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_oct_cong.epf -i ../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/LexIndexValue-Pointer-Reduced.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 18:14:38,615 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 18:14:38,617 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 18:14:38,632 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 18:14:38,633 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 18:14:38,635 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 18:14:38,636 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 18:14:38,639 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 18:14:38,648 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 18:14:38,649 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 18:14:38,653 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-12-03 18:14:38,686 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_oct_cong.epf [2018-12-03 18:14:38,699 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 18:14:38,699 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 18:14:38,700 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 18:14:38,700 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 18:14:38,701 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 18:14:38,701 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 18:14:38,701 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 18:14:38,701 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 18:14:38,701 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 18:14:38,702 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 18:14:38,702 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 18:14:38,702 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 18:14:38,702 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 18:14:38,703 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 18:14:38,703 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 18:14:38,703 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 18:14:38,704 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 18:14:38,704 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 18:14:38,704 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 18:14:38,704 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 18:14:38,704 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 18:14:38,705 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 18:14:38,705 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 18:14:38,705 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 18:14:38,705 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 18:14:38,705 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 18:14:38,706 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 18:14:38,706 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 18:14:38,706 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 18:14:38,706 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 18:14:38,706 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 18:14:38,707 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 18:14:38,707 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 18:14:38,707 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 18:14:38,707 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 18:14:38,707 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 18:14:38,708 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 18:14:38,708 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 18:14:38,708 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 18:14:38,741 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 18:14:38,756 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 18:14:38,762 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 18:14:38,765 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 18:14:38,766 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 18:14:38,767 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/LexIndexValue-Pointer-Reduced.bpl [2018-12-03 18:14:38,767 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/LexIndexValue-Pointer-Reduced.bpl' [2018-12-03 18:14:38,817 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 18:14:38,819 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 18:14:38,823 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 18:14:38,823 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 18:14:38,823 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 18:14:38,846 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "LexIndexValue-Pointer-Reduced.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:14:38" (1/1) ... [2018-12-03 18:14:38,857 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "LexIndexValue-Pointer-Reduced.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:14:38" (1/1) ... [2018-12-03 18:14:38,867 WARN L165 Inliner]: Program contained no entry procedure! [2018-12-03 18:14:38,868 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2018-12-03 18:14:38,868 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2018-12-03 18:14:38,871 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 18:14:38,872 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 18:14:38,872 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 18:14:38,872 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 18:14:38,888 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "LexIndexValue-Pointer-Reduced.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:14:38" (1/1) ... [2018-12-03 18:14:38,888 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "LexIndexValue-Pointer-Reduced.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:14:38" (1/1) ... [2018-12-03 18:14:38,889 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "LexIndexValue-Pointer-Reduced.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:14:38" (1/1) ... [2018-12-03 18:14:38,889 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "LexIndexValue-Pointer-Reduced.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:14:38" (1/1) ... [2018-12-03 18:14:38,892 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "LexIndexValue-Pointer-Reduced.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:14:38" (1/1) ... [2018-12-03 18:14:38,898 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "LexIndexValue-Pointer-Reduced.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:14:38" (1/1) ... [2018-12-03 18:14:38,900 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "LexIndexValue-Pointer-Reduced.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:14:38" (1/1) ... [2018-12-03 18:14:38,901 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 18:14:38,902 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 18:14:38,902 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 18:14:38,902 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 18:14:38,905 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "LexIndexValue-Pointer-Reduced.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:14:38" (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 18:14:38,982 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-03 18:14:38,982 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-03 18:14:39,171 INFO L272 CfgBuilder]: Using library mode [2018-12-03 18:14:39,172 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-03 18:14:39,172 INFO L202 PluginConnector]: Adding new model LexIndexValue-Pointer-Reduced.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 06:14:39 BoogieIcfgContainer [2018-12-03 18:14:39,172 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 18:14:39,173 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 18:14:39,174 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 18:14:39,177 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 18:14:39,177 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "LexIndexValue-Pointer-Reduced.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:14:38" (1/2) ... [2018-12-03 18:14:39,178 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a558097 and model type LexIndexValue-Pointer-Reduced.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 06:14:39, skipping insertion in model container [2018-12-03 18:14:39,179 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "LexIndexValue-Pointer-Reduced.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 06:14:39" (2/2) ... [2018-12-03 18:14:39,181 INFO L112 eAbstractionObserver]: Analyzing ICFG LexIndexValue-Pointer-Reduced.bpl [2018-12-03 18:14:39,191 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 18:14:39,200 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 18:14:39,219 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 18:14:39,262 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 18:14:39,262 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 18:14:39,263 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 18:14:39,263 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 18:14:39,263 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 18:14:39,263 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 18:14:39,263 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 18:14:39,263 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 18:14:39,287 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-12-03 18:14:39,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-12-03 18:14:39,304 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:39,306 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-12-03 18:14:39,314 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:39,324 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:39,325 INFO L82 PathProgramCache]: Analyzing trace with hash 29920, now seen corresponding path program 1 times [2018-12-03 18:14:39,327 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:39,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:39,378 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:39,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:39,378 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:39,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:39,467 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 18:14:39,470 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 18:14:39,470 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2018-12-03 18:14:39,470 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 18:14:39,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 18:14:39,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 18:14:39,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 18:14:39,493 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-12-03 18:14:39,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:39,581 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-12-03 18:14:39,582 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 18:14:39,584 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-12-03 18:14:39,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:39,597 INFO L225 Difference]: With dead ends: 11 [2018-12-03 18:14:39,598 INFO L226 Difference]: Without dead ends: 6 [2018-12-03 18:14:39,602 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 18:14:39,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2018-12-03 18:14:39,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2018-12-03 18:14:39,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2018-12-03 18:14:39,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2018-12-03 18:14:39,674 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 3 [2018-12-03 18:14:39,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:39,675 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2018-12-03 18:14:39,675 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 18:14:39,675 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2018-12-03 18:14:39,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-03 18:14:39,676 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:39,676 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2018-12-03 18:14:39,677 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:39,677 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:39,677 INFO L82 PathProgramCache]: Analyzing trace with hash 28754210, now seen corresponding path program 1 times [2018-12-03 18:14:39,678 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:39,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:39,679 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:39,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:39,680 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:39,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:39,772 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 18:14:39,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:39,773 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:39,774 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 6 with the following transitions: [2018-12-03 18:14:39,776 INFO L205 CegarAbsIntRunner]: [0], [4], [5], [6] [2018-12-03 18:14:39,855 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 18:14:39,856 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 18:14:40,120 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 18:14:40,122 INFO L272 AbstractInterpreter]: Visited 4 different actions 28 times. Merged at 2 different actions 16 times. Widened at 1 different actions 4 times. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 18:14:40,135 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:40,136 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 18:14:40,136 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:40,137 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 18:14:40,155 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:40,155 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:14:40,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:40,183 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:40,289 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 18:14:40,290 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:40,342 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 18:14:40,362 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:40,363 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2018-12-03 18:14:40,363 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:40,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-03 18:14:40,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-03 18:14:40,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2018-12-03 18:14:40,364 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 6 states. [2018-12-03 18:14:40,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:40,419 INFO L93 Difference]: Finished difference Result 9 states and 9 transitions. [2018-12-03 18:14:40,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 18:14:40,420 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 5 [2018-12-03 18:14:40,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:40,421 INFO L225 Difference]: With dead ends: 9 [2018-12-03 18:14:40,421 INFO L226 Difference]: Without dead ends: 8 [2018-12-03 18:14:40,423 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2018-12-03 18:14:40,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-12-03 18:14:40,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-12-03 18:14:40,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-12-03 18:14:40,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-12-03 18:14:40,427 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 5 [2018-12-03 18:14:40,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:40,427 INFO L480 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-12-03 18:14:40,427 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-03 18:14:40,428 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-12-03 18:14:40,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-12-03 18:14:40,428 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:40,428 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 1, 1] [2018-12-03 18:14:40,429 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:40,429 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:40,429 INFO L82 PathProgramCache]: Analyzing trace with hash 1862993124, now seen corresponding path program 2 times [2018-12-03 18:14:40,429 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:40,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:40,431 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:40,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:40,431 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:40,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:40,489 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:40,489 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:40,490 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:40,490 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:40,490 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:40,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:40,491 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 18:14:40,511 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:14:40,511 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:14:40,534 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-03 18:14:40,534 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:40,535 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:40,660 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:40,660 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:40,795 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:40,814 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:40,814 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2018-12-03 18:14:40,814 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:40,815 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 18:14:40,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 18:14:40,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2018-12-03 18:14:40,817 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 8 states. [2018-12-03 18:14:40,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:40,854 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-12-03 18:14:40,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 18:14:40,856 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 7 [2018-12-03 18:14:40,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:40,856 INFO L225 Difference]: With dead ends: 11 [2018-12-03 18:14:40,857 INFO L226 Difference]: Without dead ends: 10 [2018-12-03 18:14:40,857 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2018-12-03 18:14:40,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-12-03 18:14:40,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-12-03 18:14:40,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-12-03 18:14:40,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-12-03 18:14:40,861 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 7 [2018-12-03 18:14:40,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:40,861 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-12-03 18:14:40,861 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 18:14:40,862 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-12-03 18:14:40,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-03 18:14:40,863 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:40,863 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 1, 1] [2018-12-03 18:14:40,863 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:40,863 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:40,864 INFO L82 PathProgramCache]: Analyzing trace with hash -664969178, now seen corresponding path program 3 times [2018-12-03 18:14:40,864 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:40,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:40,865 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:40,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:40,865 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:40,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:41,118 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 18:14:41,119 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:41,119 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:41,119 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:41,119 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:41,119 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:41,119 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 18:14:41,129 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:14:41,130 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:14:41,148 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:14:41,148 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:41,149 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:41,295 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 18:14:41,296 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:41,365 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 18:14:41,385 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:41,386 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2018-12-03 18:14:41,386 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:41,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-03 18:14:41,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-03 18:14:41,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=97, Unknown=0, NotChecked=0, Total=182 [2018-12-03 18:14:41,388 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 10 states. [2018-12-03 18:14:41,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:41,440 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-12-03 18:14:41,440 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 18:14:41,440 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 9 [2018-12-03 18:14:41,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:41,441 INFO L225 Difference]: With dead ends: 13 [2018-12-03 18:14:41,441 INFO L226 Difference]: Without dead ends: 12 [2018-12-03 18:14:41,442 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=85, Invalid=97, Unknown=0, NotChecked=0, Total=182 [2018-12-03 18:14:41,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-12-03 18:14:41,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-12-03 18:14:41,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-12-03 18:14:41,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-12-03 18:14:41,445 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2018-12-03 18:14:41,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:41,446 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-12-03 18:14:41,446 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-03 18:14:41,446 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-12-03 18:14:41,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-12-03 18:14:41,447 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:41,447 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 1, 1] [2018-12-03 18:14:41,447 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:41,447 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:41,448 INFO L82 PathProgramCache]: Analyzing trace with hash 914748136, now seen corresponding path program 4 times [2018-12-03 18:14:41,448 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:41,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:41,449 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:41,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:41,449 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:41,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:41,624 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:41,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:41,625 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:41,625 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:41,626 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:41,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:41,626 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 18:14:41,635 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:41,635 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:14:41,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:41,646 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:42,121 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:42,122 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:42,227 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:42,247 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:42,247 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 15 [2018-12-03 18:14:42,247 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:42,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 18:14:42,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 18:14:42,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=146, Unknown=0, NotChecked=0, Total=272 [2018-12-03 18:14:42,249 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 12 states. [2018-12-03 18:14:42,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:42,324 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-12-03 18:14:42,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 18:14:42,325 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 11 [2018-12-03 18:14:42,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:42,326 INFO L225 Difference]: With dead ends: 15 [2018-12-03 18:14:42,327 INFO L226 Difference]: Without dead ends: 14 [2018-12-03 18:14:42,328 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=126, Invalid=146, Unknown=0, NotChecked=0, Total=272 [2018-12-03 18:14:42,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-12-03 18:14:42,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-12-03 18:14:42,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-12-03 18:14:42,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-12-03 18:14:42,332 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-12-03 18:14:42,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:42,332 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-12-03 18:14:42,332 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 18:14:42,332 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-12-03 18:14:42,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 18:14:42,333 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:42,333 INFO L402 BasicCegarLoop]: trace histogram [6, 5, 1, 1] [2018-12-03 18:14:42,333 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:42,334 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:42,334 INFO L82 PathProgramCache]: Analyzing trace with hash -1395335894, now seen corresponding path program 5 times [2018-12-03 18:14:42,334 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:42,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:42,335 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:42,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:42,336 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:42,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:42,444 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:42,445 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:42,445 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:42,445 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:42,446 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:42,446 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:42,446 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:14:42,456 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:14:42,456 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:14:42,469 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-03 18:14:42,469 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:42,471 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:42,614 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:42,615 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:42,797 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:42,821 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:42,821 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 18 [2018-12-03 18:14:42,821 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:42,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 18:14:42,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 18:14:42,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=205, Unknown=0, NotChecked=0, Total=380 [2018-12-03 18:14:42,823 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 14 states. [2018-12-03 18:14:42,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:42,907 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-12-03 18:14:42,909 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 18:14:42,909 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 13 [2018-12-03 18:14:42,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:42,910 INFO L225 Difference]: With dead ends: 17 [2018-12-03 18:14:42,910 INFO L226 Difference]: Without dead ends: 16 [2018-12-03 18:14:42,911 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=175, Invalid=205, Unknown=0, NotChecked=0, Total=380 [2018-12-03 18:14:42,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-12-03 18:14:42,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-12-03 18:14:42,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-12-03 18:14:42,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-12-03 18:14:42,916 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-12-03 18:14:42,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:42,916 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-12-03 18:14:42,916 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 18:14:42,916 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-12-03 18:14:42,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-12-03 18:14:42,917 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:42,917 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 1, 1] [2018-12-03 18:14:42,917 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:42,917 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:42,917 INFO L82 PathProgramCache]: Analyzing trace with hash -887996692, now seen corresponding path program 6 times [2018-12-03 18:14:42,918 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:42,919 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:42,919 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:42,919 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:42,919 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:42,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:43,034 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:43,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:43,035 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:43,035 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:43,035 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:43,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:43,035 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 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 18:14:43,049 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:14:43,049 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:14:43,080 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:14:43,081 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:43,082 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:43,189 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:43,190 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:43,327 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:43,346 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:43,347 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 21 [2018-12-03 18:14:43,347 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:43,347 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 18:14:43,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 18:14:43,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=274, Unknown=0, NotChecked=0, Total=506 [2018-12-03 18:14:43,349 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 16 states. [2018-12-03 18:14:43,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:43,431 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-12-03 18:14:43,435 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 18:14:43,435 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 15 [2018-12-03 18:14:43,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:43,436 INFO L225 Difference]: With dead ends: 19 [2018-12-03 18:14:43,436 INFO L226 Difference]: Without dead ends: 18 [2018-12-03 18:14:43,437 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=232, Invalid=274, Unknown=0, NotChecked=0, Total=506 [2018-12-03 18:14:43,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-12-03 18:14:43,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-12-03 18:14:43,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-12-03 18:14:43,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-12-03 18:14:43,442 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-12-03 18:14:43,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:43,443 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-12-03 18:14:43,443 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 18:14:43,443 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-12-03 18:14:43,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-12-03 18:14:43,444 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:43,444 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 1, 1] [2018-12-03 18:14:43,444 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:43,444 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:43,444 INFO L82 PathProgramCache]: Analyzing trace with hash 1333671982, now seen corresponding path program 7 times [2018-12-03 18:14:43,445 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:43,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:43,446 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:43,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:43,446 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:43,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:43,606 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:43,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:43,607 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:43,607 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:43,607 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:43,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:43,608 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 18:14:43,618 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:43,618 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:14:43,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:43,628 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:43,801 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:43,802 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:43,989 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:44,008 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:44,008 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 24 [2018-12-03 18:14:44,008 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:44,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 18:14:44,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 18:14:44,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=353, Unknown=0, NotChecked=0, Total=650 [2018-12-03 18:14:44,010 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 18 states. [2018-12-03 18:14:44,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:44,076 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-12-03 18:14:44,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 18:14:44,077 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 17 [2018-12-03 18:14:44,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:44,078 INFO L225 Difference]: With dead ends: 21 [2018-12-03 18:14:44,078 INFO L226 Difference]: Without dead ends: 20 [2018-12-03 18:14:44,079 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=297, Invalid=353, Unknown=0, NotChecked=0, Total=650 [2018-12-03 18:14:44,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-12-03 18:14:44,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-12-03 18:14:44,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-12-03 18:14:44,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-12-03 18:14:44,083 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-12-03 18:14:44,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:44,083 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-12-03 18:14:44,084 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 18:14:44,084 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-12-03 18:14:44,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-12-03 18:14:44,084 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:44,084 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 1, 1] [2018-12-03 18:14:44,084 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:44,085 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:44,085 INFO L82 PathProgramCache]: Analyzing trace with hash 1758521584, now seen corresponding path program 8 times [2018-12-03 18:14:44,085 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:44,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:44,086 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:44,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:44,086 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:44,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:44,210 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:44,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:44,210 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:44,210 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:44,211 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:44,211 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:44,211 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 18:14:44,220 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:14:44,221 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:14:44,245 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-03 18:14:44,245 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:44,248 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:44,462 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:44,463 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:44,624 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:44,645 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:44,645 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 27 [2018-12-03 18:14:44,645 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:44,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 18:14:44,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 18:14:44,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=442, Unknown=0, NotChecked=0, Total=812 [2018-12-03 18:14:44,647 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 20 states. [2018-12-03 18:14:44,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:44,693 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-12-03 18:14:44,694 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 18:14:44,694 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 19 [2018-12-03 18:14:44,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:44,695 INFO L225 Difference]: With dead ends: 23 [2018-12-03 18:14:44,696 INFO L226 Difference]: Without dead ends: 22 [2018-12-03 18:14:44,697 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=370, Invalid=442, Unknown=0, NotChecked=0, Total=812 [2018-12-03 18:14:44,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-12-03 18:14:44,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-12-03 18:14:44,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-12-03 18:14:44,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-12-03 18:14:44,701 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-12-03 18:14:44,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:44,701 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-12-03 18:14:44,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 18:14:44,701 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-12-03 18:14:44,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 18:14:44,702 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:44,702 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 1, 1] [2018-12-03 18:14:44,702 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:44,703 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:44,703 INFO L82 PathProgramCache]: Analyzing trace with hash 2017095986, now seen corresponding path program 9 times [2018-12-03 18:14:44,703 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:44,704 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:44,704 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:44,705 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:44,705 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:44,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:44,850 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:44,851 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:44,851 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:44,851 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:44,851 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:44,851 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:44,851 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 18:14:44,865 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:14:44,865 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:14:44,893 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:14:44,894 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:44,896 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:45,214 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:45,215 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:45,624 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:45,643 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:45,643 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 30 [2018-12-03 18:14:45,643 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:45,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 18:14:45,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 18:14:45,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=541, Unknown=0, NotChecked=0, Total=992 [2018-12-03 18:14:45,645 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 22 states. [2018-12-03 18:14:45,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:45,907 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-12-03 18:14:45,907 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 18:14:45,907 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 21 [2018-12-03 18:14:45,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:45,908 INFO L225 Difference]: With dead ends: 25 [2018-12-03 18:14:45,908 INFO L226 Difference]: Without dead ends: 24 [2018-12-03 18:14:45,909 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=451, Invalid=541, Unknown=0, NotChecked=0, Total=992 [2018-12-03 18:14:45,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-12-03 18:14:45,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-12-03 18:14:45,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-03 18:14:45,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-12-03 18:14:45,919 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-12-03 18:14:45,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:45,919 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-12-03 18:14:45,919 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 18:14:45,919 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-12-03 18:14:45,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-03 18:14:45,920 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:45,920 INFO L402 BasicCegarLoop]: trace histogram [11, 10, 1, 1] [2018-12-03 18:14:45,920 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:45,921 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:45,921 INFO L82 PathProgramCache]: Analyzing trace with hash 1398993140, now seen corresponding path program 10 times [2018-12-03 18:14:45,921 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:45,922 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:45,924 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:45,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:45,924 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:45,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:46,171 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:46,172 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:46,172 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:46,172 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:46,172 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:46,173 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:46,173 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 18:14:46,183 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:46,183 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:14:46,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:46,192 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:46,429 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:46,430 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:46,734 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:46,754 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:46,754 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 33 [2018-12-03 18:14:46,754 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:46,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-03 18:14:46,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-03 18:14:46,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=650, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 18:14:46,756 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 24 states. [2018-12-03 18:14:47,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:47,120 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-12-03 18:14:47,120 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 18:14:47,120 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 23 [2018-12-03 18:14:47,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:47,121 INFO L225 Difference]: With dead ends: 27 [2018-12-03 18:14:47,121 INFO L226 Difference]: Without dead ends: 26 [2018-12-03 18:14:47,122 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=540, Invalid=650, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 18:14:47,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-12-03 18:14:47,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-12-03 18:14:47,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-12-03 18:14:47,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-12-03 18:14:47,126 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-12-03 18:14:47,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:47,127 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-12-03 18:14:47,127 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-03 18:14:47,127 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-12-03 18:14:47,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-12-03 18:14:47,127 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:47,127 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 1, 1] [2018-12-03 18:14:47,128 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:47,128 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:47,128 INFO L82 PathProgramCache]: Analyzing trace with hash 107644982, now seen corresponding path program 11 times [2018-12-03 18:14:47,128 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:47,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:47,129 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:47,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:47,129 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:47,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:47,331 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:47,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:47,331 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:47,331 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:47,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:47,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:47,332 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 18:14:47,341 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:14:47,342 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:14:47,366 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-03 18:14:47,367 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:47,369 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:48,012 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:48,012 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:48,519 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:48,540 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:48,540 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 36 [2018-12-03 18:14:48,540 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:48,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 18:14:48,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 18:14:48,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=637, Invalid=769, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 18:14:48,542 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 26 states. [2018-12-03 18:14:48,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:48,613 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-12-03 18:14:48,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 18:14:48,614 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 25 [2018-12-03 18:14:48,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:48,615 INFO L225 Difference]: With dead ends: 29 [2018-12-03 18:14:48,615 INFO L226 Difference]: Without dead ends: 28 [2018-12-03 18:14:48,617 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=637, Invalid=769, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 18:14:48,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-03 18:14:48,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-12-03 18:14:48,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-03 18:14:48,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-12-03 18:14:48,621 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-12-03 18:14:48,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:48,622 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-12-03 18:14:48,622 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 18:14:48,622 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-12-03 18:14:48,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-03 18:14:48,623 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:48,623 INFO L402 BasicCegarLoop]: trace histogram [13, 12, 1, 1] [2018-12-03 18:14:48,623 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:48,623 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:48,623 INFO L82 PathProgramCache]: Analyzing trace with hash 367613688, now seen corresponding path program 12 times [2018-12-03 18:14:48,623 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:48,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:48,624 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:48,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:48,625 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:48,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:48,762 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:48,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:48,763 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:48,763 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:48,763 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:48,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:48,763 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 18:14:48,773 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:14:48,774 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:14:48,803 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:14:48,803 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:48,804 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:49,006 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:49,006 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:49,333 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:49,352 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:49,352 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 39 [2018-12-03 18:14:49,352 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:49,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-12-03 18:14:49,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-12-03 18:14:49,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=742, Invalid=898, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 18:14:49,354 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 28 states. [2018-12-03 18:14:49,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:49,439 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-12-03 18:14:49,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 18:14:49,440 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 27 [2018-12-03 18:14:49,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:49,441 INFO L225 Difference]: With dead ends: 31 [2018-12-03 18:14:49,441 INFO L226 Difference]: Without dead ends: 30 [2018-12-03 18:14:49,442 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=742, Invalid=898, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 18:14:49,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-12-03 18:14:49,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-12-03 18:14:49,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-03 18:14:49,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-12-03 18:14:49,447 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-12-03 18:14:49,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:49,448 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-12-03 18:14:49,448 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-12-03 18:14:49,448 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-12-03 18:14:49,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-12-03 18:14:49,449 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:49,449 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 1, 1] [2018-12-03 18:14:49,449 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:49,450 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:49,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1089436986, now seen corresponding path program 13 times [2018-12-03 18:14:49,450 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:49,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:49,451 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:49,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:49,451 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:49,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:49,654 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:49,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:49,655 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:49,655 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:49,655 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:49,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:49,655 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 18:14:49,664 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:49,664 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:14:49,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:49,675 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:49,932 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:49,933 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:50,973 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:50,994 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:50,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 42 [2018-12-03 18:14:50,994 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:50,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-12-03 18:14:50,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-12-03 18:14:50,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=855, Invalid=1037, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 18:14:50,996 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 30 states. [2018-12-03 18:14:51,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:51,069 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-12-03 18:14:51,071 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 18:14:51,071 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 29 [2018-12-03 18:14:51,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:51,072 INFO L225 Difference]: With dead ends: 33 [2018-12-03 18:14:51,073 INFO L226 Difference]: Without dead ends: 32 [2018-12-03 18:14:51,074 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 756 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=855, Invalid=1037, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 18:14:51,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-12-03 18:14:51,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-12-03 18:14:51,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-12-03 18:14:51,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-12-03 18:14:51,080 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-12-03 18:14:51,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:51,080 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-12-03 18:14:51,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-12-03 18:14:51,080 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-12-03 18:14:51,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-12-03 18:14:51,081 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:51,081 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 1, 1] [2018-12-03 18:14:51,082 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:51,082 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:51,082 INFO L82 PathProgramCache]: Analyzing trace with hash -1023075588, now seen corresponding path program 14 times [2018-12-03 18:14:51,082 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:51,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:51,083 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:51,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:51,083 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:51,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:51,341 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:51,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:51,341 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:51,341 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:51,341 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:51,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:51,341 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 18:14:51,351 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:14:51,351 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:14:51,371 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-03 18:14:51,371 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:51,373 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:52,301 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:52,302 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:52,660 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:52,679 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:52,679 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 45 [2018-12-03 18:14:52,679 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:52,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 18:14:52,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 18:14:52,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=976, Invalid=1186, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 18:14:52,681 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 32 states. [2018-12-03 18:14:52,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:52,838 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-12-03 18:14:52,839 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 18:14:52,839 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 31 [2018-12-03 18:14:52,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:52,840 INFO L225 Difference]: With dead ends: 35 [2018-12-03 18:14:52,840 INFO L226 Difference]: Without dead ends: 34 [2018-12-03 18:14:52,842 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 870 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=976, Invalid=1186, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 18:14:52,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-12-03 18:14:52,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-12-03 18:14:52,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-12-03 18:14:52,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-12-03 18:14:52,845 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-12-03 18:14:52,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:52,846 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-12-03 18:14:52,846 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 18:14:52,846 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-12-03 18:14:52,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-12-03 18:14:52,846 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:52,847 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 1, 1] [2018-12-03 18:14:52,847 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:52,847 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:52,847 INFO L82 PathProgramCache]: Analyzing trace with hash 371871806, now seen corresponding path program 15 times [2018-12-03 18:14:52,847 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:52,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:52,848 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:52,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:52,849 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:52,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:53,179 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:53,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:53,180 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:53,180 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:53,181 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:53,181 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:53,181 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 18:14:53,190 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:14:53,190 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:14:53,224 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:14:53,224 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:53,230 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:53,604 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:53,604 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:53,952 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:53,975 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:53,975 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 48 [2018-12-03 18:14:53,976 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:53,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-12-03 18:14:53,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-12-03 18:14:53,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1105, Invalid=1345, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 18:14:53,977 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 34 states. [2018-12-03 18:14:54,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:54,117 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-12-03 18:14:54,118 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 18:14:54,118 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 33 [2018-12-03 18:14:54,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:54,119 INFO L225 Difference]: With dead ends: 37 [2018-12-03 18:14:54,119 INFO L226 Difference]: Without dead ends: 36 [2018-12-03 18:14:54,121 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1105, Invalid=1345, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 18:14:54,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-12-03 18:14:54,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-12-03 18:14:54,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-12-03 18:14:54,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-12-03 18:14:54,126 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-12-03 18:14:54,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:54,126 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-12-03 18:14:54,126 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-12-03 18:14:54,126 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-12-03 18:14:54,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-12-03 18:14:54,127 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:54,127 INFO L402 BasicCegarLoop]: trace histogram [17, 16, 1, 1] [2018-12-03 18:14:54,127 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:54,127 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:54,127 INFO L82 PathProgramCache]: Analyzing trace with hash 886521088, now seen corresponding path program 16 times [2018-12-03 18:14:54,127 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:54,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:54,128 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:54,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:54,129 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:54,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:54,682 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:54,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:54,682 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:54,683 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:54,683 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:54,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:54,683 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 18:14:54,692 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:54,692 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:14:54,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:54,704 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:54,958 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:54,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:55,362 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:55,384 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:55,384 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 51 [2018-12-03 18:14:55,384 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:55,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-12-03 18:14:55,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-12-03 18:14:55,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1242, Invalid=1514, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 18:14:55,386 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 36 states. [2018-12-03 18:14:55,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:55,471 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-12-03 18:14:55,471 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 18:14:55,471 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 35 [2018-12-03 18:14:55,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:55,472 INFO L225 Difference]: With dead ends: 39 [2018-12-03 18:14:55,472 INFO L226 Difference]: Without dead ends: 38 [2018-12-03 18:14:55,474 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1122 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1242, Invalid=1514, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 18:14:55,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-12-03 18:14:55,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-12-03 18:14:55,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-12-03 18:14:55,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-12-03 18:14:55,479 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-12-03 18:14:55,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:55,479 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-12-03 18:14:55,479 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-12-03 18:14:55,479 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-12-03 18:14:55,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-12-03 18:14:55,480 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:55,480 INFO L402 BasicCegarLoop]: trace histogram [18, 17, 1, 1] [2018-12-03 18:14:55,481 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:55,481 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:55,481 INFO L82 PathProgramCache]: Analyzing trace with hash 1543242050, now seen corresponding path program 17 times [2018-12-03 18:14:55,481 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:55,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:55,482 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:55,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:55,482 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:55,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:55,694 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:55,694 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:55,694 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:55,694 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:55,694 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:55,694 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:55,695 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 18:14:55,703 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:14:55,704 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:14:55,720 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-03 18:14:55,721 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:55,722 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:56,028 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:56,028 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:56,623 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:56,643 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:56,643 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 54 [2018-12-03 18:14:56,643 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:56,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 18:14:56,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 18:14:56,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1387, Invalid=1693, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 18:14:56,645 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 38 states. [2018-12-03 18:14:56,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:56,903 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-12-03 18:14:56,903 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 18:14:56,904 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 37 [2018-12-03 18:14:56,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:56,905 INFO L225 Difference]: With dead ends: 41 [2018-12-03 18:14:56,905 INFO L226 Difference]: Without dead ends: 40 [2018-12-03 18:14:56,907 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1260 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1387, Invalid=1693, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 18:14:56,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-03 18:14:56,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-12-03 18:14:56,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-12-03 18:14:56,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-12-03 18:14:56,912 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-12-03 18:14:56,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:56,913 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-12-03 18:14:56,913 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 18:14:56,913 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-12-03 18:14:56,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-12-03 18:14:56,914 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:56,914 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 1, 1] [2018-12-03 18:14:56,914 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:56,914 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:56,914 INFO L82 PathProgramCache]: Analyzing trace with hash 1291894020, now seen corresponding path program 18 times [2018-12-03 18:14:56,915 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:56,915 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:56,916 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:56,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:56,916 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:56,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:57,447 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:57,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:57,448 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:57,448 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:57,448 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:57,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:57,449 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 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 18:14:57,466 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:14:57,466 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:14:57,479 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:14:57,479 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:57,481 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:57,755 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:57,756 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:58,558 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:58,578 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:58,578 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 57 [2018-12-03 18:14:58,578 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:58,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-12-03 18:14:58,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-12-03 18:14:58,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1882, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 18:14:58,580 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 40 states. [2018-12-03 18:14:58,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:58,711 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-12-03 18:14:58,711 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 18:14:58,711 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 39 [2018-12-03 18:14:58,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:58,712 INFO L225 Difference]: With dead ends: 43 [2018-12-03 18:14:58,712 INFO L226 Difference]: Without dead ends: 42 [2018-12-03 18:14:58,713 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1406 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1540, Invalid=1882, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 18:14:58,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-12-03 18:14:58,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-12-03 18:14:58,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-12-03 18:14:58,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-12-03 18:14:58,718 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-12-03 18:14:58,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:58,718 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-12-03 18:14:58,718 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-12-03 18:14:58,718 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-12-03 18:14:58,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-12-03 18:14:58,719 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:58,719 INFO L402 BasicCegarLoop]: trace histogram [20, 19, 1, 1] [2018-12-03 18:14:58,719 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:58,720 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:58,720 INFO L82 PathProgramCache]: Analyzing trace with hash 264605766, now seen corresponding path program 19 times [2018-12-03 18:14:58,720 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:58,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:58,721 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:58,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:58,721 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:58,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:58,976 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:58,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:58,977 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:58,977 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:58,977 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:58,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:58,977 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 18:14:58,987 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:58,987 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:14:58,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:59,000 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:59,313 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:59,313 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:59,798 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:59,818 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:59,818 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 60 [2018-12-03 18:14:59,818 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:59,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-12-03 18:14:59,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-12-03 18:14:59,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1701, Invalid=2081, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 18:14:59,820 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 42 states. [2018-12-03 18:14:59,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:59,907 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-12-03 18:14:59,907 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-03 18:14:59,908 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 41 [2018-12-03 18:14:59,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:59,908 INFO L225 Difference]: With dead ends: 45 [2018-12-03 18:14:59,909 INFO L226 Difference]: Without dead ends: 44 [2018-12-03 18:14:59,911 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1560 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1701, Invalid=2081, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 18:14:59,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-12-03 18:14:59,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-12-03 18:14:59,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-12-03 18:14:59,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-12-03 18:14:59,915 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-12-03 18:14:59,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:59,916 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-12-03 18:14:59,916 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-12-03 18:14:59,916 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-12-03 18:14:59,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-12-03 18:14:59,916 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:59,917 INFO L402 BasicCegarLoop]: trace histogram [21, 20, 1, 1] [2018-12-03 18:14:59,917 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:59,917 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:59,917 INFO L82 PathProgramCache]: Analyzing trace with hash 883071752, now seen corresponding path program 20 times [2018-12-03 18:14:59,917 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:59,918 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:59,918 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:59,918 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:59,919 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:59,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:00,869 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:00,869 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:00,869 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:00,869 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:00,869 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:00,870 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:00,870 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 18:15:00,879 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:15:00,879 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:15:00,903 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-12-03 18:15:00,903 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:00,907 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:01,232 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:01,233 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:01,772 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:01,791 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:01,792 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 63 [2018-12-03 18:15:01,792 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:01,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 18:15:01,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 18:15:01,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1870, Invalid=2290, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 18:15:01,794 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 44 states. [2018-12-03 18:15:01,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:01,880 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-12-03 18:15:01,882 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 18:15:01,882 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 43 [2018-12-03 18:15:01,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:01,883 INFO L225 Difference]: With dead ends: 47 [2018-12-03 18:15:01,883 INFO L226 Difference]: Without dead ends: 46 [2018-12-03 18:15:01,885 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1722 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1870, Invalid=2290, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 18:15:01,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-12-03 18:15:01,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-12-03 18:15:01,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-12-03 18:15:01,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-12-03 18:15:01,891 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-12-03 18:15:01,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:01,891 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-12-03 18:15:01,891 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 18:15:01,892 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-12-03 18:15:01,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-12-03 18:15:01,893 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:01,893 INFO L402 BasicCegarLoop]: trace histogram [22, 21, 1, 1] [2018-12-03 18:15:01,893 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:01,893 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:01,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1771569846, now seen corresponding path program 21 times [2018-12-03 18:15:01,893 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:01,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:01,894 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:01,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:01,895 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:01,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:02,193 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:02,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:02,193 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:02,194 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:02,194 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:02,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:02,194 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 18:15:02,203 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:15:02,203 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:15:02,216 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:15:02,216 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:02,219 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:02,619 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:02,619 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:03,536 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:03,555 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:03,556 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 66 [2018-12-03 18:15:03,556 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:03,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-12-03 18:15:03,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-12-03 18:15:03,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2047, Invalid=2509, Unknown=0, NotChecked=0, Total=4556 [2018-12-03 18:15:03,558 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 46 states. [2018-12-03 18:15:03,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:03,645 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-12-03 18:15:03,648 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 18:15:03,648 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 45 [2018-12-03 18:15:03,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:03,649 INFO L225 Difference]: With dead ends: 49 [2018-12-03 18:15:03,649 INFO L226 Difference]: Without dead ends: 48 [2018-12-03 18:15:03,650 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1892 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2047, Invalid=2509, Unknown=0, NotChecked=0, Total=4556 [2018-12-03 18:15:03,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-12-03 18:15:03,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-12-03 18:15:03,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-12-03 18:15:03,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-12-03 18:15:03,655 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 45 [2018-12-03 18:15:03,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:03,655 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-12-03 18:15:03,655 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-12-03 18:15:03,656 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-12-03 18:15:03,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-12-03 18:15:03,656 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:03,656 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 1, 1] [2018-12-03 18:15:03,657 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:03,657 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:03,657 INFO L82 PathProgramCache]: Analyzing trace with hash -1671571700, now seen corresponding path program 22 times [2018-12-03 18:15:03,657 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:03,658 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:03,658 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:03,658 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:03,658 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:03,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:04,020 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:04,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:04,020 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:04,020 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:04,020 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:04,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:04,021 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:15:04,030 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:04,030 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:15:04,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:04,042 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:05,100 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:05,100 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:05,732 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:05,751 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:05,751 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 69 [2018-12-03 18:15:05,751 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:05,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-12-03 18:15:05,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-12-03 18:15:05,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2232, Invalid=2738, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 18:15:05,753 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 48 states. [2018-12-03 18:15:05,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:05,881 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-12-03 18:15:05,881 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 18:15:05,881 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 47 [2018-12-03 18:15:05,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:05,882 INFO L225 Difference]: With dead ends: 51 [2018-12-03 18:15:05,882 INFO L226 Difference]: Without dead ends: 50 [2018-12-03 18:15:05,884 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2070 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2232, Invalid=2738, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 18:15:05,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-12-03 18:15:05,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-12-03 18:15:05,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-12-03 18:15:05,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-12-03 18:15:05,888 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 47 [2018-12-03 18:15:05,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:05,888 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-12-03 18:15:05,888 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-12-03 18:15:05,888 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-12-03 18:15:05,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-12-03 18:15:05,889 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:05,889 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 1, 1] [2018-12-03 18:15:05,889 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:05,890 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:05,890 INFO L82 PathProgramCache]: Analyzing trace with hash -62633906, now seen corresponding path program 23 times [2018-12-03 18:15:05,890 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:05,891 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:05,891 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:05,891 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:05,891 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:05,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:06,211 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:06,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:06,212 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:06,212 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:06,212 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:06,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:06,213 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 18:15:06,225 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:15:06,226 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:15:06,245 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 18:15:06,245 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:06,247 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:06,661 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:06,662 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:07,402 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:07,421 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:07,421 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 72 [2018-12-03 18:15:07,421 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:07,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 18:15:07,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 18:15:07,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 18:15:07,423 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 50 states. [2018-12-03 18:15:07,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:07,550 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-12-03 18:15:07,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 18:15:07,550 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 49 [2018-12-03 18:15:07,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:07,551 INFO L225 Difference]: With dead ends: 53 [2018-12-03 18:15:07,551 INFO L226 Difference]: Without dead ends: 52 [2018-12-03 18:15:07,553 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2256 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 18:15:07,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-12-03 18:15:07,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-12-03 18:15:07,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-12-03 18:15:07,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-12-03 18:15:07,557 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 49 [2018-12-03 18:15:07,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:07,557 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-12-03 18:15:07,557 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 18:15:07,557 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-12-03 18:15:07,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-12-03 18:15:07,570 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:07,571 INFO L402 BasicCegarLoop]: trace histogram [25, 24, 1, 1] [2018-12-03 18:15:07,571 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:07,571 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:07,571 INFO L82 PathProgramCache]: Analyzing trace with hash -61640432, now seen corresponding path program 24 times [2018-12-03 18:15:07,571 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:07,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:07,572 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:07,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:07,573 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:07,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:08,036 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:08,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:08,037 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:08,037 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:08,037 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:08,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:08,037 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 18:15:08,046 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:15:08,046 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:15:08,059 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:15:08,059 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:08,061 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:08,678 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:08,678 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:09,495 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:09,514 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:09,514 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 75 [2018-12-03 18:15:09,514 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:09,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-12-03 18:15:09,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-12-03 18:15:09,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=3226, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 18:15:09,516 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 52 states. [2018-12-03 18:15:09,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:09,633 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-12-03 18:15:09,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 18:15:09,637 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 51 [2018-12-03 18:15:09,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:09,638 INFO L225 Difference]: With dead ends: 55 [2018-12-03 18:15:09,638 INFO L226 Difference]: Without dead ends: 54 [2018-12-03 18:15:09,639 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2450 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2626, Invalid=3226, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 18:15:09,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-12-03 18:15:09,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-12-03 18:15:09,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-12-03 18:15:09,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-12-03 18:15:09,643 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 51 [2018-12-03 18:15:09,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:09,643 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-12-03 18:15:09,643 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-12-03 18:15:09,643 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-12-03 18:15:09,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-12-03 18:15:09,644 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:09,644 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 1, 1] [2018-12-03 18:15:09,644 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:09,645 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:09,645 INFO L82 PathProgramCache]: Analyzing trace with hash 893088082, now seen corresponding path program 25 times [2018-12-03 18:15:09,645 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:09,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:09,646 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:09,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:09,646 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:09,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:10,030 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:10,031 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:10,031 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:10,031 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:10,031 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:10,031 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:10,031 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 18:15:10,040 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:10,040 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:15:10,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:10,054 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:10,603 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:10,604 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:11,558 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:11,577 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:11,577 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 78 [2018-12-03 18:15:11,577 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:11,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-12-03 18:15:11,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-12-03 18:15:11,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2835, Invalid=3485, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 18:15:11,580 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 54 states. [2018-12-03 18:15:11,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:11,824 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-12-03 18:15:11,825 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-12-03 18:15:11,825 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 53 [2018-12-03 18:15:11,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:11,826 INFO L225 Difference]: With dead ends: 57 [2018-12-03 18:15:11,826 INFO L226 Difference]: Without dead ends: 56 [2018-12-03 18:15:11,827 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2652 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2835, Invalid=3485, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 18:15:11,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-12-03 18:15:11,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2018-12-03 18:15:11,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-12-03 18:15:11,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-12-03 18:15:11,831 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 53 [2018-12-03 18:15:11,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:11,831 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-12-03 18:15:11,831 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-12-03 18:15:11,831 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-12-03 18:15:11,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-12-03 18:15:11,832 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:11,832 INFO L402 BasicCegarLoop]: trace histogram [27, 26, 1, 1] [2018-12-03 18:15:11,832 INFO L423 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:11,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:11,833 INFO L82 PathProgramCache]: Analyzing trace with hash -735811308, now seen corresponding path program 26 times [2018-12-03 18:15:11,833 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:11,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:11,834 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:11,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:11,834 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:11,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:12,266 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:12,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:12,266 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:12,267 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:12,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:12,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:12,267 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 18:15:12,276 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:15:12,276 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:15:12,299 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-12-03 18:15:12,299 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:12,300 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:12,763 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:12,763 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:13,854 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:13,873 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:13,874 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 81 [2018-12-03 18:15:13,874 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:13,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-12-03 18:15:13,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-12-03 18:15:13,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3052, Invalid=3754, Unknown=0, NotChecked=0, Total=6806 [2018-12-03 18:15:13,876 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 56 states. [2018-12-03 18:15:13,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:13,991 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-12-03 18:15:13,992 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 18:15:13,992 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 55 [2018-12-03 18:15:13,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:13,993 INFO L225 Difference]: With dead ends: 59 [2018-12-03 18:15:13,993 INFO L226 Difference]: Without dead ends: 58 [2018-12-03 18:15:13,994 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2862 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=3052, Invalid=3754, Unknown=0, NotChecked=0, Total=6806 [2018-12-03 18:15:13,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-03 18:15:13,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-12-03 18:15:13,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-12-03 18:15:13,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2018-12-03 18:15:13,998 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 55 [2018-12-03 18:15:13,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:13,998 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2018-12-03 18:15:13,998 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-12-03 18:15:13,999 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2018-12-03 18:15:13,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-12-03 18:15:13,999 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:13,999 INFO L402 BasicCegarLoop]: trace histogram [28, 27, 1, 1] [2018-12-03 18:15:13,999 INFO L423 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:13,999 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:14,000 INFO L82 PathProgramCache]: Analyzing trace with hash 1554937942, now seen corresponding path program 27 times [2018-12-03 18:15:14,000 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:14,000 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:14,000 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:14,001 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:14,001 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:14,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:14,992 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:14,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:14,993 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:14,993 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:14,993 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:14,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:14,993 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 18:15:15,004 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:15:15,004 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:15:15,019 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:15:15,019 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:15,020 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:15,535 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:15,535 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:16,465 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:16,483 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:16,483 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 84 [2018-12-03 18:15:16,484 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:16,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-12-03 18:15:16,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-12-03 18:15:16,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3277, Invalid=4033, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 18:15:16,486 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 58 states. [2018-12-03 18:15:16,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:16,625 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-12-03 18:15:16,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-12-03 18:15:16,625 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 57 [2018-12-03 18:15:16,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:16,626 INFO L225 Difference]: With dead ends: 61 [2018-12-03 18:15:16,626 INFO L226 Difference]: Without dead ends: 60 [2018-12-03 18:15:16,627 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3080 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=3277, Invalid=4033, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 18:15:16,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-12-03 18:15:16,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-12-03 18:15:16,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-12-03 18:15:16,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-12-03 18:15:16,631 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 57 [2018-12-03 18:15:16,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:16,631 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-12-03 18:15:16,631 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-12-03 18:15:16,632 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-12-03 18:15:16,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-12-03 18:15:16,632 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:16,632 INFO L402 BasicCegarLoop]: trace histogram [29, 28, 1, 1] [2018-12-03 18:15:16,633 INFO L423 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:16,633 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:16,633 INFO L82 PathProgramCache]: Analyzing trace with hash -353255656, now seen corresponding path program 28 times [2018-12-03 18:15:16,633 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:16,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:16,634 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:16,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:16,634 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:16,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:17,202 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:17,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:17,202 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:17,203 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:17,203 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:17,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:17,203 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 18:15:17,211 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:17,212 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:15:17,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:17,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:17,776 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:17,776 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:18,988 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:19,007 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:19,007 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 87 [2018-12-03 18:15:19,007 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:19,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-12-03 18:15:19,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-12-03 18:15:19,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3510, Invalid=4322, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 18:15:19,009 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 60 states. [2018-12-03 18:15:19,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:19,221 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-12-03 18:15:19,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 18:15:19,221 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 59 [2018-12-03 18:15:19,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:19,222 INFO L225 Difference]: With dead ends: 63 [2018-12-03 18:15:19,223 INFO L226 Difference]: Without dead ends: 62 [2018-12-03 18:15:19,224 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3306 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=3510, Invalid=4322, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 18:15:19,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-12-03 18:15:19,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2018-12-03 18:15:19,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-12-03 18:15:19,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2018-12-03 18:15:19,228 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 59 [2018-12-03 18:15:19,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:19,228 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2018-12-03 18:15:19,228 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-12-03 18:15:19,229 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2018-12-03 18:15:19,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-12-03 18:15:19,229 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:19,229 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 1, 1] [2018-12-03 18:15:19,229 INFO L423 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:19,230 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:19,230 INFO L82 PathProgramCache]: Analyzing trace with hash -176267942, now seen corresponding path program 29 times [2018-12-03 18:15:19,230 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:19,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:19,231 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:19,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:19,231 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:19,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:19,688 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:19,689 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:19,689 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:19,689 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:19,689 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:19,689 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:19,689 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 18:15:19,697 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:15:19,698 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:15:19,722 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-12-03 18:15:19,722 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:19,724 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:20,389 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:20,389 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:21,483 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:21,502 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:21,502 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 90 [2018-12-03 18:15:21,502 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:21,502 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-12-03 18:15:21,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-12-03 18:15:21,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3751, Invalid=4621, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 18:15:21,504 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 62 states. [2018-12-03 18:15:21,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:21,625 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2018-12-03 18:15:21,626 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-12-03 18:15:21,626 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 61 [2018-12-03 18:15:21,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:21,627 INFO L225 Difference]: With dead ends: 65 [2018-12-03 18:15:21,627 INFO L226 Difference]: Without dead ends: 64 [2018-12-03 18:15:21,628 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3540 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=3751, Invalid=4621, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 18:15:21,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-12-03 18:15:21,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2018-12-03 18:15:21,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-12-03 18:15:21,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2018-12-03 18:15:21,632 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 61 [2018-12-03 18:15:21,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:21,632 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2018-12-03 18:15:21,632 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-12-03 18:15:21,632 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2018-12-03 18:15:21,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-12-03 18:15:21,632 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:21,632 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 1, 1] [2018-12-03 18:15:21,633 INFO L423 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:21,633 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:21,633 INFO L82 PathProgramCache]: Analyzing trace with hash -1889766628, now seen corresponding path program 30 times [2018-12-03 18:15:21,633 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:21,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:21,634 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:21,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:21,634 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:21,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:22,199 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:22,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:22,199 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:22,200 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:22,200 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:22,200 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:22,200 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 18:15:22,216 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:15:22,216 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:15:22,233 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:15:22,233 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:22,235 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:22,839 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:22,840 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:24,284 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:24,303 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:24,303 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 93 [2018-12-03 18:15:24,303 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:24,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-12-03 18:15:24,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-12-03 18:15:24,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4000, Invalid=4930, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 18:15:24,305 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand 64 states. [2018-12-03 18:15:24,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:24,433 INFO L93 Difference]: Finished difference Result 67 states and 67 transitions. [2018-12-03 18:15:24,434 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 18:15:24,434 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 63 [2018-12-03 18:15:24,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:24,435 INFO L225 Difference]: With dead ends: 67 [2018-12-03 18:15:24,435 INFO L226 Difference]: Without dead ends: 66 [2018-12-03 18:15:24,436 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3782 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=4000, Invalid=4930, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 18:15:24,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-12-03 18:15:24,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-12-03 18:15:24,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-12-03 18:15:24,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-12-03 18:15:24,439 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 63 [2018-12-03 18:15:24,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:24,439 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-12-03 18:15:24,439 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-12-03 18:15:24,440 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-12-03 18:15:24,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-12-03 18:15:24,440 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:24,440 INFO L402 BasicCegarLoop]: trace histogram [32, 31, 1, 1] [2018-12-03 18:15:24,440 INFO L423 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:24,440 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:24,440 INFO L82 PathProgramCache]: Analyzing trace with hash 705437790, now seen corresponding path program 31 times [2018-12-03 18:15:24,441 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:24,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:24,441 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:24,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:24,442 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:24,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:25,023 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:25,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:25,024 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:25,024 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:25,024 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:25,024 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:25,024 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 18:15:25,035 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:25,035 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:15:25,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:25,053 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:25,679 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:25,680 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:27,082 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:27,101 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:27,101 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 96 [2018-12-03 18:15:27,101 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:27,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-12-03 18:15:27,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-12-03 18:15:27,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4257, Invalid=5249, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 18:15:27,104 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 66 states. [2018-12-03 18:15:27,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:27,258 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-12-03 18:15:27,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-12-03 18:15:27,259 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 65 [2018-12-03 18:15:27,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:27,260 INFO L225 Difference]: With dead ends: 69 [2018-12-03 18:15:27,260 INFO L226 Difference]: Without dead ends: 68 [2018-12-03 18:15:27,262 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4032 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=4257, Invalid=5249, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 18:15:27,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-12-03 18:15:27,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2018-12-03 18:15:27,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-12-03 18:15:27,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2018-12-03 18:15:27,265 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 65 [2018-12-03 18:15:27,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:27,266 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2018-12-03 18:15:27,266 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-12-03 18:15:27,266 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2018-12-03 18:15:27,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-12-03 18:15:27,267 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:27,267 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 1, 1] [2018-12-03 18:15:27,267 INFO L423 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:27,267 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:27,267 INFO L82 PathProgramCache]: Analyzing trace with hash -679115488, now seen corresponding path program 32 times [2018-12-03 18:15:27,267 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:27,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:27,268 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:27,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:27,268 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:27,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:28,109 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 0 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:28,109 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:28,109 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:28,110 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:28,110 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:28,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:28,110 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 18:15:28,118 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:15:28,118 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:15:28,147 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-12-03 18:15:28,147 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:28,149 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:29,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 0 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:29,133 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:30,463 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 0 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:30,482 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:30,482 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 99 [2018-12-03 18:15:30,483 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:30,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-12-03 18:15:30,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-12-03 18:15:30,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4522, Invalid=5578, Unknown=0, NotChecked=0, Total=10100 [2018-12-03 18:15:30,485 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 68 states. [2018-12-03 18:15:30,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:30,615 INFO L93 Difference]: Finished difference Result 71 states and 71 transitions. [2018-12-03 18:15:30,616 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 18:15:30,616 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 67 [2018-12-03 18:15:30,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:30,617 INFO L225 Difference]: With dead ends: 71 [2018-12-03 18:15:30,617 INFO L226 Difference]: Without dead ends: 70 [2018-12-03 18:15:30,619 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4290 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=4522, Invalid=5578, Unknown=0, NotChecked=0, Total=10100 [2018-12-03 18:15:30,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-12-03 18:15:30,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-12-03 18:15:30,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-12-03 18:15:30,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2018-12-03 18:15:30,622 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 67 [2018-12-03 18:15:30,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:30,622 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2018-12-03 18:15:30,622 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-12-03 18:15:30,622 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2018-12-03 18:15:30,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-12-03 18:15:30,623 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:30,623 INFO L402 BasicCegarLoop]: trace histogram [34, 33, 1, 1] [2018-12-03 18:15:30,623 INFO L423 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:30,624 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:30,624 INFO L82 PathProgramCache]: Analyzing trace with hash 205046114, now seen corresponding path program 33 times [2018-12-03 18:15:30,624 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:30,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:30,625 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:30,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:30,625 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:30,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:31,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 0 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:31,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:31,358 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:31,358 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:31,359 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:31,359 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:31,359 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 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 18:15:31,368 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:15:31,368 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:15:31,385 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:15:31,385 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:31,387 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:32,067 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 0 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:32,067 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:33,636 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 0 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:33,655 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:33,655 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 102 [2018-12-03 18:15:33,655 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:33,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-12-03 18:15:33,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-12-03 18:15:33,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4795, Invalid=5917, Unknown=0, NotChecked=0, Total=10712 [2018-12-03 18:15:33,657 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 70 states. [2018-12-03 18:15:33,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:33,840 INFO L93 Difference]: Finished difference Result 73 states and 73 transitions. [2018-12-03 18:15:33,840 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-12-03 18:15:33,840 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 69 [2018-12-03 18:15:33,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:33,841 INFO L225 Difference]: With dead ends: 73 [2018-12-03 18:15:33,842 INFO L226 Difference]: Without dead ends: 72 [2018-12-03 18:15:33,843 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4556 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=4795, Invalid=5917, Unknown=0, NotChecked=0, Total=10712 [2018-12-03 18:15:33,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-12-03 18:15:33,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-12-03 18:15:33,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-12-03 18:15:33,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2018-12-03 18:15:33,846 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 69 [2018-12-03 18:15:33,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:33,846 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2018-12-03 18:15:33,847 INFO L481 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-12-03 18:15:33,847 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2018-12-03 18:15:33,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-12-03 18:15:33,847 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:33,847 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 1, 1] [2018-12-03 18:15:33,848 INFO L423 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:33,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:33,848 INFO L82 PathProgramCache]: Analyzing trace with hash -519178972, now seen corresponding path program 34 times [2018-12-03 18:15:33,848 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:33,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:33,849 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:33,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:33,849 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:33,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:34,573 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:34,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:34,574 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:34,574 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:34,574 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:34,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:34,575 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 18:15:34,586 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:34,586 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:15:34,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:34,603 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:35,343 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:35,343 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:36,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:36,800 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:36,801 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 105 [2018-12-03 18:15:36,801 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:36,801 INFO L459 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-12-03 18:15:36,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-12-03 18:15:36,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5076, Invalid=6266, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 18:15:36,803 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand 72 states. [2018-12-03 18:15:36,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:36,942 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-12-03 18:15:36,943 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 18:15:36,943 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 71 [2018-12-03 18:15:36,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:36,944 INFO L225 Difference]: With dead ends: 75 [2018-12-03 18:15:36,944 INFO L226 Difference]: Without dead ends: 74 [2018-12-03 18:15:36,946 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4830 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=5076, Invalid=6266, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 18:15:36,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-12-03 18:15:36,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2018-12-03 18:15:36,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-12-03 18:15:36,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 74 transitions. [2018-12-03 18:15:36,950 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 74 transitions. Word has length 71 [2018-12-03 18:15:36,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:36,950 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 74 transitions. [2018-12-03 18:15:36,950 INFO L481 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-12-03 18:15:36,951 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 74 transitions. [2018-12-03 18:15:36,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-12-03 18:15:36,951 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:36,951 INFO L402 BasicCegarLoop]: trace histogram [36, 35, 1, 1] [2018-12-03 18:15:36,951 INFO L423 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:36,952 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:36,952 INFO L82 PathProgramCache]: Analyzing trace with hash -714784666, now seen corresponding path program 35 times [2018-12-03 18:15:36,952 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:36,953 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:36,953 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:36,953 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:36,953 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:36,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:37,618 INFO L134 CoverageAnalysis]: Checked inductivity of 1260 backedges. 0 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:37,618 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:37,618 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:37,619 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:37,619 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:37,619 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:37,619 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 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 18:15:37,627 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:15:37,627 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:15:37,660 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-12-03 18:15:37,661 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:37,663 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:38,460 INFO L134 CoverageAnalysis]: Checked inductivity of 1260 backedges. 0 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:38,461 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:40,074 INFO L134 CoverageAnalysis]: Checked inductivity of 1260 backedges. 0 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:40,094 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:40,094 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 108 [2018-12-03 18:15:40,094 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:40,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-03 18:15:40,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-03 18:15:40,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5365, Invalid=6625, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 18:15:40,096 INFO L87 Difference]: Start difference. First operand 74 states and 74 transitions. Second operand 74 states. [2018-12-03 18:15:40,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:40,430 INFO L93 Difference]: Finished difference Result 77 states and 77 transitions. [2018-12-03 18:15:40,430 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-12-03 18:15:40,430 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 73 [2018-12-03 18:15:40,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:40,431 INFO L225 Difference]: With dead ends: 77 [2018-12-03 18:15:40,431 INFO L226 Difference]: Without dead ends: 76 [2018-12-03 18:15:40,433 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5112 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=5365, Invalid=6625, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 18:15:40,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-12-03 18:15:40,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2018-12-03 18:15:40,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-12-03 18:15:40,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2018-12-03 18:15:40,437 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 73 [2018-12-03 18:15:40,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:40,437 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2018-12-03 18:15:40,437 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-03 18:15:40,437 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2018-12-03 18:15:40,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-12-03 18:15:40,438 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:40,438 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 1, 1] [2018-12-03 18:15:40,438 INFO L423 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:40,438 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:40,439 INFO L82 PathProgramCache]: Analyzing trace with hash 286704424, now seen corresponding path program 36 times [2018-12-03 18:15:40,439 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:40,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:40,439 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:40,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:40,440 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:40,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:41,126 INFO L134 CoverageAnalysis]: Checked inductivity of 1332 backedges. 0 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:41,126 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:41,126 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:41,126 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:41,126 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:41,126 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:41,127 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 18:15:41,135 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:15:41,135 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:15:41,156 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:15:41,156 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:41,158 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:41,962 INFO L134 CoverageAnalysis]: Checked inductivity of 1332 backedges. 0 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:41,962 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:43,568 INFO L134 CoverageAnalysis]: Checked inductivity of 1332 backedges. 0 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:43,587 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:43,587 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 111 [2018-12-03 18:15:43,587 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:43,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-12-03 18:15:43,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-12-03 18:15:43,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5662, Invalid=6994, Unknown=0, NotChecked=0, Total=12656 [2018-12-03 18:15:43,590 INFO L87 Difference]: Start difference. First operand 76 states and 76 transitions. Second operand 76 states. [2018-12-03 18:15:43,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:43,736 INFO L93 Difference]: Finished difference Result 79 states and 79 transitions. [2018-12-03 18:15:43,736 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 18:15:43,737 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 75 [2018-12-03 18:15:43,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:43,738 INFO L225 Difference]: With dead ends: 79 [2018-12-03 18:15:43,738 INFO L226 Difference]: Without dead ends: 78 [2018-12-03 18:15:43,739 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5402 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=5662, Invalid=6994, Unknown=0, NotChecked=0, Total=12656 [2018-12-03 18:15:43,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-12-03 18:15:43,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-12-03 18:15:43,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-12-03 18:15:43,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 78 transitions. [2018-12-03 18:15:43,743 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 78 transitions. Word has length 75 [2018-12-03 18:15:43,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:43,743 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 78 transitions. [2018-12-03 18:15:43,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has 76 states. [2018-12-03 18:15:43,743 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 78 transitions. [2018-12-03 18:15:43,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-12-03 18:15:43,744 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:43,744 INFO L402 BasicCegarLoop]: trace histogram [38, 37, 1, 1] [2018-12-03 18:15:43,744 INFO L423 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:43,744 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:43,744 INFO L82 PathProgramCache]: Analyzing trace with hash 645045610, now seen corresponding path program 37 times [2018-12-03 18:15:43,744 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:43,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:43,745 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:43,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:43,745 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:43,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:44,872 INFO L134 CoverageAnalysis]: Checked inductivity of 1406 backedges. 0 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:44,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:44,872 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:44,872 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:44,872 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:44,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:44,873 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 18:15:44,882 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:44,882 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:15:44,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:44,902 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:45,759 INFO L134 CoverageAnalysis]: Checked inductivity of 1406 backedges. 0 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:45,759 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:47,492 INFO L134 CoverageAnalysis]: Checked inductivity of 1406 backedges. 0 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:47,511 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:47,511 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 114 [2018-12-03 18:15:47,511 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:47,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 78 states [2018-12-03 18:15:47,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2018-12-03 18:15:47,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5967, Invalid=7373, Unknown=0, NotChecked=0, Total=13340 [2018-12-03 18:15:47,514 INFO L87 Difference]: Start difference. First operand 78 states and 78 transitions. Second operand 78 states. [2018-12-03 18:15:47,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:47,673 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-12-03 18:15:47,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-12-03 18:15:47,674 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 77 [2018-12-03 18:15:47,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:47,675 INFO L225 Difference]: With dead ends: 81 [2018-12-03 18:15:47,675 INFO L226 Difference]: Without dead ends: 80 [2018-12-03 18:15:47,676 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5700 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=5967, Invalid=7373, Unknown=0, NotChecked=0, Total=13340 [2018-12-03 18:15:47,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2018-12-03 18:15:47,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2018-12-03 18:15:47,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-12-03 18:15:47,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 80 transitions. [2018-12-03 18:15:47,680 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 80 transitions. Word has length 77 [2018-12-03 18:15:47,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:47,681 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 80 transitions. [2018-12-03 18:15:47,681 INFO L481 AbstractCegarLoop]: Interpolant automaton has 78 states. [2018-12-03 18:15:47,681 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 80 transitions. [2018-12-03 18:15:47,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-12-03 18:15:47,681 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:47,682 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 1, 1] [2018-12-03 18:15:47,682 INFO L423 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:47,682 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:47,682 INFO L82 PathProgramCache]: Analyzing trace with hash 1413541676, now seen corresponding path program 38 times [2018-12-03 18:15:47,682 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:47,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:47,683 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:47,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:47,683 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:47,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:48,506 INFO L134 CoverageAnalysis]: Checked inductivity of 1482 backedges. 0 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:48,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:48,506 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:48,506 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:48,507 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:48,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:48,507 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 18:15:48,515 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:15:48,515 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:15:48,560 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-12-03 18:15:48,560 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:48,562 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:49,634 INFO L134 CoverageAnalysis]: Checked inductivity of 1482 backedges. 0 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:49,634 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:51,630 INFO L134 CoverageAnalysis]: Checked inductivity of 1482 backedges. 0 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:51,648 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:51,649 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 117 [2018-12-03 18:15:51,649 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:51,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-12-03 18:15:51,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-12-03 18:15:51,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6280, Invalid=7762, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 18:15:51,651 INFO L87 Difference]: Start difference. First operand 80 states and 80 transitions. Second operand 80 states. [2018-12-03 18:15:51,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:51,839 INFO L93 Difference]: Finished difference Result 83 states and 83 transitions. [2018-12-03 18:15:51,839 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 18:15:51,839 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 79 [2018-12-03 18:15:51,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:51,840 INFO L225 Difference]: With dead ends: 83 [2018-12-03 18:15:51,840 INFO L226 Difference]: Without dead ends: 82 [2018-12-03 18:15:51,841 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6006 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=6280, Invalid=7762, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 18:15:51,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-12-03 18:15:51,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2018-12-03 18:15:51,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-12-03 18:15:51,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 82 transitions. [2018-12-03 18:15:51,845 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 82 transitions. Word has length 79 [2018-12-03 18:15:51,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:51,845 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 82 transitions. [2018-12-03 18:15:51,845 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-12-03 18:15:51,845 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 82 transitions. [2018-12-03 18:15:51,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-12-03 18:15:51,845 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:51,846 INFO L402 BasicCegarLoop]: trace histogram [40, 39, 1, 1] [2018-12-03 18:15:51,846 INFO L423 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:51,846 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:51,846 INFO L82 PathProgramCache]: Analyzing trace with hash 1203886190, now seen corresponding path program 39 times [2018-12-03 18:15:51,846 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:51,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:51,847 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:51,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:51,847 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:51,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:52,589 INFO L134 CoverageAnalysis]: Checked inductivity of 1560 backedges. 0 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:52,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:52,589 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:52,589 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:52,589 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:52,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:52,590 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 18:15:52,598 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:15:52,598 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:15:52,621 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:15:52,621 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:52,623 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:53,572 INFO L134 CoverageAnalysis]: Checked inductivity of 1560 backedges. 0 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:53,572 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:55,812 INFO L134 CoverageAnalysis]: Checked inductivity of 1560 backedges. 0 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:55,831 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:55,831 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 120 [2018-12-03 18:15:55,831 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:55,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 82 states [2018-12-03 18:15:55,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2018-12-03 18:15:55,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6601, Invalid=8161, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 18:15:55,834 INFO L87 Difference]: Start difference. First operand 82 states and 82 transitions. Second operand 82 states. [2018-12-03 18:15:55,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:55,995 INFO L93 Difference]: Finished difference Result 85 states and 85 transitions. [2018-12-03 18:15:55,996 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-12-03 18:15:55,996 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 81 [2018-12-03 18:15:55,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:55,997 INFO L225 Difference]: With dead ends: 85 [2018-12-03 18:15:55,997 INFO L226 Difference]: Without dead ends: 84 [2018-12-03 18:15:55,999 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6320 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=6601, Invalid=8161, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 18:15:55,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-12-03 18:15:56,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2018-12-03 18:15:56,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-12-03 18:15:56,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 84 transitions. [2018-12-03 18:15:56,002 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 84 transitions. Word has length 81 [2018-12-03 18:15:56,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:56,002 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 84 transitions. [2018-12-03 18:15:56,002 INFO L481 AbstractCegarLoop]: Interpolant automaton has 82 states. [2018-12-03 18:15:56,002 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 84 transitions. [2018-12-03 18:15:56,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-12-03 18:15:56,003 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:56,003 INFO L402 BasicCegarLoop]: trace histogram [41, 40, 1, 1] [2018-12-03 18:15:56,003 INFO L423 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:56,004 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:56,004 INFO L82 PathProgramCache]: Analyzing trace with hash 1588427056, now seen corresponding path program 40 times [2018-12-03 18:15:56,004 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:56,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:56,005 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:56,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:56,005 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:56,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:56,890 INFO L134 CoverageAnalysis]: Checked inductivity of 1640 backedges. 0 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:56,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:56,891 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:56,891 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:56,891 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:56,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:56,891 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 18:15:56,899 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:56,900 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:15:56,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:56,927 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:57,945 INFO L134 CoverageAnalysis]: Checked inductivity of 1640 backedges. 0 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:57,945 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:00,217 INFO L134 CoverageAnalysis]: Checked inductivity of 1640 backedges. 0 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:00,237 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:00,238 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 123 [2018-12-03 18:16:00,238 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:00,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 84 states [2018-12-03 18:16:00,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2018-12-03 18:16:00,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6930, Invalid=8570, Unknown=0, NotChecked=0, Total=15500 [2018-12-03 18:16:00,240 INFO L87 Difference]: Start difference. First operand 84 states and 84 transitions. Second operand 84 states. [2018-12-03 18:16:00,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:00,429 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-12-03 18:16:00,429 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 18:16:00,429 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 83 [2018-12-03 18:16:00,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:00,430 INFO L225 Difference]: With dead ends: 87 [2018-12-03 18:16:00,430 INFO L226 Difference]: Without dead ends: 86 [2018-12-03 18:16:00,432 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6642 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=6930, Invalid=8570, Unknown=0, NotChecked=0, Total=15500 [2018-12-03 18:16:00,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2018-12-03 18:16:00,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2018-12-03 18:16:00,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-12-03 18:16:00,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 86 transitions. [2018-12-03 18:16:00,436 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 86 transitions. Word has length 83 [2018-12-03 18:16:00,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:00,436 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 86 transitions. [2018-12-03 18:16:00,437 INFO L481 AbstractCegarLoop]: Interpolant automaton has 84 states. [2018-12-03 18:16:00,437 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 86 transitions. [2018-12-03 18:16:00,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-12-03 18:16:00,437 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:00,437 INFO L402 BasicCegarLoop]: trace histogram [42, 41, 1, 1] [2018-12-03 18:16:00,438 INFO L423 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:00,438 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:00,438 INFO L82 PathProgramCache]: Analyzing trace with hash 1765011826, now seen corresponding path program 41 times [2018-12-03 18:16:00,438 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:00,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:00,439 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:00,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:00,439 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:00,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:01,280 INFO L134 CoverageAnalysis]: Checked inductivity of 1722 backedges. 0 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:01,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:01,281 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:01,281 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:01,281 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:01,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:01,281 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 18:16:01,290 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:01,290 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:01,330 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-12-03 18:16:01,330 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:01,332 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:02,421 INFO L134 CoverageAnalysis]: Checked inductivity of 1722 backedges. 0 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:02,422 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:04,863 INFO L134 CoverageAnalysis]: Checked inductivity of 1722 backedges. 0 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:04,881 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:04,882 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 126 [2018-12-03 18:16:04,882 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:04,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-03 18:16:04,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-03 18:16:04,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7267, Invalid=8989, Unknown=0, NotChecked=0, Total=16256 [2018-12-03 18:16:04,884 INFO L87 Difference]: Start difference. First operand 86 states and 86 transitions. Second operand 86 states. [2018-12-03 18:16:05,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:05,085 INFO L93 Difference]: Finished difference Result 89 states and 89 transitions. [2018-12-03 18:16:05,085 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-03 18:16:05,085 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 85 [2018-12-03 18:16:05,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:05,086 INFO L225 Difference]: With dead ends: 89 [2018-12-03 18:16:05,087 INFO L226 Difference]: Without dead ends: 88 [2018-12-03 18:16:05,088 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6972 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=7267, Invalid=8989, Unknown=0, NotChecked=0, Total=16256 [2018-12-03 18:16:05,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-12-03 18:16:05,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-12-03 18:16:05,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-12-03 18:16:05,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 88 transitions. [2018-12-03 18:16:05,092 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 88 transitions. Word has length 85 [2018-12-03 18:16:05,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:05,093 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 88 transitions. [2018-12-03 18:16:05,093 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-03 18:16:05,093 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 88 transitions. [2018-12-03 18:16:05,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-12-03 18:16:05,094 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:05,094 INFO L402 BasicCegarLoop]: trace histogram [43, 42, 1, 1] [2018-12-03 18:16:05,094 INFO L423 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:05,094 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:05,095 INFO L82 PathProgramCache]: Analyzing trace with hash -335716044, now seen corresponding path program 42 times [2018-12-03 18:16:05,095 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:05,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:05,096 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:05,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:05,096 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:05,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:05,994 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 0 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:05,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:05,995 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:05,995 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:05,995 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:05,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:05,995 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 18:16:06,004 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:16:06,004 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:16:06,026 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:16:06,027 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:06,029 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:07,134 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 0 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:07,134 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:10,178 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 0 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:10,198 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:10,198 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 129 [2018-12-03 18:16:10,198 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:10,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 88 states [2018-12-03 18:16:10,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2018-12-03 18:16:10,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7612, Invalid=9418, Unknown=0, NotChecked=0, Total=17030 [2018-12-03 18:16:10,201 INFO L87 Difference]: Start difference. First operand 88 states and 88 transitions. Second operand 88 states. [2018-12-03 18:16:10,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:10,405 INFO L93 Difference]: Finished difference Result 91 states and 91 transitions. [2018-12-03 18:16:10,405 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 18:16:10,406 INFO L78 Accepts]: Start accepts. Automaton has 88 states. Word has length 87 [2018-12-03 18:16:10,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:10,407 INFO L225 Difference]: With dead ends: 91 [2018-12-03 18:16:10,407 INFO L226 Difference]: Without dead ends: 90 [2018-12-03 18:16:10,409 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7310 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=7612, Invalid=9418, Unknown=0, NotChecked=0, Total=17030 [2018-12-03 18:16:10,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-12-03 18:16:10,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2018-12-03 18:16:10,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-12-03 18:16:10,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 90 transitions. [2018-12-03 18:16:10,413 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 90 transitions. Word has length 87 [2018-12-03 18:16:10,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:10,413 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 90 transitions. [2018-12-03 18:16:10,413 INFO L481 AbstractCegarLoop]: Interpolant automaton has 88 states. [2018-12-03 18:16:10,413 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 90 transitions. [2018-12-03 18:16:10,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-12-03 18:16:10,413 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:10,414 INFO L402 BasicCegarLoop]: trace histogram [44, 43, 1, 1] [2018-12-03 18:16:10,414 INFO L423 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:10,414 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:10,414 INFO L82 PathProgramCache]: Analyzing trace with hash -500569994, now seen corresponding path program 43 times [2018-12-03 18:16:10,414 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:10,415 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:10,415 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:10,415 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:10,415 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:10,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:11,790 INFO L134 CoverageAnalysis]: Checked inductivity of 1892 backedges. 0 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:11,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:11,791 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:11,791 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:11,791 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:11,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:11,791 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 18:16:11,801 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:11,801 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:16:11,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:11,827 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:12,917 INFO L134 CoverageAnalysis]: Checked inductivity of 1892 backedges. 0 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:12,917 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:15,501 INFO L134 CoverageAnalysis]: Checked inductivity of 1892 backedges. 0 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:15,529 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:15,530 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 132 [2018-12-03 18:16:15,530 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:15,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 90 states [2018-12-03 18:16:15,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2018-12-03 18:16:15,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7965, Invalid=9857, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 18:16:15,534 INFO L87 Difference]: Start difference. First operand 90 states and 90 transitions. Second operand 90 states. [2018-12-03 18:16:15,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:15,800 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-12-03 18:16:15,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-12-03 18:16:15,801 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 89 [2018-12-03 18:16:15,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:15,802 INFO L225 Difference]: With dead ends: 93 [2018-12-03 18:16:15,802 INFO L226 Difference]: Without dead ends: 92 [2018-12-03 18:16:15,804 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7656 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=7965, Invalid=9857, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 18:16:15,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-12-03 18:16:15,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2018-12-03 18:16:15,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-12-03 18:16:15,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 92 transitions. [2018-12-03 18:16:15,807 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 92 transitions. Word has length 89 [2018-12-03 18:16:15,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:15,807 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 92 transitions. [2018-12-03 18:16:15,807 INFO L481 AbstractCegarLoop]: Interpolant automaton has 90 states. [2018-12-03 18:16:15,807 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 92 transitions. [2018-12-03 18:16:15,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-12-03 18:16:15,808 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:15,808 INFO L402 BasicCegarLoop]: trace histogram [45, 44, 1, 1] [2018-12-03 18:16:15,809 INFO L423 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:15,809 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:15,809 INFO L82 PathProgramCache]: Analyzing trace with hash -11425992, now seen corresponding path program 44 times [2018-12-03 18:16:15,809 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:15,810 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:15,810 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:15,810 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:15,810 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:15,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:16,801 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:16,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:16,801 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:16,801 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:16,801 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:16,802 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:16,802 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 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 18:16:16,811 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:16,811 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:16,853 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-12-03 18:16:16,853 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:16,855 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:18,061 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:18,061 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:20,872 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:20,891 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:20,892 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 135 [2018-12-03 18:16:20,892 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:20,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-12-03 18:16:20,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-12-03 18:16:20,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8326, Invalid=10306, Unknown=0, NotChecked=0, Total=18632 [2018-12-03 18:16:20,894 INFO L87 Difference]: Start difference. First operand 92 states and 92 transitions. Second operand 92 states. [2018-12-03 18:16:21,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:21,095 INFO L93 Difference]: Finished difference Result 95 states and 95 transitions. [2018-12-03 18:16:21,096 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 18:16:21,096 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 91 [2018-12-03 18:16:21,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:21,097 INFO L225 Difference]: With dead ends: 95 [2018-12-03 18:16:21,097 INFO L226 Difference]: Without dead ends: 94 [2018-12-03 18:16:21,098 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8010 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=8326, Invalid=10306, Unknown=0, NotChecked=0, Total=18632 [2018-12-03 18:16:21,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-12-03 18:16:21,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2018-12-03 18:16:21,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-12-03 18:16:21,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 94 transitions. [2018-12-03 18:16:21,104 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 94 transitions. Word has length 91 [2018-12-03 18:16:21,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:21,104 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 94 transitions. [2018-12-03 18:16:21,104 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-12-03 18:16:21,104 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 94 transitions. [2018-12-03 18:16:21,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-12-03 18:16:21,105 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:21,105 INFO L402 BasicCegarLoop]: trace histogram [46, 45, 1, 1] [2018-12-03 18:16:21,105 INFO L423 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:21,105 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:21,106 INFO L82 PathProgramCache]: Analyzing trace with hash 1904524666, now seen corresponding path program 45 times [2018-12-03 18:16:21,106 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:21,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:21,107 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:21,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:21,107 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:21,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:22,192 INFO L134 CoverageAnalysis]: Checked inductivity of 2070 backedges. 0 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:22,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:22,192 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:22,192 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:22,192 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:22,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:22,192 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 18:16:22,202 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:16:22,202 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:16:22,242 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:16:22,243 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:22,246 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:23,513 INFO L134 CoverageAnalysis]: Checked inductivity of 2070 backedges. 0 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:23,514 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:26,407 INFO L134 CoverageAnalysis]: Checked inductivity of 2070 backedges. 0 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:26,425 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:26,426 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 138 [2018-12-03 18:16:26,426 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:26,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 94 states [2018-12-03 18:16:26,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2018-12-03 18:16:26,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8695, Invalid=10765, Unknown=0, NotChecked=0, Total=19460 [2018-12-03 18:16:26,429 INFO L87 Difference]: Start difference. First operand 94 states and 94 transitions. Second operand 94 states. [2018-12-03 18:16:26,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:26,640 INFO L93 Difference]: Finished difference Result 97 states and 97 transitions. [2018-12-03 18:16:26,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-12-03 18:16:26,640 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 93 [2018-12-03 18:16:26,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:26,642 INFO L225 Difference]: With dead ends: 97 [2018-12-03 18:16:26,642 INFO L226 Difference]: Without dead ends: 96 [2018-12-03 18:16:26,644 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8372 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=8695, Invalid=10765, Unknown=0, NotChecked=0, Total=19460 [2018-12-03 18:16:26,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-12-03 18:16:26,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2018-12-03 18:16:26,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-12-03 18:16:26,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 96 transitions. [2018-12-03 18:16:26,648 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 96 transitions. Word has length 93 [2018-12-03 18:16:26,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:26,648 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 96 transitions. [2018-12-03 18:16:26,648 INFO L481 AbstractCegarLoop]: Interpolant automaton has 94 states. [2018-12-03 18:16:26,648 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 96 transitions. [2018-12-03 18:16:26,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-12-03 18:16:26,648 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:26,649 INFO L402 BasicCegarLoop]: trace histogram [47, 46, 1, 1] [2018-12-03 18:16:26,649 INFO L423 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:26,649 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:26,649 INFO L82 PathProgramCache]: Analyzing trace with hash 592137020, now seen corresponding path program 46 times [2018-12-03 18:16:26,649 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:26,650 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:26,650 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:26,650 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:26,650 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:26,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:27,870 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:27,870 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:27,871 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:27,871 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:27,871 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:27,871 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:27,871 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 18:16:27,879 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:27,879 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:16:27,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:27,906 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:29,799 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:29,799 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:32,762 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:32,781 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:32,781 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 141 [2018-12-03 18:16:32,781 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:32,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2018-12-03 18:16:32,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2018-12-03 18:16:32,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9072, Invalid=11234, Unknown=0, NotChecked=0, Total=20306 [2018-12-03 18:16:32,786 INFO L87 Difference]: Start difference. First operand 96 states and 96 transitions. Second operand 96 states. [2018-12-03 18:16:33,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:33,030 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-12-03 18:16:33,030 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-12-03 18:16:33,030 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 95 [2018-12-03 18:16:33,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:33,031 INFO L225 Difference]: With dead ends: 99 [2018-12-03 18:16:33,031 INFO L226 Difference]: Without dead ends: 98 [2018-12-03 18:16:33,033 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8742 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=9072, Invalid=11234, Unknown=0, NotChecked=0, Total=20306 [2018-12-03 18:16:33,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2018-12-03 18:16:33,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2018-12-03 18:16:33,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-12-03 18:16:33,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 98 transitions. [2018-12-03 18:16:33,038 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 98 transitions. Word has length 95 [2018-12-03 18:16:33,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:33,038 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 98 transitions. [2018-12-03 18:16:33,038 INFO L481 AbstractCegarLoop]: Interpolant automaton has 96 states. [2018-12-03 18:16:33,039 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 98 transitions. [2018-12-03 18:16:33,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-12-03 18:16:33,039 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:33,039 INFO L402 BasicCegarLoop]: trace histogram [48, 47, 1, 1] [2018-12-03 18:16:33,039 INFO L423 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:33,040 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:33,040 INFO L82 PathProgramCache]: Analyzing trace with hash 2107994238, now seen corresponding path program 47 times [2018-12-03 18:16:33,040 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:33,041 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:33,041 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:33,041 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:33,041 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:33,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:34,097 INFO L134 CoverageAnalysis]: Checked inductivity of 2256 backedges. 0 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:34,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:34,097 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:34,098 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:34,098 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:34,098 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:34,098 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 18:16:34,108 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:34,108 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:34,151 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-12-03 18:16:34,152 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:34,154 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:35,846 INFO L134 CoverageAnalysis]: Checked inductivity of 2256 backedges. 0 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:35,846 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:38,569 INFO L134 CoverageAnalysis]: Checked inductivity of 2256 backedges. 0 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:38,588 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:38,588 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 144 [2018-12-03 18:16:38,588 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:38,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2018-12-03 18:16:38,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2018-12-03 18:16:38,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9457, Invalid=11713, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 18:16:38,591 INFO L87 Difference]: Start difference. First operand 98 states and 98 transitions. Second operand 98 states. [2018-12-03 18:16:38,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:38,795 INFO L93 Difference]: Finished difference Result 101 states and 101 transitions. [2018-12-03 18:16:38,796 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-12-03 18:16:38,796 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 97 [2018-12-03 18:16:38,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:38,797 INFO L225 Difference]: With dead ends: 101 [2018-12-03 18:16:38,797 INFO L226 Difference]: Without dead ends: 100 [2018-12-03 18:16:38,798 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9120 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=9457, Invalid=11713, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 18:16:38,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-12-03 18:16:38,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2018-12-03 18:16:38,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-12-03 18:16:38,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 100 transitions. [2018-12-03 18:16:38,803 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 100 transitions. Word has length 97 [2018-12-03 18:16:38,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:38,804 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 100 transitions. [2018-12-03 18:16:38,804 INFO L481 AbstractCegarLoop]: Interpolant automaton has 98 states. [2018-12-03 18:16:38,804 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 100 transitions. [2018-12-03 18:16:38,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-12-03 18:16:38,805 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:38,805 INFO L402 BasicCegarLoop]: trace histogram [49, 48, 1, 1] [2018-12-03 18:16:38,805 INFO L423 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:38,805 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:38,805 INFO L82 PathProgramCache]: Analyzing trace with hash -1442099904, now seen corresponding path program 48 times [2018-12-03 18:16:38,805 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:38,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:38,806 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:38,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:38,806 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:38,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:39,943 INFO L134 CoverageAnalysis]: Checked inductivity of 2352 backedges. 0 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:39,943 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:39,944 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:39,944 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:39,944 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:39,944 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:39,944 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 18:16:39,952 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:16:39,952 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:16:39,979 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:16:39,979 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:39,982 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:41,603 INFO L134 CoverageAnalysis]: Checked inductivity of 2352 backedges. 0 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:41,604 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:44,496 INFO L134 CoverageAnalysis]: Checked inductivity of 2352 backedges. 0 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:44,518 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:44,518 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 147 [2018-12-03 18:16:44,518 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:44,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 100 states [2018-12-03 18:16:44,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2018-12-03 18:16:44,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9850, Invalid=12202, Unknown=0, NotChecked=0, Total=22052 [2018-12-03 18:16:44,521 INFO L87 Difference]: Start difference. First operand 100 states and 100 transitions. Second operand 100 states. [2018-12-03 18:16:44,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:44,719 INFO L93 Difference]: Finished difference Result 103 states and 103 transitions. [2018-12-03 18:16:44,720 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-12-03 18:16:44,720 INFO L78 Accepts]: Start accepts. Automaton has 100 states. Word has length 99 [2018-12-03 18:16:44,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:44,721 INFO L225 Difference]: With dead ends: 103 [2018-12-03 18:16:44,721 INFO L226 Difference]: Without dead ends: 102 [2018-12-03 18:16:44,722 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9506 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=9850, Invalid=12202, Unknown=0, NotChecked=0, Total=22052 [2018-12-03 18:16:44,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-12-03 18:16:44,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 102. [2018-12-03 18:16:44,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-12-03 18:16:44,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 102 transitions. [2018-12-03 18:16:44,725 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 102 transitions. Word has length 99 [2018-12-03 18:16:44,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:44,726 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 102 transitions. [2018-12-03 18:16:44,726 INFO L481 AbstractCegarLoop]: Interpolant automaton has 100 states. [2018-12-03 18:16:44,726 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 102 transitions. [2018-12-03 18:16:44,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-12-03 18:16:44,726 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:44,726 INFO L402 BasicCegarLoop]: trace histogram [50, 49, 1, 1] [2018-12-03 18:16:44,726 INFO L423 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:44,727 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:44,727 INFO L82 PathProgramCache]: Analyzing trace with hash 1416429954, now seen corresponding path program 49 times [2018-12-03 18:16:44,727 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:44,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:44,728 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:44,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:44,728 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:44,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:46,147 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 0 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:46,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:46,148 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:46,148 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:46,148 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:46,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:46,148 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 18:16:46,158 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:46,158 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:16:46,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:46,184 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:48,479 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 0 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:48,479 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:51,966 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 0 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:51,986 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:51,987 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 150 [2018-12-03 18:16:51,987 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:51,987 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2018-12-03 18:16:51,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2018-12-03 18:16:51,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10251, Invalid=12701, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 18:16:51,989 INFO L87 Difference]: Start difference. First operand 102 states and 102 transitions. Second operand 102 states. [2018-12-03 18:16:52,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:52,242 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-12-03 18:16:52,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-12-03 18:16:52,242 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 101 [2018-12-03 18:16:52,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:52,244 INFO L225 Difference]: With dead ends: 105 [2018-12-03 18:16:52,244 INFO L226 Difference]: Without dead ends: 104 [2018-12-03 18:16:52,245 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9900 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=10251, Invalid=12701, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 18:16:52,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2018-12-03 18:16:52,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2018-12-03 18:16:52,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2018-12-03 18:16:52,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 104 transitions. [2018-12-03 18:16:52,250 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 104 transitions. Word has length 101 [2018-12-03 18:16:52,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:52,251 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 104 transitions. [2018-12-03 18:16:52,251 INFO L481 AbstractCegarLoop]: Interpolant automaton has 102 states. [2018-12-03 18:16:52,251 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 104 transitions. [2018-12-03 18:16:52,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-12-03 18:16:52,252 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:52,252 INFO L402 BasicCegarLoop]: trace histogram [51, 50, 1, 1] [2018-12-03 18:16:52,252 INFO L423 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:52,252 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:52,252 INFO L82 PathProgramCache]: Analyzing trace with hash -315445948, now seen corresponding path program 50 times [2018-12-03 18:16:52,252 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:52,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:52,253 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:52,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:52,254 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:52,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:53,831 INFO L134 CoverageAnalysis]: Checked inductivity of 2550 backedges. 0 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:53,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:53,831 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:53,832 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:53,832 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:53,832 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:53,832 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 18:16:53,842 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:53,842 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:53,945 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2018-12-03 18:16:53,945 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:53,948 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:55,441 INFO L134 CoverageAnalysis]: Checked inductivity of 2550 backedges. 0 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:55,442 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:58,820 INFO L134 CoverageAnalysis]: Checked inductivity of 2550 backedges. 0 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:58,839 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:58,839 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 153 [2018-12-03 18:16:58,839 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:58,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2018-12-03 18:16:58,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2018-12-03 18:16:58,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10660, Invalid=13210, Unknown=0, NotChecked=0, Total=23870 [2018-12-03 18:16:58,844 INFO L87 Difference]: Start difference. First operand 104 states and 104 transitions. Second operand 104 states. [2018-12-03 18:16:59,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:59,940 INFO L93 Difference]: Finished difference Result 107 states and 107 transitions. [2018-12-03 18:16:59,940 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 18:16:59,941 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 103 [2018-12-03 18:16:59,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:59,942 INFO L225 Difference]: With dead ends: 107 [2018-12-03 18:16:59,942 INFO L226 Difference]: Without dead ends: 106 [2018-12-03 18:16:59,943 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10302 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=10660, Invalid=13210, Unknown=0, NotChecked=0, Total=23870 [2018-12-03 18:16:59,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-12-03 18:16:59,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2018-12-03 18:16:59,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-12-03 18:16:59,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 106 transitions. [2018-12-03 18:16:59,948 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 106 transitions. Word has length 103 [2018-12-03 18:16:59,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:59,948 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 106 transitions. [2018-12-03 18:16:59,948 INFO L481 AbstractCegarLoop]: Interpolant automaton has 104 states. [2018-12-03 18:16:59,948 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 106 transitions. [2018-12-03 18:16:59,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-12-03 18:16:59,949 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:59,949 INFO L402 BasicCegarLoop]: trace histogram [52, 51, 1, 1] [2018-12-03 18:16:59,949 INFO L423 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:59,949 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:59,950 INFO L82 PathProgramCache]: Analyzing trace with hash 1799123078, now seen corresponding path program 51 times [2018-12-03 18:16:59,950 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:59,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:59,950 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:59,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:59,951 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:59,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:01,661 INFO L134 CoverageAnalysis]: Checked inductivity of 2652 backedges. 0 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:01,661 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:01,661 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:01,661 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:01,662 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:01,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:01,662 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:17:01,671 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:17:01,671 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:17:01,699 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:17:01,699 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:01,701 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:03,174 INFO L134 CoverageAnalysis]: Checked inductivity of 2652 backedges. 0 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:03,174 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:06,594 INFO L134 CoverageAnalysis]: Checked inductivity of 2652 backedges. 0 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:06,613 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:06,613 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 156 [2018-12-03 18:17:06,613 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:06,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 106 states [2018-12-03 18:17:06,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2018-12-03 18:17:06,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11077, Invalid=13729, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 18:17:06,616 INFO L87 Difference]: Start difference. First operand 106 states and 106 transitions. Second operand 106 states. [2018-12-03 18:17:06,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:06,854 INFO L93 Difference]: Finished difference Result 109 states and 109 transitions. [2018-12-03 18:17:06,854 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-03 18:17:06,854 INFO L78 Accepts]: Start accepts. Automaton has 106 states. Word has length 105 [2018-12-03 18:17:06,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:06,855 INFO L225 Difference]: With dead ends: 109 [2018-12-03 18:17:06,855 INFO L226 Difference]: Without dead ends: 108 [2018-12-03 18:17:06,856 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10712 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=11077, Invalid=13729, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 18:17:06,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2018-12-03 18:17:06,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2018-12-03 18:17:06,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-12-03 18:17:06,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2018-12-03 18:17:06,862 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 105 [2018-12-03 18:17:06,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:06,862 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2018-12-03 18:17:06,862 INFO L481 AbstractCegarLoop]: Interpolant automaton has 106 states. [2018-12-03 18:17:06,862 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2018-12-03 18:17:06,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-12-03 18:17:06,863 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:06,863 INFO L402 BasicCegarLoop]: trace histogram [53, 52, 1, 1] [2018-12-03 18:17:06,863 INFO L423 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:06,863 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:06,863 INFO L82 PathProgramCache]: Analyzing trace with hash -1914541240, now seen corresponding path program 52 times [2018-12-03 18:17:06,864 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:06,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:06,864 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:06,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:06,865 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:06,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:08,317 INFO L134 CoverageAnalysis]: Checked inductivity of 2756 backedges. 0 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:08,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:08,317 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:08,317 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:08,317 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:08,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:08,318 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 18:17:08,326 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:08,326 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:17:08,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:08,366 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:10,163 INFO L134 CoverageAnalysis]: Checked inductivity of 2756 backedges. 0 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:10,164 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:13,748 INFO L134 CoverageAnalysis]: Checked inductivity of 2756 backedges. 0 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:13,767 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:13,767 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 159 [2018-12-03 18:17:13,767 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:13,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 108 states [2018-12-03 18:17:13,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2018-12-03 18:17:13,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11502, Invalid=14258, Unknown=0, NotChecked=0, Total=25760 [2018-12-03 18:17:13,769 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 108 states. [2018-12-03 18:17:14,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:14,037 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-12-03 18:17:14,037 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 18:17:14,037 INFO L78 Accepts]: Start accepts. Automaton has 108 states. Word has length 107 [2018-12-03 18:17:14,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:14,038 INFO L225 Difference]: With dead ends: 111 [2018-12-03 18:17:14,038 INFO L226 Difference]: Without dead ends: 110 [2018-12-03 18:17:14,040 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11130 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=11502, Invalid=14258, Unknown=0, NotChecked=0, Total=25760 [2018-12-03 18:17:14,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2018-12-03 18:17:14,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2018-12-03 18:17:14,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-12-03 18:17:14,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 110 transitions. [2018-12-03 18:17:14,044 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 110 transitions. Word has length 107 [2018-12-03 18:17:14,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:14,044 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 110 transitions. [2018-12-03 18:17:14,044 INFO L481 AbstractCegarLoop]: Interpolant automaton has 108 states. [2018-12-03 18:17:14,045 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 110 transitions. [2018-12-03 18:17:14,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-12-03 18:17:14,045 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:14,045 INFO L402 BasicCegarLoop]: trace histogram [54, 53, 1, 1] [2018-12-03 18:17:14,046 INFO L423 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:14,046 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:14,046 INFO L82 PathProgramCache]: Analyzing trace with hash -1628127862, now seen corresponding path program 53 times [2018-12-03 18:17:14,046 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:14,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:14,047 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:14,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:14,047 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:14,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:15,744 INFO L134 CoverageAnalysis]: Checked inductivity of 2862 backedges. 0 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:15,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:15,745 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:15,745 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:15,745 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:15,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:15,745 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 18:17:15,754 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:17:15,754 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:17:15,805 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2018-12-03 18:17:15,806 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:15,808 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:17,609 INFO L134 CoverageAnalysis]: Checked inductivity of 2862 backedges. 0 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:17,610 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:21,039 INFO L134 CoverageAnalysis]: Checked inductivity of 2862 backedges. 0 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:21,059 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:21,059 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 162 [2018-12-03 18:17:21,060 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:21,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2018-12-03 18:17:21,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2018-12-03 18:17:21,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11935, Invalid=14797, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 18:17:21,062 INFO L87 Difference]: Start difference. First operand 110 states and 110 transitions. Second operand 110 states. [2018-12-03 18:17:21,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:21,328 INFO L93 Difference]: Finished difference Result 113 states and 113 transitions. [2018-12-03 18:17:21,328 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-12-03 18:17:21,328 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 109 [2018-12-03 18:17:21,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:21,329 INFO L225 Difference]: With dead ends: 113 [2018-12-03 18:17:21,329 INFO L226 Difference]: Without dead ends: 112 [2018-12-03 18:17:21,330 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11556 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=11935, Invalid=14797, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 18:17:21,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-12-03 18:17:21,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2018-12-03 18:17:21,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-12-03 18:17:21,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 112 transitions. [2018-12-03 18:17:21,333 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 112 transitions. Word has length 109 [2018-12-03 18:17:21,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:21,333 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 112 transitions. [2018-12-03 18:17:21,334 INFO L481 AbstractCegarLoop]: Interpolant automaton has 110 states. [2018-12-03 18:17:21,334 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 112 transitions. [2018-12-03 18:17:21,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-12-03 18:17:21,334 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:21,334 INFO L402 BasicCegarLoop]: trace histogram [55, 54, 1, 1] [2018-12-03 18:17:21,334 INFO L423 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:21,334 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:21,335 INFO L82 PathProgramCache]: Analyzing trace with hash -1262778548, now seen corresponding path program 54 times [2018-12-03 18:17:21,335 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:21,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:21,335 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:21,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:21,335 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:21,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:23,128 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 0 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:23,128 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:23,128 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:23,128 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:23,129 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:23,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:23,129 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:17:23,137 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:17:23,137 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:17:23,168 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:17:23,169 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:23,171 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:24,813 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 0 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:24,813 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:28,583 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 0 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:28,603 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:28,603 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 165 [2018-12-03 18:17:28,603 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:28,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 112 states [2018-12-03 18:17:28,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2018-12-03 18:17:28,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12376, Invalid=15346, Unknown=0, NotChecked=0, Total=27722 [2018-12-03 18:17:28,606 INFO L87 Difference]: Start difference. First operand 112 states and 112 transitions. Second operand 112 states. [2018-12-03 18:17:29,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:29,626 INFO L93 Difference]: Finished difference Result 115 states and 115 transitions. [2018-12-03 18:17:29,626 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 18:17:29,626 INFO L78 Accepts]: Start accepts. Automaton has 112 states. Word has length 111 [2018-12-03 18:17:29,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:29,627 INFO L225 Difference]: With dead ends: 115 [2018-12-03 18:17:29,627 INFO L226 Difference]: Without dead ends: 114 [2018-12-03 18:17:29,628 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11990 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=12376, Invalid=15346, Unknown=0, NotChecked=0, Total=27722 [2018-12-03 18:17:29,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-12-03 18:17:29,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2018-12-03 18:17:29,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-12-03 18:17:29,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 114 transitions. [2018-12-03 18:17:29,633 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 114 transitions. Word has length 111 [2018-12-03 18:17:29,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:29,633 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 114 transitions. [2018-12-03 18:17:29,633 INFO L481 AbstractCegarLoop]: Interpolant automaton has 112 states. [2018-12-03 18:17:29,633 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 114 transitions. [2018-12-03 18:17:29,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-12-03 18:17:29,634 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:29,634 INFO L402 BasicCegarLoop]: trace histogram [56, 55, 1, 1] [2018-12-03 18:17:29,634 INFO L423 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:29,635 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:29,635 INFO L82 PathProgramCache]: Analyzing trace with hash 1945561230, now seen corresponding path program 55 times [2018-12-03 18:17:29,635 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:29,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:29,636 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:29,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:29,636 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:29,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:30,987 INFO L134 CoverageAnalysis]: Checked inductivity of 3080 backedges. 0 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:30,988 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:30,988 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:30,988 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:30,988 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:30,988 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:30,988 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 18:17:30,997 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:30,997 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:17:31,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:31,028 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:33,101 INFO L134 CoverageAnalysis]: Checked inductivity of 3080 backedges. 0 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:33,101 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:37,113 INFO L134 CoverageAnalysis]: Checked inductivity of 3080 backedges. 0 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:37,132 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:37,133 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 168 [2018-12-03 18:17:37,133 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:37,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 114 states [2018-12-03 18:17:37,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2018-12-03 18:17:37,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12825, Invalid=15905, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 18:17:37,136 INFO L87 Difference]: Start difference. First operand 114 states and 114 transitions. Second operand 114 states. [2018-12-03 18:17:37,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:37,405 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-12-03 18:17:37,405 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-12-03 18:17:37,406 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 113 [2018-12-03 18:17:37,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:37,407 INFO L225 Difference]: With dead ends: 117 [2018-12-03 18:17:37,407 INFO L226 Difference]: Without dead ends: 116 [2018-12-03 18:17:37,408 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12432 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=12825, Invalid=15905, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 18:17:37,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2018-12-03 18:17:37,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2018-12-03 18:17:37,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2018-12-03 18:17:37,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 116 transitions. [2018-12-03 18:17:37,413 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 116 transitions. Word has length 113 [2018-12-03 18:17:37,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:37,413 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 116 transitions. [2018-12-03 18:17:37,413 INFO L481 AbstractCegarLoop]: Interpolant automaton has 114 states. [2018-12-03 18:17:37,413 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 116 transitions. [2018-12-03 18:17:37,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-12-03 18:17:37,414 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:37,414 INFO L402 BasicCegarLoop]: trace histogram [57, 56, 1, 1] [2018-12-03 18:17:37,414 INFO L423 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:37,415 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:37,415 INFO L82 PathProgramCache]: Analyzing trace with hash 1373569360, now seen corresponding path program 56 times [2018-12-03 18:17:37,415 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:37,415 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:37,416 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:37,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:37,416 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:37,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:40,679 INFO L134 CoverageAnalysis]: Checked inductivity of 3192 backedges. 0 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:40,680 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:40,680 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:40,680 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:40,680 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:40,680 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:40,680 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 18:17:40,689 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:17:40,689 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:17:40,742 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2018-12-03 18:17:40,743 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:40,745 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:42,740 INFO L134 CoverageAnalysis]: Checked inductivity of 3192 backedges. 0 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:42,741 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:46,517 INFO L134 CoverageAnalysis]: Checked inductivity of 3192 backedges. 0 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:46,536 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:46,536 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 171 [2018-12-03 18:17:46,536 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:46,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2018-12-03 18:17:46,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2018-12-03 18:17:46,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13282, Invalid=16474, Unknown=0, NotChecked=0, Total=29756 [2018-12-03 18:17:46,538 INFO L87 Difference]: Start difference. First operand 116 states and 116 transitions. Second operand 116 states. [2018-12-03 18:17:46,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:46,841 INFO L93 Difference]: Finished difference Result 119 states and 119 transitions. [2018-12-03 18:17:46,842 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 18:17:46,842 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 115 [2018-12-03 18:17:46,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:46,843 INFO L225 Difference]: With dead ends: 119 [2018-12-03 18:17:46,843 INFO L226 Difference]: Without dead ends: 118 [2018-12-03 18:17:46,844 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12882 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=13282, Invalid=16474, Unknown=0, NotChecked=0, Total=29756 [2018-12-03 18:17:46,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-12-03 18:17:46,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2018-12-03 18:17:46,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-12-03 18:17:46,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 118 transitions. [2018-12-03 18:17:46,847 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 118 transitions. Word has length 115 [2018-12-03 18:17:46,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:46,847 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 118 transitions. [2018-12-03 18:17:46,847 INFO L481 AbstractCegarLoop]: Interpolant automaton has 116 states. [2018-12-03 18:17:46,847 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 118 transitions. [2018-12-03 18:17:46,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-12-03 18:17:46,848 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:46,848 INFO L402 BasicCegarLoop]: trace histogram [58, 57, 1, 1] [2018-12-03 18:17:46,848 INFO L423 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:46,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:46,848 INFO L82 PathProgramCache]: Analyzing trace with hash 1445196178, now seen corresponding path program 57 times [2018-12-03 18:17:46,849 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:46,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:46,849 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:46,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:46,849 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:46,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:48,499 INFO L134 CoverageAnalysis]: Checked inductivity of 3306 backedges. 0 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:48,499 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:48,499 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:48,499 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:48,499 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:48,499 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:48,499 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 18:17:48,507 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:17:48,508 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:17:48,541 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:17:48,541 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:48,544 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:50,485 INFO L134 CoverageAnalysis]: Checked inductivity of 3306 backedges. 0 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:50,485 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:54,667 INFO L134 CoverageAnalysis]: Checked inductivity of 3306 backedges. 0 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:54,685 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:54,686 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 174 [2018-12-03 18:17:54,686 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:54,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 118 states [2018-12-03 18:17:54,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2018-12-03 18:17:54,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13747, Invalid=17053, Unknown=0, NotChecked=0, Total=30800 [2018-12-03 18:17:54,688 INFO L87 Difference]: Start difference. First operand 118 states and 118 transitions. Second operand 118 states. [2018-12-03 18:17:54,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:54,965 INFO L93 Difference]: Finished difference Result 121 states and 121 transitions. [2018-12-03 18:17:54,965 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-12-03 18:17:54,965 INFO L78 Accepts]: Start accepts. Automaton has 118 states. Word has length 117 [2018-12-03 18:17:54,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:54,966 INFO L225 Difference]: With dead ends: 121 [2018-12-03 18:17:54,966 INFO L226 Difference]: Without dead ends: 120 [2018-12-03 18:17:54,967 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13340 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=13747, Invalid=17053, Unknown=0, NotChecked=0, Total=30800 [2018-12-03 18:17:54,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-12-03 18:17:54,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2018-12-03 18:17:54,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-12-03 18:17:54,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 120 transitions. [2018-12-03 18:17:54,972 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 120 transitions. Word has length 117 [2018-12-03 18:17:54,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:54,972 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 120 transitions. [2018-12-03 18:17:54,972 INFO L481 AbstractCegarLoop]: Interpolant automaton has 118 states. [2018-12-03 18:17:54,972 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 120 transitions. [2018-12-03 18:17:54,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-12-03 18:17:54,973 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:54,973 INFO L402 BasicCegarLoop]: trace histogram [59, 58, 1, 1] [2018-12-03 18:17:54,973 INFO L423 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:54,974 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:54,974 INFO L82 PathProgramCache]: Analyzing trace with hash 1559091540, now seen corresponding path program 58 times [2018-12-03 18:17:54,974 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:54,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:54,975 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:54,975 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:54,975 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:54,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:56,454 INFO L134 CoverageAnalysis]: Checked inductivity of 3422 backedges. 0 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:56,454 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:56,454 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:56,455 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:56,455 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:56,455 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:56,455 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 18:17:56,467 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:56,467 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:17:56,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:56,498 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:58,630 INFO L134 CoverageAnalysis]: Checked inductivity of 3422 backedges. 0 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:58,630 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:02,945 INFO L134 CoverageAnalysis]: Checked inductivity of 3422 backedges. 0 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:02,965 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:02,965 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 177 [2018-12-03 18:18:02,965 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:02,966 INFO L459 AbstractCegarLoop]: Interpolant automaton has 120 states [2018-12-03 18:18:02,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2018-12-03 18:18:02,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14220, Invalid=17642, Unknown=0, NotChecked=0, Total=31862 [2018-12-03 18:18:02,968 INFO L87 Difference]: Start difference. First operand 120 states and 120 transitions. Second operand 120 states. [2018-12-03 18:18:03,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:03,226 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-12-03 18:18:03,227 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-12-03 18:18:03,227 INFO L78 Accepts]: Start accepts. Automaton has 120 states. Word has length 119 [2018-12-03 18:18:03,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:03,228 INFO L225 Difference]: With dead ends: 123 [2018-12-03 18:18:03,228 INFO L226 Difference]: Without dead ends: 122 [2018-12-03 18:18:03,229 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13806 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=14220, Invalid=17642, Unknown=0, NotChecked=0, Total=31862 [2018-12-03 18:18:03,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2018-12-03 18:18:03,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2018-12-03 18:18:03,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-12-03 18:18:03,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 122 transitions. [2018-12-03 18:18:03,234 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 122 transitions. Word has length 119 [2018-12-03 18:18:03,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:03,234 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 122 transitions. [2018-12-03 18:18:03,235 INFO L481 AbstractCegarLoop]: Interpolant automaton has 120 states. [2018-12-03 18:18:03,235 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 122 transitions. [2018-12-03 18:18:03,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-12-03 18:18:03,235 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:03,236 INFO L402 BasicCegarLoop]: trace histogram [60, 59, 1, 1] [2018-12-03 18:18:03,236 INFO L423 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:03,236 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:03,236 INFO L82 PathProgramCache]: Analyzing trace with hash -656615274, now seen corresponding path program 59 times [2018-12-03 18:18:03,236 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:03,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:03,237 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:18:03,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:03,237 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:03,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:05,578 INFO L134 CoverageAnalysis]: Checked inductivity of 3540 backedges. 0 proven. 3540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:05,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:05,579 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:05,579 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:05,579 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:05,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:05,579 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 18:18:05,589 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:18:05,589 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:18:05,649 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2018-12-03 18:18:05,650 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:18:05,652 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:07,896 INFO L134 CoverageAnalysis]: Checked inductivity of 3540 backedges. 0 proven. 3540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:07,897 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:12,110 INFO L134 CoverageAnalysis]: Checked inductivity of 3540 backedges. 0 proven. 3540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:12,129 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:12,129 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 180 [2018-12-03 18:18:12,129 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:12,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2018-12-03 18:18:12,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2018-12-03 18:18:12,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14701, Invalid=18241, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 18:18:12,132 INFO L87 Difference]: Start difference. First operand 122 states and 122 transitions. Second operand 122 states. [2018-12-03 18:18:12,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:12,390 INFO L93 Difference]: Finished difference Result 125 states and 125 transitions. [2018-12-03 18:18:12,391 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-12-03 18:18:12,391 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 121 [2018-12-03 18:18:12,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:12,392 INFO L225 Difference]: With dead ends: 125 [2018-12-03 18:18:12,392 INFO L226 Difference]: Without dead ends: 124 [2018-12-03 18:18:12,393 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14280 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=14701, Invalid=18241, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 18:18:12,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-03 18:18:12,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-12-03 18:18:12,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-12-03 18:18:12,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2018-12-03 18:18:12,397 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 121 [2018-12-03 18:18:12,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:12,397 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2018-12-03 18:18:12,398 INFO L481 AbstractCegarLoop]: Interpolant automaton has 122 states. [2018-12-03 18:18:12,398 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2018-12-03 18:18:12,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-12-03 18:18:12,398 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:12,398 INFO L402 BasicCegarLoop]: trace histogram [61, 60, 1, 1] [2018-12-03 18:18:12,398 INFO L423 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:12,398 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:12,399 INFO L82 PathProgramCache]: Analyzing trace with hash 352915288, now seen corresponding path program 60 times [2018-12-03 18:18:12,399 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:12,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:12,399 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:18:12,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:12,400 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:12,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:14,290 INFO L134 CoverageAnalysis]: Checked inductivity of 3660 backedges. 0 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:14,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:14,290 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:14,291 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:14,291 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:14,291 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:14,291 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:18:14,301 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:18:14,301 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:18:14,335 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:18:14,335 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:18:14,337 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:16,348 INFO L134 CoverageAnalysis]: Checked inductivity of 3660 backedges. 0 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:16,348 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:20,958 INFO L134 CoverageAnalysis]: Checked inductivity of 3660 backedges. 0 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:20,977 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:20,977 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 183 [2018-12-03 18:18:20,977 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:20,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 124 states [2018-12-03 18:18:20,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2018-12-03 18:18:20,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15190, Invalid=18850, Unknown=0, NotChecked=0, Total=34040 [2018-12-03 18:18:20,980 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 124 states. [2018-12-03 18:18:21,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:21,252 INFO L93 Difference]: Finished difference Result 127 states and 127 transitions. [2018-12-03 18:18:21,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 18:18:21,252 INFO L78 Accepts]: Start accepts. Automaton has 124 states. Word has length 123 [2018-12-03 18:18:21,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:21,253 INFO L225 Difference]: With dead ends: 127 [2018-12-03 18:18:21,253 INFO L226 Difference]: Without dead ends: 126 [2018-12-03 18:18:21,254 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14762 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=15190, Invalid=18850, Unknown=0, NotChecked=0, Total=34040 [2018-12-03 18:18:21,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-12-03 18:18:21,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2018-12-03 18:18:21,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-12-03 18:18:21,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 126 transitions. [2018-12-03 18:18:21,257 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 126 transitions. Word has length 123 [2018-12-03 18:18:21,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:21,258 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 126 transitions. [2018-12-03 18:18:21,258 INFO L481 AbstractCegarLoop]: Interpolant automaton has 124 states. [2018-12-03 18:18:21,258 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 126 transitions. [2018-12-03 18:18:21,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-12-03 18:18:21,258 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:21,258 INFO L402 BasicCegarLoop]: trace histogram [62, 61, 1, 1] [2018-12-03 18:18:21,258 INFO L423 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:21,259 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:21,259 INFO L82 PathProgramCache]: Analyzing trace with hash -150823526, now seen corresponding path program 61 times [2018-12-03 18:18:21,259 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:21,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:21,259 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:18:21,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:21,260 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:21,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:23,105 INFO L134 CoverageAnalysis]: Checked inductivity of 3782 backedges. 0 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:23,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:23,105 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:23,105 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:23,105 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:23,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:23,106 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 18:18:23,114 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:18:23,114 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:18:23,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:23,145 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:25,194 INFO L134 CoverageAnalysis]: Checked inductivity of 3782 backedges. 0 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:25,194 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:29,913 INFO L134 CoverageAnalysis]: Checked inductivity of 3782 backedges. 0 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:29,932 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:29,932 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 186 [2018-12-03 18:18:29,932 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:29,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 126 states [2018-12-03 18:18:29,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2018-12-03 18:18:29,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15687, Invalid=19469, Unknown=0, NotChecked=0, Total=35156 [2018-12-03 18:18:29,935 INFO L87 Difference]: Start difference. First operand 126 states and 126 transitions. Second operand 126 states. [2018-12-03 18:18:30,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:30,221 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-12-03 18:18:30,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-12-03 18:18:30,222 INFO L78 Accepts]: Start accepts. Automaton has 126 states. Word has length 125 [2018-12-03 18:18:30,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:30,223 INFO L225 Difference]: With dead ends: 129 [2018-12-03 18:18:30,223 INFO L226 Difference]: Without dead ends: 128 [2018-12-03 18:18:30,224 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15252 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=15687, Invalid=19469, Unknown=0, NotChecked=0, Total=35156 [2018-12-03 18:18:30,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-12-03 18:18:30,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 128. [2018-12-03 18:18:30,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-12-03 18:18:30,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 128 transitions. [2018-12-03 18:18:30,228 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 128 transitions. Word has length 125 [2018-12-03 18:18:30,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:30,229 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 128 transitions. [2018-12-03 18:18:30,229 INFO L481 AbstractCegarLoop]: Interpolant automaton has 126 states. [2018-12-03 18:18:30,229 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 128 transitions. [2018-12-03 18:18:30,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-12-03 18:18:30,229 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:30,229 INFO L402 BasicCegarLoop]: trace histogram [63, 62, 1, 1] [2018-12-03 18:18:30,230 INFO L423 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:30,230 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:30,230 INFO L82 PathProgramCache]: Analyzing trace with hash 1087480668, now seen corresponding path program 62 times [2018-12-03 18:18:30,230 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:30,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:30,231 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:18:30,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:30,231 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:30,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:31,925 INFO L134 CoverageAnalysis]: Checked inductivity of 3906 backedges. 0 proven. 3906 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:31,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:31,926 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:31,926 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:31,926 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:31,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:31,926 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 18:18:31,935 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:18:31,935 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:18:31,998 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 63 check-sat command(s) [2018-12-03 18:18:31,999 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:18:32,001 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:34,349 INFO L134 CoverageAnalysis]: Checked inductivity of 3906 backedges. 0 proven. 3906 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:34,349 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:39,312 INFO L134 CoverageAnalysis]: Checked inductivity of 3906 backedges. 0 proven. 3906 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:39,330 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:39,331 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 189 [2018-12-03 18:18:39,331 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:39,331 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2018-12-03 18:18:39,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2018-12-03 18:18:39,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16192, Invalid=20098, Unknown=0, NotChecked=0, Total=36290 [2018-12-03 18:18:39,334 INFO L87 Difference]: Start difference. First operand 128 states and 128 transitions. Second operand 128 states. [2018-12-03 18:18:39,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:39,635 INFO L93 Difference]: Finished difference Result 131 states and 131 transitions. [2018-12-03 18:18:39,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 18:18:39,635 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 127 [2018-12-03 18:18:39,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:39,636 INFO L225 Difference]: With dead ends: 131 [2018-12-03 18:18:39,636 INFO L226 Difference]: Without dead ends: 130 [2018-12-03 18:18:39,638 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15750 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=16192, Invalid=20098, Unknown=0, NotChecked=0, Total=36290 [2018-12-03 18:18:39,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-12-03 18:18:39,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2018-12-03 18:18:39,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-12-03 18:18:39,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 130 transitions. [2018-12-03 18:18:39,641 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 130 transitions. Word has length 127 [2018-12-03 18:18:39,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:39,642 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 130 transitions. [2018-12-03 18:18:39,642 INFO L481 AbstractCegarLoop]: Interpolant automaton has 128 states. [2018-12-03 18:18:39,642 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 130 transitions. [2018-12-03 18:18:39,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-12-03 18:18:39,642 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:39,642 INFO L402 BasicCegarLoop]: trace histogram [64, 63, 1, 1] [2018-12-03 18:18:39,643 INFO L423 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:39,643 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:39,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1391870110, now seen corresponding path program 63 times [2018-12-03 18:18:39,643 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:39,644 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:39,644 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:18:39,644 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:39,644 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:39,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:41,380 INFO L134 CoverageAnalysis]: Checked inductivity of 4032 backedges. 0 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:41,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:41,380 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:41,380 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:41,380 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:41,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:41,381 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 18:18:41,398 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:18:41,398 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:18:41,433 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:18:41,433 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:18:41,436 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:43,909 INFO L134 CoverageAnalysis]: Checked inductivity of 4032 backedges. 0 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:43,910 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:49,001 INFO L134 CoverageAnalysis]: Checked inductivity of 4032 backedges. 0 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:49,019 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:49,020 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 192 [2018-12-03 18:18:49,020 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:49,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 130 states [2018-12-03 18:18:49,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2018-12-03 18:18:49,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16705, Invalid=20737, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 18:18:49,024 INFO L87 Difference]: Start difference. First operand 130 states and 130 transitions. Second operand 130 states. [2018-12-03 18:18:49,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:49,366 INFO L93 Difference]: Finished difference Result 133 states and 133 transitions. [2018-12-03 18:18:49,367 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-12-03 18:18:49,367 INFO L78 Accepts]: Start accepts. Automaton has 130 states. Word has length 129 [2018-12-03 18:18:49,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:49,368 INFO L225 Difference]: With dead ends: 133 [2018-12-03 18:18:49,368 INFO L226 Difference]: Without dead ends: 132 [2018-12-03 18:18:49,369 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16256 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=16705, Invalid=20737, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 18:18:49,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-12-03 18:18:49,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2018-12-03 18:18:49,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-12-03 18:18:49,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 132 transitions. [2018-12-03 18:18:49,373 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 132 transitions. Word has length 129 [2018-12-03 18:18:49,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:49,374 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 132 transitions. [2018-12-03 18:18:49,374 INFO L481 AbstractCegarLoop]: Interpolant automaton has 130 states. [2018-12-03 18:18:49,374 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 132 transitions. [2018-12-03 18:18:49,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-12-03 18:18:49,375 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:49,375 INFO L402 BasicCegarLoop]: trace histogram [65, 64, 1, 1] [2018-12-03 18:18:49,375 INFO L423 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:49,375 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:49,375 INFO L82 PathProgramCache]: Analyzing trace with hash 1852347744, now seen corresponding path program 64 times [2018-12-03 18:18:49,375 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:49,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:49,376 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:18:49,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:49,377 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:49,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:51,250 INFO L134 CoverageAnalysis]: Checked inductivity of 4160 backedges. 0 proven. 4160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:51,250 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:51,250 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:51,250 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:51,251 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:51,251 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:51,251 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 18:18:51,261 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:18:51,261 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:18:51,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:51,295 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:53,686 INFO L134 CoverageAnalysis]: Checked inductivity of 4160 backedges. 0 proven. 4160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:53,686 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:59,005 INFO L134 CoverageAnalysis]: Checked inductivity of 4160 backedges. 0 proven. 4160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:59,049 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:59,049 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 195 [2018-12-03 18:18:59,049 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:59,050 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2018-12-03 18:18:59,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2018-12-03 18:18:59,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17226, Invalid=21386, Unknown=0, NotChecked=0, Total=38612 [2018-12-03 18:18:59,051 INFO L87 Difference]: Start difference. First operand 132 states and 132 transitions. Second operand 132 states. [2018-12-03 18:18:59,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:59,348 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-12-03 18:18:59,348 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 18:18:59,348 INFO L78 Accepts]: Start accepts. Automaton has 132 states. Word has length 131 [2018-12-03 18:18:59,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:59,349 INFO L225 Difference]: With dead ends: 135 [2018-12-03 18:18:59,349 INFO L226 Difference]: Without dead ends: 134 [2018-12-03 18:18:59,350 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16770 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=17226, Invalid=21386, Unknown=0, NotChecked=0, Total=38612 [2018-12-03 18:18:59,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2018-12-03 18:18:59,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2018-12-03 18:18:59,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2018-12-03 18:18:59,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 134 transitions. [2018-12-03 18:18:59,356 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 134 transitions. Word has length 131 [2018-12-03 18:18:59,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:59,356 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 134 transitions. [2018-12-03 18:18:59,356 INFO L481 AbstractCegarLoop]: Interpolant automaton has 132 states. [2018-12-03 18:18:59,356 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 134 transitions. [2018-12-03 18:18:59,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2018-12-03 18:18:59,357 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:59,357 INFO L402 BasicCegarLoop]: trace histogram [66, 65, 1, 1] [2018-12-03 18:18:59,357 INFO L423 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:59,357 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:59,358 INFO L82 PathProgramCache]: Analyzing trace with hash 1989722530, now seen corresponding path program 65 times [2018-12-03 18:18:59,358 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:59,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:59,358 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:18:59,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:59,359 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:59,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:01,371 INFO L134 CoverageAnalysis]: Checked inductivity of 4290 backedges. 0 proven. 4290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:01,372 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:01,372 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:01,372 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:01,372 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:01,372 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:01,372 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 18:19:01,381 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:19:01,381 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:19:01,456 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2018-12-03 18:19:01,456 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:19:01,461 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:05,462 INFO L134 CoverageAnalysis]: Checked inductivity of 4290 backedges. 0 proven. 4290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:05,462 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:10,916 INFO L134 CoverageAnalysis]: Checked inductivity of 4290 backedges. 0 proven. 4290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:10,935 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:10,935 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 198 [2018-12-03 18:19:10,935 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:10,935 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2018-12-03 18:19:10,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2018-12-03 18:19:10,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17755, Invalid=22045, Unknown=0, NotChecked=0, Total=39800 [2018-12-03 18:19:10,938 INFO L87 Difference]: Start difference. First operand 134 states and 134 transitions. Second operand 134 states. [2018-12-03 18:19:11,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:11,256 INFO L93 Difference]: Finished difference Result 137 states and 137 transitions. [2018-12-03 18:19:11,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-12-03 18:19:11,257 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 133 [2018-12-03 18:19:11,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:11,257 INFO L225 Difference]: With dead ends: 137 [2018-12-03 18:19:11,257 INFO L226 Difference]: Without dead ends: 136 [2018-12-03 18:19:11,259 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17292 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=17755, Invalid=22045, Unknown=0, NotChecked=0, Total=39800 [2018-12-03 18:19:11,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-12-03 18:19:11,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2018-12-03 18:19:11,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-12-03 18:19:11,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 136 transitions. [2018-12-03 18:19:11,264 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 136 transitions. Word has length 133 [2018-12-03 18:19:11,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:11,264 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 136 transitions. [2018-12-03 18:19:11,264 INFO L481 AbstractCegarLoop]: Interpolant automaton has 134 states. [2018-12-03 18:19:11,265 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 136 transitions. [2018-12-03 18:19:11,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-12-03 18:19:11,265 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:11,265 INFO L402 BasicCegarLoop]: trace histogram [67, 66, 1, 1] [2018-12-03 18:19:11,266 INFO L423 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:11,266 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:11,266 INFO L82 PathProgramCache]: Analyzing trace with hash 862905700, now seen corresponding path program 66 times [2018-12-03 18:19:11,266 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:11,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:11,267 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:19:11,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:11,267 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:11,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:13,170 INFO L134 CoverageAnalysis]: Checked inductivity of 4422 backedges. 0 proven. 4422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:13,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:13,171 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:13,171 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:13,171 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:13,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:13,171 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 18:19:13,181 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:19:13,182 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:19:13,217 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:19:13,217 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:19:13,221 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:15,888 INFO L134 CoverageAnalysis]: Checked inductivity of 4422 backedges. 0 proven. 4422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:15,888 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:21,536 INFO L134 CoverageAnalysis]: Checked inductivity of 4422 backedges. 0 proven. 4422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:21,555 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:21,555 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 201 [2018-12-03 18:19:21,555 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:21,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 136 states [2018-12-03 18:19:21,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2018-12-03 18:19:21,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18292, Invalid=22714, Unknown=0, NotChecked=0, Total=41006 [2018-12-03 18:19:21,559 INFO L87 Difference]: Start difference. First operand 136 states and 136 transitions. Second operand 136 states. [2018-12-03 18:19:21,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:21,942 INFO L93 Difference]: Finished difference Result 139 states and 139 transitions. [2018-12-03 18:19:21,942 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-12-03 18:19:21,942 INFO L78 Accepts]: Start accepts. Automaton has 136 states. Word has length 135 [2018-12-03 18:19:21,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:21,944 INFO L225 Difference]: With dead ends: 139 [2018-12-03 18:19:21,944 INFO L226 Difference]: Without dead ends: 138 [2018-12-03 18:19:21,946 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 201 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17822 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=18292, Invalid=22714, Unknown=0, NotChecked=0, Total=41006 [2018-12-03 18:19:21,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-12-03 18:19:21,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2018-12-03 18:19:21,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-12-03 18:19:21,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 138 transitions. [2018-12-03 18:19:21,950 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 138 transitions. Word has length 135 [2018-12-03 18:19:21,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:21,950 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 138 transitions. [2018-12-03 18:19:21,950 INFO L481 AbstractCegarLoop]: Interpolant automaton has 136 states. [2018-12-03 18:19:21,950 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 138 transitions. [2018-12-03 18:19:21,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-12-03 18:19:21,951 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:21,951 INFO L402 BasicCegarLoop]: trace histogram [68, 67, 1, 1] [2018-12-03 18:19:21,951 INFO L423 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:21,951 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:21,952 INFO L82 PathProgramCache]: Analyzing trace with hash 323690662, now seen corresponding path program 67 times [2018-12-03 18:19:21,952 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:21,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:21,952 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:19:21,953 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:21,953 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:21,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:23,950 INFO L134 CoverageAnalysis]: Checked inductivity of 4556 backedges. 0 proven. 4556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:23,950 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:23,950 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:23,951 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:23,951 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:23,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:23,951 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 18:19:23,959 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:19:23,959 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:19:23,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:23,996 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:26,732 INFO L134 CoverageAnalysis]: Checked inductivity of 4556 backedges. 0 proven. 4556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:26,732 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:32,257 INFO L134 CoverageAnalysis]: Checked inductivity of 4556 backedges. 0 proven. 4556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:32,275 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:32,275 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 204 [2018-12-03 18:19:32,275 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:32,276 INFO L459 AbstractCegarLoop]: Interpolant automaton has 138 states [2018-12-03 18:19:32,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 138 interpolants. [2018-12-03 18:19:32,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18837, Invalid=23393, Unknown=0, NotChecked=0, Total=42230 [2018-12-03 18:19:32,278 INFO L87 Difference]: Start difference. First operand 138 states and 138 transitions. Second operand 138 states. [2018-12-03 18:19:32,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:32,617 INFO L93 Difference]: Finished difference Result 141 states and 141 transitions. [2018-12-03 18:19:32,618 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-12-03 18:19:32,618 INFO L78 Accepts]: Start accepts. Automaton has 138 states. Word has length 137 [2018-12-03 18:19:32,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:32,618 INFO L225 Difference]: With dead ends: 141 [2018-12-03 18:19:32,618 INFO L226 Difference]: Without dead ends: 140 [2018-12-03 18:19:32,620 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18360 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=18837, Invalid=23393, Unknown=0, NotChecked=0, Total=42230 [2018-12-03 18:19:32,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2018-12-03 18:19:32,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2018-12-03 18:19:32,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2018-12-03 18:19:32,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 140 transitions. [2018-12-03 18:19:32,625 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 140 transitions. Word has length 137 [2018-12-03 18:19:32,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:32,625 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 140 transitions. [2018-12-03 18:19:32,625 INFO L481 AbstractCegarLoop]: Interpolant automaton has 138 states. [2018-12-03 18:19:32,625 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 140 transitions. [2018-12-03 18:19:32,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2018-12-03 18:19:32,626 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:32,626 INFO L402 BasicCegarLoop]: trace histogram [69, 68, 1, 1] [2018-12-03 18:19:32,626 INFO L423 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:32,626 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:32,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1829081960, now seen corresponding path program 68 times [2018-12-03 18:19:32,626 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:32,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:32,627 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:19:32,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:32,627 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:32,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:34,900 INFO L134 CoverageAnalysis]: Checked inductivity of 4692 backedges. 0 proven. 4692 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:34,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:34,900 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:34,900 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:34,900 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:34,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:34,901 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 18:19:34,908 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:19:34,908 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:19:34,994 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2018-12-03 18:19:34,994 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:19:34,997 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:37,484 INFO L134 CoverageAnalysis]: Checked inductivity of 4692 backedges. 0 proven. 4692 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:37,485 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:43,294 INFO L134 CoverageAnalysis]: Checked inductivity of 4692 backedges. 0 proven. 4692 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:43,313 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:43,313 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 207 [2018-12-03 18:19:43,313 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:43,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2018-12-03 18:19:43,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2018-12-03 18:19:43,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19390, Invalid=24082, Unknown=0, NotChecked=0, Total=43472 [2018-12-03 18:19:43,316 INFO L87 Difference]: Start difference. First operand 140 states and 140 transitions. Second operand 140 states. [2018-12-03 18:19:43,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:43,632 INFO L93 Difference]: Finished difference Result 143 states and 143 transitions. [2018-12-03 18:19:43,632 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 18:19:43,632 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 139 [2018-12-03 18:19:43,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:43,634 INFO L225 Difference]: With dead ends: 143 [2018-12-03 18:19:43,634 INFO L226 Difference]: Without dead ends: 142 [2018-12-03 18:19:43,635 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18906 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=19390, Invalid=24082, Unknown=0, NotChecked=0, Total=43472 [2018-12-03 18:19:43,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-12-03 18:19:43,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-12-03 18:19:43,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-12-03 18:19:43,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 142 transitions. [2018-12-03 18:19:43,639 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 142 transitions. Word has length 139 [2018-12-03 18:19:43,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:43,639 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 142 transitions. [2018-12-03 18:19:43,639 INFO L481 AbstractCegarLoop]: Interpolant automaton has 140 states. [2018-12-03 18:19:43,640 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 142 transitions. [2018-12-03 18:19:43,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-12-03 18:19:43,640 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:43,640 INFO L402 BasicCegarLoop]: trace histogram [70, 69, 1, 1] [2018-12-03 18:19:43,641 INFO L423 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:43,641 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:43,641 INFO L82 PathProgramCache]: Analyzing trace with hash 1106140586, now seen corresponding path program 69 times [2018-12-03 18:19:43,641 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:43,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:43,642 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:19:43,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:43,642 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:43,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:45,939 INFO L134 CoverageAnalysis]: Checked inductivity of 4830 backedges. 0 proven. 4830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:45,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:45,939 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:45,939 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:45,939 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:45,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:45,940 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 18:19:45,948 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:19:45,949 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:19:45,988 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:19:45,988 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:19:45,991 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:48,625 INFO L134 CoverageAnalysis]: Checked inductivity of 4830 backedges. 0 proven. 4830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:48,625 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:54,480 INFO L134 CoverageAnalysis]: Checked inductivity of 4830 backedges. 0 proven. 4830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:54,500 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:54,500 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 210 [2018-12-03 18:19:54,500 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:54,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 142 states [2018-12-03 18:19:54,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2018-12-03 18:19:54,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19951, Invalid=24781, Unknown=0, NotChecked=0, Total=44732 [2018-12-03 18:19:54,503 INFO L87 Difference]: Start difference. First operand 142 states and 142 transitions. Second operand 142 states. [2018-12-03 18:19:54,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:54,935 INFO L93 Difference]: Finished difference Result 145 states and 145 transitions. [2018-12-03 18:19:54,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-03 18:19:54,935 INFO L78 Accepts]: Start accepts. Automaton has 142 states. Word has length 141 [2018-12-03 18:19:54,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:54,936 INFO L225 Difference]: With dead ends: 145 [2018-12-03 18:19:54,936 INFO L226 Difference]: Without dead ends: 144 [2018-12-03 18:19:54,938 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19460 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=19951, Invalid=24781, Unknown=0, NotChecked=0, Total=44732 [2018-12-03 18:19:54,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2018-12-03 18:19:54,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2018-12-03 18:19:54,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-12-03 18:19:54,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 144 transitions. [2018-12-03 18:19:54,942 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 144 transitions. Word has length 141 [2018-12-03 18:19:54,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:54,942 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 144 transitions. [2018-12-03 18:19:54,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has 142 states. [2018-12-03 18:19:54,942 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 144 transitions. [2018-12-03 18:19:54,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-12-03 18:19:54,943 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:54,943 INFO L402 BasicCegarLoop]: trace histogram [71, 70, 1, 1] [2018-12-03 18:19:54,943 INFO L423 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:54,943 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:54,944 INFO L82 PathProgramCache]: Analyzing trace with hash 2144182124, now seen corresponding path program 70 times [2018-12-03 18:19:54,944 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:54,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:54,944 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:19:54,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:54,945 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:54,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:57,136 INFO L134 CoverageAnalysis]: Checked inductivity of 4970 backedges. 0 proven. 4970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:57,136 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:57,137 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:57,137 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:57,137 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:57,137 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:57,137 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 18:19:57,145 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:19:57,145 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:19:57,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:57,183 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:59,815 INFO L134 CoverageAnalysis]: Checked inductivity of 4970 backedges. 0 proven. 4970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:59,815 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:20:06,353 INFO L134 CoverageAnalysis]: Checked inductivity of 4970 backedges. 0 proven. 4970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:06,372 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:20:06,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 213 [2018-12-03 18:20:06,372 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:20:06,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 144 states [2018-12-03 18:20:06,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2018-12-03 18:20:06,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20520, Invalid=25490, Unknown=0, NotChecked=0, Total=46010 [2018-12-03 18:20:06,375 INFO L87 Difference]: Start difference. First operand 144 states and 144 transitions. Second operand 144 states. [2018-12-03 18:20:06,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:20:06,749 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2018-12-03 18:20:06,749 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-12-03 18:20:06,749 INFO L78 Accepts]: Start accepts. Automaton has 144 states. Word has length 143 [2018-12-03 18:20:06,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:20:06,751 INFO L225 Difference]: With dead ends: 147 [2018-12-03 18:20:06,751 INFO L226 Difference]: Without dead ends: 146 [2018-12-03 18:20:06,753 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 213 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20022 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=20520, Invalid=25490, Unknown=0, NotChecked=0, Total=46010 [2018-12-03 18:20:06,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2018-12-03 18:20:06,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 146. [2018-12-03 18:20:06,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-12-03 18:20:06,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 146 transitions. [2018-12-03 18:20:06,757 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 146 transitions. Word has length 143 [2018-12-03 18:20:06,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:20:06,757 INFO L480 AbstractCegarLoop]: Abstraction has 146 states and 146 transitions. [2018-12-03 18:20:06,757 INFO L481 AbstractCegarLoop]: Interpolant automaton has 144 states. [2018-12-03 18:20:06,757 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 146 transitions. [2018-12-03 18:20:06,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2018-12-03 18:20:06,758 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:20:06,758 INFO L402 BasicCegarLoop]: trace histogram [72, 71, 1, 1] [2018-12-03 18:20:06,758 INFO L423 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:20:06,758 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:20:06,758 INFO L82 PathProgramCache]: Analyzing trace with hash -1025279826, now seen corresponding path program 71 times [2018-12-03 18:20:06,758 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:20:06,759 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:06,759 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:20:06,759 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:06,759 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:20:06,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:20:08,942 INFO L134 CoverageAnalysis]: Checked inductivity of 5112 backedges. 0 proven. 5112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:08,942 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:08,943 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:20:08,943 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:20:08,943 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:20:08,943 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:08,943 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 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 18:20:08,952 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:20:08,953 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:20:09,152 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 72 check-sat command(s) [2018-12-03 18:20:09,152 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:20:09,156 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:20:12,460 INFO L134 CoverageAnalysis]: Checked inductivity of 5112 backedges. 0 proven. 5112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:12,460 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:20:18,807 INFO L134 CoverageAnalysis]: Checked inductivity of 5112 backedges. 0 proven. 5112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:18,825 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:20:18,826 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 216 [2018-12-03 18:20:18,826 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:20:18,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2018-12-03 18:20:18,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2018-12-03 18:20:18,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21097, Invalid=26209, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 18:20:18,829 INFO L87 Difference]: Start difference. First operand 146 states and 146 transitions. Second operand 146 states. [2018-12-03 18:20:19,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:20:19,244 INFO L93 Difference]: Finished difference Result 149 states and 149 transitions. [2018-12-03 18:20:19,244 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2018-12-03 18:20:19,244 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 145 [2018-12-03 18:20:19,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:20:19,245 INFO L225 Difference]: With dead ends: 149 [2018-12-03 18:20:19,245 INFO L226 Difference]: Without dead ends: 148 [2018-12-03 18:20:19,250 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20592 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=21097, Invalid=26209, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 18:20:19,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-12-03 18:20:19,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2018-12-03 18:20:19,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-12-03 18:20:19,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 148 transitions. [2018-12-03 18:20:19,255 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 148 transitions. Word has length 145 [2018-12-03 18:20:19,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:20:19,255 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 148 transitions. [2018-12-03 18:20:19,255 INFO L481 AbstractCegarLoop]: Interpolant automaton has 146 states. [2018-12-03 18:20:19,255 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 148 transitions. [2018-12-03 18:20:19,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-12-03 18:20:19,256 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:20:19,256 INFO L402 BasicCegarLoop]: trace histogram [73, 72, 1, 1] [2018-12-03 18:20:19,256 INFO L423 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:20:19,256 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:20:19,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1746400912, now seen corresponding path program 72 times [2018-12-03 18:20:19,257 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:20:19,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:19,257 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:20:19,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:19,258 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:20:19,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:20:22,233 INFO L134 CoverageAnalysis]: Checked inductivity of 5256 backedges. 0 proven. 5256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:22,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:22,233 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:20:22,233 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:20:22,233 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:20:22,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:22,233 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 18:20:22,242 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:20:22,242 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:20:22,278 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:20:22,278 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:20:22,281 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:20:25,170 INFO L134 CoverageAnalysis]: Checked inductivity of 5256 backedges. 0 proven. 5256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:25,170 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:20:32,000 INFO L134 CoverageAnalysis]: Checked inductivity of 5256 backedges. 0 proven. 5256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:32,018 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:20:32,018 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 219 [2018-12-03 18:20:32,018 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:20:32,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 148 states [2018-12-03 18:20:32,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2018-12-03 18:20:32,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21682, Invalid=26938, Unknown=0, NotChecked=0, Total=48620 [2018-12-03 18:20:32,021 INFO L87 Difference]: Start difference. First operand 148 states and 148 transitions. Second operand 148 states. [2018-12-03 18:20:32,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:20:32,419 INFO L93 Difference]: Finished difference Result 151 states and 151 transitions. [2018-12-03 18:20:32,419 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 18:20:32,419 INFO L78 Accepts]: Start accepts. Automaton has 148 states. Word has length 147 [2018-12-03 18:20:32,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:20:32,421 INFO L225 Difference]: With dead ends: 151 [2018-12-03 18:20:32,421 INFO L226 Difference]: Without dead ends: 150 [2018-12-03 18:20:32,422 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21170 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=21682, Invalid=26938, Unknown=0, NotChecked=0, Total=48620 [2018-12-03 18:20:32,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-12-03 18:20:32,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 150. [2018-12-03 18:20:32,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-12-03 18:20:32,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 150 transitions. [2018-12-03 18:20:32,427 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 150 transitions. Word has length 147 [2018-12-03 18:20:32,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:20:32,428 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 150 transitions. [2018-12-03 18:20:32,428 INFO L481 AbstractCegarLoop]: Interpolant automaton has 148 states. [2018-12-03 18:20:32,428 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 150 transitions. [2018-12-03 18:20:32,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-12-03 18:20:32,429 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:20:32,429 INFO L402 BasicCegarLoop]: trace histogram [74, 73, 1, 1] [2018-12-03 18:20:32,429 INFO L423 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:20:32,429 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:20:32,429 INFO L82 PathProgramCache]: Analyzing trace with hash 1040937394, now seen corresponding path program 73 times [2018-12-03 18:20:32,430 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:20:32,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:32,430 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:20:32,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:32,430 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:20:32,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:20:34,771 INFO L134 CoverageAnalysis]: Checked inductivity of 5402 backedges. 0 proven. 5402 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:34,771 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:34,771 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:20:34,771 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:20:34,772 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:20:34,772 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:34,772 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 18:20:34,781 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:20:34,782 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:20:34,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:20:34,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:20:37,970 INFO L134 CoverageAnalysis]: Checked inductivity of 5402 backedges. 0 proven. 5402 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:37,970 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:20:44,694 INFO L134 CoverageAnalysis]: Checked inductivity of 5402 backedges. 0 proven. 5402 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:44,713 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:20:44,713 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 222 [2018-12-03 18:20:44,713 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:20:44,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 150 states [2018-12-03 18:20:44,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 150 interpolants. [2018-12-03 18:20:44,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22275, Invalid=27677, Unknown=0, NotChecked=0, Total=49952 [2018-12-03 18:20:44,717 INFO L87 Difference]: Start difference. First operand 150 states and 150 transitions. Second operand 150 states. [2018-12-03 18:20:45,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:20:45,107 INFO L93 Difference]: Finished difference Result 153 states and 153 transitions. [2018-12-03 18:20:45,108 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-12-03 18:20:45,108 INFO L78 Accepts]: Start accepts. Automaton has 150 states. Word has length 149 [2018-12-03 18:20:45,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:20:45,109 INFO L225 Difference]: With dead ends: 153 [2018-12-03 18:20:45,109 INFO L226 Difference]: Without dead ends: 152 [2018-12-03 18:20:45,111 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21756 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=22275, Invalid=27677, Unknown=0, NotChecked=0, Total=49952 [2018-12-03 18:20:45,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-12-03 18:20:45,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2018-12-03 18:20:45,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2018-12-03 18:20:45,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 152 transitions. [2018-12-03 18:20:45,117 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 152 transitions. Word has length 149 [2018-12-03 18:20:45,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:20:45,117 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 152 transitions. [2018-12-03 18:20:45,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has 150 states. [2018-12-03 18:20:45,117 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 152 transitions. [2018-12-03 18:20:45,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2018-12-03 18:20:45,118 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:20:45,118 INFO L402 BasicCegarLoop]: trace histogram [75, 74, 1, 1] [2018-12-03 18:20:45,118 INFO L423 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:20:45,118 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:20:45,119 INFO L82 PathProgramCache]: Analyzing trace with hash -386543244, now seen corresponding path program 74 times [2018-12-03 18:20:45,119 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:20:45,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:45,119 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:20:45,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:45,120 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:20:45,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:20:47,824 INFO L134 CoverageAnalysis]: Checked inductivity of 5550 backedges. 0 proven. 5550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:47,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:47,824 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:20:47,824 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:20:47,825 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:20:47,825 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:47,825 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 18:20:47,833 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:20:47,833 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:20:47,915 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 75 check-sat command(s) [2018-12-03 18:20:47,915 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:20:47,918 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:20:50,828 INFO L134 CoverageAnalysis]: Checked inductivity of 5550 backedges. 0 proven. 5550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:50,829 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:20:58,067 INFO L134 CoverageAnalysis]: Checked inductivity of 5550 backedges. 0 proven. 5550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:58,085 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:20:58,085 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 225 [2018-12-03 18:20:58,086 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:20:58,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2018-12-03 18:20:58,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2018-12-03 18:20:58,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22876, Invalid=28426, Unknown=0, NotChecked=0, Total=51302 [2018-12-03 18:20:58,089 INFO L87 Difference]: Start difference. First operand 152 states and 152 transitions. Second operand 152 states. [2018-12-03 18:20:58,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:20:58,511 INFO L93 Difference]: Finished difference Result 155 states and 155 transitions. [2018-12-03 18:20:58,511 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 18:20:58,512 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 151 [2018-12-03 18:20:58,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:20:58,512 INFO L225 Difference]: With dead ends: 155 [2018-12-03 18:20:58,513 INFO L226 Difference]: Without dead ends: 154 [2018-12-03 18:20:58,514 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 225 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22350 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=22876, Invalid=28426, Unknown=0, NotChecked=0, Total=51302 [2018-12-03 18:20:58,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-12-03 18:20:58,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 154. [2018-12-03 18:20:58,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-12-03 18:20:58,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 154 transitions. [2018-12-03 18:20:58,518 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 154 transitions. Word has length 151 [2018-12-03 18:20:58,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:20:58,518 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 154 transitions. [2018-12-03 18:20:58,518 INFO L481 AbstractCegarLoop]: Interpolant automaton has 152 states. [2018-12-03 18:20:58,518 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 154 transitions. [2018-12-03 18:20:58,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-12-03 18:20:58,518 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:20:58,519 INFO L402 BasicCegarLoop]: trace histogram [76, 75, 1, 1] [2018-12-03 18:20:58,519 INFO L423 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:20:58,519 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:20:58,519 INFO L82 PathProgramCache]: Analyzing trace with hash -2100868938, now seen corresponding path program 75 times [2018-12-03 18:20:58,519 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:20:58,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:58,520 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:20:58,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:58,520 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:20:58,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:21:00,934 INFO L134 CoverageAnalysis]: Checked inductivity of 5700 backedges. 0 proven. 5700 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:00,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:00,935 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:21:00,935 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:21:00,935 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:21:00,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:00,935 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 18:21:00,944 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:21:00,944 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:21:00,988 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:21:00,989 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:21:00,992 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:21:04,251 INFO L134 CoverageAnalysis]: Checked inductivity of 5700 backedges. 0 proven. 5700 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:04,251 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:21:11,314 INFO L134 CoverageAnalysis]: Checked inductivity of 5700 backedges. 0 proven. 5700 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:11,333 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:21:11,333 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 228 [2018-12-03 18:21:11,333 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:21:11,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 154 states [2018-12-03 18:21:11,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2018-12-03 18:21:11,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23485, Invalid=29185, Unknown=0, NotChecked=0, Total=52670 [2018-12-03 18:21:11,337 INFO L87 Difference]: Start difference. First operand 154 states and 154 transitions. Second operand 154 states. [2018-12-03 18:21:11,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:21:11,879 INFO L93 Difference]: Finished difference Result 157 states and 157 transitions. [2018-12-03 18:21:11,880 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2018-12-03 18:21:11,880 INFO L78 Accepts]: Start accepts. Automaton has 154 states. Word has length 153 [2018-12-03 18:21:11,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:21:11,880 INFO L225 Difference]: With dead ends: 157 [2018-12-03 18:21:11,881 INFO L226 Difference]: Without dead ends: 156 [2018-12-03 18:21:11,882 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22952 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=23485, Invalid=29185, Unknown=0, NotChecked=0, Total=52670 [2018-12-03 18:21:11,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2018-12-03 18:21:11,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 156. [2018-12-03 18:21:11,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-12-03 18:21:11,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 156 transitions. [2018-12-03 18:21:11,886 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 156 transitions. Word has length 153 [2018-12-03 18:21:11,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:21:11,886 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 156 transitions. [2018-12-03 18:21:11,886 INFO L481 AbstractCegarLoop]: Interpolant automaton has 154 states. [2018-12-03 18:21:11,886 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 156 transitions. [2018-12-03 18:21:11,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-12-03 18:21:11,887 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:21:11,887 INFO L402 BasicCegarLoop]: trace histogram [77, 76, 1, 1] [2018-12-03 18:21:11,887 INFO L423 AbstractCegarLoop]: === Iteration 77 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:21:11,887 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:21:11,887 INFO L82 PathProgramCache]: Analyzing trace with hash -300419208, now seen corresponding path program 76 times [2018-12-03 18:21:11,887 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:21:11,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:11,888 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:21:11,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:11,888 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:21:11,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:21:14,375 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 0 proven. 5852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:14,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:14,375 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:21:14,376 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:21:14,376 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:21:14,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:14,376 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 18:21:14,384 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:21:14,384 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:21:14,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:21:14,425 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:21:17,733 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 0 proven. 5852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:17,733 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:21:25,001 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 0 proven. 5852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:25,019 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:21:25,020 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 231 [2018-12-03 18:21:25,020 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:21:25,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 156 states [2018-12-03 18:21:25,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 156 interpolants. [2018-12-03 18:21:25,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24102, Invalid=29954, Unknown=0, NotChecked=0, Total=54056 [2018-12-03 18:21:25,023 INFO L87 Difference]: Start difference. First operand 156 states and 156 transitions. Second operand 156 states. [2018-12-03 18:21:25,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:21:25,394 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2018-12-03 18:21:25,394 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-12-03 18:21:25,394 INFO L78 Accepts]: Start accepts. Automaton has 156 states. Word has length 155 [2018-12-03 18:21:25,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:21:25,395 INFO L225 Difference]: With dead ends: 159 [2018-12-03 18:21:25,395 INFO L226 Difference]: Without dead ends: 158 [2018-12-03 18:21:25,396 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 385 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 231 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23562 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=24102, Invalid=29954, Unknown=0, NotChecked=0, Total=54056 [2018-12-03 18:21:25,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2018-12-03 18:21:25,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 158. [2018-12-03 18:21:25,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2018-12-03 18:21:25,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 158 transitions. [2018-12-03 18:21:25,401 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 158 transitions. Word has length 155 [2018-12-03 18:21:25,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:21:25,401 INFO L480 AbstractCegarLoop]: Abstraction has 158 states and 158 transitions. [2018-12-03 18:21:25,401 INFO L481 AbstractCegarLoop]: Interpolant automaton has 156 states. [2018-12-03 18:21:25,401 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 158 transitions. [2018-12-03 18:21:25,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2018-12-03 18:21:25,401 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:21:25,402 INFO L402 BasicCegarLoop]: trace histogram [78, 77, 1, 1] [2018-12-03 18:21:25,402 INFO L423 AbstractCegarLoop]: === Iteration 78 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:21:25,402 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:21:25,402 INFO L82 PathProgramCache]: Analyzing trace with hash -940048966, now seen corresponding path program 77 times [2018-12-03 18:21:25,402 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:21:25,403 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:25,403 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:21:25,403 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:25,403 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:21:25,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:21:28,183 INFO L134 CoverageAnalysis]: Checked inductivity of 6006 backedges. 0 proven. 6006 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:28,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:28,184 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:21:28,184 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:21:28,184 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:21:28,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:28,184 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 18:21:28,192 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:21:28,192 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:21:28,276 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 18:21:28,277 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:21:28,279 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:21:31,389 INFO L134 CoverageAnalysis]: Checked inductivity of 6006 backedges. 0 proven. 6006 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:31,390 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:21:38,856 INFO L134 CoverageAnalysis]: Checked inductivity of 6006 backedges. 0 proven. 6006 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:38,874 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:21:38,875 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78, 78] total 234 [2018-12-03 18:21:38,875 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:21:38,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2018-12-03 18:21:38,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2018-12-03 18:21:38,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24727, Invalid=30733, Unknown=0, NotChecked=0, Total=55460 [2018-12-03 18:21:38,878 INFO L87 Difference]: Start difference. First operand 158 states and 158 transitions. Second operand 158 states. [2018-12-03 18:21:39,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:21:39,291 INFO L93 Difference]: Finished difference Result 161 states and 161 transitions. [2018-12-03 18:21:39,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-12-03 18:21:39,291 INFO L78 Accepts]: Start accepts. Automaton has 158 states. Word has length 157 [2018-12-03 18:21:39,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:21:39,293 INFO L225 Difference]: With dead ends: 161 [2018-12-03 18:21:39,293 INFO L226 Difference]: Without dead ends: 160 [2018-12-03 18:21:39,295 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24180 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=24727, Invalid=30733, Unknown=0, NotChecked=0, Total=55460 [2018-12-03 18:21:39,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-12-03 18:21:39,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2018-12-03 18:21:39,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-12-03 18:21:39,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 160 transitions. [2018-12-03 18:21:39,301 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 160 transitions. Word has length 157 [2018-12-03 18:21:39,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:21:39,301 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 160 transitions. [2018-12-03 18:21:39,301 INFO L481 AbstractCegarLoop]: Interpolant automaton has 158 states. [2018-12-03 18:21:39,301 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 160 transitions. [2018-12-03 18:21:39,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-12-03 18:21:39,302 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:21:39,302 INFO L402 BasicCegarLoop]: trace histogram [79, 78, 1, 1] [2018-12-03 18:21:39,302 INFO L423 AbstractCegarLoop]: === Iteration 79 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:21:39,302 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:21:39,303 INFO L82 PathProgramCache]: Analyzing trace with hash -1443923076, now seen corresponding path program 78 times [2018-12-03 18:21:39,303 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:21:39,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:39,303 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:21:39,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:39,304 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:21:39,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:21:41,907 INFO L134 CoverageAnalysis]: Checked inductivity of 6162 backedges. 0 proven. 6162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:41,908 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:41,908 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:21:41,908 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:21:41,908 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:21:41,908 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:41,908 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 18:21:41,917 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:21:41,917 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:21:41,965 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:21:41,965 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:21:41,969 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:21:45,384 INFO L134 CoverageAnalysis]: Checked inductivity of 6162 backedges. 0 proven. 6162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:45,384 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:21:53,010 INFO L134 CoverageAnalysis]: Checked inductivity of 6162 backedges. 0 proven. 6162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:53,029 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:21:53,029 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 237 [2018-12-03 18:21:53,029 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:21:53,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 160 states [2018-12-03 18:21:53,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2018-12-03 18:21:53,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25360, Invalid=31522, Unknown=0, NotChecked=0, Total=56882 [2018-12-03 18:21:53,033 INFO L87 Difference]: Start difference. First operand 160 states and 160 transitions. Second operand 160 states. [2018-12-03 18:21:53,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:21:53,477 INFO L93 Difference]: Finished difference Result 163 states and 163 transitions. [2018-12-03 18:21:53,477 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 18:21:53,477 INFO L78 Accepts]: Start accepts. Automaton has 160 states. Word has length 159 [2018-12-03 18:21:53,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:21:53,478 INFO L225 Difference]: With dead ends: 163 [2018-12-03 18:21:53,478 INFO L226 Difference]: Without dead ends: 162 [2018-12-03 18:21:53,480 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 237 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24806 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=25360, Invalid=31522, Unknown=0, NotChecked=0, Total=56882 [2018-12-03 18:21:53,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2018-12-03 18:21:53,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 162. [2018-12-03 18:21:53,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-12-03 18:21:53,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 162 transitions. [2018-12-03 18:21:53,486 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 162 transitions. Word has length 159 [2018-12-03 18:21:53,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:21:53,486 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 162 transitions. [2018-12-03 18:21:53,486 INFO L481 AbstractCegarLoop]: Interpolant automaton has 160 states. [2018-12-03 18:21:53,486 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 162 transitions. [2018-12-03 18:21:53,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-12-03 18:21:53,487 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:21:53,487 INFO L402 BasicCegarLoop]: trace histogram [80, 79, 1, 1] [2018-12-03 18:21:53,488 INFO L423 AbstractCegarLoop]: === Iteration 80 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:21:53,488 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:21:53,488 INFO L82 PathProgramCache]: Analyzing trace with hash -335638338, now seen corresponding path program 79 times [2018-12-03 18:21:53,488 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:21:53,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:53,489 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:21:53,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:53,489 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:21:53,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:21:56,177 INFO L134 CoverageAnalysis]: Checked inductivity of 6320 backedges. 0 proven. 6320 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:56,177 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:56,177 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:21:56,177 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:21:56,177 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:21:56,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:56,178 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 18:21:56,187 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:21:56,187 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:21:56,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:21:56,229 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:21:59,688 INFO L134 CoverageAnalysis]: Checked inductivity of 6320 backedges. 0 proven. 6320 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:59,689 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:22:07,208 INFO L134 CoverageAnalysis]: Checked inductivity of 6320 backedges. 0 proven. 6320 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:07,226 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:22:07,226 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 240 [2018-12-03 18:22:07,226 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:22:07,227 INFO L459 AbstractCegarLoop]: Interpolant automaton has 162 states [2018-12-03 18:22:07,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 162 interpolants. [2018-12-03 18:22:07,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26001, Invalid=32321, Unknown=0, NotChecked=0, Total=58322 [2018-12-03 18:22:07,229 INFO L87 Difference]: Start difference. First operand 162 states and 162 transitions. Second operand 162 states. [2018-12-03 18:22:07,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:22:07,644 INFO L93 Difference]: Finished difference Result 165 states and 165 transitions. [2018-12-03 18:22:07,644 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2018-12-03 18:22:07,644 INFO L78 Accepts]: Start accepts. Automaton has 162 states. Word has length 161 [2018-12-03 18:22:07,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:22:07,645 INFO L225 Difference]: With dead ends: 165 [2018-12-03 18:22:07,645 INFO L226 Difference]: Without dead ends: 164 [2018-12-03 18:22:07,647 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 240 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25440 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=26001, Invalid=32321, Unknown=0, NotChecked=0, Total=58322 [2018-12-03 18:22:07,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2018-12-03 18:22:07,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 164. [2018-12-03 18:22:07,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-12-03 18:22:07,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 164 transitions. [2018-12-03 18:22:07,653 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 164 transitions. Word has length 161 [2018-12-03 18:22:07,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:22:07,653 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 164 transitions. [2018-12-03 18:22:07,653 INFO L481 AbstractCegarLoop]: Interpolant automaton has 162 states. [2018-12-03 18:22:07,653 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 164 transitions. [2018-12-03 18:22:07,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-12-03 18:22:07,654 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:22:07,654 INFO L402 BasicCegarLoop]: trace histogram [81, 80, 1, 1] [2018-12-03 18:22:07,654 INFO L423 AbstractCegarLoop]: === Iteration 81 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:22:07,655 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:22:07,655 INFO L82 PathProgramCache]: Analyzing trace with hash -425894528, now seen corresponding path program 80 times [2018-12-03 18:22:07,655 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:22:07,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:07,656 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:22:07,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:07,656 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:22:07,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:22:10,642 INFO L134 CoverageAnalysis]: Checked inductivity of 6480 backedges. 0 proven. 6480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:10,643 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:10,643 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:22:10,643 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:22:10,643 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:22:10,643 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:10,643 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 18:22:10,651 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:22:10,651 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:22:10,741 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 81 check-sat command(s) [2018-12-03 18:22:10,741 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:22:10,745 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:22:14,367 INFO L134 CoverageAnalysis]: Checked inductivity of 6480 backedges. 0 proven. 6480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:14,367 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:22:22,243 INFO L134 CoverageAnalysis]: Checked inductivity of 6480 backedges. 0 proven. 6480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:22,261 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:22:22,261 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 243 [2018-12-03 18:22:22,261 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:22:22,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 164 states [2018-12-03 18:22:22,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2018-12-03 18:22:22,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26650, Invalid=33130, Unknown=0, NotChecked=0, Total=59780 [2018-12-03 18:22:22,264 INFO L87 Difference]: Start difference. First operand 164 states and 164 transitions. Second operand 164 states. [2018-12-03 18:22:22,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:22:22,667 INFO L93 Difference]: Finished difference Result 167 states and 167 transitions. [2018-12-03 18:22:22,667 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 18:22:22,667 INFO L78 Accepts]: Start accepts. Automaton has 164 states. Word has length 163 [2018-12-03 18:22:22,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:22:22,668 INFO L225 Difference]: With dead ends: 167 [2018-12-03 18:22:22,668 INFO L226 Difference]: Without dead ends: 166 [2018-12-03 18:22:22,669 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 243 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26082 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=26650, Invalid=33130, Unknown=0, NotChecked=0, Total=59780 [2018-12-03 18:22:22,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-12-03 18:22:22,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2018-12-03 18:22:22,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-12-03 18:22:22,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 166 transitions. [2018-12-03 18:22:22,674 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 166 transitions. Word has length 163 [2018-12-03 18:22:22,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:22:22,674 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 166 transitions. [2018-12-03 18:22:22,675 INFO L481 AbstractCegarLoop]: Interpolant automaton has 164 states. [2018-12-03 18:22:22,675 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 166 transitions. [2018-12-03 18:22:22,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-12-03 18:22:22,675 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:22:22,675 INFO L402 BasicCegarLoop]: trace histogram [82, 81, 1, 1] [2018-12-03 18:22:22,675 INFO L423 AbstractCegarLoop]: === Iteration 82 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:22:22,676 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:22:22,676 INFO L82 PathProgramCache]: Analyzing trace with hash -1262747198, now seen corresponding path program 81 times [2018-12-03 18:22:22,676 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:22:22,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:22,676 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:22:22,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:22,677 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:22:22,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:22:25,718 INFO L134 CoverageAnalysis]: Checked inductivity of 6642 backedges. 0 proven. 6642 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:25,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:25,719 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:22:25,719 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:22:25,719 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:22:25,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:25,719 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 18:22:25,728 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:22:25,729 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:22:25,776 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:22:25,776 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:22:25,779 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:22:29,531 INFO L134 CoverageAnalysis]: Checked inductivity of 6642 backedges. 0 proven. 6642 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:29,531 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:22:37,460 INFO L134 CoverageAnalysis]: Checked inductivity of 6642 backedges. 0 proven. 6642 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:37,478 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:22:37,479 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82, 82] total 246 [2018-12-03 18:22:37,479 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:22:37,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 166 states [2018-12-03 18:22:37,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 166 interpolants. [2018-12-03 18:22:37,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27307, Invalid=33949, Unknown=0, NotChecked=0, Total=61256 [2018-12-03 18:22:37,482 INFO L87 Difference]: Start difference. First operand 166 states and 166 transitions. Second operand 166 states. [2018-12-03 18:22:37,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:22:37,929 INFO L93 Difference]: Finished difference Result 169 states and 169 transitions. [2018-12-03 18:22:37,930 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2018-12-03 18:22:37,930 INFO L78 Accepts]: Start accepts. Automaton has 166 states. Word has length 165 [2018-12-03 18:22:37,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:22:37,931 INFO L225 Difference]: With dead ends: 169 [2018-12-03 18:22:37,931 INFO L226 Difference]: Without dead ends: 168 [2018-12-03 18:22:37,933 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 410 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 246 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26732 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=27307, Invalid=33949, Unknown=0, NotChecked=0, Total=61256 [2018-12-03 18:22:37,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2018-12-03 18:22:37,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2018-12-03 18:22:37,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-12-03 18:22:37,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 168 transitions. [2018-12-03 18:22:37,938 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 168 transitions. Word has length 165 [2018-12-03 18:22:37,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:22:37,938 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 168 transitions. [2018-12-03 18:22:37,938 INFO L481 AbstractCegarLoop]: Interpolant automaton has 166 states. [2018-12-03 18:22:37,938 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 168 transitions. [2018-12-03 18:22:37,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-12-03 18:22:37,939 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:22:37,939 INFO L402 BasicCegarLoop]: trace histogram [83, 82, 1, 1] [2018-12-03 18:22:37,939 INFO L423 AbstractCegarLoop]: === Iteration 83 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:22:37,939 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:22:37,940 INFO L82 PathProgramCache]: Analyzing trace with hash 1975688580, now seen corresponding path program 82 times [2018-12-03 18:22:37,940 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:22:37,940 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:37,940 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:22:37,940 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:37,940 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:22:37,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:22:40,989 INFO L134 CoverageAnalysis]: Checked inductivity of 6806 backedges. 0 proven. 6806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:40,989 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:40,989 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:22:40,989 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:22:40,989 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:22:40,989 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:40,990 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 18:22:41,000 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:22:41,000 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:22:41,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:22:41,043 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:22:44,727 INFO L134 CoverageAnalysis]: Checked inductivity of 6806 backedges. 0 proven. 6806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:44,728 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:22:52,806 INFO L134 CoverageAnalysis]: Checked inductivity of 6806 backedges. 0 proven. 6806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:52,824 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:22:52,825 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 249 [2018-12-03 18:22:52,825 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:22:52,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 168 states [2018-12-03 18:22:52,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 168 interpolants. [2018-12-03 18:22:52,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27972, Invalid=34778, Unknown=0, NotChecked=0, Total=62750 [2018-12-03 18:22:52,828 INFO L87 Difference]: Start difference. First operand 168 states and 168 transitions. Second operand 168 states. [2018-12-03 18:22:53,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:22:53,542 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2018-12-03 18:22:53,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-12-03 18:22:53,542 INFO L78 Accepts]: Start accepts. Automaton has 168 states. Word has length 167 [2018-12-03 18:22:53,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:22:53,543 INFO L225 Difference]: With dead ends: 171 [2018-12-03 18:22:53,543 INFO L226 Difference]: Without dead ends: 170 [2018-12-03 18:22:53,545 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 415 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 249 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27390 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=27972, Invalid=34778, Unknown=0, NotChecked=0, Total=62750 [2018-12-03 18:22:53,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2018-12-03 18:22:53,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 170. [2018-12-03 18:22:53,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2018-12-03 18:22:53,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 170 transitions. [2018-12-03 18:22:53,549 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 170 transitions. Word has length 167 [2018-12-03 18:22:53,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:22:53,549 INFO L480 AbstractCegarLoop]: Abstraction has 170 states and 170 transitions. [2018-12-03 18:22:53,549 INFO L481 AbstractCegarLoop]: Interpolant automaton has 168 states. [2018-12-03 18:22:53,549 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 170 transitions. [2018-12-03 18:22:53,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2018-12-03 18:22:53,550 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:22:53,550 INFO L402 BasicCegarLoop]: trace histogram [84, 83, 1, 1] [2018-12-03 18:22:53,550 INFO L423 AbstractCegarLoop]: === Iteration 84 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:22:53,550 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:22:53,550 INFO L82 PathProgramCache]: Analyzing trace with hash 261181638, now seen corresponding path program 83 times [2018-12-03 18:22:53,550 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:22:53,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:53,551 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:22:53,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:53,551 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:22:53,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:22:56,546 INFO L134 CoverageAnalysis]: Checked inductivity of 6972 backedges. 0 proven. 6972 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:56,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:56,546 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:22:56,546 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:22:56,547 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:22:56,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:56,547 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 18:22:56,555 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:22:56,556 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:22:56,651 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 84 check-sat command(s) [2018-12-03 18:22:56,651 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:22:56,654 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:23:00,312 INFO L134 CoverageAnalysis]: Checked inductivity of 6972 backedges. 0 proven. 6972 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:00,312 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:23:08,492 INFO L134 CoverageAnalysis]: Checked inductivity of 6972 backedges. 0 proven. 6972 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:08,510 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:23:08,510 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 252 [2018-12-03 18:23:08,510 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:23:08,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 170 states [2018-12-03 18:23:08,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 170 interpolants. [2018-12-03 18:23:08,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28645, Invalid=35617, Unknown=0, NotChecked=0, Total=64262 [2018-12-03 18:23:08,514 INFO L87 Difference]: Start difference. First operand 170 states and 170 transitions. Second operand 170 states. [2018-12-03 18:23:08,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:23:08,957 INFO L93 Difference]: Finished difference Result 173 states and 173 transitions. [2018-12-03 18:23:08,957 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-12-03 18:23:08,957 INFO L78 Accepts]: Start accepts. Automaton has 170 states. Word has length 169 [2018-12-03 18:23:08,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:23:08,958 INFO L225 Difference]: With dead ends: 173 [2018-12-03 18:23:08,958 INFO L226 Difference]: Without dead ends: 172 [2018-12-03 18:23:08,959 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 420 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28056 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=28645, Invalid=35617, Unknown=0, NotChecked=0, Total=64262 [2018-12-03 18:23:08,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-12-03 18:23:08,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2018-12-03 18:23:08,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-12-03 18:23:08,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 172 transitions. [2018-12-03 18:23:08,964 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 172 transitions. Word has length 169 [2018-12-03 18:23:08,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:23:08,964 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 172 transitions. [2018-12-03 18:23:08,964 INFO L481 AbstractCegarLoop]: Interpolant automaton has 170 states. [2018-12-03 18:23:08,964 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 172 transitions. [2018-12-03 18:23:08,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-12-03 18:23:08,965 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:23:08,965 INFO L402 BasicCegarLoop]: trace histogram [85, 84, 1, 1] [2018-12-03 18:23:08,965 INFO L423 AbstractCegarLoop]: === Iteration 85 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:23:08,965 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:23:08,965 INFO L82 PathProgramCache]: Analyzing trace with hash 1887452040, now seen corresponding path program 84 times [2018-12-03 18:23:08,965 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:23:08,966 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:23:08,966 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:23:08,966 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:23:08,966 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:23:08,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:23:11,950 INFO L134 CoverageAnalysis]: Checked inductivity of 7140 backedges. 0 proven. 7140 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:11,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:11,951 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:23:11,951 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:23:11,951 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:23:11,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:11,951 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 18:23:11,960 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:23:11,961 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:23:12,009 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:23:12,009 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:23:12,013 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:23:15,742 INFO L134 CoverageAnalysis]: Checked inductivity of 7140 backedges. 0 proven. 7140 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:15,742 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:23:23,931 INFO L134 CoverageAnalysis]: Checked inductivity of 7140 backedges. 0 proven. 7140 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:23,950 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:23:23,950 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 255 [2018-12-03 18:23:23,950 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:23:23,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 172 states [2018-12-03 18:23:23,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2018-12-03 18:23:23,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29326, Invalid=36466, Unknown=0, NotChecked=0, Total=65792 [2018-12-03 18:23:23,954 INFO L87 Difference]: Start difference. First operand 172 states and 172 transitions. Second operand 172 states. [2018-12-03 18:23:24,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:23:24,365 INFO L93 Difference]: Finished difference Result 175 states and 175 transitions. [2018-12-03 18:23:24,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-12-03 18:23:24,366 INFO L78 Accepts]: Start accepts. Automaton has 172 states. Word has length 171 [2018-12-03 18:23:24,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:23:24,367 INFO L225 Difference]: With dead ends: 175 [2018-12-03 18:23:24,367 INFO L226 Difference]: Without dead ends: 174 [2018-12-03 18:23:24,368 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 255 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28730 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=29326, Invalid=36466, Unknown=0, NotChecked=0, Total=65792 [2018-12-03 18:23:24,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2018-12-03 18:23:24,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 174. [2018-12-03 18:23:24,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-12-03 18:23:24,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 174 transitions. [2018-12-03 18:23:24,374 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 174 transitions. Word has length 171 [2018-12-03 18:23:24,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:23:24,375 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 174 transitions. [2018-12-03 18:23:24,375 INFO L481 AbstractCegarLoop]: Interpolant automaton has 172 states. [2018-12-03 18:23:24,375 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 174 transitions. [2018-12-03 18:23:24,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-12-03 18:23:24,376 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:23:24,376 INFO L402 BasicCegarLoop]: trace histogram [86, 85, 1, 1] [2018-12-03 18:23:24,376 INFO L423 AbstractCegarLoop]: === Iteration 86 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:23:24,376 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:23:24,377 INFO L82 PathProgramCache]: Analyzing trace with hash 1365212618, now seen corresponding path program 85 times [2018-12-03 18:23:24,377 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:23:24,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:23:24,377 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:23:24,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:23:24,378 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:23:24,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:23:27,442 INFO L134 CoverageAnalysis]: Checked inductivity of 7310 backedges. 0 proven. 7310 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:27,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:27,442 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:23:27,442 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:23:27,443 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:23:27,443 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:27,443 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 18:23:27,453 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:23:27,453 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:23:27,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:23:27,496 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:23:31,171 INFO L134 CoverageAnalysis]: Checked inductivity of 7310 backedges. 0 proven. 7310 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:31,171 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:23:39,557 INFO L134 CoverageAnalysis]: Checked inductivity of 7310 backedges. 0 proven. 7310 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:39,575 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:23:39,575 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86, 86] total 258 [2018-12-03 18:23:39,576 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:23:39,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 174 states [2018-12-03 18:23:39,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 174 interpolants. [2018-12-03 18:23:39,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30015, Invalid=37325, Unknown=0, NotChecked=0, Total=67340 [2018-12-03 18:23:39,579 INFO L87 Difference]: Start difference. First operand 174 states and 174 transitions. Second operand 174 states. [2018-12-03 18:23:40,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:23:40,001 INFO L93 Difference]: Finished difference Result 177 states and 177 transitions. [2018-12-03 18:23:40,001 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2018-12-03 18:23:40,001 INFO L78 Accepts]: Start accepts. Automaton has 174 states. Word has length 173 [2018-12-03 18:23:40,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:23:40,002 INFO L225 Difference]: With dead ends: 177 [2018-12-03 18:23:40,002 INFO L226 Difference]: Without dead ends: 176 [2018-12-03 18:23:40,003 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 258 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29412 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=30015, Invalid=37325, Unknown=0, NotChecked=0, Total=67340 [2018-12-03 18:23:40,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2018-12-03 18:23:40,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 176. [2018-12-03 18:23:40,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2018-12-03 18:23:40,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 176 transitions. [2018-12-03 18:23:40,009 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 176 transitions. Word has length 173 [2018-12-03 18:23:40,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:23:40,010 INFO L480 AbstractCegarLoop]: Abstraction has 176 states and 176 transitions. [2018-12-03 18:23:40,010 INFO L481 AbstractCegarLoop]: Interpolant automaton has 174 states. [2018-12-03 18:23:40,010 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 176 transitions. [2018-12-03 18:23:40,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2018-12-03 18:23:40,011 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:23:40,011 INFO L402 BasicCegarLoop]: trace histogram [87, 86, 1, 1] [2018-12-03 18:23:40,011 INFO L423 AbstractCegarLoop]: === Iteration 87 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:23:40,011 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:23:40,011 INFO L82 PathProgramCache]: Analyzing trace with hash 2004301708, now seen corresponding path program 86 times [2018-12-03 18:23:40,012 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:23:40,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:23:40,012 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:23:40,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:23:40,012 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:23:40,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:23:43,118 INFO L134 CoverageAnalysis]: Checked inductivity of 7482 backedges. 0 proven. 7482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:43,118 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:43,118 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:23:43,118 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:23:43,118 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:23:43,119 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:43,119 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 18:23:43,127 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:23:43,127 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:23:43,226 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 87 check-sat command(s) [2018-12-03 18:23:43,226 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:23:43,229 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:23:46,940 INFO L134 CoverageAnalysis]: Checked inductivity of 7482 backedges. 0 proven. 7482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:46,940 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:23:55,485 INFO L134 CoverageAnalysis]: Checked inductivity of 7482 backedges. 0 proven. 7482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:55,505 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:23:55,505 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 261 [2018-12-03 18:23:55,506 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:23:55,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 176 states [2018-12-03 18:23:55,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2018-12-03 18:23:55,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30712, Invalid=38194, Unknown=0, NotChecked=0, Total=68906 [2018-12-03 18:23:55,509 INFO L87 Difference]: Start difference. First operand 176 states and 176 transitions. Second operand 176 states. [2018-12-03 18:23:56,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:23:56,029 INFO L93 Difference]: Finished difference Result 179 states and 179 transitions. [2018-12-03 18:23:56,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-12-03 18:23:56,029 INFO L78 Accepts]: Start accepts. Automaton has 176 states. Word has length 175 [2018-12-03 18:23:56,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:23:56,030 INFO L225 Difference]: With dead ends: 179 [2018-12-03 18:23:56,030 INFO L226 Difference]: Without dead ends: 178 [2018-12-03 18:23:56,031 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 261 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30102 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=30712, Invalid=38194, Unknown=0, NotChecked=0, Total=68906 [2018-12-03 18:23:56,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-12-03 18:23:56,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2018-12-03 18:23:56,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-12-03 18:23:56,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 178 transitions. [2018-12-03 18:23:56,035 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 178 transitions. Word has length 175 [2018-12-03 18:23:56,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:23:56,035 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 178 transitions. [2018-12-03 18:23:56,035 INFO L481 AbstractCegarLoop]: Interpolant automaton has 176 states. [2018-12-03 18:23:56,035 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 178 transitions. [2018-12-03 18:23:56,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-12-03 18:23:56,036 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:23:56,036 INFO L402 BasicCegarLoop]: trace histogram [88, 87, 1, 1] [2018-12-03 18:23:56,036 INFO L423 AbstractCegarLoop]: === Iteration 88 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:23:56,036 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:23:56,036 INFO L82 PathProgramCache]: Analyzing trace with hash 1988593870, now seen corresponding path program 87 times [2018-12-03 18:23:56,036 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:23:56,037 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:23:56,037 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:23:56,037 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:23:56,037 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:23:56,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:23:59,134 INFO L134 CoverageAnalysis]: Checked inductivity of 7656 backedges. 0 proven. 7656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:59,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:59,135 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:23:59,135 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:23:59,135 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:23:59,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:59,135 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:23:59,146 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:23:59,146 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:23:59,191 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:23:59,192 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:23:59,195 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:24:03,190 INFO L134 CoverageAnalysis]: Checked inductivity of 7656 backedges. 0 proven. 7656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:03,190 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:24:11,927 INFO L134 CoverageAnalysis]: Checked inductivity of 7656 backedges. 0 proven. 7656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:11,947 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:24:11,948 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88, 88] total 264 [2018-12-03 18:24:11,948 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:24:11,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 178 states [2018-12-03 18:24:11,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 178 interpolants. [2018-12-03 18:24:11,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31417, Invalid=39073, Unknown=0, NotChecked=0, Total=70490 [2018-12-03 18:24:11,951 INFO L87 Difference]: Start difference. First operand 178 states and 178 transitions. Second operand 178 states. [2018-12-03 18:24:12,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:24:12,427 INFO L93 Difference]: Finished difference Result 181 states and 181 transitions. [2018-12-03 18:24:12,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2018-12-03 18:24:12,427 INFO L78 Accepts]: Start accepts. Automaton has 178 states. Word has length 177 [2018-12-03 18:24:12,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:24:12,428 INFO L225 Difference]: With dead ends: 181 [2018-12-03 18:24:12,428 INFO L226 Difference]: Without dead ends: 180 [2018-12-03 18:24:12,431 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 264 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30800 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=31417, Invalid=39073, Unknown=0, NotChecked=0, Total=70490 [2018-12-03 18:24:12,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-12-03 18:24:12,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 180. [2018-12-03 18:24:12,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-12-03 18:24:12,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 180 transitions. [2018-12-03 18:24:12,435 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 180 transitions. Word has length 177 [2018-12-03 18:24:12,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:24:12,435 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 180 transitions. [2018-12-03 18:24:12,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has 178 states. [2018-12-03 18:24:12,435 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 180 transitions. [2018-12-03 18:24:12,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-12-03 18:24:12,436 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:24:12,436 INFO L402 BasicCegarLoop]: trace histogram [89, 88, 1, 1] [2018-12-03 18:24:12,436 INFO L423 AbstractCegarLoop]: === Iteration 89 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:24:12,436 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:24:12,436 INFO L82 PathProgramCache]: Analyzing trace with hash -221736560, now seen corresponding path program 88 times [2018-12-03 18:24:12,436 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:24:12,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:24:12,437 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:24:12,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:24:12,437 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:24:12,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:24:15,681 INFO L134 CoverageAnalysis]: Checked inductivity of 7832 backedges. 0 proven. 7832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:15,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:24:15,681 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:24:15,681 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:24:15,681 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:24:15,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:24:15,681 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 18:24:15,690 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:24:15,690 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:24:15,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:24:15,734 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:24:19,677 INFO L134 CoverageAnalysis]: Checked inductivity of 7832 backedges. 0 proven. 7832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:19,677 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:24:28,642 INFO L134 CoverageAnalysis]: Checked inductivity of 7832 backedges. 0 proven. 7832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:28,660 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:24:28,661 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 267 [2018-12-03 18:24:28,661 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:24:28,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 180 states [2018-12-03 18:24:28,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 180 interpolants. [2018-12-03 18:24:28,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32130, Invalid=39962, Unknown=0, NotChecked=0, Total=72092 [2018-12-03 18:24:28,665 INFO L87 Difference]: Start difference. First operand 180 states and 180 transitions. Second operand 180 states. [2018-12-03 18:24:29,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:24:29,161 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2018-12-03 18:24:29,162 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 18:24:29,162 INFO L78 Accepts]: Start accepts. Automaton has 180 states. Word has length 179 [2018-12-03 18:24:29,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:24:29,162 INFO L225 Difference]: With dead ends: 183 [2018-12-03 18:24:29,163 INFO L226 Difference]: Without dead ends: 182 [2018-12-03 18:24:29,164 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 267 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31506 ImplicationChecksByTransitivity, 15.9s TimeCoverageRelationStatistics Valid=32130, Invalid=39962, Unknown=0, NotChecked=0, Total=72092 [2018-12-03 18:24:29,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-12-03 18:24:29,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 182. [2018-12-03 18:24:29,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-12-03 18:24:29,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 182 transitions. [2018-12-03 18:24:29,168 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 182 transitions. Word has length 179 [2018-12-03 18:24:29,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:24:29,168 INFO L480 AbstractCegarLoop]: Abstraction has 182 states and 182 transitions. [2018-12-03 18:24:29,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has 180 states. [2018-12-03 18:24:29,168 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 182 transitions. [2018-12-03 18:24:29,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2018-12-03 18:24:29,169 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:24:29,169 INFO L402 BasicCegarLoop]: trace histogram [90, 89, 1, 1] [2018-12-03 18:24:29,169 INFO L423 AbstractCegarLoop]: === Iteration 90 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:24:29,169 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:24:29,169 INFO L82 PathProgramCache]: Analyzing trace with hash 1659531730, now seen corresponding path program 89 times [2018-12-03 18:24:29,169 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:24:29,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:24:29,170 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:24:29,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:24:29,170 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:24:29,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:24:32,402 INFO L134 CoverageAnalysis]: Checked inductivity of 8010 backedges. 0 proven. 8010 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:32,402 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:24:32,402 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:24:32,402 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:24:32,403 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:24:32,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:24:32,403 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 18:24:32,410 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:24:32,410 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:24:32,557 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 90 check-sat command(s) [2018-12-03 18:24:32,557 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:24:32,560 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:24:36,565 INFO L134 CoverageAnalysis]: Checked inductivity of 8010 backedges. 0 proven. 8010 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:36,565 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:24:45,799 INFO L134 CoverageAnalysis]: Checked inductivity of 8010 backedges. 0 proven. 8010 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:45,818 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:24:45,818 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90, 90] total 270 [2018-12-03 18:24:45,818 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:24:45,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 182 states [2018-12-03 18:24:45,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 182 interpolants. [2018-12-03 18:24:45,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32851, Invalid=40861, Unknown=0, NotChecked=0, Total=73712 [2018-12-03 18:24:45,822 INFO L87 Difference]: Start difference. First operand 182 states and 182 transitions. Second operand 182 states. [2018-12-03 18:24:46,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:24:46,265 INFO L93 Difference]: Finished difference Result 185 states and 185 transitions. [2018-12-03 18:24:46,265 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2018-12-03 18:24:46,265 INFO L78 Accepts]: Start accepts. Automaton has 182 states. Word has length 181 [2018-12-03 18:24:46,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:24:46,267 INFO L225 Difference]: With dead ends: 185 [2018-12-03 18:24:46,267 INFO L226 Difference]: Without dead ends: 184 [2018-12-03 18:24:46,268 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 270 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32220 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=32851, Invalid=40861, Unknown=0, NotChecked=0, Total=73712 [2018-12-03 18:24:46,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-12-03 18:24:46,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 184. [2018-12-03 18:24:46,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-12-03 18:24:46,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 184 transitions. [2018-12-03 18:24:46,272 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 184 transitions. Word has length 181 [2018-12-03 18:24:46,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:24:46,272 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 184 transitions. [2018-12-03 18:24:46,272 INFO L481 AbstractCegarLoop]: Interpolant automaton has 182 states. [2018-12-03 18:24:46,272 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 184 transitions. [2018-12-03 18:24:46,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-12-03 18:24:46,272 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:24:46,273 INFO L402 BasicCegarLoop]: trace histogram [91, 90, 1, 1] [2018-12-03 18:24:46,273 INFO L423 AbstractCegarLoop]: === Iteration 91 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:24:46,273 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:24:46,273 INFO L82 PathProgramCache]: Analyzing trace with hash 1377126804, now seen corresponding path program 90 times [2018-12-03 18:24:46,273 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:24:46,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:24:46,273 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:24:46,274 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:24:46,274 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:24:46,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:24:49,565 INFO L134 CoverageAnalysis]: Checked inductivity of 8190 backedges. 0 proven. 8190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:49,566 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:24:49,566 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:24:49,566 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:24:49,566 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:24:49,566 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:24:49,566 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 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:24:49,574 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:24:49,574 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:24:49,623 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:24:49,623 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:24:49,627 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:24:53,698 INFO L134 CoverageAnalysis]: Checked inductivity of 8190 backedges. 0 proven. 8190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:53,698 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:25:02,989 INFO L134 CoverageAnalysis]: Checked inductivity of 8190 backedges. 0 proven. 8190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:03,008 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:25:03,008 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 273 [2018-12-03 18:25:03,008 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:25:03,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 184 states [2018-12-03 18:25:03,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 184 interpolants. [2018-12-03 18:25:03,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33580, Invalid=41770, Unknown=0, NotChecked=0, Total=75350 [2018-12-03 18:25:03,012 INFO L87 Difference]: Start difference. First operand 184 states and 184 transitions. Second operand 184 states. [2018-12-03 18:25:03,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:25:03,528 INFO L93 Difference]: Finished difference Result 187 states and 187 transitions. [2018-12-03 18:25:03,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-12-03 18:25:03,529 INFO L78 Accepts]: Start accepts. Automaton has 184 states. Word has length 183 [2018-12-03 18:25:03,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:25:03,529 INFO L225 Difference]: With dead ends: 187 [2018-12-03 18:25:03,529 INFO L226 Difference]: Without dead ends: 186 [2018-12-03 18:25:03,531 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 273 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32942 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=33580, Invalid=41770, Unknown=0, NotChecked=0, Total=75350 [2018-12-03 18:25:03,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-12-03 18:25:03,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 186. [2018-12-03 18:25:03,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-12-03 18:25:03,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 186 transitions. [2018-12-03 18:25:03,537 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 186 transitions. Word has length 183 [2018-12-03 18:25:03,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:25:03,537 INFO L480 AbstractCegarLoop]: Abstraction has 186 states and 186 transitions. [2018-12-03 18:25:03,537 INFO L481 AbstractCegarLoop]: Interpolant automaton has 184 states. [2018-12-03 18:25:03,538 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 186 transitions. [2018-12-03 18:25:03,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-12-03 18:25:03,538 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:25:03,539 INFO L402 BasicCegarLoop]: trace histogram [92, 91, 1, 1] [2018-12-03 18:25:03,539 INFO L423 AbstractCegarLoop]: === Iteration 92 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:25:03,539 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:25:03,539 INFO L82 PathProgramCache]: Analyzing trace with hash 568932566, now seen corresponding path program 91 times [2018-12-03 18:25:03,539 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:25:03,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:25:03,540 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:25:03,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:25:03,540 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:25:03,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:25:07,046 INFO L134 CoverageAnalysis]: Checked inductivity of 8372 backedges. 0 proven. 8372 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:07,046 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:25:07,046 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:25:07,046 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:25:07,046 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:25:07,047 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:25:07,047 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 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:25:07,057 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:25:07,057 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:25:07,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:25:07,103 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:25:11,308 INFO L134 CoverageAnalysis]: Checked inductivity of 8372 backedges. 0 proven. 8372 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:11,308 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:25:20,900 INFO L134 CoverageAnalysis]: Checked inductivity of 8372 backedges. 0 proven. 8372 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:20,918 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:25:20,919 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92, 92] total 276 [2018-12-03 18:25:20,919 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:25:20,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 186 states [2018-12-03 18:25:20,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 186 interpolants. [2018-12-03 18:25:20,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34317, Invalid=42689, Unknown=0, NotChecked=0, Total=77006 [2018-12-03 18:25:20,923 INFO L87 Difference]: Start difference. First operand 186 states and 186 transitions. Second operand 186 states. [2018-12-03 18:25:21,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:25:21,381 INFO L93 Difference]: Finished difference Result 189 states and 189 transitions. [2018-12-03 18:25:21,381 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2018-12-03 18:25:21,381 INFO L78 Accepts]: Start accepts. Automaton has 186 states. Word has length 185 [2018-12-03 18:25:21,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:25:21,382 INFO L225 Difference]: With dead ends: 189 [2018-12-03 18:25:21,382 INFO L226 Difference]: Without dead ends: 188 [2018-12-03 18:25:21,384 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 276 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33672 ImplicationChecksByTransitivity, 17.0s TimeCoverageRelationStatistics Valid=34317, Invalid=42689, Unknown=0, NotChecked=0, Total=77006 [2018-12-03 18:25:21,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2018-12-03 18:25:21,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 188. [2018-12-03 18:25:21,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2018-12-03 18:25:21,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 188 transitions. [2018-12-03 18:25:21,389 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 188 transitions. Word has length 185 [2018-12-03 18:25:21,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:25:21,390 INFO L480 AbstractCegarLoop]: Abstraction has 188 states and 188 transitions. [2018-12-03 18:25:21,390 INFO L481 AbstractCegarLoop]: Interpolant automaton has 186 states. [2018-12-03 18:25:21,390 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 188 transitions. [2018-12-03 18:25:21,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2018-12-03 18:25:21,391 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:25:21,391 INFO L402 BasicCegarLoop]: trace histogram [93, 92, 1, 1] [2018-12-03 18:25:21,391 INFO L423 AbstractCegarLoop]: === Iteration 93 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:25:21,391 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:25:21,391 INFO L82 PathProgramCache]: Analyzing trace with hash 1283350424, now seen corresponding path program 92 times [2018-12-03 18:25:21,392 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:25:21,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:25:21,392 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:25:21,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:25:21,392 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:25:21,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:25:24,883 INFO L134 CoverageAnalysis]: Checked inductivity of 8556 backedges. 0 proven. 8556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:24,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:25:24,883 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:25:24,883 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:25:24,883 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:25:24,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:25:24,883 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 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:25:24,893 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:25:24,893 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:25:25,007 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 93 check-sat command(s) [2018-12-03 18:25:25,007 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:25:25,010 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:25:29,256 INFO L134 CoverageAnalysis]: Checked inductivity of 8556 backedges. 0 proven. 8556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:29,256 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:25:38,967 INFO L134 CoverageAnalysis]: Checked inductivity of 8556 backedges. 0 proven. 8556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:38,986 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:25:38,986 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 279 [2018-12-03 18:25:38,986 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:25:38,987 INFO L459 AbstractCegarLoop]: Interpolant automaton has 188 states [2018-12-03 18:25:38,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2018-12-03 18:25:38,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35062, Invalid=43618, Unknown=0, NotChecked=0, Total=78680 [2018-12-03 18:25:38,990 INFO L87 Difference]: Start difference. First operand 188 states and 188 transitions. Second operand 188 states. [2018-12-03 18:25:39,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:25:39,572 INFO L93 Difference]: Finished difference Result 191 states and 191 transitions. [2018-12-03 18:25:39,572 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 18:25:39,573 INFO L78 Accepts]: Start accepts. Automaton has 188 states. Word has length 187 [2018-12-03 18:25:39,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:25:39,573 INFO L225 Difference]: With dead ends: 191 [2018-12-03 18:25:39,573 INFO L226 Difference]: Without dead ends: 190 [2018-12-03 18:25:39,575 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 279 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34410 ImplicationChecksByTransitivity, 17.2s TimeCoverageRelationStatistics Valid=35062, Invalid=43618, Unknown=0, NotChecked=0, Total=78680 [2018-12-03 18:25:39,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-12-03 18:25:39,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 190. [2018-12-03 18:25:39,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-12-03 18:25:39,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 190 transitions. [2018-12-03 18:25:39,580 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 190 transitions. Word has length 187 [2018-12-03 18:25:39,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:25:39,580 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 190 transitions. [2018-12-03 18:25:39,580 INFO L481 AbstractCegarLoop]: Interpolant automaton has 188 states. [2018-12-03 18:25:39,580 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 190 transitions. [2018-12-03 18:25:39,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-12-03 18:25:39,581 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:25:39,581 INFO L402 BasicCegarLoop]: trace histogram [94, 93, 1, 1] [2018-12-03 18:25:39,582 INFO L423 AbstractCegarLoop]: === Iteration 94 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:25:39,582 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:25:39,582 INFO L82 PathProgramCache]: Analyzing trace with hash 644144602, now seen corresponding path program 93 times [2018-12-03 18:25:39,582 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:25:39,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:25:39,583 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:25:39,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:25:39,583 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:25:39,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:25:43,147 INFO L134 CoverageAnalysis]: Checked inductivity of 8742 backedges. 0 proven. 8742 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:43,147 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:25:43,147 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:25:43,148 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:25:43,148 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:25:43,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:25:43,148 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 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:25:43,157 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:25:43,157 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:25:43,209 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:25:43,209 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:25:43,213 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:25:47,573 INFO L134 CoverageAnalysis]: Checked inductivity of 8742 backedges. 0 proven. 8742 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:47,573 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:25:57,594 INFO L134 CoverageAnalysis]: Checked inductivity of 8742 backedges. 0 proven. 8742 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:57,613 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:25:57,613 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94, 94] total 282 [2018-12-03 18:25:57,613 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:25:57,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 190 states [2018-12-03 18:25:57,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2018-12-03 18:25:57,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35815, Invalid=44557, Unknown=0, NotChecked=0, Total=80372 [2018-12-03 18:25:57,617 INFO L87 Difference]: Start difference. First operand 190 states and 190 transitions. Second operand 190 states. [2018-12-03 18:25:58,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:25:58,143 INFO L93 Difference]: Finished difference Result 193 states and 193 transitions. [2018-12-03 18:25:58,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2018-12-03 18:25:58,144 INFO L78 Accepts]: Start accepts. Automaton has 190 states. Word has length 189 [2018-12-03 18:25:58,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:25:58,145 INFO L225 Difference]: With dead ends: 193 [2018-12-03 18:25:58,145 INFO L226 Difference]: Without dead ends: 192 [2018-12-03 18:25:58,146 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 188 SyntacticMatches, 0 SemanticMatches, 282 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35156 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=35815, Invalid=44557, Unknown=0, NotChecked=0, Total=80372 [2018-12-03 18:25:58,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2018-12-03 18:25:58,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 192. [2018-12-03 18:25:58,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-12-03 18:25:58,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 192 transitions. [2018-12-03 18:25:58,150 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 192 transitions. Word has length 189 [2018-12-03 18:25:58,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:25:58,150 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 192 transitions. [2018-12-03 18:25:58,150 INFO L481 AbstractCegarLoop]: Interpolant automaton has 190 states. [2018-12-03 18:25:58,151 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 192 transitions. [2018-12-03 18:25:58,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-12-03 18:25:58,151 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:25:58,151 INFO L402 BasicCegarLoop]: trace histogram [95, 94, 1, 1] [2018-12-03 18:25:58,151 INFO L423 AbstractCegarLoop]: === Iteration 95 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:25:58,152 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:25:58,152 INFO L82 PathProgramCache]: Analyzing trace with hash 547672988, now seen corresponding path program 94 times [2018-12-03 18:25:58,152 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:25:58,152 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:25:58,152 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:25:58,152 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:25:58,152 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:25:58,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:26:01,784 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:01,784 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:26:01,784 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:26:01,784 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:26:01,784 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:26:01,785 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:26:01,785 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 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:26:01,794 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:26:01,794 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:26:01,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:26:01,842 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:26:06,304 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:06,304 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:26:16,498 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:16,516 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:26:16,517 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 285 [2018-12-03 18:26:16,517 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:26:16,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 192 states [2018-12-03 18:26:16,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2018-12-03 18:26:16,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36576, Invalid=45506, Unknown=0, NotChecked=0, Total=82082 [2018-12-03 18:26:16,521 INFO L87 Difference]: Start difference. First operand 192 states and 192 transitions. Second operand 192 states. [2018-12-03 18:26:17,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:26:17,014 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2018-12-03 18:26:17,014 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-12-03 18:26:17,014 INFO L78 Accepts]: Start accepts. Automaton has 192 states. Word has length 191 [2018-12-03 18:26:17,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:26:17,015 INFO L225 Difference]: With dead ends: 195 [2018-12-03 18:26:17,016 INFO L226 Difference]: Without dead ends: 194 [2018-12-03 18:26:17,018 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 285 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35910 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=36576, Invalid=45506, Unknown=0, NotChecked=0, Total=82082 [2018-12-03 18:26:17,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2018-12-03 18:26:17,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 194. [2018-12-03 18:26:17,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2018-12-03 18:26:17,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 194 transitions. [2018-12-03 18:26:17,024 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 194 transitions. Word has length 191 [2018-12-03 18:26:17,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:26:17,024 INFO L480 AbstractCegarLoop]: Abstraction has 194 states and 194 transitions. [2018-12-03 18:26:17,024 INFO L481 AbstractCegarLoop]: Interpolant automaton has 192 states. [2018-12-03 18:26:17,024 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 194 transitions. [2018-12-03 18:26:17,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2018-12-03 18:26:17,025 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:26:17,025 INFO L402 BasicCegarLoop]: trace histogram [96, 95, 1, 1] [2018-12-03 18:26:17,026 INFO L423 AbstractCegarLoop]: === Iteration 96 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:26:17,026 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:26:17,026 INFO L82 PathProgramCache]: Analyzing trace with hash -1967234850, now seen corresponding path program 95 times [2018-12-03 18:26:17,026 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:26:17,027 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:26:17,027 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:26:17,027 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:26:17,027 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:26:17,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:26:20,678 INFO L134 CoverageAnalysis]: Checked inductivity of 9120 backedges. 0 proven. 9120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:20,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:26:20,678 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:26:20,678 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:26:20,678 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:26:20,679 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:26:20,679 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 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:26:20,688 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:26:20,689 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:26:20,805 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 96 check-sat command(s) [2018-12-03 18:26:20,806 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:26:20,809 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:26:25,256 INFO L134 CoverageAnalysis]: Checked inductivity of 9120 backedges. 0 proven. 9120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:25,256 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:26:35,687 INFO L134 CoverageAnalysis]: Checked inductivity of 9120 backedges. 0 proven. 9120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:35,705 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:26:35,705 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 288 [2018-12-03 18:26:35,706 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:26:35,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 194 states [2018-12-03 18:26:35,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2018-12-03 18:26:35,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37345, Invalid=46465, Unknown=0, NotChecked=0, Total=83810 [2018-12-03 18:26:35,710 INFO L87 Difference]: Start difference. First operand 194 states and 194 transitions. Second operand 194 states. [2018-12-03 18:26:36,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:26:36,212 INFO L93 Difference]: Finished difference Result 197 states and 197 transitions. [2018-12-03 18:26:36,212 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2018-12-03 18:26:36,212 INFO L78 Accepts]: Start accepts. Automaton has 194 states. Word has length 193 [2018-12-03 18:26:36,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:26:36,213 INFO L225 Difference]: With dead ends: 197 [2018-12-03 18:26:36,213 INFO L226 Difference]: Without dead ends: 196 [2018-12-03 18:26:36,215 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 192 SyntacticMatches, 0 SemanticMatches, 288 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36672 ImplicationChecksByTransitivity, 18.2s TimeCoverageRelationStatistics Valid=37345, Invalid=46465, Unknown=0, NotChecked=0, Total=83810 [2018-12-03 18:26:36,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-12-03 18:26:36,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2018-12-03 18:26:36,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-12-03 18:26:36,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2018-12-03 18:26:36,219 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 193 [2018-12-03 18:26:36,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:26:36,219 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2018-12-03 18:26:36,219 INFO L481 AbstractCegarLoop]: Interpolant automaton has 194 states. [2018-12-03 18:26:36,219 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2018-12-03 18:26:36,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-12-03 18:26:36,220 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:26:36,220 INFO L402 BasicCegarLoop]: trace histogram [97, 96, 1, 1] [2018-12-03 18:26:36,220 INFO L423 AbstractCegarLoop]: === Iteration 97 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:26:36,220 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:26:36,220 INFO L82 PathProgramCache]: Analyzing trace with hash -727079520, now seen corresponding path program 96 times [2018-12-03 18:26:36,220 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:26:36,221 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:26:36,221 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:26:36,221 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:26:36,221 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:26:36,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:26:40,034 INFO L134 CoverageAnalysis]: Checked inductivity of 9312 backedges. 0 proven. 9312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:40,034 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:26:40,034 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:26:40,034 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:26:40,034 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:26:40,034 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:26:40,035 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 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:26:40,043 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:26:40,043 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:26:40,099 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:26:40,099 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:26:40,104 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:26:44,714 INFO L134 CoverageAnalysis]: Checked inductivity of 9312 backedges. 0 proven. 9312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:44,714 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:26:55,356 INFO L134 CoverageAnalysis]: Checked inductivity of 9312 backedges. 0 proven. 9312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:55,376 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:26:55,376 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 291 [2018-12-03 18:26:55,376 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:26:55,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 196 states [2018-12-03 18:26:55,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 196 interpolants. [2018-12-03 18:26:55,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38122, Invalid=47434, Unknown=0, NotChecked=0, Total=85556 [2018-12-03 18:26:55,381 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 196 states. [2018-12-03 18:26:55,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:26:55,963 INFO L93 Difference]: Finished difference Result 199 states and 199 transitions. [2018-12-03 18:26:55,963 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 18:26:55,963 INFO L78 Accepts]: Start accepts. Automaton has 196 states. Word has length 195 [2018-12-03 18:26:55,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:26:55,964 INFO L225 Difference]: With dead ends: 199 [2018-12-03 18:26:55,964 INFO L226 Difference]: Without dead ends: 198 [2018-12-03 18:26:55,965 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 291 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37442 ImplicationChecksByTransitivity, 18.7s TimeCoverageRelationStatistics Valid=38122, Invalid=47434, Unknown=0, NotChecked=0, Total=85556 [2018-12-03 18:26:55,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2018-12-03 18:26:55,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 198. [2018-12-03 18:26:55,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-12-03 18:26:55,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 198 transitions. [2018-12-03 18:26:55,971 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 198 transitions. Word has length 195 [2018-12-03 18:26:55,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:26:55,971 INFO L480 AbstractCegarLoop]: Abstraction has 198 states and 198 transitions. [2018-12-03 18:26:55,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has 196 states. [2018-12-03 18:26:55,971 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 198 transitions. [2018-12-03 18:26:55,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-12-03 18:26:55,972 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:26:55,972 INFO L402 BasicCegarLoop]: trace histogram [98, 97, 1, 1] [2018-12-03 18:26:55,972 INFO L423 AbstractCegarLoop]: === Iteration 98 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:26:55,972 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:26:55,973 INFO L82 PathProgramCache]: Analyzing trace with hash 1356251618, now seen corresponding path program 97 times [2018-12-03 18:26:55,973 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:26:55,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:26:55,973 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:26:55,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:26:55,974 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:26:56,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:26:59,787 INFO L134 CoverageAnalysis]: Checked inductivity of 9506 backedges. 0 proven. 9506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:59,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:26:59,788 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:26:59,788 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:26:59,788 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:26:59,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:26:59,788 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 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:26:59,797 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:26:59,797 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:26:59,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:26:59,846 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:27:04,598 INFO L134 CoverageAnalysis]: Checked inductivity of 9506 backedges. 0 proven. 9506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:27:04,598 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:27:15,486 INFO L134 CoverageAnalysis]: Checked inductivity of 9506 backedges. 0 proven. 9506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:27:15,505 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:27:15,505 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98, 98] total 294 [2018-12-03 18:27:15,505 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:27:15,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 198 states [2018-12-03 18:27:15,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 198 interpolants. [2018-12-03 18:27:15,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38907, Invalid=48413, Unknown=0, NotChecked=0, Total=87320 [2018-12-03 18:27:15,509 INFO L87 Difference]: Start difference. First operand 198 states and 198 transitions. Second operand 198 states. [2018-12-03 18:27:16,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:27:16,095 INFO L93 Difference]: Finished difference Result 201 states and 201 transitions. [2018-12-03 18:27:16,095 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2018-12-03 18:27:16,095 INFO L78 Accepts]: Start accepts. Automaton has 198 states. Word has length 197 [2018-12-03 18:27:16,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:27:16,096 INFO L225 Difference]: With dead ends: 201 [2018-12-03 18:27:16,096 INFO L226 Difference]: Without dead ends: 200 [2018-12-03 18:27:16,098 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 196 SyntacticMatches, 0 SemanticMatches, 294 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38220 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=38907, Invalid=48413, Unknown=0, NotChecked=0, Total=87320 [2018-12-03 18:27:16,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2018-12-03 18:27:16,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 200. [2018-12-03 18:27:16,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2018-12-03 18:27:16,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 200 transitions. [2018-12-03 18:27:16,102 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 200 transitions. Word has length 197 [2018-12-03 18:27:16,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:27:16,102 INFO L480 AbstractCegarLoop]: Abstraction has 200 states and 200 transitions. [2018-12-03 18:27:16,102 INFO L481 AbstractCegarLoop]: Interpolant automaton has 198 states. [2018-12-03 18:27:16,102 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 200 transitions. [2018-12-03 18:27:16,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2018-12-03 18:27:16,103 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:27:16,103 INFO L402 BasicCegarLoop]: trace histogram [99, 98, 1, 1] [2018-12-03 18:27:16,103 INFO L423 AbstractCegarLoop]: === Iteration 99 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:27:16,103 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:27:16,103 INFO L82 PathProgramCache]: Analyzing trace with hash 1982715300, now seen corresponding path program 98 times [2018-12-03 18:27:16,103 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:27:16,104 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:27:16,104 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:27:16,104 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:27:16,104 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:27:16,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat