L87 Difference]: Start difference. First operand 1194 states and 1882 transitions. Second operand 18 states. [2018-12-03 16:14:16,605 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2018-12-03 16:14:18,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:14:18,183 INFO L93 Difference]: Finished difference Result 3260 states and 5085 transitions. [2018-12-03 16:14:18,184 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-12-03 16:14:18,184 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 21 [2018-12-03 16:14:18,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:14:18,186 INFO L225 Difference]: With dead ends: 3260 [2018-12-03 16:14:18,186 INFO L226 Difference]: Without dead ends: 1995 [2018-12-03 16:14:18,187 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 27 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=392, Invalid=1959, Unknown=1, NotChecked=0, Total=2352 [2018-12-03 16:14:18,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1995 states. [2018-12-03 16:14:18,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1995 to 1674. [2018-12-03 16:14:18,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1674 states. [2018-12-03 16:14:18,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1674 states to 1674 states and 2594 transitions. [2018-12-03 16:14:18,935 INFO L78 Accepts]: Start accepts. Automaton has 1674 states and 2594 transitions. Word has length 21 [2018-12-03 16:14:18,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:14:18,935 INFO L480 AbstractCegarLoop]: Abstraction has 1674 states and 2594 transitions. [2018-12-03 16:14:18,935 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 16:14:18,935 INFO L276 IsEmpty]: Start isEmpty. Operand 1674 states and 2594 transitions. [2018-12-03 16:14:18,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:14:18,936 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:14:18,936 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:14:18,937 INFO L423 AbstractCegarLoop]: === Iteration 65 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:14:18,937 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:18,937 INFO L82 PathProgramCache]: Analyzing trace with hash 343493869, now seen corresponding path program 1 times [2018-12-03 16:14:18,937 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:14:18,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:18,938 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:14:18,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:18,938 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:14:18,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:19,044 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:19,044 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:19,044 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:14:19,044 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 16:14:19,044 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [25], [27], [38], [41], [65], [67], [70], [72] [2018-12-03 16:14:19,045 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:14:19,045 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:14:19,056 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:14:19,056 INFO L272 AbstractInterpreter]: Visited 16 different actions 41 times. Merged at 14 different actions 21 times. Never widened. Found 8 fixpoints after 5 different actions. Largest state had 0 variables. [2018-12-03 16:14:19,093 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:19,093 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:14:19,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:19,093 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 16:14:19,110 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:14:19,110 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:14:19,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:19,130 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:14:19,311 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:14:19,312 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:14:19,417 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:14:19,436 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:14:19,436 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 21 [2018-12-03 16:14:19,436 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:14:19,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 16:14:19,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 16:14:19,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2018-12-03 16:14:19,437 INFO L87 Difference]: Start difference. First operand 1674 states and 2594 transitions. Second operand 15 states. [2018-12-03 16:14:21,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:14:21,517 INFO L93 Difference]: Finished difference Result 1784 states and 2749 transitions. [2018-12-03 16:14:21,517 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 16:14:21,517 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 21 [2018-12-03 16:14:21,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:14:21,519 INFO L225 Difference]: With dead ends: 1784 [2018-12-03 16:14:21,519 INFO L226 Difference]: Without dead ends: 1782 [2018-12-03 16:14:21,520 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=261, Invalid=1379, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 16:14:21,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1782 states. [2018-12-03 16:14:22,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1782 to 1680. [2018-12-03 16:14:22,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1680 states. [2018-12-03 16:14:22,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1680 states to 1680 states and 2602 transitions. [2018-12-03 16:14:22,269 INFO L78 Accepts]: Start accepts. Automaton has 1680 states and 2602 transitions. Word has length 21 [2018-12-03 16:14:22,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:14:22,269 INFO L480 AbstractCegarLoop]: Abstraction has 1680 states and 2602 transitions. [2018-12-03 16:14:22,269 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 16:14:22,269 INFO L276 IsEmpty]: Start isEmpty. Operand 1680 states and 2602 transitions. [2018-12-03 16:14:22,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:14:22,270 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:14:22,270 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 16:14:22,270 INFO L423 AbstractCegarLoop]: === Iteration 66 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:14:22,270 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:22,270 INFO L82 PathProgramCache]: Analyzing trace with hash -2130898623, now seen corresponding path program 2 times [2018-12-03 16:14:22,270 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:14:22,271 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:22,271 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:14:22,271 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:22,271 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:14:22,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:22,376 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:14:22,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:22,377 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:14:22,377 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:14:22,377 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:14:22,377 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:22,377 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 16:14:22,386 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:14:22,386 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:14:22,393 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-12-03 16:14:22,393 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:14:22,394 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:14:22,501 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-12-03 16:14:22,502 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:14:22,624 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-12-03 16:14:22,643 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:14:22,643 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 26 [2018-12-03 16:14:22,643 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:14:22,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 16:14:22,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 16:14:22,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=610, Unknown=0, NotChecked=0, Total=702 [2018-12-03 16:14:22,644 INFO L87 Difference]: Start difference. First operand 1680 states and 2602 transitions. Second operand 19 states. [2018-12-03 16:14:24,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:14:24,929 INFO L93 Difference]: Finished difference Result 1905 states and 2933 transitions. [2018-12-03 16:14:24,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 16:14:24,929 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 21 [2018-12-03 16:14:24,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:14:24,931 INFO L225 Difference]: With dead ends: 1905 [2018-12-03 16:14:24,931 INFO L226 Difference]: Without dead ends: 1904 [2018-12-03 16:14:24,932 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=442, Invalid=1364, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 16:14:24,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1904 states. [2018-12-03 16:14:25,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1904 to 1686. [2018-12-03 16:14:25,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1686 states. [2018-12-03 16:14:25,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1686 states to 1686 states and 2604 transitions. [2018-12-03 16:14:25,690 INFO L78 Accepts]: Start accepts. Automaton has 1686 states and 2604 transitions. Word has length 21 [2018-12-03 16:14:25,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:14:25,690 INFO L480 AbstractCegarLoop]: Abstraction has 1686 states and 2604 transitions. [2018-12-03 16:14:25,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 16:14:25,691 INFO L276 IsEmpty]: Start isEmpty. Operand 1686 states and 2604 transitions. [2018-12-03 16:14:25,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:14:25,691 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:14:25,691 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:14:25,692 INFO L423 AbstractCegarLoop]: === Iteration 67 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:14:25,692 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:25,692 INFO L82 PathProgramCache]: Analyzing trace with hash -2130897853, now seen corresponding path program 1 times [2018-12-03 16:14:25,692 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:14:25,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:25,692 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:14:25,693 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:25,693 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:14:25,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:25,881 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:25,881 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:25,881 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:14:25,881 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 16:14:25,882 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [21], [38], [41], [56], [58], [61], [63], [65], [67], [70], [72] [2018-12-03 16:14:25,882 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:14:25,882 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:14:25,889 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:14:25,889 INFO L272 AbstractInterpreter]: Visited 15 different actions 32 times. Merged at 9 different actions 12 times. Never widened. Found 8 fixpoints after 5 different actions. Largest state had 0 variables. [2018-12-03 16:14:25,924 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:25,924 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:14:25,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:25,924 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 16:14:25,944 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:14:25,944 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:14:25,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:25,968 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:14:26,038 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:14:26,039 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:14:26,135 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:14:26,154 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:14:26,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 19 [2018-12-03 16:14:26,155 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:14:26,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 16:14:26,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 16:14:26,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:14:26,155 INFO L87 Difference]: Start difference. First operand 1686 states and 2604 transitions. Second operand 13 states. [2018-12-03 16:14:28,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:14:28,128 INFO L93 Difference]: Finished difference Result 1882 states and 2891 transitions. [2018-12-03 16:14:28,128 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 16:14:28,128 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2018-12-03 16:14:28,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:14:28,130 INFO L225 Difference]: With dead ends: 1882 [2018-12-03 16:14:28,130 INFO L226 Difference]: Without dead ends: 1880 [2018-12-03 16:14:28,131 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=190, Invalid=1000, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 16:14:28,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1880 states. [2018-12-03 16:14:28,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1880 to 1728. [2018-12-03 16:14:28,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1728 states. [2018-12-03 16:14:28,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1728 states to 1728 states and 2673 transitions. [2018-12-03 16:14:28,931 INFO L78 Accepts]: Start accepts. Automaton has 1728 states and 2673 transitions. Word has length 21 [2018-12-03 16:14:28,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:14:28,931 INFO L480 AbstractCegarLoop]: Abstraction has 1728 states and 2673 transitions. [2018-12-03 16:14:28,931 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 16:14:28,931 INFO L276 IsEmpty]: Start isEmpty. Operand 1728 states and 2673 transitions. [2018-12-03 16:14:28,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:14:28,932 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:14:28,932 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:14:28,932 INFO L423 AbstractCegarLoop]: === Iteration 68 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:14:28,932 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:28,932 INFO L82 PathProgramCache]: Analyzing trace with hash -2139486792, now seen corresponding path program 1 times [2018-12-03 16:14:28,932 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:14:28,933 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:28,933 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:14:28,933 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:28,933 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:14:28,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:29,059 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:29,060 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:29,060 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:14:29,060 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-12-03 16:14:29,060 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [38], [41], [56], [58], [61], [63], [65], [66], [67], [70] [2018-12-03 16:14:29,061 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:14:29,061 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:14:29,068 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:14:29,068 INFO L272 AbstractInterpreter]: Visited 13 different actions 29 times. Merged at 9 different actions 12 times. Never widened. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 16:14:29,095 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:29,095 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:14:29,095 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:29,095 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 16:14:29,112 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:14:29,112 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:14:29,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:29,134 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:14:29,966 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:14:29,967 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:14:30,060 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:14:30,079 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:14:30,079 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 19 [2018-12-03 16:14:30,079 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:14:30,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 16:14:30,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 16:14:30,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:14:30,080 INFO L87 Difference]: Start difference. First operand 1728 states and 2673 transitions. Second operand 13 states. [2018-12-03 16:14:32,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:14:32,343 INFO L93 Difference]: Finished difference Result 2053 states and 3178 transitions. [2018-12-03 16:14:32,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 16:14:32,343 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2018-12-03 16:14:32,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:14:32,345 INFO L225 Difference]: With dead ends: 2053 [2018-12-03 16:14:32,345 INFO L226 Difference]: Without dead ends: 2051 [2018-12-03 16:14:32,346 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=240, Invalid=1242, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 16:14:32,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2051 states. [2018-12-03 16:14:33,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2051 to 1778. [2018-12-03 16:14:33,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1778 states. [2018-12-03 16:14:33,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1778 states to 1778 states and 2759 transitions. [2018-12-03 16:14:33,140 INFO L78 Accepts]: Start accepts. Automaton has 1778 states and 2759 transitions. Word has length 21 [2018-12-03 16:14:33,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:14:33,140 INFO L480 AbstractCegarLoop]: Abstraction has 1778 states and 2759 transitions. [2018-12-03 16:14:33,140 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 16:14:33,140 INFO L276 IsEmpty]: Start isEmpty. Operand 1778 states and 2759 transitions. [2018-12-03 16:14:33,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:14:33,141 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:14:33,141 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:14:33,141 INFO L423 AbstractCegarLoop]: === Iteration 69 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:14:33,141 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:33,141 INFO L82 PathProgramCache]: Analyzing trace with hash 1555740810, now seen corresponding path program 3 times [2018-12-03 16:14:33,142 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:14:33,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:33,142 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:14:33,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:33,143 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:14:33,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:33,243 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:33,243 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:33,243 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:14:33,243 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:14:33,244 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:14:33,244 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:33,244 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 16:14:33,254 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:14:33,254 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:14:33,261 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:14:33,262 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:14:33,263 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:14:33,528 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:33,528 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:14:33,923 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:33,943 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:14:33,943 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 23 [2018-12-03 16:14:33,943 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:14:33,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 16:14:33,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 16:14:33,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=484, Unknown=0, NotChecked=0, Total=552 [2018-12-03 16:14:33,944 INFO L87 Difference]: Start difference. First operand 1778 states and 2759 transitions. Second operand 16 states. [2018-12-03 16:14:38,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:14:38,450 INFO L93 Difference]: Finished difference Result 2603 states and 4090 transitions. [2018-12-03 16:14:38,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-03 16:14:38,451 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 21 [2018-12-03 16:14:38,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:14:38,453 INFO L225 Difference]: With dead ends: 2603 [2018-12-03 16:14:38,454 INFO L226 Difference]: Without dead ends: 2601 [2018-12-03 16:14:38,455 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1128 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=678, Invalid=4292, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 16:14:38,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2601 states. [2018-12-03 16:14:39,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2601 to 2145. [2018-12-03 16:14:39,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2145 states. [2018-12-03 16:14:39,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2145 states to 2145 states and 3390 transitions. [2018-12-03 16:14:39,402 INFO L78 Accepts]: Start accepts. Automaton has 2145 states and 3390 transitions. Word has length 21 [2018-12-03 16:14:39,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:14:39,402 INFO L480 AbstractCegarLoop]: Abstraction has 2145 states and 3390 transitions. [2018-12-03 16:14:39,402 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 16:14:39,402 INFO L276 IsEmpty]: Start isEmpty. Operand 2145 states and 3390 transitions. [2018-12-03 16:14:39,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:14:39,403 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:14:39,403 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:14:39,403 INFO L423 AbstractCegarLoop]: === Iteration 70 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:14:39,403 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:39,403 INFO L82 PathProgramCache]: Analyzing trace with hash -1665064723, now seen corresponding path program 2 times [2018-12-03 16:14:39,403 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:14:39,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:39,404 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:14:39,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:39,404 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:14:39,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:39,518 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:39,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:39,518 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:14:39,519 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:14:39,519 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:14:39,519 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:39,519 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 16:14:39,528 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:14:39,528 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:14:39,535 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-12-03 16:14:39,535 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:14:39,536 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:14:39,691 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:14:39,691 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:14:39,780 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:14:39,799 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:14:39,799 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 22 [2018-12-03 16:14:39,799 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:14:39,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 16:14:39,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 16:14:39,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2018-12-03 16:14:39,800 INFO L87 Difference]: Start difference. First operand 2145 states and 3390 transitions. Second operand 17 states. [2018-12-03 16:14:45,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:14:45,079 INFO L93 Difference]: Finished difference Result 2749 states and 4310 transitions. [2018-12-03 16:14:45,080 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 16:14:45,080 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 21 [2018-12-03 16:14:45,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:14:45,082 INFO L225 Difference]: With dead ends: 2749 [2018-12-03 16:14:45,082 INFO L226 Difference]: Without dead ends: 2747 [2018-12-03 16:14:45,083 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 5 DeprecatedPredicates, 2774 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1602, Invalid=7710, Unknown=0, NotChecked=0, Total=9312 [2018-12-03 16:14:45,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2747 states. [2018-12-03 16:14:46,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2747 to 2110. [2018-12-03 16:14:46,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2110 states. [2018-12-03 16:14:46,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2110 states to 2110 states and 3334 transitions. [2018-12-03 16:14:46,011 INFO L78 Accepts]: Start accepts. Automaton has 2110 states and 3334 transitions. Word has length 21 [2018-12-03 16:14:46,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:14:46,011 INFO L480 AbstractCegarLoop]: Abstraction has 2110 states and 3334 transitions. [2018-12-03 16:14:46,012 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 16:14:46,012 INFO L276 IsEmpty]: Start isEmpty. Operand 2110 states and 3334 transitions. [2018-12-03 16:14:46,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 16:14:46,012 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:14:46,012 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:14:46,013 INFO L423 AbstractCegarLoop]: === Iteration 71 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:14:46,013 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:46,013 INFO L82 PathProgramCache]: Analyzing trace with hash -1673653662, now seen corresponding path program 2 times [2018-12-03 16:14:46,013 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:14:46,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:46,014 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:14:46,014 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:46,014 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:14:46,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:46,851 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:46,852 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:46,852 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:14:46,852 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:14:46,852 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:14:46,852 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:46,852 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 16:14:46,862 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:14:46,862 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:14:46,873 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-12-03 16:14:46,873 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:14:46,874 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:14:46,993 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:14:46,993 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:14:47,139 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:14:47,159 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:14:47,159 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 23 [2018-12-03 16:14:47,159 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:14:47,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 16:14:47,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 16:14:47,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=476, Unknown=0, NotChecked=0, Total=552 [2018-12-03 16:14:47,160 INFO L87 Difference]: Start difference. First operand 2110 states and 3334 transitions. Second operand 16 states. [2018-12-03 16:14:49,025 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2018-12-03 16:14:49,928 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2018-12-03 16:14:51,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:14:51,702 INFO L93 Difference]: Finished difference Result 2376 states and 3732 transitions. [2018-12-03 16:14:51,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-03 16:14:51,703 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 21 [2018-12-03 16:14:51,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:14:51,705 INFO L225 Difference]: With dead ends: 2376 [2018-12-03 16:14:51,705 INFO L226 Difference]: Without dead ends: 2374 [2018-12-03 16:14:51,705 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 689 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=670, Invalid=2990, Unknown=0, NotChecked=0, Total=3660 [2018-12-03 16:14:51,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2374 states. [2018-12-03 16:14:52,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2374 to 2107. [2018-12-03 16:14:52,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2107 states. [2018-12-03 16:14:52,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2107 states to 2107 states and 3325 transitions. [2018-12-03 16:14:52,647 INFO L78 Accepts]: Start accepts. Automaton has 2107 states and 3325 transitions. Word has length 21 [2018-12-03 16:14:52,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:14:52,647 INFO L480 AbstractCegarLoop]: Abstraction has 2107 states and 3325 transitions. [2018-12-03 16:14:52,647 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 16:14:52,647 INFO L276 IsEmpty]: Start isEmpty. Operand 2107 states and 3325 transitions. [2018-12-03 16:14:52,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-03 16:14:52,648 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:14:52,648 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 16:14:52,648 INFO L423 AbstractCegarLoop]: === Iteration 72 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:14:52,648 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:52,648 INFO L82 PathProgramCache]: Analyzing trace with hash 1977173104, now seen corresponding path program 1 times [2018-12-03 16:14:52,649 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:14:52,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:52,649 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:14:52,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:14:52,649 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:14:52,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:52,900 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:52,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:52,901 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:14:52,901 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 24 with the following transitions: [2018-12-03 16:14:52,901 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [25], [27], [29], [32], [65], [66], [67], [70], [72] [2018-12-03 16:14:52,902 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:14:52,902 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:14:52,910 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:14:52,911 INFO L272 AbstractInterpreter]: Visited 14 different actions 37 times. Merged at 12 different actions 18 times. Widened at 1 different actions 1 times. Found 9 fixpoints after 5 different actions. Largest state had 0 variables. [2018-12-03 16:14:52,914 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:14:52,914 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:14:52,914 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:14:52,914 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 16:14:52,925 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:14:52,925 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:14:52,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:14:52,936 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:14:53,100 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:53,100 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:14:53,264 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:14:53,283 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:14:53,283 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 10] total 30 [2018-12-03 16:14:53,284 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:14:53,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 16:14:53,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 16:14:53,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=826, Unknown=0, NotChecked=0, Total=930 [2018-12-03 16:14:53,284 INFO L87 Difference]: Start difference. First operand 2107 states and 3325 transitions. Second operand 22 states. [2018-12-03 16:15:01,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:15:01,776 INFO L93 Difference]: Finished difference Result 3897 states and 6034 transitions. [2018-12-03 16:15:01,776 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2018-12-03 16:15:01,776 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 23 [2018-12-03 16:15:01,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:15:01,779 INFO L225 Difference]: With dead ends: 3897 [2018-12-03 16:15:01,779 INFO L226 Difference]: Without dead ends: 3746 [2018-12-03 16:15:01,780 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5651 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2523, Invalid=14247, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 16:15:01,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3746 states. [2018-12-03 16:15:03,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3746 to 2541. [2018-12-03 16:15:03,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2541 states. [2018-12-03 16:15:03,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2541 states to 2541 states and 3965 transitions. [2018-12-03 16:15:03,074 INFO L78 Accepts]: Start accepts. Automaton has 2541 states and 3965 transitions. Word has length 23 [2018-12-03 16:15:03,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:15:03,074 INFO L480 AbstractCegarLoop]: Abstraction has 2541 states and 3965 transitions. [2018-12-03 16:15:03,074 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 16:15:03,074 INFO L276 IsEmpty]: Start isEmpty. Operand 2541 states and 3965 transitions. [2018-12-03 16:15:03,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-03 16:15:03,075 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:15:03,075 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:15:03,075 INFO L423 AbstractCegarLoop]: === Iteration 73 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:15:03,075 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:15:03,075 INFO L82 PathProgramCache]: Analyzing trace with hash 1266805704, now seen corresponding path program 1 times [2018-12-03 16:15:03,076 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:15:03,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:03,076 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:15:03,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:03,076 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:15:03,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:15:03,217 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:15:03,218 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:03,218 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:15:03,218 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 24 with the following transitions: [2018-12-03 16:15:03,218 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [22], [27], [29], [32], [56], [58], [61], [65], [66], [67], [70], [72] [2018-12-03 16:15:03,218 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:15:03,219 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:15:03,230 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:15:03,230 INFO L272 AbstractInterpreter]: Visited 16 different actions 43 times. Merged at 14 different actions 20 times. Widened at 1 different actions 1 times. Found 11 fixpoints after 6 different actions. Largest state had 0 variables. [2018-12-03 16:15:03,249 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:15:03,249 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:15:03,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:03,249 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 16:15:03,258 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:15:03,258 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:15:03,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:15:03,268 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:15:03,408 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:15:03,408 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:15:03,556 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:15:03,574 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:15:03,575 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 9] total 28 [2018-12-03 16:15:03,575 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:15:03,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 16:15:03,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 16:15:03,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=725, Unknown=0, NotChecked=0, Total=812 [2018-12-03 16:15:03,575 INFO L87 Difference]: Start difference. First operand 2541 states and 3965 transitions. Second operand 21 states. [2018-12-03 16:15:09,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:15:09,983 INFO L93 Difference]: Finished difference Result 3874 states and 5970 transitions. [2018-12-03 16:15:09,984 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 16:15:09,984 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 23 [2018-12-03 16:15:09,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:15:09,987 INFO L225 Difference]: With dead ends: 3874 [2018-12-03 16:15:09,987 INFO L226 Difference]: Without dead ends: 3748 [2018-12-03 16:15:09,988 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1351 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1076, Invalid=4776, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 16:15:09,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3748 states. [2018-12-03 16:15:11,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3748 to 2841. [2018-12-03 16:15:11,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2841 states. [2018-12-03 16:15:11,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2841 states to 2841 states and 4404 transitions. [2018-12-03 16:15:11,536 INFO L78 Accepts]: Start accepts. Automaton has 2841 states and 4404 transitions. Word has length 23 [2018-12-03 16:15:11,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:15:11,536 INFO L480 AbstractCegarLoop]: Abstraction has 2841 states and 4404 transitions. [2018-12-03 16:15:11,537 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 16:15:11,537 INFO L276 IsEmpty]: Start isEmpty. Operand 2841 states and 4404 transitions. [2018-12-03 16:15:11,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-03 16:15:11,538 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:15:11,538 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:15:11,538 INFO L423 AbstractCegarLoop]: === Iteration 74 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:15:11,538 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:15:11,538 INFO L82 PathProgramCache]: Analyzing trace with hash -407447728, now seen corresponding path program 1 times [2018-12-03 16:15:11,538 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:15:11,539 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:11,539 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:15:11,539 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:11,539 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:15:11,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:15:11,701 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:15:11,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:11,702 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:15:11,702 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 24 with the following transitions: [2018-12-03 16:15:11,702 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [22], [25], [27], [38], [41], [56], [57], [65], [67], [70], [72] [2018-12-03 16:15:11,703 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:15:11,703 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:15:11,708 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:15:11,709 INFO L272 AbstractInterpreter]: Visited 15 different actions 28 times. Merged at 11 different actions 11 times. Never widened. Found 5 fixpoints after 5 different actions. Largest state had 0 variables. [2018-12-03 16:15:11,729 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:15:11,729 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:15:11,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:11,729 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 16:15:11,737 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:15:11,737 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:15:11,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:15:11,746 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:15:11,898 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:15:11,898 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:15:12,039 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:15:12,058 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:15:12,058 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9, 9] total 29 [2018-12-03 16:15:12,058 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:15:12,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 16:15:12,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 16:15:12,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=778, Unknown=0, NotChecked=0, Total=870 [2018-12-03 16:15:12,059 INFO L87 Difference]: Start difference. First operand 2841 states and 4404 transitions. Second operand 22 states. [2018-12-03 16:15:17,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:15:17,093 INFO L93 Difference]: Finished difference Result 3578 states and 5576 transitions. [2018-12-03 16:15:17,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-03 16:15:17,094 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 23 [2018-12-03 16:15:17,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:15:17,097 INFO L225 Difference]: With dead ends: 3578 [2018-12-03 16:15:17,097 INFO L226 Difference]: Without dead ends: 3491 [2018-12-03 16:15:17,099 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1327 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1036, Invalid=4664, Unknown=0, NotChecked=0, Total=5700 [2018-12-03 16:15:17,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3491 states. [2018-12-03 16:15:18,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3491 to 3037. [2018-12-03 16:15:18,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3037 states. [2018-12-03 16:15:18,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3037 states to 3037 states and 4681 transitions. [2018-12-03 16:15:18,786 INFO L78 Accepts]: Start accepts. Automaton has 3037 states and 4681 transitions. Word has length 23 [2018-12-03 16:15:18,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:15:18,787 INFO L480 AbstractCegarLoop]: Abstraction has 3037 states and 4681 transitions. [2018-12-03 16:15:18,787 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 16:15:18,787 INFO L276 IsEmpty]: Start isEmpty. Operand 3037 states and 4681 transitions. [2018-12-03 16:15:18,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 16:15:18,788 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:15:18,788 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:15:18,788 INFO L423 AbstractCegarLoop]: === Iteration 75 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:15:18,788 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:15:18,788 INFO L82 PathProgramCache]: Analyzing trace with hash -691565553, now seen corresponding path program 1 times [2018-12-03 16:15:18,788 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:15:18,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:18,789 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:15:18,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:18,789 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:15:18,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:15:18,993 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:15:18,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:18,993 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:15:18,993 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-12-03 16:15:18,994 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [25], [27], [29], [32], [45], [46], [47], [50], [65], [67], [70], [72] [2018-12-03 16:15:18,994 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:15:18,995 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:15:19,009 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:15:19,009 INFO L272 AbstractInterpreter]: Visited 19 different actions 51 times. Merged at 17 different actions 25 times. Widened at 1 different actions 1 times. Found 12 fixpoints after 7 different actions. Largest state had 0 variables. [2018-12-03 16:15:19,026 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:15:19,026 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:15:19,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:19,026 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 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:15:19,034 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:15:19,034 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:15:19,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:15:19,042 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:15:19,125 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:15:19,126 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:15:19,247 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:15:19,265 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:15:19,266 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 22 [2018-12-03 16:15:19,266 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:15:19,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 16:15:19,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 16:15:19,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=441, Unknown=0, NotChecked=0, Total=506 [2018-12-03 16:15:19,267 INFO L87 Difference]: Start difference. First operand 3037 states and 4681 transitions. Second operand 15 states. [2018-12-03 16:15:23,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:15:23,049 INFO L93 Difference]: Finished difference Result 3486 states and 5344 transitions. [2018-12-03 16:15:23,049 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 16:15:23,050 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 24 [2018-12-03 16:15:23,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:15:23,052 INFO L225 Difference]: With dead ends: 3486 [2018-12-03 16:15:23,052 INFO L226 Difference]: Without dead ends: 3465 [2018-12-03 16:15:23,053 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=266, Invalid=1374, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 16:15:23,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3465 states. [2018-12-03 16:15:24,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3465 to 2930. [2018-12-03 16:15:24,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2930 states. [2018-12-03 16:15:24,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2930 states to 2930 states and 4522 transitions. [2018-12-03 16:15:24,711 INFO L78 Accepts]: Start accepts. Automaton has 2930 states and 4522 transitions. Word has length 24 [2018-12-03 16:15:24,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:15:24,711 INFO L480 AbstractCegarLoop]: Abstraction has 2930 states and 4522 transitions. [2018-12-03 16:15:24,711 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 16:15:24,711 INFO L276 IsEmpty]: Start isEmpty. Operand 2930 states and 4522 transitions. [2018-12-03 16:15:24,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 16:15:24,712 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:15:24,712 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 16:15:24,712 INFO L423 AbstractCegarLoop]: === Iteration 76 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:15:24,713 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:15:24,713 INFO L82 PathProgramCache]: Analyzing trace with hash -1117536148, now seen corresponding path program 1 times [2018-12-03 16:15:24,713 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:15:24,713 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:24,713 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:15:24,713 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:24,713 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:15:24,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:15:24,884 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 1 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:15:24,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:24,884 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:15:24,884 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-12-03 16:15:24,884 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [20], [21], [22], [25], [29], [32], [65], [67], [70], [72] [2018-12-03 16:15:24,885 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:15:24,885 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:15:24,893 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:15:24,894 INFO L272 AbstractInterpreter]: Visited 13 different actions 31 times. Merged at 10 different actions 14 times. Widened at 1 different actions 1 times. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 16:15:24,904 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:15:24,904 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:15:24,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:24,904 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 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:15:24,912 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:15:24,912 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:15:24,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:15:24,923 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:15:25,198 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 1 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:15:25,198 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:15:25,354 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 5 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:15:25,373 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:15:25,373 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 10] total 28 [2018-12-03 16:15:25,373 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:15:25,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 16:15:25,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 16:15:25,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=723, Unknown=0, NotChecked=0, Total=812 [2018-12-03 16:15:25,374 INFO L87 Difference]: Start difference. First operand 2930 states and 4522 transitions. Second operand 20 states. [2018-12-03 16:15:37,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:15:37,322 INFO L93 Difference]: Finished difference Result 5118 states and 7821 transitions. [2018-12-03 16:15:37,323 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2018-12-03 16:15:37,323 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 24 [2018-12-03 16:15:37,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:15:37,327 INFO L225 Difference]: With dead ends: 5118 [2018-12-03 16:15:37,327 INFO L226 Difference]: Without dead ends: 5091 [2018-12-03 16:15:37,328 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 3841 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=2727, Invalid=10613, Unknown=0, NotChecked=0, Total=13340 [2018-12-03 16:15:37,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5091 states. [2018-12-03 16:15:39,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5091 to 2810. [2018-12-03 16:15:39,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2810 states. [2018-12-03 16:15:39,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2810 states to 2810 states and 4329 transitions. [2018-12-03 16:15:39,093 INFO L78 Accepts]: Start accepts. Automaton has 2810 states and 4329 transitions. Word has length 24 [2018-12-03 16:15:39,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:15:39,093 INFO L480 AbstractCegarLoop]: Abstraction has 2810 states and 4329 transitions. [2018-12-03 16:15:39,093 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 16:15:39,093 INFO L276 IsEmpty]: Start isEmpty. Operand 2810 states and 4329 transitions. [2018-12-03 16:15:39,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 16:15:39,094 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:15:39,094 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2018-12-03 16:15:39,095 INFO L423 AbstractCegarLoop]: === Iteration 77 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:15:39,095 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:15:39,095 INFO L82 PathProgramCache]: Analyzing trace with hash 1435449349, now seen corresponding path program 3 times [2018-12-03 16:15:39,095 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:15:39,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:39,095 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:15:39,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:39,096 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:15:39,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:15:39,193 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:15:39,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:39,193 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:15:39,193 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:15:39,193 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:15:39,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:39,193 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 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:15:39,202 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:15:39,203 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:15:39,210 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:15:39,210 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:15:39,211 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:15:39,370 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:15:39,370 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:15:39,499 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 22 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:15:39,518 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:15:39,519 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9] total 24 [2018-12-03 16:15:39,519 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:15:39,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 16:15:39,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 16:15:39,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=468, Unknown=0, NotChecked=0, Total=552 [2018-12-03 16:15:39,519 INFO L87 Difference]: Start difference. First operand 2810 states and 4329 transitions. Second operand 19 states. [2018-12-03 16:15:48,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:15:48,011 INFO L93 Difference]: Finished difference Result 6097 states and 9340 transitions. [2018-12-03 16:15:48,011 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2018-12-03 16:15:48,012 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 24 [2018-12-03 16:15:48,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:15:48,015 INFO L225 Difference]: With dead ends: 6097 [2018-12-03 16:15:48,015 INFO L226 Difference]: Without dead ends: 3186 [2018-12-03 16:15:48,018 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 3443 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2031, Invalid=9525, Unknown=0, NotChecked=0, Total=11556 [2018-12-03 16:15:48,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3186 states. [2018-12-03 16:15:49,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3186 to 2459. [2018-12-03 16:15:49,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2459 states. [2018-12-03 16:15:49,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2459 states to 2459 states and 3787 transitions. [2018-12-03 16:15:49,587 INFO L78 Accepts]: Start accepts. Automaton has 2459 states and 3787 transitions. Word has length 24 [2018-12-03 16:15:49,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:15:49,588 INFO L480 AbstractCegarLoop]: Abstraction has 2459 states and 3787 transitions. [2018-12-03 16:15:49,588 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 16:15:49,588 INFO L276 IsEmpty]: Start isEmpty. Operand 2459 states and 3787 transitions. [2018-12-03 16:15:49,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 16:15:49,589 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:15:49,589 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:15:49,589 INFO L423 AbstractCegarLoop]: === Iteration 78 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:15:49,589 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:15:49,589 INFO L82 PathProgramCache]: Analyzing trace with hash -746134513, now seen corresponding path program 1 times [2018-12-03 16:15:49,589 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:15:49,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:49,590 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:15:49,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:49,590 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:15:49,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:15:49,866 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:15:49,866 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:49,866 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:15:49,866 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-12-03 16:15:49,867 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [29], [32], [45], [46], [47], [50], [56], [58], [61], [63], [65], [67], [70], [72] [2018-12-03 16:15:49,867 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:15:49,867 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:15:49,875 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:15:49,875 INFO L272 AbstractInterpreter]: Visited 17 different actions 34 times. Merged at 9 different actions 12 times. Never widened. Found 9 fixpoints after 6 different actions. Largest state had 0 variables. [2018-12-03 16:15:49,902 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:15:49,902 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:15:49,903 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:49,903 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 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:15:49,940 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:15:49,941 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:15:49,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:15:49,951 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:15:50,015 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:15:50,015 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:15:50,123 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:15:50,141 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:15:50,141 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 22 [2018-12-03 16:15:50,141 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:15:50,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 16:15:50,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 16:15:50,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2018-12-03 16:15:50,142 INFO L87 Difference]: Start difference. First operand 2459 states and 3787 transitions. Second operand 15 states. [2018-12-03 16:15:54,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:15:54,467 INFO L93 Difference]: Finished difference Result 2989 states and 4596 transitions. [2018-12-03 16:15:54,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-12-03 16:15:54,468 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 24 [2018-12-03 16:15:54,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:15:54,471 INFO L225 Difference]: With dead ends: 2989 [2018-12-03 16:15:54,471 INFO L226 Difference]: Without dead ends: 2987 [2018-12-03 16:15:54,472 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 503 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=475, Invalid=2177, Unknown=0, NotChecked=0, Total=2652 [2018-12-03 16:15:54,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2987 states. [2018-12-03 16:15:55,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2987 to 2345. [2018-12-03 16:15:55,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2345 states. [2018-12-03 16:15:55,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2345 states to 2345 states and 3614 transitions. [2018-12-03 16:15:55,998 INFO L78 Accepts]: Start accepts. Automaton has 2345 states and 3614 transitions. Word has length 24 [2018-12-03 16:15:55,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:15:55,998 INFO L480 AbstractCegarLoop]: Abstraction has 2345 states and 3614 transitions. [2018-12-03 16:15:55,998 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 16:15:55,998 INFO L276 IsEmpty]: Start isEmpty. Operand 2345 states and 3614 transitions. [2018-12-03 16:15:55,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 16:15:55,999 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:15:55,999 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2018-12-03 16:15:56,000 INFO L423 AbstractCegarLoop]: === Iteration 79 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:15:56,000 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:15:56,000 INFO L82 PathProgramCache]: Analyzing trace with hash -136248690, now seen corresponding path program 3 times [2018-12-03 16:15:56,000 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:15:56,000 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:56,000 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:15:56,001 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:15:56,001 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:15:56,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:15:56,088 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:15:56,088 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:56,088 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:15:56,088 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:15:56,088 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:15:56,088 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:15:56,088 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 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:15:56,096 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:15:56,096 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:15:56,104 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:15:56,104 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:15:56,105 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:15:56,239 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:15:56,240 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:15:56,354 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 22 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:15:56,373 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:15:56,373 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 22 [2018-12-03 16:15:56,373 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:15:56,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 16:15:56,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 16:15:56,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=390, Unknown=0, NotChecked=0, Total=462 [2018-12-03 16:15:56,374 INFO L87 Difference]: Start difference. First operand 2345 states and 3614 transitions. Second operand 17 states. [2018-12-03 16:16:00,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:16:00,816 INFO L93 Difference]: Finished difference Result 4969 states and 7657 transitions. [2018-12-03 16:16:00,816 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-03 16:16:00,816 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2018-12-03 16:16:00,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:16:00,819 INFO L225 Difference]: With dead ends: 4969 [2018-12-03 16:16:00,819 INFO L226 Difference]: Without dead ends: 2625 [2018-12-03 16:16:00,821 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 833 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=632, Invalid=3274, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 16:16:00,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2625 states. [2018-12-03 16:16:02,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2625 to 2252. [2018-12-03 16:16:02,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2252 states. [2018-12-03 16:16:02,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2252 states to 2252 states and 3457 transitions. [2018-12-03 16:16:02,315 INFO L78 Accepts]: Start accepts. Automaton has 2252 states and 3457 transitions. Word has length 24 [2018-12-03 16:16:02,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:16:02,315 INFO L480 AbstractCegarLoop]: Abstraction has 2252 states and 3457 transitions. [2018-12-03 16:16:02,315 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 16:16:02,315 INFO L276 IsEmpty]: Start isEmpty. Operand 2252 states and 3457 transitions. [2018-12-03 16:16:02,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 16:16:02,316 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:16:02,316 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:16:02,316 INFO L423 AbstractCegarLoop]: === Iteration 80 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:16:02,316 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:16:02,317 INFO L82 PathProgramCache]: Analyzing trace with hash -518454402, now seen corresponding path program 1 times [2018-12-03 16:16:02,317 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:16:02,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:16:02,317 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:16:02,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:16:02,317 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:16:02,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:16:02,437 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:16:02,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:16:02,438 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:16:02,438 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-12-03 16:16:02,438 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [25], [27], [38], [41], [45], [47], [50], [65], [67], [72] [2018-12-03 16:16:02,439 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:16:02,439 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:16:02,452 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:16:02,452 INFO L272 AbstractInterpreter]: Visited 18 different actions 49 times. Merged at 16 different actions 25 times. Widened at 1 different actions 1 times. Found 10 fixpoints after 6 different actions. Largest state had 0 variables. [2018-12-03 16:16:02,456 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:16:02,456 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:16:02,456 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:16:02,456 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 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:16:02,464 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:16:02,464 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:16:02,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:16:02,472 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:16:02,537 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:16:02,537 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:16:02,647 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:16:02,665 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:16:02,665 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 23 [2018-12-03 16:16:02,665 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:16:02,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 16:16:02,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 16:16:02,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2018-12-03 16:16:02,666 INFO L87 Difference]: Start difference. First operand 2252 states and 3457 transitions. Second operand 16 states. [2018-12-03 16:16:05,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:16:05,984 INFO L93 Difference]: Finished difference Result 2386 states and 3653 transitions. [2018-12-03 16:16:05,985 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-12-03 16:16:05,985 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 24 [2018-12-03 16:16:05,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:16:05,987 INFO L225 Difference]: With dead ends: 2386 [2018-12-03 16:16:05,987 INFO L226 Difference]: Without dead ends: 2384 [2018-12-03 16:16:05,988 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=352, Invalid=2000, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 16:16:05,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2384 states. [2018-12-03 16:16:07,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2384 to 2247. [2018-12-03 16:16:07,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2247 states. [2018-12-03 16:16:07,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2247 states to 2247 states and 3447 transitions. [2018-12-03 16:16:07,522 INFO L78 Accepts]: Start accepts. Automaton has 2247 states and 3447 transitions. Word has length 24 [2018-12-03 16:16:07,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:16:07,522 INFO L480 AbstractCegarLoop]: Abstraction has 2247 states and 3447 transitions. [2018-12-03 16:16:07,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 16:16:07,522 INFO L276 IsEmpty]: Start isEmpty. Operand 2247 states and 3447 transitions. [2018-12-03 16:16:07,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-12-03 16:16:07,524 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:16:07,524 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2018-12-03 16:16:07,524 INFO L423 AbstractCegarLoop]: === Iteration 81 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:16:07,524 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:16:07,524 INFO L82 PathProgramCache]: Analyzing trace with hash 1962007824, now seen corresponding path program 4 times [2018-12-03 16:16:07,524 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:16:07,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:16:07,525 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:16:07,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:16:07,525 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:16:07,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:16:07,675 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 1 proven. 41 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:16:07,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:16:07,676 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:16:07,676 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:16:07,676 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:16:07,676 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:16:07,676 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 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:16:07,684 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:16:07,684 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:16:07,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:16:07,695 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:16:07,817 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 29 proven. 9 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-12-03 16:16:07,817 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:16:07,980 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 35 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-12-03 16:16:08,005 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:16:08,005 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 9] total 24 [2018-12-03 16:16:08,005 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:16:08,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 16:16:08,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 16:16:08,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=475, Unknown=0, NotChecked=0, Total=552 [2018-12-03 16:16:08,006 INFO L87 Difference]: Start difference. First operand 2247 states and 3447 transitions. Second operand 20 states. [2018-12-03 16:16:12,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:16:12,553 INFO L93 Difference]: Finished difference Result 5402 states and 8288 transitions. [2018-12-03 16:16:12,553 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 16:16:12,553 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 29 [2018-12-03 16:16:12,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:16:12,556 INFO L225 Difference]: With dead ends: 5402 [2018-12-03 16:16:12,556 INFO L226 Difference]: Without dead ends: 3156 [2018-12-03 16:16:12,558 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 856 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=616, Invalid=3290, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 16:16:12,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3156 states. [2018-12-03 16:16:14,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3156 to 2608. [2018-12-03 16:16:14,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2608 states. [2018-12-03 16:16:14,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2608 states to 2608 states and 4009 transitions. [2018-12-03 16:16:14,209 INFO L78 Accepts]: Start accepts. Automaton has 2608 states and 4009 transitions. Word has length 29 [2018-12-03 16:16:14,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:16:14,209 INFO L480 AbstractCegarLoop]: Abstraction has 2608 states and 4009 transitions. [2018-12-03 16:16:14,209 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 16:16:14,209 INFO L276 IsEmpty]: Start isEmpty. Operand 2608 states and 4009 transitions. [2018-12-03 16:16:14,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-12-03 16:16:14,210 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:16:14,211 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:16:14,211 INFO L423 AbstractCegarLoop]: === Iteration 82 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:16:14,211 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:16:14,211 INFO L82 PathProgramCache]: Analyzing trace with hash 524508242, now seen corresponding path program 1 times [2018-12-03 16:16:14,211 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:16:14,212 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:16:14,212 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:16:14,212 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:16:14,212 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:16:14,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:16:14,387 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:16:14,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:16:14,387 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:16:14,387 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 30 with the following transitions: [2018-12-03 16:16:14,387 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [25], [27], [38], [41], [56], [58], [61], [63], [65], [67], [70], [72] [2018-12-03 16:16:14,388 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:16:14,388 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:16:14,400 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:16:14,400 INFO L272 AbstractInterpreter]: Visited 20 different actions 51 times. Merged at 17 different actions 23 times. Never widened. Found 14 fixpoints after 9 different actions. Largest state had 0 variables. [2018-12-03 16:16:14,442 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:16:14,442 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:16:14,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:16:14,442 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 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:16:14,456 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:16:14,456 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:16:14,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:16:14,478 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:16:15,370 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:16:15,370 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:16:15,520 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:16:15,539 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:16:15,539 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 25 [2018-12-03 16:16:15,539 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:16:15,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 16:16:15,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 16:16:15,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=570, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:16:15,540 INFO L87 Difference]: Start difference. First operand 2608 states and 4009 transitions. Second operand 17 states. [2018-12-03 16:16:25,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:16:25,696 INFO L93 Difference]: Finished difference Result 4851 states and 7526 transitions. [2018-12-03 16:16:25,696 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2018-12-03 16:16:25,696 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 29 [2018-12-03 16:16:25,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:16:25,701 INFO L225 Difference]: With dead ends: 4851 [2018-12-03 16:16:25,702 INFO L226 Difference]: Without dead ends: 4822 [2018-12-03 16:16:25,704 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3927 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=2180, Invalid=10702, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 16:16:25,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4822 states. [2018-12-03 16:16:28,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4822 to 3122. [2018-12-03 16:16:28,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3122 states. [2018-12-03 16:16:28,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3122 states to 3122 states and 4833 transitions. [2018-12-03 16:16:28,423 INFO L78 Accepts]: Start accepts. Automaton has 3122 states and 4833 transitions. Word has length 29 [2018-12-03 16:16:28,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:16:28,423 INFO L480 AbstractCegarLoop]: Abstraction has 3122 states and 4833 transitions. [2018-12-03 16:16:28,423 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 16:16:28,423 INFO L276 IsEmpty]: Start isEmpty. Operand 3122 states and 4833 transitions. [2018-12-03 16:16:28,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-12-03 16:16:28,425 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:16:28,425 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2018-12-03 16:16:28,425 INFO L423 AbstractCegarLoop]: === Iteration 83 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:16:28,425 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:16:28,425 INFO L82 PathProgramCache]: Analyzing trace with hash -1958472419, now seen corresponding path program 4 times [2018-12-03 16:16:28,425 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:16:28,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:16:28,426 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:16:28,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:16:28,426 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:16:28,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:16:28,610 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:16:28,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:16:28,610 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:16:28,610 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:16:28,610 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:16:28,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:16:28,610 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 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:16:28,618 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:16:28,618 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:16:28,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:16:28,628 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:16:28,729 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 1 proven. 44 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:16:28,730 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:16:28,882 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 5 proven. 40 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:16:28,903 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:16:28,903 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 25 [2018-12-03 16:16:28,903 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:16:28,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 16:16:28,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 16:16:28,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=570, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:16:28,904 INFO L87 Difference]: Start difference. First operand 3122 states and 4833 transitions. Second operand 17 states. [2018-12-03 16:16:38,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:16:38,464 INFO L93 Difference]: Finished difference Result 4638 states and 7146 transitions. [2018-12-03 16:16:38,465 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 16:16:38,465 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 29 [2018-12-03 16:16:38,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:16:38,469 INFO L225 Difference]: With dead ends: 4638 [2018-12-03 16:16:38,469 INFO L226 Difference]: Without dead ends: 4601 [2018-12-03 16:16:38,470 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2542 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1860, Invalid=7452, Unknown=0, NotChecked=0, Total=9312 [2018-12-03 16:16:38,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4601 states. [2018-12-03 16:16:40,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4601 to 2921. [2018-12-03 16:16:40,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2921 states. [2018-12-03 16:16:40,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2921 states to 2921 states and 4479 transitions. [2018-12-03 16:16:40,469 INFO L78 Accepts]: Start accepts. Automaton has 2921 states and 4479 transitions. Word has length 29 [2018-12-03 16:16:40,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:16:40,470 INFO L480 AbstractCegarLoop]: Abstraction has 2921 states and 4479 transitions. [2018-12-03 16:16:40,470 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 16:16:40,470 INFO L276 IsEmpty]: Start isEmpty. Operand 2921 states and 4479 transitions. [2018-12-03 16:16:40,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-12-03 16:16:40,472 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:16:40,472 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:16:40,472 INFO L423 AbstractCegarLoop]: === Iteration 84 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:16:40,472 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:16:40,472 INFO L82 PathProgramCache]: Analyzing trace with hash 1748672885, now seen corresponding path program 1 times [2018-12-03 16:16:40,472 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:16:40,473 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:16:40,473 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:16:40,473 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:16:40,473 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:16:40,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:16:40,692 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 23 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:16:40,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:16:40,692 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:16:40,692 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2018-12-03 16:16:40,693 INFO L205 CegarAbsIntRunner]: [0], [11], [14], [20], [22], [25], [27], [38], [41], [56], [57], [58], [61], [63], [65], [67], [70], [72] [2018-12-03 16:16:40,693 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:16:40,693 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:16:40,700 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:16:40,700 INFO L272 AbstractInterpreter]: Visited 18 different actions 38 times. Merged at 12 different actions 15 times. Never widened. Found 10 fixpoints after 7 different actions. Largest state had 0 variables. [2018-12-03 16:16:40,701 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:16:40,701 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:16:40,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:16:40,701 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 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:16:40,713 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:16:40,713 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:16:40,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:16:40,726 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:16:40,922 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:16:40,922 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:16:41,139 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 5 proven. 19 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:16:41,157 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:16:41,158 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 11] total 33 [2018-12-03 16:16:41,158 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:16:41,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-03 16:16:41,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-03 16:16:41,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=999, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 16:16:41,158 INFO L87 Difference]: Start difference. First operand 2921 states and 4479 transitions. Second operand 24 states. [2018-12-03 16:17:04,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:17:04,849 INFO L93 Difference]: Finished difference Result 7278 states and 11277 transitions. [2018-12-03 16:17:04,849 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 217 states. [2018-12-03 16:17:04,849 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2018-12-03 16:17:04,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:17:04,854 INFO L225 Difference]: With dead ends: 7278 [2018-12-03 16:17:04,854 INFO L226 Difference]: Without dead ends: 7090 [2018-12-03 16:17:04,857 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 244 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23502 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=7275, Invalid=52995, Unknown=0, NotChecked=0, Total=60270 [2018-12-03 16:17:04,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7090 states. [2018-12-03 16:17:07,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7090 to 4053. [2018-12-03 16:17:07,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4053 states. [2018-12-03 16:17:07,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4053 states to 4053 states and 6243 transitions. [2018-12-03 16:17:07,673 INFO L78 Accepts]: Start accepts. Automaton has 4053 states and 6243 transitions. Word has length 31 [2018-12-03 16:17:07,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:17:07,674 INFO L480 AbstractCegarLoop]: Abstraction has 4053 states and 6243 transitions. [2018-12-03 16:17:07,674 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-03 16:17:07,674 INFO L276 IsEmpty]: Start isEmpty. Operand 4053 states and 6243 transitions. [2018-12-03 16:17:07,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 16:17:07,676 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:17:07,676 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:17:07,676 INFO L423 AbstractCegarLoop]: === Iteration 85 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:17:07,676 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:17:07,676 INFO L82 PathProgramCache]: Analyzing trace with hash 241236497, now seen corresponding path program 2 times [2018-12-03 16:17:07,677 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:17:07,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:17:07,677 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:17:07,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:17:07,678 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:17:07,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:17:07,809 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 23 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:17:07,809 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:17:07,810 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:17:07,810 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:17:07,810 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:17:07,810 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:17:07,810 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 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:17:07,818 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:17:07,818 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:17:07,830 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 16:17:07,831 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:17:07,832 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:17:08,310 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 1 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 16:17:08,310 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:17:08,501 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 16:17:08,521 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:17:08,521 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 10] total 28 [2018-12-03 16:17:08,521 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:17:08,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 16:17:08,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 16:17:08,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=708, Unknown=0, NotChecked=0, Total=812 [2018-12-03 16:17:08,522 INFO L87 Difference]: Start difference. First operand 4053 states and 6243 transitions. Second operand 20 states. [2018-12-03 16:17:12,166 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2018-12-03 16:17:20,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:17:20,904 INFO L93 Difference]: Finished difference Result 6387 states and 9815 transitions. [2018-12-03 16:17:20,904 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-12-03 16:17:20,904 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 32 [2018-12-03 16:17:20,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:17:20,908 INFO L225 Difference]: With dead ends: 6387 [2018-12-03 16:17:20,909 INFO L226 Difference]: Without dead ends: 6385 [2018-12-03 16:17:20,910 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2099 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1096, Invalid=7276, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 16:17:20,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6385 states. [2018-12-03 16:17:23,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6385 to 4730. [2018-12-03 16:17:23,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4730 states. [2018-12-03 16:17:23,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4730 states to 4730 states and 7301 transitions. [2018-12-03 16:17:23,993 INFO L78 Accepts]: Start accepts. Automaton has 4730 states and 7301 transitions. Word has length 32 [2018-12-03 16:17:23,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:17:23,993 INFO L480 AbstractCegarLoop]: Abstraction has 4730 states and 7301 transitions. [2018-12-03 16:17:23,993 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 16:17:23,993 INFO L276 IsEmpty]: Start isEmpty. Operand 4730 states and 7301 transitions. [2018-12-03 16:17:23,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 16:17:23,996 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:17:23,996 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:17:23,996 INFO L423 AbstractCegarLoop]: === Iteration 86 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:17:23,996 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:17:23,996 INFO L82 PathProgramCache]: Analyzing trace with hash 1235175139, now seen corresponding path program 1 times [2018-12-03 16:17:23,996 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:17:23,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:17:23,997 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:17:23,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:17:23,997 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:17:23,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:17:24,220 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:17:24,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:17:24,221 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:17:24,221 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 33 with the following transitions: [2018-12-03 16:17:24,221 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [25], [27], [38], [41], [45], [47], [50], [56], [58], [61], [63], [65], [67], [72] [2018-12-03 16:17:24,222 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:17:24,222 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:17:24,236 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:17:24,236 INFO L272 AbstractInterpreter]: Visited 22 different actions 59 times. Merged at 19 different actions 27 times. Widened at 1 different actions 1 times. Found 16 fixpoints after 9 different actions. Largest state had 0 variables. [2018-12-03 16:17:24,273 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:17:24,273 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:17:24,273 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:17:24,273 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 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:17:24,289 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:17:24,290 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:17:24,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:17:24,314 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:17:24,413 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 2 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 16:17:24,413 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:17:24,548 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 2 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 16:17:24,566 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:17:24,566 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 10] total 25 [2018-12-03 16:17:24,566 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:17:24,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 16:17:24,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 16:17:24,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:17:24,567 INFO L87 Difference]: Start difference. First operand 4730 states and 7301 transitions. Second operand 17 states. [2018-12-03 16:17:30,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:17:30,100 INFO L93 Difference]: Finished difference Result 5039 states and 7773 transitions. [2018-12-03 16:17:30,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 16:17:30,101 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2018-12-03 16:17:30,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:17:30,105 INFO L225 Difference]: With dead ends: 5039 [2018-12-03 16:17:30,106 INFO L226 Difference]: Without dead ends: 5037 [2018-12-03 16:17:30,107 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=331, Invalid=1925, Unknown=0, NotChecked=0, Total=2256 [2018-12-03 16:17:30,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5037 states. [2018-12-03 16:17:33,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5037 to 4736. [2018-12-03 16:17:33,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4736 states. [2018-12-03 16:17:33,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4736 states to 4736 states and 7311 transitions. [2018-12-03 16:17:33,326 INFO L78 Accepts]: Start accepts. Automaton has 4736 states and 7311 transitions. Word has length 32 [2018-12-03 16:17:33,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:17:33,327 INFO L480 AbstractCegarLoop]: Abstraction has 4736 states and 7311 transitions. [2018-12-03 16:17:33,327 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 16:17:33,327 INFO L276 IsEmpty]: Start isEmpty. Operand 4736 states and 7311 transitions. [2018-12-03 16:17:33,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-12-03 16:17:33,330 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:17:33,330 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:17:33,330 INFO L423 AbstractCegarLoop]: === Iteration 87 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:17:33,331 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:17:33,331 INFO L82 PathProgramCache]: Analyzing trace with hash -1043085211, now seen corresponding path program 3 times [2018-12-03 16:17:33,331 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:17:33,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:17:33,331 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:17:33,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:17:33,332 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:17:33,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:17:33,403 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:17:33,404 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:17:33,404 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:17:33,404 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:17:33,404 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:17:33,404 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:17:33,405 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 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:17:33,414 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:17:33,414 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:17:33,423 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:17:33,424 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:17:33,425 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:17:33,525 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-03 16:17:33,525 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:17:33,605 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 13 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-03 16:17:33,626 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:17:33,626 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 19 [2018-12-03 16:17:33,626 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:17:33,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 16:17:33,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 16:17:33,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=270, Unknown=0, NotChecked=0, Total=342 [2018-12-03 16:17:33,627 INFO L87 Difference]: Start difference. First operand 4736 states and 7311 transitions. Second operand 14 states. [2018-12-03 16:17:41,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:17:41,883 INFO L93 Difference]: Finished difference Result 13066 states and 20005 transitions. [2018-12-03 16:17:41,883 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-12-03 16:17:41,883 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2018-12-03 16:17:41,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:17:41,890 INFO L225 Difference]: With dead ends: 13066 [2018-12-03 16:17:41,890 INFO L226 Difference]: Without dead ends: 8107 [2018-12-03 16:17:41,896 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1830 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1272, Invalid=4734, Unknown=0, NotChecked=0, Total=6006 [2018-12-03 16:17:41,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8107 states. [2018-12-03 16:17:46,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8107 to 6666. [2018-12-03 16:17:46,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6666 states. [2018-12-03 16:17:46,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6666 states to 6666 states and 9989 transitions. [2018-12-03 16:17:46,319 INFO L78 Accepts]: Start accepts. Automaton has 6666 states and 9989 transitions. Word has length 35 [2018-12-03 16:17:46,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:17:46,320 INFO L480 AbstractCegarLoop]: Abstraction has 6666 states and 9989 transitions. [2018-12-03 16:17:46,320 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 16:17:46,320 INFO L276 IsEmpty]: Start isEmpty. Operand 6666 states and 9989 transitions. [2018-12-03 16:17:46,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-12-03 16:17:46,323 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:17:46,323 INFO L402 BasicCegarLoop]: trace histogram [6, 5, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1] [2018-12-03 16:17:46,324 INFO L423 AbstractCegarLoop]: === Iteration 88 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:17:46,324 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:17:46,324 INFO L82 PathProgramCache]: Analyzing trace with hash 2078214942, now seen corresponding path program 2 times [2018-12-03 16:17:46,324 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:17:46,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:17:46,324 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:17:46,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:17:46,325 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:17:46,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:17:46,528 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 57 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:17:46,529 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:17:46,529 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:17:46,529 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:17:46,529 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:17:46,529 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:17:46,530 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 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:17:46,538 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:17:46,538 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:17:46,552 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-03 16:17:46,552 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:17:46,553 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:17:46,788 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 3 proven. 57 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 16:17:46,789 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:17:47,033 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 3 proven. 57 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 16:17:47,052 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:17:47,052 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 12, 12] total 39 [2018-12-03 16:17:47,052 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:17:47,052 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 16:17:47,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 16:17:47,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1414, Unknown=0, NotChecked=0, Total=1560 [2018-12-03 16:17:47,053 INFO L87 Difference]: Start difference. First operand 6666 states and 9989 transitions. Second operand 29 states. [2018-12-03 16:18:05,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:18:05,543 INFO L93 Difference]: Finished difference Result 9823 states and 14704 transitions. [2018-12-03 16:18:05,543 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2018-12-03 16:18:05,543 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 37 [2018-12-03 16:18:05,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:18:05,551 INFO L225 Difference]: With dead ends: 9823 [2018-12-03 16:18:05,552 INFO L226 Difference]: Without dead ends: 9706 [2018-12-03 16:18:05,554 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4930 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3272, Invalid=14550, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 16:18:05,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9706 states. [2018-12-03 16:18:10,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9706 to 7062. [2018-12-03 16:18:10,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7062 states. [2018-12-03 16:18:10,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7062 states to 7062 states and 10570 transitions. [2018-12-03 16:18:10,715 INFO L78 Accepts]: Start accepts. Automaton has 7062 states and 10570 transitions. Word has length 37 [2018-12-03 16:18:10,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:18:10,715 INFO L480 AbstractCegarLoop]: Abstraction has 7062 states and 10570 transitions. [2018-12-03 16:18:10,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 16:18:10,715 INFO L276 IsEmpty]: Start isEmpty. Operand 7062 states and 10570 transitions. [2018-12-03 16:18:10,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 16:18:10,720 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:18:10,720 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:18:10,720 INFO L423 AbstractCegarLoop]: === Iteration 89 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:18:10,720 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:18:10,720 INFO L82 PathProgramCache]: Analyzing trace with hash -1371904424, now seen corresponding path program 4 times [2018-12-03 16:18:10,720 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:18:10,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:18:10,721 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:18:10,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:18:10,721 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:18:10,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:18:10,863 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 5 proven. 33 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-12-03 16:18:10,864 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:18:10,864 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:18:10,864 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:18:10,864 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:18:10,864 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:18:10,864 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 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:18:10,873 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:18:10,874 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:18:10,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:18:10,886 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:18:11,068 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 14 proven. 7 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-03 16:18:11,069 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:18:11,202 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 16 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-03 16:18:11,222 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:18:11,222 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 9] total 27 [2018-12-03 16:18:11,222 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:18:11,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 16:18:11,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 16:18:11,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=614, Unknown=0, NotChecked=0, Total=702 [2018-12-03 16:18:11,223 INFO L87 Difference]: Start difference. First operand 7062 states and 10570 transitions. Second operand 22 states. [2018-12-03 16:18:22,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:18:22,894 INFO L93 Difference]: Finished difference Result 15751 states and 23579 transitions. [2018-12-03 16:18:22,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 16:18:22,894 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 38 [2018-12-03 16:18:22,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:18:22,904 INFO L225 Difference]: With dead ends: 15751 [2018-12-03 16:18:22,904 INFO L226 Difference]: Without dead ends: 10208 [2018-12-03 16:18:22,910 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1723 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=867, Invalid=5613, Unknown=0, NotChecked=0, Total=6480 [2018-12-03 16:18:22,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10208 states. [2018-12-03 16:18:28,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10208 to 7155. [2018-12-03 16:18:28,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7155 states. [2018-12-03 16:18:28,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7155 states to 7155 states and 10708 transitions. [2018-12-03 16:18:28,296 INFO L78 Accepts]: Start accepts. Automaton has 7155 states and 10708 transitions. Word has length 38 [2018-12-03 16:18:28,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:18:28,296 INFO L480 AbstractCegarLoop]: Abstraction has 7155 states and 10708 transitions. [2018-12-03 16:18:28,297 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 16:18:28,297 INFO L276 IsEmpty]: Start isEmpty. Operand 7155 states and 10708 transitions. [2018-12-03 16:18:28,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 16:18:28,301 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:18:28,301 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:18:28,301 INFO L423 AbstractCegarLoop]: === Iteration 90 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:18:28,302 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:18:28,302 INFO L82 PathProgramCache]: Analyzing trace with hash -1029120164, now seen corresponding path program 1 times [2018-12-03 16:18:28,302 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:18:28,302 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:18:28,302 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:18:28,302 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:18:28,303 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:18:28,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:18:28,514 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 3 proven. 29 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-12-03 16:18:28,514 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:18:28,514 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:18:28,514 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 39 with the following transitions: [2018-12-03 16:18:28,515 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [21], [22], [25], [27], [38], [41], [45], [47], [50], [56], [58], [61], [63], [65], [67], [70], [72] [2018-12-03 16:18:28,515 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:18:28,516 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:18:28,531 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:18:28,532 INFO L272 AbstractInterpreter]: Visited 23 different actions 61 times. Merged at 19 different actions 27 times. Widened at 1 different actions 1 times. Found 18 fixpoints after 10 different actions. Largest state had 0 variables. [2018-12-03 16:18:28,568 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:18:28,568 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:18:28,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:18:28,568 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 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:18:28,585 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:18:28,585 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:18:28,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:18:28,610 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:18:28,855 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-03 16:18:28,855 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:18:28,986 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-03 16:18:29,004 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:18:29,005 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 9] total 27 [2018-12-03 16:18:29,005 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:18:29,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 16:18:29,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 16:18:29,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=618, Unknown=0, NotChecked=0, Total=702 [2018-12-03 16:18:29,005 INFO L87 Difference]: Start difference. First operand 7155 states and 10708 transitions. Second operand 22 states. [2018-12-03 16:18:40,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:18:40,366 INFO L93 Difference]: Finished difference Result 15735 states and 23603 transitions. [2018-12-03 16:18:40,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 16:18:40,366 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 38 [2018-12-03 16:18:40,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:18:40,375 INFO L225 Difference]: With dead ends: 15735 [2018-12-03 16:18:40,375 INFO L226 Difference]: Without dead ends: 10029 [2018-12-03 16:18:40,381 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1961 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=854, Invalid=6286, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 16:18:40,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10029 states. [2018-12-03 16:18:46,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10029 to 7999. [2018-12-03 16:18:46,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7999 states. [2018-12-03 16:18:46,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7999 states to 7999 states and 12001 transitions. [2018-12-03 16:18:46,230 INFO L78 Accepts]: Start accepts. Automaton has 7999 states and 12001 transitions. Word has length 38 [2018-12-03 16:18:46,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:18:46,231 INFO L480 AbstractCegarLoop]: Abstraction has 7999 states and 12001 transitions. [2018-12-03 16:18:46,231 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 16:18:46,231 INFO L276 IsEmpty]: Start isEmpty. Operand 7999 states and 12001 transitions. [2018-12-03 16:18:46,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-12-03 16:18:46,236 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:18:46,236 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2018-12-03 16:18:46,236 INFO L423 AbstractCegarLoop]: === Iteration 91 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:18:46,236 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:18:46,237 INFO L82 PathProgramCache]: Analyzing trace with hash -1224067412, now seen corresponding path program 2 times [2018-12-03 16:18:46,237 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:18:46,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:18:46,237 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:18:46,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:18:46,238 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:18:46,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:18:46,448 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 6 proven. 76 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:18:46,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:18:46,449 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:18:46,449 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:18:46,449 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:18:46,449 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:18:46,449 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 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:18:46,460 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:18:46,460 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:18:46,471 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 16:18:46,471 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:18:46,473 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:18:47,082 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 1 proven. 69 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-03 16:18:47,082 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:18:47,391 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 9 proven. 61 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-03 16:18:47,410 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:18:47,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 11, 11] total 36 [2018-12-03 16:18:47,410 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:18:47,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 16:18:47,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 16:18:47,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1201, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 16:18:47,411 INFO L87 Difference]: Start difference. First operand 7999 states and 12001 transitions. Second operand 27 states. [2018-12-03 16:18:56,652 WARN L180 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 35 [2018-12-03 16:18:58,428 WARN L180 SmtUtils]: Spent 291.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2018-12-03 16:19:03,263 WARN L180 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2018-12-03 16:19:03,788 WARN L180 SmtUtils]: Spent 342.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 32 [2018-12-03 16:19:04,824 WARN L180 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2018-12-03 16:19:05,691 WARN L180 SmtUtils]: Spent 305.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 33 [2018-12-03 16:19:06,216 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 35 [2018-12-03 16:19:07,136 WARN L180 SmtUtils]: Spent 401.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2018-12-03 16:19:08,180 WARN L180 SmtUtils]: Spent 611.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 35 [2018-12-03 16:19:09,902 WARN L180 SmtUtils]: Spent 404.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2018-12-03 16:19:12,751 WARN L180 SmtUtils]: Spent 309.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2018-12-03 16:19:15,684 WARN L180 SmtUtils]: Spent 571.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 31 [2018-12-03 16:19:16,116 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 34 [2018-12-03 16:19:17,517 WARN L180 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 33 [2018-12-03 16:19:17,665 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2018-12-03 16:19:17,883 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 35 [2018-12-03 16:19:19,234 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 36 [2018-12-03 16:19:21,110 WARN L180 SmtUtils]: Spent 349.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 42 [2018-12-03 16:19:22,223 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2018-12-03 16:19:22,669 WARN L180 SmtUtils]: Spent 331.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 44 [2018-12-03 16:19:23,221 WARN L180 SmtUtils]: Spent 305.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 42 [2018-12-03 16:19:25,784 WARN L180 SmtUtils]: Spent 568.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 32 [2018-12-03 16:19:26,760 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 27 [2018-12-03 16:19:28,307 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2018-12-03 16:19:28,665 WARN L180 SmtUtils]: Spent 330.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 30 [2018-12-03 16:19:30,982 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2018-12-03 16:19:33,001 WARN L180 SmtUtils]: Spent 485.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 38 [2018-12-03 16:19:35,554 WARN L180 SmtUtils]: Spent 609.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 30 [2018-12-03 16:19:37,162 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2018-12-03 16:19:37,549 WARN L180 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2018-12-03 16:19:38,405 WARN L180 SmtUtils]: Spent 313.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2018-12-03 16:19:42,555 WARN L180 SmtUtils]: Spent 305.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2018-12-03 16:19:46,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:19:46,781 INFO L93 Difference]: Finished difference Result 13389 states and 20162 transitions. [2018-12-03 16:19:46,782 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 215 states. [2018-12-03 16:19:46,782 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 40 [2018-12-03 16:19:46,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:19:46,795 INFO L225 Difference]: With dead ends: 13389 [2018-12-03 16:19:46,795 INFO L226 Difference]: Without dead ends: 13387 [2018-12-03 16:19:46,800 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20496 ImplicationChecksByTransitivity, 23.3s TimeCoverageRelationStatistics Valid=7306, Invalid=51494, Unknown=6, NotChecked=0, Total=58806 [2018-12-03 16:19:46,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13387 states. [2018-12-03 16:19:52,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13387 to 8253. [2018-12-03 16:19:52,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8253 states. [2018-12-03 16:19:52,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8253 states to 8253 states and 12418 transitions. [2018-12-03 16:19:52,985 INFO L78 Accepts]: Start accepts. Automaton has 8253 states and 12418 transitions. Word has length 40 [2018-12-03 16:19:52,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:19:52,985 INFO L480 AbstractCegarLoop]: Abstraction has 8253 states and 12418 transitions. [2018-12-03 16:19:52,985 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 16:19:52,985 INFO L276 IsEmpty]: Start isEmpty. Operand 8253 states and 12418 transitions. [2018-12-03 16:19:52,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 16:19:52,990 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:19:52,991 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1] [2018-12-03 16:19:52,991 INFO L423 AbstractCegarLoop]: === Iteration 92 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:19:52,991 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:19:52,991 INFO L82 PathProgramCache]: Analyzing trace with hash -789014831, now seen corresponding path program 3 times [2018-12-03 16:19:52,991 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:19:52,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:19:52,992 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:19:52,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:19:52,992 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:19:52,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:19:53,253 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 12 proven. 77 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 16:19:53,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:19:53,253 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:19:53,253 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:19:53,254 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:19:53,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:19:53,254 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 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:19:53,261 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:19:53,262 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:19:53,275 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:19:53,275 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:19:53,276 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:19:53,410 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 45 proven. 28 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-12-03 16:19:53,410 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:19:53,534 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 51 proven. 22 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-12-03 16:19:53,552 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:19:53,552 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 9, 9] total 31 [2018-12-03 16:19:53,552 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:19:53,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-12-03 16:19:53,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-12-03 16:19:53,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=836, Unknown=0, NotChecked=0, Total=930 [2018-12-03 16:19:53,553 INFO L87 Difference]: Start difference. First operand 8253 states and 12418 transitions. Second operand 28 states. [2018-12-03 16:20:14,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:20:14,091 INFO L93 Difference]: Finished difference Result 22866 states and 34563 transitions. [2018-12-03 16:20:14,091 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2018-12-03 16:20:14,092 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 42 [2018-12-03 16:20:14,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:20:14,104 INFO L225 Difference]: With dead ends: 22866 [2018-12-03 16:20:14,104 INFO L226 Difference]: Without dead ends: 16060 [2018-12-03 16:20:14,110 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 72 SyntacticMatches, 4 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8307 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=3391, Invalid=21415, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 16:20:14,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16060 states. [2018-12-03 16:20:22,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16060 to 13797. [2018-12-03 16:20:22,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13797 states. [2018-12-03 16:20:22,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13797 states to 13797 states and 20617 transitions. [2018-12-03 16:20:22,936 INFO L78 Accepts]: Start accepts. Automaton has 13797 states and 20617 transitions. Word has length 42 [2018-12-03 16:20:22,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:20:22,936 INFO L480 AbstractCegarLoop]: Abstraction has 13797 states and 20617 transitions. [2018-12-03 16:20:22,936 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-12-03 16:20:22,936 INFO L276 IsEmpty]: Start isEmpty. Operand 13797 states and 20617 transitions. [2018-12-03 16:20:22,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 16:20:22,944 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:20:22,944 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:20:22,944 INFO L423 AbstractCegarLoop]: === Iteration 93 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:20:22,944 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:20:22,944 INFO L82 PathProgramCache]: Analyzing trace with hash -483072842, now seen corresponding path program 1 times [2018-12-03 16:20:22,945 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:20:22,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:20:22,945 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:20:22,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:20:22,946 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:20:22,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:20:23,145 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 8 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:20:23,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:20:23,145 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:20:23,146 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 43 with the following transitions: [2018-12-03 16:20:23,146 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [25], [27], [29], [32], [38], [41], [65], [66], [67], [70], [72] [2018-12-03 16:20:23,146 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:20:23,146 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:20:23,158 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:20:23,158 INFO L272 AbstractInterpreter]: Visited 18 different actions 49 times. Merged at 15 different actions 24 times. Widened at 1 different actions 1 times. Found 12 fixpoints after 6 different actions. Largest state had 0 variables. [2018-12-03 16:20:23,195 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:20:23,195 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:20:23,195 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:20:23,195 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 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:20:23,212 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:20:23,212 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:20:23,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:20:23,227 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:20:23,367 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 13 proven. 74 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 16:20:23,367 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:20:23,638 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 9 proven. 78 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 16:20:23,657 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:20:23,657 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 12, 12] total 36 [2018-12-03 16:20:23,657 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:20:23,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 16:20:23,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 16:20:23,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1192, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 16:20:23,658 INFO L87 Difference]: Start difference. First operand 13797 states and 20617 transitions. Second operand 26 states. [2018-12-03 16:20:34,623 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 27 [2018-12-03 16:20:58,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:20:58,520 INFO L93 Difference]: Finished difference Result 21219 states and 31561 transitions. [2018-12-03 16:20:58,520 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 157 states. [2018-12-03 16:20:58,520 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 42 [2018-12-03 16:20:58,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:20:58,537 INFO L225 Difference]: With dead ends: 21219 [2018-12-03 16:20:58,537 INFO L226 Difference]: Without dead ends: 21217 [2018-12-03 16:20:58,541 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11995 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=7192, Invalid=27590, Unknown=0, NotChecked=0, Total=34782 [2018-12-03 16:20:58,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21217 states. [2018-12-03 16:21:09,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21217 to 14305. [2018-12-03 16:21:09,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14305 states. [2018-12-03 16:21:09,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14305 states to 14305 states and 21398 transitions. [2018-12-03 16:21:09,218 INFO L78 Accepts]: Start accepts. Automaton has 14305 states and 21398 transitions. Word has length 42 [2018-12-03 16:21:09,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:21:09,219 INFO L480 AbstractCegarLoop]: Abstraction has 14305 states and 21398 transitions. [2018-12-03 16:21:09,219 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 16:21:09,219 INFO L276 IsEmpty]: Start isEmpty. Operand 14305 states and 21398 transitions. [2018-12-03 16:21:09,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 16:21:09,226 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:21:09,226 INFO L402 BasicCegarLoop]: trace histogram [6, 5, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:21:09,226 INFO L423 AbstractCegarLoop]: === Iteration 94 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:21:09,227 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:21:09,227 INFO L82 PathProgramCache]: Analyzing trace with hash 1371594221, now seen corresponding path program 1 times [2018-12-03 16:21:09,227 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:21:09,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:21:09,227 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:21:09,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:21:09,228 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:21:09,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:21:09,385 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 59 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 16:21:09,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:21:09,386 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:21:09,386 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 43 with the following transitions: [2018-12-03 16:21:09,386 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [11], [14], [20], [22], [25], [27], [29], [32], [38], [41], [56], [57], [58], [61], [63], [65], [67], [70], [72] [2018-12-03 16:21:09,387 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:21:09,387 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:21:09,398 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:21:09,398 INFO L272 AbstractInterpreter]: Visited 22 different actions 59 times. Merged at 18 different actions 26 times. Widened at 1 different actions 1 times. Found 18 fixpoints after 10 different actions. Largest state had 0 variables. [2018-12-03 16:21:09,404 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:21:09,405 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:21:09,405 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:21:09,405 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 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:21:09,415 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:21:09,415 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:21:09,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:21:09,427 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:21:09,576 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 12 proven. 49 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 16:21:09,577 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:21:09,773 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 7 proven. 54 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 16:21:09,792 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:21:09,792 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 30 [2018-12-03 16:21:09,792 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:21:09,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 16:21:09,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 16:21:09,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=814, Unknown=0, NotChecked=0, Total=930 [2018-12-03 16:21:09,793 INFO L87 Difference]: Start difference. First operand 14305 states and 21398 transitions. Second operand 20 states. [2018-12-03 16:21:45,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:21:45,255 INFO L93 Difference]: Finished difference Result 35597 states and 53521 transitions. [2018-12-03 16:21:45,255 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2018-12-03 16:21:45,255 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2018-12-03 16:21:45,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:21:45,290 INFO L225 Difference]: With dead ends: 35597 [2018-12-03 16:21:45,290 INFO L226 Difference]: Without dead ends: 35595 [2018-12-03 16:21:45,296 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5785 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=2914, Invalid=15992, Unknown=0, NotChecked=0, Total=18906 [2018-12-03 16:21:45,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35595 states. [2018-12-03 16:21:58,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35595 to 16616. [2018-12-03 16:21:58,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16616 states. [2018-12-03 16:21:58,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16616 states to 16616 states and 24984 transitions. [2018-12-03 16:21:58,198 INFO L78 Accepts]: Start accepts. Automaton has 16616 states and 24984 transitions. Word has length 42 [2018-12-03 16:21:58,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:21:58,198 INFO L480 AbstractCegarLoop]: Abstraction has 16616 states and 24984 transitions. [2018-12-03 16:21:58,198 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 16:21:58,198 INFO L276 IsEmpty]: Start isEmpty. Operand 16616 states and 24984 transitions. [2018-12-03 16:21:58,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-12-03 16:21:58,204 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:21:58,204 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:21:58,204 INFO L423 AbstractCegarLoop]: === Iteration 95 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:21:58,204 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:21:58,204 INFO L82 PathProgramCache]: Analyzing trace with hash -937555222, now seen corresponding path program 2 times [2018-12-03 16:21:58,204 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:21:58,205 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:21:58,205 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:21:58,205 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:21:58,205 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:21:58,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:21:58,358 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 2 proven. 40 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-12-03 16:21:58,359 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:21:58,359 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:21:58,359 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:21:58,359 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:21:58,359 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:21:58,359 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 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:21:58,369 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:21:58,369 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:21:58,384 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 16:21:58,384 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:21:58,385 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:21:58,714 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 17 proven. 22 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-03 16:21:58,714 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:21:58,908 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 1 proven. 38 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-03 16:21:58,927 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:21:58,927 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 11] total 33 [2018-12-03 16:21:58,927 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:21:58,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-03 16:21:58,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-03 16:21:58,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1000, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 16:21:58,928 INFO L87 Difference]: Start difference. First operand 16616 states and 24984 transitions. Second operand 24 states. [2018-12-03 16:22:30,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:22:30,520 INFO L93 Difference]: Finished difference Result 29385 states and 44369 transitions. [2018-12-03 16:22:30,521 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2018-12-03 16:22:30,521 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 43 [2018-12-03 16:22:30,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:22:30,548 INFO L225 Difference]: With dead ends: 29385 [2018-12-03 16:22:30,549 INFO L226 Difference]: Without dead ends: 29383 [2018-12-03 16:22:30,554 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3457 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1797, Invalid=11085, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 16:22:30,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29383 states. [2018-12-03 16:22:44,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29383 to 18384. [2018-12-03 16:22:44,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18384 states. [2018-12-03 16:22:44,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18384 states to 18384 states and 27655 transitions. [2018-12-03 16:22:44,503 INFO L78 Accepts]: Start accepts. Automaton has 18384 states and 27655 transitions. Word has length 43 [2018-12-03 16:22:44,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:22:44,503 INFO L480 AbstractCegarLoop]: Abstraction has 18384 states and 27655 transitions. [2018-12-03 16:22:44,503 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-03 16:22:44,503 INFO L276 IsEmpty]: Start isEmpty. Operand 18384 states and 27655 transitions. [2018-12-03 16:22:44,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-12-03 16:22:44,510 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:22:44,510 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 6, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1] [2018-12-03 16:22:44,510 INFO L423 AbstractCegarLoop]: === Iteration 96 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:22:44,510 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:22:44,511 INFO L82 PathProgramCache]: Analyzing trace with hash -640486478, now seen corresponding path program 5 times [2018-12-03 16:22:44,511 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:22:44,511 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:22:44,511 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:22:44,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:22:44,512 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:22:44,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:22:44,820 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 2 proven. 142 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-12-03 16:22:44,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:22:44,821 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:22:44,821 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:22:44,821 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:22:44,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:22:44,821 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 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:22:44,829 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:22:44,829 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:22:44,845 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-12-03 16:22:44,845 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:22:44,846 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:22:45,074 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 99 proven. 23 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-12-03 16:22:45,075 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:22:45,479 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 87 proven. 35 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-12-03 16:22:45,498 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:22:45,498 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 11] total 28 [2018-12-03 16:22:45,498 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:22:45,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-03 16:22:45,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-03 16:22:45,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=725, Unknown=0, NotChecked=0, Total=812 [2018-12-03 16:22:45,499 INFO L87 Difference]: Start difference. First operand 18384 states and 27655 transitions. Second operand 25 states. [2018-12-03 16:23:31,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:23:31,231 INFO L93 Difference]: Finished difference Result 34013 states and 51363 transitions. [2018-12-03 16:23:31,231 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 210 states. [2018-12-03 16:23:31,231 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 46 [2018-12-03 16:23:31,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:23:31,265 INFO L225 Difference]: With dead ends: 34013 [2018-12-03 16:23:31,265 INFO L226 Difference]: Without dead ends: 34011 [2018-12-03 16:23:31,273 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 142 SyntacticMatches, 7 SemanticMatches, 229 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20053 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=5525, Invalid=47605, Unknown=0, NotChecked=0, Total=53130 [2018-12-03 16:23:31,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34011 states. [2018-12-03 16:23:42,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34011 to 10570. [2018-12-03 16:23:42,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10570 states. [2018-12-03 16:23:42,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10570 states to 10570 states and 15748 transitions. [2018-12-03 16:23:42,260 INFO L78 Accepts]: Start accepts. Automaton has 10570 states and 15748 transitions. Word has length 46 [2018-12-03 16:23:42,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:23:42,260 INFO L480 AbstractCegarLoop]: Abstraction has 10570 states and 15748 transitions. [2018-12-03 16:23:42,260 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-03 16:23:42,260 INFO L276 IsEmpty]: Start isEmpty. Operand 10570 states and 15748 transitions. [2018-12-03 16:23:42,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-12-03 16:23:42,266 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:23:42,266 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:23:42,266 INFO L423 AbstractCegarLoop]: === Iteration 97 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:23:42,267 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:23:42,267 INFO L82 PathProgramCache]: Analyzing trace with hash 1516949158, now seen corresponding path program 3 times [2018-12-03 16:23:42,267 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:23:42,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:23:42,267 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:23:42,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:23:42,268 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:23:42,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:23:42,669 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 3 proven. 58 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-12-03 16:23:42,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:23:42,669 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:23:42,670 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:23:42,670 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:23:42,670 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:23:42,670 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 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:23:42,679 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:23:42,679 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:23:42,691 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:23:42,692 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:23:42,693 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:23:42,885 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 34 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-12-03 16:23:42,885 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:23:43,034 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 35 proven. 4 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-12-03 16:23:43,052 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:23:43,052 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10, 9] total 28 [2018-12-03 16:23:43,052 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:23:43,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 16:23:43,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 16:23:43,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2018-12-03 16:23:43,053 INFO L87 Difference]: Start difference. First operand 10570 states and 15748 transitions. Second operand 23 states. [2018-12-03 16:24:11,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:24:11,014 INFO L93 Difference]: Finished difference Result 26824 states and 39857 transitions. [2018-12-03 16:24:11,014 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2018-12-03 16:24:11,014 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 49 [2018-12-03 16:24:11,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:24:11,028 INFO L225 Difference]: With dead ends: 26824 [2018-12-03 16:24:11,029 INFO L226 Difference]: Without dead ends: 17110 [2018-12-03 16:24:11,037 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 5380 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=2049, Invalid=14721, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 16:24:11,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17110 states. [2018-12-03 16:24:22,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17110 to 11026. [2018-12-03 16:24:22,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11026 states. [2018-12-03 16:24:22,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11026 states to 11026 states and 16504 transitions. [2018-12-03 16:24:22,593 INFO L78 Accepts]: Start accepts. Automaton has 11026 states and 16504 transitions. Word has length 49 [2018-12-03 16:24:22,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:24:22,593 INFO L480 AbstractCegarLoop]: Abstraction has 11026 states and 16504 transitions. [2018-12-03 16:24:22,593 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 16:24:22,593 INFO L276 IsEmpty]: Start isEmpty. Operand 11026 states and 16504 transitions. [2018-12-03 16:24:22,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-12-03 16:24:22,598 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:24:22,598 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1] [2018-12-03 16:24:22,599 INFO L423 AbstractCegarLoop]: === Iteration 98 === [productErr2ASSERT_VIOLATIONASSERT, productErr3ASSERT_VIOLATIONASSERT, productErr0ASSERT_VIOLATIONASSERT, productErr1ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:24:22,599 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:24:22,599 INFO L82 PathProgramCache]: Analyzing trace with hash 1086529259, now seen corresponding path program 5 times [2018-12-03 16:24:22,599 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:24:22,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:24:22,600 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:24:22,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:24:22,600 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:24:22,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:24:22,857 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 138 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-12-03 16:24:22,857 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:24:22,858 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:24:22,858 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:24:22,858 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:24:22,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:24:22,858 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 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:24:22,870 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:24:22,871 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:24:22,903 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-12-03 16:24:22,904 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:24:22,905 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:24:23,302 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 13 proven. 132 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-12-03 16:24:23,302 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:24:23,730 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 25 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-12-03 16:24:23,749 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:24:23,749 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 15] total 45 [2018-12-03 16:24:23,749 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:24:23,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 16:24:23,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 16:24:23,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1862, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 16:24:23,750 INFO L87 Difference]: Start difference. First operand 11026 states and 16504 transitions. Second operand 32 states. [2018-12-03 16:24:43,035 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 63 [2018-12-03 16:24:48,081 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 63 [2018-12-03 16:24:48,330 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 65 [2018-12-03 16:24:53,281 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 57 [2018-12-03 16:25:20,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:25:20,418 INFO L93 Difference]: Finished difference Result 25461 states and 38736 transitions. [2018-12-03 16:25:20,419 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2018-12-03 16:25:20,419 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 49 [2018-12-03 16:25:20,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:25:20,443 INFO L225 Difference]: With dead ends: 25461 [2018-12-03 16:25:20,443 INFO L226 Difference]: Without dead ends: 25460 [2018-12-03 16:25:20,448 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5269 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=6610, Invalid=20122, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 16:25:20,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25460 states.