java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf -i ../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/PointerIncrement-simplified03.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-1de736e-m [2019-02-18 09:58:27,323 INFO L170 SettingsManager]: Resetting all preferences to default values... [2019-02-18 09:58:27,325 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2019-02-18 09:58:27,338 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-02-18 09:58:27,339 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-02-18 09:58:27,340 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-02-18 09:58:27,341 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-02-18 09:58:27,343 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2019-02-18 09:58:27,345 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-02-18 09:58:27,346 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-02-18 09:58:27,347 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2019-02-18 09:58:27,372 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf [2019-02-18 09:58:27,386 INFO L110 SettingsManager]: Loading preferences was successful [2019-02-18 09:58:27,386 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2019-02-18 09:58:27,387 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2019-02-18 09:58:27,387 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2019-02-18 09:58:27,388 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-02-18 09:58:27,388 INFO L133 SettingsManager]: * User list type=DISABLED [2019-02-18 09:58:27,388 INFO L133 SettingsManager]: * Inline calls to unimplemented procedures=true [2019-02-18 09:58:27,388 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-02-18 09:58:27,388 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-02-18 09:58:27,389 INFO L133 SettingsManager]: * Underlying domain=OctagonDomain [2019-02-18 09:58:27,389 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2019-02-18 09:58:27,389 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-02-18 09:58:27,389 INFO L133 SettingsManager]: * Interval Domain=false [2019-02-18 09:58:27,390 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-02-18 09:58:27,390 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2019-02-18 09:58:27,390 INFO L133 SettingsManager]: * Use SBE=true [2019-02-18 09:58:27,391 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-02-18 09:58:27,391 INFO L133 SettingsManager]: * sizeof long=4 [2019-02-18 09:58:27,391 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2019-02-18 09:58:27,391 INFO L133 SettingsManager]: * sizeof POINTER=4 [2019-02-18 09:58:27,391 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2019-02-18 09:58:27,392 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-02-18 09:58:27,392 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-02-18 09:58:27,392 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-02-18 09:58:27,392 INFO L133 SettingsManager]: * sizeof long double=12 [2019-02-18 09:58:27,392 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2019-02-18 09:58:27,393 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-02-18 09:58:27,393 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-02-18 09:58:27,393 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-02-18 09:58:27,393 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2019-02-18 09:58:27,394 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:8092 -smt2 -in -t:10000 [2019-02-18 09:58:27,394 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-02-18 09:58:27,394 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-02-18 09:58:27,394 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-02-18 09:58:27,394 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-02-18 09:58:27,395 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-02-18 09:58:27,395 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:8092 -smt2 -in [2019-02-18 09:58:27,395 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-02-18 09:58:27,395 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-02-18 09:58:27,428 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-02-18 09:58:27,442 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-02-18 09:58:27,448 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-02-18 09:58:27,452 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2019-02-18 09:58:27,453 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2019-02-18 09:58:27,454 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/PointerIncrement-simplified03.bpl [2019-02-18 09:58:27,454 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/PointerIncrement-simplified03.bpl' [2019-02-18 09:58:27,511 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-02-18 09:58:27,513 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-02-18 09:58:27,513 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-02-18 09:58:27,514 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-02-18 09:58:27,514 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2019-02-18 09:58:27,532 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:58:27" (1/1) ... [2019-02-18 09:58:27,547 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:58:27" (1/1) ... [2019-02-18 09:58:27,555 WARN L165 Inliner]: Program contained no entry procedure! [2019-02-18 09:58:27,556 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2019-02-18 09:58:27,556 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2019-02-18 09:58:27,573 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-02-18 09:58:27,574 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-02-18 09:58:27,574 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-02-18 09:58:27,574 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2019-02-18 09:58:27,588 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:58:27" (1/1) ... [2019-02-18 09:58:27,588 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:58:27" (1/1) ... [2019-02-18 09:58:27,589 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:58:27" (1/1) ... [2019-02-18 09:58:27,590 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:58:27" (1/1) ... [2019-02-18 09:58:27,593 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:58:27" (1/1) ... [2019-02-18 09:58:27,597 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:58:27" (1/1) ... [2019-02-18 09:58:27,599 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:58:27" (1/1) ... [2019-02-18 09:58:27,600 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-02-18 09:58:27,601 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-02-18 09:58:27,601 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-02-18 09:58:27,601 INFO L276 PluginConnector]: RCFGBuilder initialized [2019-02-18 09:58:27,602 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:58:27" (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:8092 -smt2 -in -t:10000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:8092 -smt2 -in -t:10000 [2019-02-18 09:58:27,681 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-02-18 09:58:27,681 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-02-18 09:58:27,681 INFO L130 BoogieDeclarations]: Found specification of procedure ~malloc [2019-02-18 09:58:27,894 INFO L278 CfgBuilder]: Using library mode [2019-02-18 09:58:27,895 INFO L286 CfgBuilder]: Removed 3 assue(true) statements. [2019-02-18 09:58:27,896 INFO L202 PluginConnector]: Adding new model PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.02 09:58:27 BoogieIcfgContainer [2019-02-18 09:58:27,897 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-02-18 09:58:27,898 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-02-18 09:58:27,898 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-02-18 09:58:27,901 INFO L276 PluginConnector]: TraceAbstraction initialized [2019-02-18 09:58:27,901 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:58:27" (1/2) ... [2019-02-18 09:58:27,902 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14f75248 and model type PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.02 09:58:27, skipping insertion in model container [2019-02-18 09:58:27,903 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.02 09:58:27" (2/2) ... [2019-02-18 09:58:27,904 INFO L112 eAbstractionObserver]: Analyzing ICFG PointerIncrement-simplified03.bpl [2019-02-18 09:58:27,916 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-02-18 09:58:27,927 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-02-18 09:58:27,946 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-02-18 09:58:27,985 INFO L382 AbstractCegarLoop]: Interprodecural is true [2019-02-18 09:58:27,985 INFO L383 AbstractCegarLoop]: Hoare is true [2019-02-18 09:58:27,985 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-02-18 09:58:27,986 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-02-18 09:58:27,986 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-02-18 09:58:27,986 INFO L387 AbstractCegarLoop]: Difference is false [2019-02-18 09:58:27,986 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-02-18 09:58:27,986 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-02-18 09:58:28,005 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2019-02-18 09:58:28,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2019-02-18 09:58:28,020 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:28,022 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2019-02-18 09:58:28,025 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:28,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:28,033 INFO L82 PathProgramCache]: Analyzing trace with hash 29984, now seen corresponding path program 1 times [2019-02-18 09:58:28,036 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:28,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:28,085 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:58:28,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:28,085 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:28,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:28,248 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:28,250 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-02-18 09:58:28,251 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2019-02-18 09:58:28,251 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-02-18 09:58:28,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-02-18 09:58:28,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-02-18 09:58:28,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-02-18 09:58:28,268 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2019-02-18 09:58:28,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:28,384 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2019-02-18 09:58:28,385 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-02-18 09:58:28,387 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2019-02-18 09:58:28,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:28,401 INFO L225 Difference]: With dead ends: 15 [2019-02-18 09:58:28,401 INFO L226 Difference]: Without dead ends: 8 [2019-02-18 09:58:28,406 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 [2019-02-18 09:58:28,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2019-02-18 09:58:28,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 7. [2019-02-18 09:58:28,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2019-02-18 09:58:28,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2019-02-18 09:58:28,456 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 3 [2019-02-18 09:58:28,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:28,456 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2019-02-18 09:58:28,457 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-02-18 09:58:28,457 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2019-02-18 09:58:28,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-02-18 09:58:28,457 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:28,458 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2019-02-18 09:58:28,460 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:28,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:28,461 INFO L82 PathProgramCache]: Analyzing trace with hash 893294860, now seen corresponding path program 1 times [2019-02-18 09:58:28,461 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:28,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:28,465 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:58:28,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:28,466 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:28,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:28,564 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:28,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:28,565 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:28,566 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 7 with the following transitions: [2019-02-18 09:58:28,568 INFO L207 CegarAbsIntRunner]: [0], [6], [7], [8], [12] [2019-02-18 09:58:28,638 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2019-02-18 09:58:28,638 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2019-02-18 09:58:38,123 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-02-18 09:58:38,124 INFO L272 AbstractInterpreter]: Visited 5 different actions 38 times. Merged at 4 different actions 33 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2019-02-18 09:58:38,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:38,130 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-02-18 09:58:38,130 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:38,131 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:58:38,142 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:58:38,142 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:58:38,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:38,173 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:38,215 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:38,216 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:38,249 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:38,250 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:38,398 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:38,399 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:38,427 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:38,451 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:38,451 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2019-02-18 09:58:38,452 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:38,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-02-18 09:58:38,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-02-18 09:58:38,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2019-02-18 09:58:38,455 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 6 states. [2019-02-18 09:58:38,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:38,503 INFO L93 Difference]: Finished difference Result 12 states and 12 transitions. [2019-02-18 09:58:38,504 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-02-18 09:58:38,504 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2019-02-18 09:58:38,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:38,505 INFO L225 Difference]: With dead ends: 12 [2019-02-18 09:58:38,505 INFO L226 Difference]: Without dead ends: 11 [2019-02-18 09:58:38,506 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2019-02-18 09:58:38,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2019-02-18 09:58:38,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 10. [2019-02-18 09:58:38,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2019-02-18 09:58:38,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2019-02-18 09:58:38,510 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 6 [2019-02-18 09:58:38,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:38,510 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2019-02-18 09:58:38,510 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-02-18 09:58:38,511 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2019-02-18 09:58:38,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-02-18 09:58:38,511 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:38,511 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1] [2019-02-18 09:58:38,512 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:38,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:38,512 INFO L82 PathProgramCache]: Analyzing trace with hash 529849760, now seen corresponding path program 2 times [2019-02-18 09:58:38,512 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:38,513 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:38,514 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:58:38,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:38,514 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:38,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:38,655 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:38,656 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:38,656 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:38,656 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:38,656 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:38,656 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:38,657 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:58:38,666 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:58:38,667 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:58:38,699 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-02-18 09:58:38,700 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:58:38,702 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:38,736 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:38,736 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:38,747 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:38,748 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:39,081 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:39,082 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:39,129 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:39,150 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:39,150 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2019-02-18 09:58:39,150 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:39,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-02-18 09:58:39,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-02-18 09:58:39,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2019-02-18 09:58:39,152 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 8 states. [2019-02-18 09:58:39,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:39,211 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2019-02-18 09:58:39,211 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-02-18 09:58:39,212 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 9 [2019-02-18 09:58:39,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:39,212 INFO L225 Difference]: With dead ends: 15 [2019-02-18 09:58:39,213 INFO L226 Difference]: Without dead ends: 14 [2019-02-18 09:58:39,213 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2019-02-18 09:58:39,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-02-18 09:58:39,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2019-02-18 09:58:39,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-02-18 09:58:39,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-02-18 09:58:39,217 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 9 [2019-02-18 09:58:39,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:39,217 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-02-18 09:58:39,217 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-02-18 09:58:39,218 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-02-18 09:58:39,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-02-18 09:58:39,218 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:39,218 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1] [2019-02-18 09:58:39,219 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:39,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:39,219 INFO L82 PathProgramCache]: Analyzing trace with hash 749428876, now seen corresponding path program 3 times [2019-02-18 09:58:39,219 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:39,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:39,220 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:58:39,221 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:39,221 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:39,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:39,331 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:39,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:39,332 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:39,332 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:39,332 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:39,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:39,333 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 09:58:39,343 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:58:39,344 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:58:39,367 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:58:39,368 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:58:39,369 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:39,383 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:39,384 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:39,399 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:39,399 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:39,666 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:39,666 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:39,713 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:39,733 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:39,733 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2019-02-18 09:58:39,734 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:39,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-02-18 09:58:39,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-02-18 09:58:39,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=97, Unknown=0, NotChecked=0, Total=182 [2019-02-18 09:58:39,735 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 10 states. [2019-02-18 09:58:40,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:40,085 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2019-02-18 09:58:40,085 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-02-18 09:58:40,085 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 12 [2019-02-18 09:58:40,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:40,086 INFO L225 Difference]: With dead ends: 18 [2019-02-18 09:58:40,086 INFO L226 Difference]: Without dead ends: 17 [2019-02-18 09:58:40,087 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=85, Invalid=97, Unknown=0, NotChecked=0, Total=182 [2019-02-18 09:58:40,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-02-18 09:58:40,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2019-02-18 09:58:40,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-02-18 09:58:40,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-02-18 09:58:40,090 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 12 [2019-02-18 09:58:40,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:40,090 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-02-18 09:58:40,090 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-02-18 09:58:40,090 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-02-18 09:58:40,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-02-18 09:58:40,091 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:40,091 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1] [2019-02-18 09:58:40,091 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:40,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:40,092 INFO L82 PathProgramCache]: Analyzing trace with hash 995681824, now seen corresponding path program 4 times [2019-02-18 09:58:40,092 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:40,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:40,093 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:58:40,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:40,093 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:40,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:40,201 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:40,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:40,202 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:40,202 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:40,203 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:40,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:40,203 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:58:40,221 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:58:40,221 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:58:40,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:40,234 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:40,238 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:40,239 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:40,249 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:40,250 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:40,386 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:40,386 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:40,445 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:40,465 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:40,466 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 15 [2019-02-18 09:58:40,466 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:40,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-02-18 09:58:40,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-02-18 09:58:40,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=146, Unknown=0, NotChecked=0, Total=272 [2019-02-18 09:58:40,467 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 12 states. [2019-02-18 09:58:40,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:40,515 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2019-02-18 09:58:40,518 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-02-18 09:58:40,518 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 15 [2019-02-18 09:58:40,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:40,519 INFO L225 Difference]: With dead ends: 21 [2019-02-18 09:58:40,520 INFO L226 Difference]: Without dead ends: 20 [2019-02-18 09:58:40,520 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=126, Invalid=146, Unknown=0, NotChecked=0, Total=272 [2019-02-18 09:58:40,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-02-18 09:58:40,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2019-02-18 09:58:40,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-02-18 09:58:40,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2019-02-18 09:58:40,524 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 15 [2019-02-18 09:58:40,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:40,524 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2019-02-18 09:58:40,525 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-02-18 09:58:40,525 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2019-02-18 09:58:40,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-02-18 09:58:40,525 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:40,525 INFO L402 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1] [2019-02-18 09:58:40,526 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:40,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:40,526 INFO L82 PathProgramCache]: Analyzing trace with hash 1313114124, now seen corresponding path program 5 times [2019-02-18 09:58:40,526 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:40,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:40,527 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:58:40,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:40,528 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:40,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:40,642 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:40,643 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:40,643 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:40,643 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:40,644 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:40,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:40,644 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:58:40,653 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:58:40,654 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:58:40,671 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-02-18 09:58:40,672 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:58:40,674 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:40,680 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:40,681 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:40,694 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:40,694 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:40,789 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:40,789 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:40,920 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:40,939 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:40,939 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 18 [2019-02-18 09:58:40,939 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:40,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-02-18 09:58:40,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-02-18 09:58:40,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=205, Unknown=0, NotChecked=0, Total=380 [2019-02-18 09:58:40,942 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 14 states. [2019-02-18 09:58:41,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:41,006 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2019-02-18 09:58:41,010 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-02-18 09:58:41,010 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 18 [2019-02-18 09:58:41,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:41,011 INFO L225 Difference]: With dead ends: 24 [2019-02-18 09:58:41,011 INFO L226 Difference]: Without dead ends: 23 [2019-02-18 09:58:41,012 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=175, Invalid=205, Unknown=0, NotChecked=0, Total=380 [2019-02-18 09:58:41,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-02-18 09:58:41,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2019-02-18 09:58:41,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-02-18 09:58:41,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2019-02-18 09:58:41,015 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 18 [2019-02-18 09:58:41,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:41,015 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2019-02-18 09:58:41,016 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-02-18 09:58:41,016 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2019-02-18 09:58:41,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-02-18 09:58:41,016 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:41,017 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1] [2019-02-18 09:58:41,017 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:41,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:41,017 INFO L82 PathProgramCache]: Analyzing trace with hash 420777632, now seen corresponding path program 6 times [2019-02-18 09:58:41,017 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:41,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:41,018 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:58:41,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:41,018 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:41,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:41,160 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:41,160 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:41,160 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:41,161 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:41,161 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:41,161 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:41,161 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:58:41,171 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:58:41,171 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:58:41,201 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:58:41,201 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:58:41,203 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:41,209 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:41,209 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:41,220 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:41,221 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:41,324 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:41,324 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:41,421 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:41,442 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:41,442 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 21 [2019-02-18 09:58:41,442 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:41,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-02-18 09:58:41,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-02-18 09:58:41,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=274, Unknown=0, NotChecked=0, Total=506 [2019-02-18 09:58:41,444 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 16 states. [2019-02-18 09:58:41,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:41,532 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2019-02-18 09:58:41,534 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-02-18 09:58:41,534 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 21 [2019-02-18 09:58:41,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:41,535 INFO L225 Difference]: With dead ends: 27 [2019-02-18 09:58:41,535 INFO L226 Difference]: Without dead ends: 26 [2019-02-18 09:58:41,536 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=232, Invalid=274, Unknown=0, NotChecked=0, Total=506 [2019-02-18 09:58:41,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-02-18 09:58:41,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2019-02-18 09:58:41,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-02-18 09:58:41,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2019-02-18 09:58:41,540 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 21 [2019-02-18 09:58:41,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:41,540 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2019-02-18 09:58:41,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-02-18 09:58:41,541 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2019-02-18 09:58:41,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-02-18 09:58:41,541 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:41,542 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1] [2019-02-18 09:58:41,542 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:41,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:41,542 INFO L82 PathProgramCache]: Analyzing trace with hash -1623060596, now seen corresponding path program 7 times [2019-02-18 09:58:41,542 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:41,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:41,543 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:58:41,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:41,544 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:41,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:41,671 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:41,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:41,672 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:41,672 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:41,672 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:41,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:41,673 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:58:41,683 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:58:41,683 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:58:41,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:41,710 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:41,722 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:41,723 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:41,731 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:41,731 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:41,864 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:41,864 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:42,007 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:42,027 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:42,027 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 24 [2019-02-18 09:58:42,027 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:42,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-02-18 09:58:42,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-02-18 09:58:42,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=353, Unknown=0, NotChecked=0, Total=650 [2019-02-18 09:58:42,029 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 18 states. [2019-02-18 09:58:42,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:42,230 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2019-02-18 09:58:42,230 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-02-18 09:58:42,230 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 24 [2019-02-18 09:58:42,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:42,231 INFO L225 Difference]: With dead ends: 30 [2019-02-18 09:58:42,231 INFO L226 Difference]: Without dead ends: 29 [2019-02-18 09:58:42,232 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=297, Invalid=353, Unknown=0, NotChecked=0, Total=650 [2019-02-18 09:58:42,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-02-18 09:58:42,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2019-02-18 09:58:42,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-02-18 09:58:42,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2019-02-18 09:58:42,237 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 24 [2019-02-18 09:58:42,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:42,237 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2019-02-18 09:58:42,237 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-02-18 09:58:42,237 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2019-02-18 09:58:42,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-02-18 09:58:42,238 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:42,238 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1] [2019-02-18 09:58:42,238 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:42,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:42,239 INFO L82 PathProgramCache]: Analyzing trace with hash 143644448, now seen corresponding path program 8 times [2019-02-18 09:58:42,239 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:42,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:42,239 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:58:42,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:42,239 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:42,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:42,372 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:42,373 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:42,373 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:42,373 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:42,373 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:42,373 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:42,374 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:58:42,391 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:58:42,391 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:58:42,419 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-02-18 09:58:42,419 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:58:42,422 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:42,430 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:42,431 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:42,439 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:42,440 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:42,573 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:42,573 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:42,752 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:42,794 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:42,794 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 27 [2019-02-18 09:58:42,794 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:42,795 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-02-18 09:58:42,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-02-18 09:58:42,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=442, Unknown=0, NotChecked=0, Total=812 [2019-02-18 09:58:42,797 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2019-02-18 09:58:42,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:42,975 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2019-02-18 09:58:42,976 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-02-18 09:58:42,976 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2019-02-18 09:58:42,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:42,977 INFO L225 Difference]: With dead ends: 33 [2019-02-18 09:58:42,978 INFO L226 Difference]: Without dead ends: 32 [2019-02-18 09:58:42,979 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=370, Invalid=442, Unknown=0, NotChecked=0, Total=812 [2019-02-18 09:58:42,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-02-18 09:58:42,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2019-02-18 09:58:42,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-02-18 09:58:42,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2019-02-18 09:58:42,983 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 27 [2019-02-18 09:58:42,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:42,984 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2019-02-18 09:58:42,984 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-02-18 09:58:42,984 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2019-02-18 09:58:42,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-02-18 09:58:42,985 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:42,985 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1] [2019-02-18 09:58:42,985 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:42,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:42,985 INFO L82 PathProgramCache]: Analyzing trace with hash 1524365068, now seen corresponding path program 9 times [2019-02-18 09:58:42,985 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:42,986 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:42,987 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:58:42,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:42,987 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:42,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:43,182 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:43,182 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:43,183 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:43,183 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:43,183 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:43,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:43,183 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:58:43,193 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:58:43,193 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:58:43,220 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:58:43,220 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:58:43,223 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:43,243 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:43,244 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:43,265 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:43,266 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:43,424 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:43,425 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:43,712 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:43,731 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:43,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 30 [2019-02-18 09:58:43,731 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:43,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-02-18 09:58:43,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-02-18 09:58:43,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=541, Unknown=0, NotChecked=0, Total=992 [2019-02-18 09:58:43,733 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 22 states. [2019-02-18 09:58:43,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:43,813 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2019-02-18 09:58:43,813 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-02-18 09:58:43,813 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 30 [2019-02-18 09:58:43,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:43,815 INFO L225 Difference]: With dead ends: 36 [2019-02-18 09:58:43,815 INFO L226 Difference]: Without dead ends: 35 [2019-02-18 09:58:43,816 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=451, Invalid=541, Unknown=0, NotChecked=0, Total=992 [2019-02-18 09:58:43,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-02-18 09:58:43,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2019-02-18 09:58:43,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-02-18 09:58:43,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2019-02-18 09:58:43,821 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 30 [2019-02-18 09:58:43,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:43,821 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2019-02-18 09:58:43,821 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-02-18 09:58:43,821 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2019-02-18 09:58:43,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-02-18 09:58:43,822 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:43,822 INFO L402 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1] [2019-02-18 09:58:43,822 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:43,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:43,823 INFO L82 PathProgramCache]: Analyzing trace with hash 1670561696, now seen corresponding path program 10 times [2019-02-18 09:58:43,823 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:43,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:43,824 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:58:43,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:43,824 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:43,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:43,989 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:43,989 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:43,989 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:43,990 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:43,990 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:43,990 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:43,990 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:58:44,000 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:58:44,000 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:58:44,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:44,029 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:44,047 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:44,048 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:44,064 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:44,064 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:44,210 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:44,210 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:44,400 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:44,420 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:44,420 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 33 [2019-02-18 09:58:44,420 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:44,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-02-18 09:58:44,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-02-18 09:58:44,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=650, Unknown=0, NotChecked=0, Total=1190 [2019-02-18 09:58:44,422 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 24 states. [2019-02-18 09:58:44,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:44,516 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2019-02-18 09:58:44,517 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-02-18 09:58:44,517 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 33 [2019-02-18 09:58:44,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:44,518 INFO L225 Difference]: With dead ends: 39 [2019-02-18 09:58:44,518 INFO L226 Difference]: Without dead ends: 38 [2019-02-18 09:58:44,519 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=540, Invalid=650, Unknown=0, NotChecked=0, Total=1190 [2019-02-18 09:58:44,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-02-18 09:58:44,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2019-02-18 09:58:44,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-02-18 09:58:44,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2019-02-18 09:58:44,523 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 33 [2019-02-18 09:58:44,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:44,524 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2019-02-18 09:58:44,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-02-18 09:58:44,524 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2019-02-18 09:58:44,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-02-18 09:58:44,525 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:44,525 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1] [2019-02-18 09:58:44,525 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:44,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:44,526 INFO L82 PathProgramCache]: Analyzing trace with hash 1917468300, now seen corresponding path program 11 times [2019-02-18 09:58:44,526 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:44,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:44,527 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:58:44,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:44,527 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:44,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:44,731 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:44,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:44,731 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:44,731 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:44,732 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:44,732 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:44,732 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:58:44,741 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:58:44,742 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:58:44,784 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-02-18 09:58:44,784 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:58:44,787 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:44,796 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:44,797 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:44,808 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:44,808 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:45,281 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:45,282 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:45,511 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:45,531 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:45,532 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 36 [2019-02-18 09:58:45,532 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:45,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-02-18 09:58:45,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-02-18 09:58:45,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=637, Invalid=769, Unknown=0, NotChecked=0, Total=1406 [2019-02-18 09:58:45,533 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 26 states. [2019-02-18 09:58:45,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:45,632 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2019-02-18 09:58:45,638 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-02-18 09:58:45,638 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 36 [2019-02-18 09:58:45,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:45,639 INFO L225 Difference]: With dead ends: 42 [2019-02-18 09:58:45,639 INFO L226 Difference]: Without dead ends: 41 [2019-02-18 09:58:45,640 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=637, Invalid=769, Unknown=0, NotChecked=0, Total=1406 [2019-02-18 09:58:45,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-02-18 09:58:45,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2019-02-18 09:58:45,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-02-18 09:58:45,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2019-02-18 09:58:45,645 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 36 [2019-02-18 09:58:45,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:45,645 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2019-02-18 09:58:45,645 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-02-18 09:58:45,645 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2019-02-18 09:58:45,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-02-18 09:58:45,646 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:45,646 INFO L402 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1] [2019-02-18 09:58:45,647 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:45,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:45,647 INFO L82 PathProgramCache]: Analyzing trace with hash 233130016, now seen corresponding path program 12 times [2019-02-18 09:58:45,647 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:45,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:45,648 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:58:45,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:45,648 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:45,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:46,183 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:46,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:46,183 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:46,184 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:46,184 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:46,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:46,184 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:58:46,193 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:58:46,193 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:58:46,208 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:58:46,208 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:58:46,213 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:46,220 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:46,221 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:46,228 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:46,229 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:46,453 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:46,454 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:46,786 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:46,807 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:46,807 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 39 [2019-02-18 09:58:46,807 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:46,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-02-18 09:58:46,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-02-18 09:58:46,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=742, Invalid=898, Unknown=0, NotChecked=0, Total=1640 [2019-02-18 09:58:46,809 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 28 states. [2019-02-18 09:58:46,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:46,904 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2019-02-18 09:58:46,904 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-02-18 09:58:46,905 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 39 [2019-02-18 09:58:46,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:46,906 INFO L225 Difference]: With dead ends: 45 [2019-02-18 09:58:46,906 INFO L226 Difference]: Without dead ends: 44 [2019-02-18 09:58:46,908 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=742, Invalid=898, Unknown=0, NotChecked=0, Total=1640 [2019-02-18 09:58:46,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-02-18 09:58:46,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2019-02-18 09:58:46,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-02-18 09:58:46,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2019-02-18 09:58:46,913 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 39 [2019-02-18 09:58:46,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:46,914 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2019-02-18 09:58:46,914 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-02-18 09:58:46,914 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2019-02-18 09:58:46,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-02-18 09:58:46,915 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:46,916 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1] [2019-02-18 09:58:46,916 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:46,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:46,916 INFO L82 PathProgramCache]: Analyzing trace with hash 214230540, now seen corresponding path program 13 times [2019-02-18 09:58:46,916 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:46,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:46,917 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:58:46,918 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:46,918 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:46,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:47,157 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:47,157 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:47,157 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:47,157 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:47,158 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:47,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:47,158 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:58:47,168 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:58:47,168 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:58:47,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:47,186 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:47,206 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:47,207 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:47,236 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:47,236 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:47,468 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:47,468 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:48,124 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:48,143 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:48,143 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 42 [2019-02-18 09:58:48,143 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:48,143 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-02-18 09:58:48,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-02-18 09:58:48,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=855, Invalid=1037, Unknown=0, NotChecked=0, Total=1892 [2019-02-18 09:58:48,145 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 30 states. [2019-02-18 09:58:48,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:48,249 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2019-02-18 09:58:48,249 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-02-18 09:58:48,250 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 42 [2019-02-18 09:58:48,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:48,250 INFO L225 Difference]: With dead ends: 48 [2019-02-18 09:58:48,251 INFO L226 Difference]: Without dead ends: 47 [2019-02-18 09:58:48,254 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 756 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=855, Invalid=1037, Unknown=0, NotChecked=0, Total=1892 [2019-02-18 09:58:48,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-02-18 09:58:48,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2019-02-18 09:58:48,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-02-18 09:58:48,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2019-02-18 09:58:48,259 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 42 [2019-02-18 09:58:48,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:48,259 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2019-02-18 09:58:48,259 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-02-18 09:58:48,259 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2019-02-18 09:58:48,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-02-18 09:58:48,260 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:48,260 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1] [2019-02-18 09:58:48,260 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:48,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:48,261 INFO L82 PathProgramCache]: Analyzing trace with hash -179343200, now seen corresponding path program 14 times [2019-02-18 09:58:48,261 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:48,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:48,262 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:58:48,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:48,262 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:48,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:48,608 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:48,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:48,608 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:48,609 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:48,609 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:48,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:48,609 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 09:58:48,621 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:58:48,622 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:58:48,702 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2019-02-18 09:58:48,703 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:58:48,706 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:48,710 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:48,711 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:48,722 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:48,722 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:49,086 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:49,087 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:49,408 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:49,427 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:49,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 45 [2019-02-18 09:58:49,428 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:49,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-02-18 09:58:49,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-02-18 09:58:49,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=976, Invalid=1186, Unknown=0, NotChecked=0, Total=2162 [2019-02-18 09:58:49,430 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 32 states. [2019-02-18 09:58:49,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:49,653 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2019-02-18 09:58:49,654 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-02-18 09:58:49,654 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 45 [2019-02-18 09:58:49,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:49,655 INFO L225 Difference]: With dead ends: 51 [2019-02-18 09:58:49,655 INFO L226 Difference]: Without dead ends: 50 [2019-02-18 09:58:49,659 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 870 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=976, Invalid=1186, Unknown=0, NotChecked=0, Total=2162 [2019-02-18 09:58:49,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-02-18 09:58:49,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2019-02-18 09:58:49,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-02-18 09:58:49,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2019-02-18 09:58:49,667 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 45 [2019-02-18 09:58:49,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:49,668 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2019-02-18 09:58:49,669 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-02-18 09:58:49,669 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2019-02-18 09:58:49,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-02-18 09:58:49,670 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:49,670 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1] [2019-02-18 09:58:49,670 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:49,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:49,670 INFO L82 PathProgramCache]: Analyzing trace with hash 126086540, now seen corresponding path program 15 times [2019-02-18 09:58:49,670 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:49,671 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:49,671 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:58:49,671 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:49,672 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:49,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:50,144 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:50,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:50,145 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:50,145 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:50,145 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:50,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:50,145 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:58:50,154 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:58:50,154 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:58:50,171 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:58:50,171 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:58:50,175 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:50,182 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:50,182 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:50,194 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:50,194 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:50,539 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:50,539 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:50,904 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:50,923 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:50,923 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 48 [2019-02-18 09:58:50,923 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:50,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-02-18 09:58:50,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-02-18 09:58:50,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1105, Invalid=1345, Unknown=0, NotChecked=0, Total=2450 [2019-02-18 09:58:50,925 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 34 states. [2019-02-18 09:58:51,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:51,053 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2019-02-18 09:58:51,053 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-02-18 09:58:51,053 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 48 [2019-02-18 09:58:51,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:51,054 INFO L225 Difference]: With dead ends: 54 [2019-02-18 09:58:51,054 INFO L226 Difference]: Without dead ends: 53 [2019-02-18 09:58:51,056 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1105, Invalid=1345, Unknown=0, NotChecked=0, Total=2450 [2019-02-18 09:58:51,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-02-18 09:58:51,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2019-02-18 09:58:51,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-02-18 09:58:51,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2019-02-18 09:58:51,061 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 48 [2019-02-18 09:58:51,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:51,061 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2019-02-18 09:58:51,062 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-02-18 09:58:51,062 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2019-02-18 09:58:51,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-02-18 09:58:51,063 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:51,063 INFO L402 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1] [2019-02-18 09:58:51,063 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:51,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:51,063 INFO L82 PathProgramCache]: Analyzing trace with hash -1852229344, now seen corresponding path program 16 times [2019-02-18 09:58:51,063 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:51,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:51,064 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:58:51,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:51,065 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:51,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:52,024 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:52,025 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:52,025 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:52,025 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:52,025 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:52,025 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:52,025 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 09:58:52,035 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:58:52,035 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:58:52,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:52,053 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:52,071 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:52,072 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:52,076 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:52,076 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:53,857 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:53,857 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:54,237 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:54,256 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:54,256 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 51 [2019-02-18 09:58:54,256 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:54,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-02-18 09:58:54,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-02-18 09:58:54,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1242, Invalid=1514, Unknown=0, NotChecked=0, Total=2756 [2019-02-18 09:58:54,258 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 36 states. [2019-02-18 09:58:54,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:54,393 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2019-02-18 09:58:54,393 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-02-18 09:58:54,394 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 51 [2019-02-18 09:58:54,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:54,394 INFO L225 Difference]: With dead ends: 57 [2019-02-18 09:58:54,395 INFO L226 Difference]: Without dead ends: 56 [2019-02-18 09:58:54,396 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1122 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1242, Invalid=1514, Unknown=0, NotChecked=0, Total=2756 [2019-02-18 09:58:54,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-02-18 09:58:54,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2019-02-18 09:58:54,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-02-18 09:58:54,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2019-02-18 09:58:54,402 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 51 [2019-02-18 09:58:54,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:54,403 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2019-02-18 09:58:54,403 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-02-18 09:58:54,403 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2019-02-18 09:58:54,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-02-18 09:58:54,404 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:54,404 INFO L402 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1] [2019-02-18 09:58:54,404 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:54,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:54,405 INFO L82 PathProgramCache]: Analyzing trace with hash 1975473420, now seen corresponding path program 17 times [2019-02-18 09:58:54,405 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:54,405 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:54,406 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:58:54,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:54,406 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:54,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:54,664 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:54,665 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:54,665 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:54,665 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:54,665 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:54,665 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:54,665 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:58:54,674 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:58:54,674 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:58:54,712 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2019-02-18 09:58:54,712 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:58:54,715 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:54,719 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:54,719 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:54,727 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:54,727 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:55,058 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:55,059 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:55,753 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:55,772 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:55,773 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 54 [2019-02-18 09:58:55,773 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:55,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-02-18 09:58:55,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-02-18 09:58:55,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1387, Invalid=1693, Unknown=0, NotChecked=0, Total=3080 [2019-02-18 09:58:55,775 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 38 states. [2019-02-18 09:58:55,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:55,899 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2019-02-18 09:58:55,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-02-18 09:58:55,900 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 54 [2019-02-18 09:58:55,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:55,901 INFO L225 Difference]: With dead ends: 60 [2019-02-18 09:58:55,901 INFO L226 Difference]: Without dead ends: 59 [2019-02-18 09:58:55,903 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1260 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1387, Invalid=1693, Unknown=0, NotChecked=0, Total=3080 [2019-02-18 09:58:55,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-02-18 09:58:55,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2019-02-18 09:58:55,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-02-18 09:58:55,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2019-02-18 09:58:55,907 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 54 [2019-02-18 09:58:55,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:55,908 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2019-02-18 09:58:55,908 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-02-18 09:58:55,908 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2019-02-18 09:58:55,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-02-18 09:58:55,909 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:55,909 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1] [2019-02-18 09:58:55,909 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:55,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:55,909 INFO L82 PathProgramCache]: Analyzing trace with hash 1686806944, now seen corresponding path program 18 times [2019-02-18 09:58:55,909 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:55,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:55,910 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:58:55,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:55,911 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:55,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:56,708 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:56,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:56,709 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:56,709 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:56,709 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:56,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:56,709 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:58:56,719 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:58:56,719 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:58:56,739 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:58:56,739 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:58:56,742 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:56,766 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:56,766 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:56,776 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:56,777 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:57,317 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:57,317 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:57,795 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:57,815 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:57,815 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 57 [2019-02-18 09:58:57,816 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:57,816 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-02-18 09:58:57,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-02-18 09:58:57,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1882, Unknown=0, NotChecked=0, Total=3422 [2019-02-18 09:58:57,818 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 40 states. [2019-02-18 09:58:57,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:57,942 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2019-02-18 09:58:57,942 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-02-18 09:58:57,942 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 57 [2019-02-18 09:58:57,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:57,943 INFO L225 Difference]: With dead ends: 63 [2019-02-18 09:58:57,944 INFO L226 Difference]: Without dead ends: 62 [2019-02-18 09:58:57,945 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1406 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1540, Invalid=1882, Unknown=0, NotChecked=0, Total=3422 [2019-02-18 09:58:57,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-02-18 09:58:57,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2019-02-18 09:58:57,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-02-18 09:58:57,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2019-02-18 09:58:57,950 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 57 [2019-02-18 09:58:57,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:57,950 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2019-02-18 09:58:57,950 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2019-02-18 09:58:57,950 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2019-02-18 09:58:57,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-02-18 09:58:57,951 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:57,951 INFO L402 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1] [2019-02-18 09:58:57,952 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:57,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:57,952 INFO L82 PathProgramCache]: Analyzing trace with hash 548347020, now seen corresponding path program 19 times [2019-02-18 09:58:57,952 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:57,953 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:57,953 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:58:57,953 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:57,953 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:57,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:58,283 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:58,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:58,284 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:58,284 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:58,284 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:58,284 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:58,284 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:58:58,294 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:58:58,295 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:58:58,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:58,321 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:58,325 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:58,326 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:58,337 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:58,338 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:58:58,690 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:58,690 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:58:59,225 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:59,246 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:58:59,246 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 60 [2019-02-18 09:58:59,247 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:58:59,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2019-02-18 09:58:59,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2019-02-18 09:58:59,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1701, Invalid=2081, Unknown=0, NotChecked=0, Total=3782 [2019-02-18 09:58:59,249 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 42 states. [2019-02-18 09:58:59,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:58:59,386 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2019-02-18 09:58:59,386 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-02-18 09:58:59,387 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 60 [2019-02-18 09:58:59,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:58:59,388 INFO L225 Difference]: With dead ends: 66 [2019-02-18 09:58:59,388 INFO L226 Difference]: Without dead ends: 65 [2019-02-18 09:58:59,390 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1560 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1701, Invalid=2081, Unknown=0, NotChecked=0, Total=3782 [2019-02-18 09:58:59,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2019-02-18 09:58:59,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2019-02-18 09:58:59,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-02-18 09:58:59,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2019-02-18 09:58:59,395 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 60 [2019-02-18 09:58:59,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:58:59,395 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2019-02-18 09:58:59,395 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2019-02-18 09:58:59,395 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2019-02-18 09:58:59,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-02-18 09:58:59,396 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:58:59,396 INFO L402 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1] [2019-02-18 09:58:59,396 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:58:59,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:58:59,397 INFO L82 PathProgramCache]: Analyzing trace with hash 2045487648, now seen corresponding path program 20 times [2019-02-18 09:58:59,397 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:58:59,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:59,398 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:58:59,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:58:59,398 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:58:59,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:58:59,705 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:58:59,705 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:59,705 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:58:59,705 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:58:59,705 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:58:59,705 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:58:59,705 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:58:59,717 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:58:59,717 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:58:59,759 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2019-02-18 09:58:59,759 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:58:59,762 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:58:59,766 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:58:59,766 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:58:59,785 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:58:59,786 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:00,194 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:00,195 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:01,237 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:01,256 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:01,256 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 63 [2019-02-18 09:59:01,256 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:01,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-02-18 09:59:01,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-02-18 09:59:01,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1870, Invalid=2290, Unknown=0, NotChecked=0, Total=4160 [2019-02-18 09:59:01,258 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand 44 states. [2019-02-18 09:59:01,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:01,439 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2019-02-18 09:59:01,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-02-18 09:59:01,439 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 63 [2019-02-18 09:59:01,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:01,440 INFO L225 Difference]: With dead ends: 69 [2019-02-18 09:59:01,441 INFO L226 Difference]: Without dead ends: 68 [2019-02-18 09:59:01,443 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1722 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1870, Invalid=2290, Unknown=0, NotChecked=0, Total=4160 [2019-02-18 09:59:01,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-02-18 09:59:01,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2019-02-18 09:59:01,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-02-18 09:59:01,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2019-02-18 09:59:01,447 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 63 [2019-02-18 09:59:01,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:01,448 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2019-02-18 09:59:01,448 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-02-18 09:59:01,448 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2019-02-18 09:59:01,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2019-02-18 09:59:01,449 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:01,449 INFO L402 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1] [2019-02-18 09:59:01,449 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:01,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:01,450 INFO L82 PathProgramCache]: Analyzing trace with hash 126567436, now seen corresponding path program 21 times [2019-02-18 09:59:01,450 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:01,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:01,451 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:59:01,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:01,451 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:01,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:02,003 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:02,003 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:02,003 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:02,004 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:02,004 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:02,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:02,004 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:59:02,012 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:59:02,013 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:59:02,034 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:59:02,034 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:59:02,038 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:02,040 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:02,041 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:02,051 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:02,051 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:02,547 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:02,548 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:03,225 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:03,244 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:03,244 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 66 [2019-02-18 09:59:03,245 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:03,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2019-02-18 09:59:03,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2019-02-18 09:59:03,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2047, Invalid=2509, Unknown=0, NotChecked=0, Total=4556 [2019-02-18 09:59:03,246 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 46 states. [2019-02-18 09:59:03,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:03,387 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2019-02-18 09:59:03,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-02-18 09:59:03,390 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 66 [2019-02-18 09:59:03,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:03,390 INFO L225 Difference]: With dead ends: 72 [2019-02-18 09:59:03,390 INFO L226 Difference]: Without dead ends: 71 [2019-02-18 09:59:03,391 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1892 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2047, Invalid=2509, Unknown=0, NotChecked=0, Total=4556 [2019-02-18 09:59:03,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2019-02-18 09:59:03,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2019-02-18 09:59:03,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-02-18 09:59:03,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2019-02-18 09:59:03,394 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 66 [2019-02-18 09:59:03,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:03,394 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2019-02-18 09:59:03,394 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2019-02-18 09:59:03,394 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2019-02-18 09:59:03,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-02-18 09:59:03,395 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:03,395 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1] [2019-02-18 09:59:03,395 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:03,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:03,395 INFO L82 PathProgramCache]: Analyzing trace with hash -410758496, now seen corresponding path program 22 times [2019-02-18 09:59:03,395 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:03,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:03,396 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:59:03,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:03,396 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:03,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:03,765 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:03,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:03,765 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:03,766 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:03,766 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:03,766 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:03,766 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:59:03,775 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:59:03,775 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:59:03,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:03,809 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:03,816 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:03,816 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:03,824 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:03,824 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:04,195 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:04,196 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:04,933 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:04,952 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:04,952 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 69 [2019-02-18 09:59:04,952 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:04,953 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2019-02-18 09:59:04,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2019-02-18 09:59:04,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2232, Invalid=2738, Unknown=0, NotChecked=0, Total=4970 [2019-02-18 09:59:04,954 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 48 states. [2019-02-18 09:59:05,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:05,127 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2019-02-18 09:59:05,127 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-02-18 09:59:05,127 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 69 [2019-02-18 09:59:05,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:05,128 INFO L225 Difference]: With dead ends: 75 [2019-02-18 09:59:05,128 INFO L226 Difference]: Without dead ends: 74 [2019-02-18 09:59:05,130 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2070 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2232, Invalid=2738, Unknown=0, NotChecked=0, Total=4970 [2019-02-18 09:59:05,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-02-18 09:59:05,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2019-02-18 09:59:05,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-02-18 09:59:05,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2019-02-18 09:59:05,134 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 69 [2019-02-18 09:59:05,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:05,134 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2019-02-18 09:59:05,135 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2019-02-18 09:59:05,135 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2019-02-18 09:59:05,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-02-18 09:59:05,135 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:05,135 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1] [2019-02-18 09:59:05,136 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:05,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:05,136 INFO L82 PathProgramCache]: Analyzing trace with hash -544486516, now seen corresponding path program 23 times [2019-02-18 09:59:05,136 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:05,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:05,137 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:59:05,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:05,137 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:05,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:05,843 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:05,844 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:05,844 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:05,844 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:05,844 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:05,844 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:05,844 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:59:05,853 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:59:05,853 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:59:05,900 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2019-02-18 09:59:05,901 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:59:05,903 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:05,906 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:05,906 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:05,932 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:05,933 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:06,342 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:06,343 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:07,148 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:07,168 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:07,168 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 72 [2019-02-18 09:59:07,168 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:07,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2019-02-18 09:59:07,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2019-02-18 09:59:07,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2019-02-18 09:59:07,170 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 50 states. [2019-02-18 09:59:07,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:07,354 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2019-02-18 09:59:07,354 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-02-18 09:59:07,354 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 72 [2019-02-18 09:59:07,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:07,355 INFO L225 Difference]: With dead ends: 78 [2019-02-18 09:59:07,355 INFO L226 Difference]: Without dead ends: 77 [2019-02-18 09:59:07,357 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2256 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2019-02-18 09:59:07,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2019-02-18 09:59:07,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2019-02-18 09:59:07,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-02-18 09:59:07,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2019-02-18 09:59:07,361 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 72 [2019-02-18 09:59:07,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:07,362 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2019-02-18 09:59:07,362 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2019-02-18 09:59:07,362 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2019-02-18 09:59:07,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-02-18 09:59:07,362 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:07,363 INFO L402 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1] [2019-02-18 09:59:07,363 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:07,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:07,363 INFO L82 PathProgramCache]: Analyzing trace with hash 1293720352, now seen corresponding path program 24 times [2019-02-18 09:59:07,363 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:07,364 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:07,364 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:59:07,364 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:07,365 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:07,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:07,794 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:07,795 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:07,795 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:07,795 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:07,795 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:07,795 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:07,795 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:59:07,805 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:59:07,806 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:59:07,833 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:59:07,833 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:59:07,836 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:07,840 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:07,841 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:07,855 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:07,855 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:08,291 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:08,291 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:09,347 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:09,365 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:09,366 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 75 [2019-02-18 09:59:09,366 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:09,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2019-02-18 09:59:09,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2019-02-18 09:59:09,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=3226, Unknown=0, NotChecked=0, Total=5852 [2019-02-18 09:59:09,368 INFO L87 Difference]: Start difference. First operand 76 states and 76 transitions. Second operand 52 states. [2019-02-18 09:59:09,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:09,559 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2019-02-18 09:59:09,559 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-02-18 09:59:09,559 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 75 [2019-02-18 09:59:09,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:09,560 INFO L225 Difference]: With dead ends: 81 [2019-02-18 09:59:09,561 INFO L226 Difference]: Without dead ends: 80 [2019-02-18 09:59:09,562 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2450 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2626, Invalid=3226, Unknown=0, NotChecked=0, Total=5852 [2019-02-18 09:59:09,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2019-02-18 09:59:09,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2019-02-18 09:59:09,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2019-02-18 09:59:09,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2019-02-18 09:59:09,566 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 75 [2019-02-18 09:59:09,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:09,566 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2019-02-18 09:59:09,567 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2019-02-18 09:59:09,567 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2019-02-18 09:59:09,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-02-18 09:59:09,567 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:09,567 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1] [2019-02-18 09:59:09,568 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:09,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:09,568 INFO L82 PathProgramCache]: Analyzing trace with hash -1813466356, now seen corresponding path program 25 times [2019-02-18 09:59:09,568 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:09,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:09,569 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:59:09,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:09,569 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:09,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:10,072 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:10,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:10,073 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:10,073 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:10,073 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:10,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:10,073 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:59:10,082 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:59:10,082 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:59:10,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:10,110 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:10,116 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:10,116 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:10,125 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:10,125 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:10,778 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:10,779 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:11,761 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:11,779 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:11,780 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 78 [2019-02-18 09:59:11,780 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:11,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2019-02-18 09:59:11,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2019-02-18 09:59:11,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2835, Invalid=3485, Unknown=0, NotChecked=0, Total=6320 [2019-02-18 09:59:11,782 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 54 states. [2019-02-18 09:59:11,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:11,986 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2019-02-18 09:59:11,986 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-02-18 09:59:11,986 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 78 [2019-02-18 09:59:11,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:11,987 INFO L225 Difference]: With dead ends: 84 [2019-02-18 09:59:11,987 INFO L226 Difference]: Without dead ends: 83 [2019-02-18 09:59:11,988 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2652 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2835, Invalid=3485, Unknown=0, NotChecked=0, Total=6320 [2019-02-18 09:59:11,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2019-02-18 09:59:11,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2019-02-18 09:59:11,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-02-18 09:59:11,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 82 transitions. [2019-02-18 09:59:11,992 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 82 transitions. Word has length 78 [2019-02-18 09:59:11,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:11,992 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 82 transitions. [2019-02-18 09:59:11,992 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2019-02-18 09:59:11,992 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 82 transitions. [2019-02-18 09:59:11,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2019-02-18 09:59:11,993 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:11,993 INFO L402 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1] [2019-02-18 09:59:11,993 INFO L423 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:11,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:11,994 INFO L82 PathProgramCache]: Analyzing trace with hash 1417446304, now seen corresponding path program 26 times [2019-02-18 09:59:11,994 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:11,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:11,995 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:59:11,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:11,995 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:12,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:12,516 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:12,517 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:12,517 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:12,517 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:12,517 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:12,517 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:12,517 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 09:59:12,527 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:59:12,527 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:59:12,583 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2019-02-18 09:59:12,583 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:59:12,586 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:12,590 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:12,590 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:12,603 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:12,603 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:13,115 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:13,115 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:14,097 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:14,116 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:14,117 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 81 [2019-02-18 09:59:14,117 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:14,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2019-02-18 09:59:14,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2019-02-18 09:59:14,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3052, Invalid=3754, Unknown=0, NotChecked=0, Total=6806 [2019-02-18 09:59:14,119 INFO L87 Difference]: Start difference. First operand 82 states and 82 transitions. Second operand 56 states. [2019-02-18 09:59:14,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:14,283 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2019-02-18 09:59:14,283 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-02-18 09:59:14,283 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 81 [2019-02-18 09:59:14,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:14,284 INFO L225 Difference]: With dead ends: 87 [2019-02-18 09:59:14,285 INFO L226 Difference]: Without dead ends: 86 [2019-02-18 09:59:14,286 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2862 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=3052, Invalid=3754, Unknown=0, NotChecked=0, Total=6806 [2019-02-18 09:59:14,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2019-02-18 09:59:14,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2019-02-18 09:59:14,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2019-02-18 09:59:14,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2019-02-18 09:59:14,290 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 81 [2019-02-18 09:59:14,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:14,290 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2019-02-18 09:59:14,290 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2019-02-18 09:59:14,290 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2019-02-18 09:59:14,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-02-18 09:59:14,291 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:14,291 INFO L402 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1] [2019-02-18 09:59:14,292 INFO L423 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:14,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:14,292 INFO L82 PathProgramCache]: Analyzing trace with hash -975570292, now seen corresponding path program 27 times [2019-02-18 09:59:14,292 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:14,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:14,293 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:59:14,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:14,293 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:14,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:14,986 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:14,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:14,987 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:14,987 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:14,987 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:14,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:14,987 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:59:14,999 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:59:14,999 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:59:15,026 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:59:15,026 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:59:15,030 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:15,033 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:15,034 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:15,043 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:15,043 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:15,900 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:15,900 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:16,943 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:16,969 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:16,969 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 84 [2019-02-18 09:59:16,969 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:16,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2019-02-18 09:59:16,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2019-02-18 09:59:16,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3277, Invalid=4033, Unknown=0, NotChecked=0, Total=7310 [2019-02-18 09:59:16,971 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 58 states. [2019-02-18 09:59:17,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:17,176 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2019-02-18 09:59:17,177 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-02-18 09:59:17,177 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 84 [2019-02-18 09:59:17,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:17,178 INFO L225 Difference]: With dead ends: 90 [2019-02-18 09:59:17,178 INFO L226 Difference]: Without dead ends: 89 [2019-02-18 09:59:17,179 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3080 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3277, Invalid=4033, Unknown=0, NotChecked=0, Total=7310 [2019-02-18 09:59:17,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-02-18 09:59:17,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2019-02-18 09:59:17,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-02-18 09:59:17,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 88 transitions. [2019-02-18 09:59:17,183 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 88 transitions. Word has length 84 [2019-02-18 09:59:17,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:17,183 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 88 transitions. [2019-02-18 09:59:17,183 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2019-02-18 09:59:17,183 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 88 transitions. [2019-02-18 09:59:17,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-02-18 09:59:17,184 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:17,184 INFO L402 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1] [2019-02-18 09:59:17,184 INFO L423 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:17,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:17,184 INFO L82 PathProgramCache]: Analyzing trace with hash 829164576, now seen corresponding path program 28 times [2019-02-18 09:59:17,185 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:17,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:17,185 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:59:17,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:17,186 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:17,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:17,690 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:17,690 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:17,690 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:17,691 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:17,691 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:17,691 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:17,691 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:59:17,700 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:59:17,700 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:59:17,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:17,730 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:17,746 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:17,746 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:17,773 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:17,774 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:18,680 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:18,681 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:19,785 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:19,804 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:19,804 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 87 [2019-02-18 09:59:19,804 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:19,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2019-02-18 09:59:19,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2019-02-18 09:59:19,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3510, Invalid=4322, Unknown=0, NotChecked=0, Total=7832 [2019-02-18 09:59:19,806 INFO L87 Difference]: Start difference. First operand 88 states and 88 transitions. Second operand 60 states. [2019-02-18 09:59:20,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:20,058 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2019-02-18 09:59:20,058 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-02-18 09:59:20,059 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 87 [2019-02-18 09:59:20,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:20,060 INFO L225 Difference]: With dead ends: 93 [2019-02-18 09:59:20,060 INFO L226 Difference]: Without dead ends: 92 [2019-02-18 09:59:20,065 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3306 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=3510, Invalid=4322, Unknown=0, NotChecked=0, Total=7832 [2019-02-18 09:59:20,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2019-02-18 09:59:20,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2019-02-18 09:59:20,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2019-02-18 09:59:20,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2019-02-18 09:59:20,069 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 87 [2019-02-18 09:59:20,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:20,069 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2019-02-18 09:59:20,069 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2019-02-18 09:59:20,069 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2019-02-18 09:59:20,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2019-02-18 09:59:20,070 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:20,070 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1] [2019-02-18 09:59:20,070 INFO L423 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:20,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:20,071 INFO L82 PathProgramCache]: Analyzing trace with hash 1285005836, now seen corresponding path program 29 times [2019-02-18 09:59:20,071 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:20,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:20,072 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:59:20,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:20,072 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:20,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:20,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:20,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:20,863 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:20,863 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:20,863 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:20,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:20,863 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:59:20,877 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:59:20,877 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:59:20,947 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2019-02-18 09:59:20,947 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:59:20,950 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:20,955 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:20,956 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:20,972 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:20,972 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:21,658 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:21,658 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:22,845 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:22,865 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:22,866 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 90 [2019-02-18 09:59:22,866 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:22,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2019-02-18 09:59:22,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2019-02-18 09:59:22,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3751, Invalid=4621, Unknown=0, NotChecked=0, Total=8372 [2019-02-18 09:59:22,868 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 62 states. [2019-02-18 09:59:23,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:23,060 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2019-02-18 09:59:23,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-02-18 09:59:23,060 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 90 [2019-02-18 09:59:23,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:23,061 INFO L225 Difference]: With dead ends: 96 [2019-02-18 09:59:23,061 INFO L226 Difference]: Without dead ends: 95 [2019-02-18 09:59:23,063 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3540 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3751, Invalid=4621, Unknown=0, NotChecked=0, Total=8372 [2019-02-18 09:59:23,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2019-02-18 09:59:23,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2019-02-18 09:59:23,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2019-02-18 09:59:23,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 94 transitions. [2019-02-18 09:59:23,067 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 94 transitions. Word has length 90 [2019-02-18 09:59:23,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:23,068 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 94 transitions. [2019-02-18 09:59:23,068 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2019-02-18 09:59:23,068 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 94 transitions. [2019-02-18 09:59:23,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-02-18 09:59:23,068 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:23,069 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1] [2019-02-18 09:59:23,069 INFO L423 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:23,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:23,069 INFO L82 PathProgramCache]: Analyzing trace with hash 565392544, now seen corresponding path program 30 times [2019-02-18 09:59:23,069 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:23,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:23,070 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:59:23,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:23,070 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:23,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:23,723 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:23,723 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:23,723 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:23,723 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:23,724 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:23,724 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:23,724 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:59:23,734 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:59:23,734 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:59:23,766 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:59:23,767 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:59:23,770 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:23,773 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:23,773 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:23,785 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:23,786 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:24,452 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:24,452 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:25,724 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:25,743 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:25,743 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 93 [2019-02-18 09:59:25,743 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:25,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2019-02-18 09:59:25,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2019-02-18 09:59:25,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4000, Invalid=4930, Unknown=0, NotChecked=0, Total=8930 [2019-02-18 09:59:25,745 INFO L87 Difference]: Start difference. First operand 94 states and 94 transitions. Second operand 64 states. [2019-02-18 09:59:25,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:25,980 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2019-02-18 09:59:25,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-02-18 09:59:25,981 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 93 [2019-02-18 09:59:25,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:25,982 INFO L225 Difference]: With dead ends: 99 [2019-02-18 09:59:25,982 INFO L226 Difference]: Without dead ends: 98 [2019-02-18 09:59:25,984 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3782 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=4000, Invalid=4930, Unknown=0, NotChecked=0, Total=8930 [2019-02-18 09:59:25,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2019-02-18 09:59:25,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2019-02-18 09:59:25,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2019-02-18 09:59:25,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2019-02-18 09:59:25,988 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 93 [2019-02-18 09:59:25,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:25,988 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2019-02-18 09:59:25,988 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2019-02-18 09:59:25,988 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2019-02-18 09:59:25,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2019-02-18 09:59:25,988 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:25,989 INFO L402 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1] [2019-02-18 09:59:25,989 INFO L423 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:25,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:25,989 INFO L82 PathProgramCache]: Analyzing trace with hash -1252415092, now seen corresponding path program 31 times [2019-02-18 09:59:25,989 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:25,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:25,990 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:59:25,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:25,990 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:26,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:26,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:26,637 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:26,638 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:26,638 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:26,638 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:26,638 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:26,638 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 09:59:26,647 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:59:26,647 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:59:26,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:26,680 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:26,697 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:26,698 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:26,716 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:26,716 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:27,443 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:27,443 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:28,745 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:28,764 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:28,764 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 96 [2019-02-18 09:59:28,764 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:28,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2019-02-18 09:59:28,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2019-02-18 09:59:28,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4257, Invalid=5249, Unknown=0, NotChecked=0, Total=9506 [2019-02-18 09:59:28,766 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 66 states. [2019-02-18 09:59:28,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:28,995 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2019-02-18 09:59:28,995 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-02-18 09:59:28,995 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 96 [2019-02-18 09:59:28,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:28,997 INFO L225 Difference]: With dead ends: 102 [2019-02-18 09:59:28,997 INFO L226 Difference]: Without dead ends: 101 [2019-02-18 09:59:28,998 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4032 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=4257, Invalid=5249, Unknown=0, NotChecked=0, Total=9506 [2019-02-18 09:59:28,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2019-02-18 09:59:29,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2019-02-18 09:59:29,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-02-18 09:59:29,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 100 transitions. [2019-02-18 09:59:29,002 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 100 transitions. Word has length 96 [2019-02-18 09:59:29,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:29,003 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 100 transitions. [2019-02-18 09:59:29,003 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2019-02-18 09:59:29,003 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 100 transitions. [2019-02-18 09:59:29,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2019-02-18 09:59:29,004 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:29,004 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1] [2019-02-18 09:59:29,004 INFO L423 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:29,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:29,004 INFO L82 PathProgramCache]: Analyzing trace with hash -317063904, now seen corresponding path program 32 times [2019-02-18 09:59:29,005 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:29,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:29,005 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:59:29,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:29,006 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:29,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:29,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:29,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:29,699 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:29,699 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:29,699 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:29,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:29,699 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:59:29,707 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:59:29,707 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:59:29,787 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2019-02-18 09:59:29,787 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:59:29,791 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:29,818 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:29,819 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:29,901 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:29,902 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:30,639 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:30,639 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:32,573 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:32,591 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:32,591 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 99 [2019-02-18 09:59:32,591 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:32,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2019-02-18 09:59:32,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2019-02-18 09:59:32,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4522, Invalid=5578, Unknown=0, NotChecked=0, Total=10100 [2019-02-18 09:59:32,593 INFO L87 Difference]: Start difference. First operand 100 states and 100 transitions. Second operand 68 states. [2019-02-18 09:59:32,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:32,847 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2019-02-18 09:59:32,847 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-02-18 09:59:32,847 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 99 [2019-02-18 09:59:32,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:32,848 INFO L225 Difference]: With dead ends: 105 [2019-02-18 09:59:32,849 INFO L226 Difference]: Without dead ends: 104 [2019-02-18 09:59:32,849 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4290 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4522, Invalid=5578, Unknown=0, NotChecked=0, Total=10100 [2019-02-18 09:59:32,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2019-02-18 09:59:32,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2019-02-18 09:59:32,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2019-02-18 09:59:32,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2019-02-18 09:59:32,854 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 99 [2019-02-18 09:59:32,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:32,854 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2019-02-18 09:59:32,854 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2019-02-18 09:59:32,854 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2019-02-18 09:59:32,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2019-02-18 09:59:32,855 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:32,855 INFO L402 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1] [2019-02-18 09:59:32,855 INFO L423 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:32,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:32,855 INFO L82 PathProgramCache]: Analyzing trace with hash -1017638644, now seen corresponding path program 33 times [2019-02-18 09:59:32,856 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:32,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:32,856 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:59:32,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:32,857 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:32,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:33,786 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:33,787 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:33,787 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:33,787 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:33,787 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:33,787 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:33,787 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:59:33,804 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:59:33,804 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:59:33,837 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:59:33,837 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:59:33,840 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:33,843 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:33,843 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:33,854 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:33,854 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:34,669 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:34,669 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:36,354 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:36,373 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:36,374 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 102 [2019-02-18 09:59:36,374 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:36,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2019-02-18 09:59:36,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2019-02-18 09:59:36,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4795, Invalid=5917, Unknown=0, NotChecked=0, Total=10712 [2019-02-18 09:59:36,375 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 70 states. [2019-02-18 09:59:36,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:36,670 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2019-02-18 09:59:36,671 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-02-18 09:59:36,671 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 102 [2019-02-18 09:59:36,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:36,673 INFO L225 Difference]: With dead ends: 108 [2019-02-18 09:59:36,673 INFO L226 Difference]: Without dead ends: 107 [2019-02-18 09:59:36,674 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4556 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4795, Invalid=5917, Unknown=0, NotChecked=0, Total=10712 [2019-02-18 09:59:36,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2019-02-18 09:59:36,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2019-02-18 09:59:36,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2019-02-18 09:59:36,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 106 transitions. [2019-02-18 09:59:36,678 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 106 transitions. Word has length 102 [2019-02-18 09:59:36,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:36,678 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 106 transitions. [2019-02-18 09:59:36,678 INFO L481 AbstractCegarLoop]: Interpolant automaton has 70 states. [2019-02-18 09:59:36,678 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 106 transitions. [2019-02-18 09:59:36,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2019-02-18 09:59:36,679 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:36,679 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1] [2019-02-18 09:59:36,679 INFO L423 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:36,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:36,679 INFO L82 PathProgramCache]: Analyzing trace with hash 1701340576, now seen corresponding path program 34 times [2019-02-18 09:59:36,679 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:36,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:36,680 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:59:36,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:36,680 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:36,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:37,463 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:37,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:37,463 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:37,463 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:37,463 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:37,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:37,464 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 09:59:37,472 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:59:37,472 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:59:37,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:37,505 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:37,509 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:37,509 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:37,517 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:37,517 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:38,345 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:38,345 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:39,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:39,972 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:39,972 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 105 [2019-02-18 09:59:39,972 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:39,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 72 states [2019-02-18 09:59:39,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2019-02-18 09:59:39,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5076, Invalid=6266, Unknown=0, NotChecked=0, Total=11342 [2019-02-18 09:59:39,974 INFO L87 Difference]: Start difference. First operand 106 states and 106 transitions. Second operand 72 states. [2019-02-18 09:59:40,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:40,175 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2019-02-18 09:59:40,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-02-18 09:59:40,175 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 105 [2019-02-18 09:59:40,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:40,177 INFO L225 Difference]: With dead ends: 111 [2019-02-18 09:59:40,177 INFO L226 Difference]: Without dead ends: 110 [2019-02-18 09:59:40,178 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4830 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=5076, Invalid=6266, Unknown=0, NotChecked=0, Total=11342 [2019-02-18 09:59:40,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2019-02-18 09:59:40,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2019-02-18 09:59:40,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2019-02-18 09:59:40,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2019-02-18 09:59:40,182 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 105 [2019-02-18 09:59:40,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:40,182 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2019-02-18 09:59:40,182 INFO L481 AbstractCegarLoop]: Interpolant automaton has 72 states. [2019-02-18 09:59:40,182 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2019-02-18 09:59:40,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2019-02-18 09:59:40,183 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:40,183 INFO L402 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1] [2019-02-18 09:59:40,183 INFO L423 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:40,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:40,183 INFO L82 PathProgramCache]: Analyzing trace with hash -271918964, now seen corresponding path program 35 times [2019-02-18 09:59:40,183 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:40,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:40,184 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:59:40,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:40,184 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:40,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:41,861 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:41,861 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:41,862 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:41,862 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:41,862 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:41,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:41,862 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:59:41,871 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:59:41,872 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:59:41,964 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2019-02-18 09:59:41,964 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:59:41,969 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:41,973 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:41,973 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:41,980 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:41,980 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:42,884 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:42,884 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:44,553 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:44,573 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:44,573 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 108 [2019-02-18 09:59:44,573 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:44,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2019-02-18 09:59:44,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2019-02-18 09:59:44,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5365, Invalid=6625, Unknown=0, NotChecked=0, Total=11990 [2019-02-18 09:59:44,576 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 74 states. [2019-02-18 09:59:44,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:44,913 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2019-02-18 09:59:44,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-02-18 09:59:44,913 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 108 [2019-02-18 09:59:44,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:44,914 INFO L225 Difference]: With dead ends: 114 [2019-02-18 09:59:44,915 INFO L226 Difference]: Without dead ends: 113 [2019-02-18 09:59:44,916 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5112 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=5365, Invalid=6625, Unknown=0, NotChecked=0, Total=11990 [2019-02-18 09:59:44,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2019-02-18 09:59:44,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 112. [2019-02-18 09:59:44,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2019-02-18 09:59:44,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 112 transitions. [2019-02-18 09:59:44,921 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 112 transitions. Word has length 108 [2019-02-18 09:59:44,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:44,921 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 112 transitions. [2019-02-18 09:59:44,921 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2019-02-18 09:59:44,921 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 112 transitions. [2019-02-18 09:59:44,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2019-02-18 09:59:44,922 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:44,922 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1] [2019-02-18 09:59:44,922 INFO L423 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:44,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:44,923 INFO L82 PathProgramCache]: Analyzing trace with hash -429494752, now seen corresponding path program 36 times [2019-02-18 09:59:44,923 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:44,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:44,924 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:59:44,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:44,924 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:44,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:45,710 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:45,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:45,711 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:45,711 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:45,711 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:45,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:45,711 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:59:45,720 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:59:45,720 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:59:45,759 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:59:45,759 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:59:45,763 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:45,767 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:45,768 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:45,780 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:45,781 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:46,967 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:46,968 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:48,776 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:48,795 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:48,796 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 111 [2019-02-18 09:59:48,796 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:48,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 76 states [2019-02-18 09:59:48,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2019-02-18 09:59:48,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5662, Invalid=6994, Unknown=0, NotChecked=0, Total=12656 [2019-02-18 09:59:48,798 INFO L87 Difference]: Start difference. First operand 112 states and 112 transitions. Second operand 76 states. [2019-02-18 09:59:49,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:49,047 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2019-02-18 09:59:49,047 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-02-18 09:59:49,048 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 111 [2019-02-18 09:59:49,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:49,049 INFO L225 Difference]: With dead ends: 117 [2019-02-18 09:59:49,049 INFO L226 Difference]: Without dead ends: 116 [2019-02-18 09:59:49,050 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5402 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=5662, Invalid=6994, Unknown=0, NotChecked=0, Total=12656 [2019-02-18 09:59:49,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2019-02-18 09:59:49,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2019-02-18 09:59:49,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2019-02-18 09:59:49,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2019-02-18 09:59:49,053 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 111 [2019-02-18 09:59:49,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:49,053 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2019-02-18 09:59:49,053 INFO L481 AbstractCegarLoop]: Interpolant automaton has 76 states. [2019-02-18 09:59:49,053 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2019-02-18 09:59:49,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2019-02-18 09:59:49,054 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:49,054 INFO L402 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1] [2019-02-18 09:59:49,055 INFO L423 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:49,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:49,055 INFO L82 PathProgramCache]: Analyzing trace with hash -370540532, now seen corresponding path program 37 times [2019-02-18 09:59:49,055 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:49,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:49,056 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:59:49,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:49,056 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:49,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:49,942 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:49,942 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:49,942 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:49,943 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:49,943 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:49,943 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:49,943 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:59:49,952 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:59:49,952 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:59:49,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:49,999 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:50,004 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:50,005 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:50,017 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:50,018 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:51,051 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:51,052 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:53,166 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:53,187 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:53,187 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 114 [2019-02-18 09:59:53,187 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:53,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 78 states [2019-02-18 09:59:53,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2019-02-18 09:59:53,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5967, Invalid=7373, Unknown=0, NotChecked=0, Total=13340 [2019-02-18 09:59:53,189 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 78 states. [2019-02-18 09:59:53,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:53,507 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2019-02-18 09:59:53,507 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2019-02-18 09:59:53,507 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 114 [2019-02-18 09:59:53,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:53,509 INFO L225 Difference]: With dead ends: 120 [2019-02-18 09:59:53,509 INFO L226 Difference]: Without dead ends: 119 [2019-02-18 09:59:53,510 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5700 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=5967, Invalid=7373, Unknown=0, NotChecked=0, Total=13340 [2019-02-18 09:59:53,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2019-02-18 09:59:53,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2019-02-18 09:59:53,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2019-02-18 09:59:53,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 118 transitions. [2019-02-18 09:59:53,514 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 118 transitions. Word has length 114 [2019-02-18 09:59:53,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:53,514 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 118 transitions. [2019-02-18 09:59:53,514 INFO L481 AbstractCegarLoop]: Interpolant automaton has 78 states. [2019-02-18 09:59:53,514 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 118 transitions. [2019-02-18 09:59:53,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2019-02-18 09:59:53,514 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:53,515 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1] [2019-02-18 09:59:53,515 INFO L423 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:53,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:53,515 INFO L82 PathProgramCache]: Analyzing trace with hash -706996576, now seen corresponding path program 38 times [2019-02-18 09:59:53,515 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:53,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:53,516 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:59:53,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:53,516 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:53,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:59:55,438 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:55,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:55,439 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:59:55,439 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:59:55,439 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:59:55,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:59:55,439 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:59:55,449 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:59:55,449 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:59:55,553 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2019-02-18 09:59:55,554 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:59:55,558 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:59:55,560 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 09:59:55,561 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:59:55,572 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:59:55,572 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:59:56,810 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:56,810 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:59:58,955 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:59:58,976 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:59:58,976 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 117 [2019-02-18 09:59:58,976 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:59:58,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2019-02-18 09:59:58,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2019-02-18 09:59:58,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6280, Invalid=7762, Unknown=0, NotChecked=0, Total=14042 [2019-02-18 09:59:58,979 INFO L87 Difference]: Start difference. First operand 118 states and 118 transitions. Second operand 80 states. [2019-02-18 09:59:59,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:59:59,342 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2019-02-18 09:59:59,342 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2019-02-18 09:59:59,343 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 117 [2019-02-18 09:59:59,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:59:59,344 INFO L225 Difference]: With dead ends: 123 [2019-02-18 09:59:59,344 INFO L226 Difference]: Without dead ends: 122 [2019-02-18 09:59:59,346 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6006 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=6280, Invalid=7762, Unknown=0, NotChecked=0, Total=14042 [2019-02-18 09:59:59,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2019-02-18 09:59:59,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2019-02-18 09:59:59,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2019-02-18 09:59:59,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2019-02-18 09:59:59,349 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 117 [2019-02-18 09:59:59,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:59:59,349 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2019-02-18 09:59:59,349 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2019-02-18 09:59:59,350 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2019-02-18 09:59:59,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2019-02-18 09:59:59,350 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:59:59,350 INFO L402 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1] [2019-02-18 09:59:59,350 INFO L423 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:59:59,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:59:59,351 INFO L82 PathProgramCache]: Analyzing trace with hash 384665484, now seen corresponding path program 39 times [2019-02-18 09:59:59,351 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:59:59,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:59,352 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:59:59,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:59:59,352 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:59:59,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:00:00,213 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:00,213 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:00,213 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:00:00,213 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:00:00,214 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:00:00,214 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:00,214 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:00:00,224 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:00:00,224 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:00:00,266 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:00:00,267 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:00:00,273 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:00:00,291 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:00:00,292 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:00:00,387 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:00:00,387 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:00:02,871 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:02,871 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:00:05,010 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:05,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:00:05,040 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 120 [2019-02-18 10:00:05,040 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:00:05,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 82 states [2019-02-18 10:00:05,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2019-02-18 10:00:05,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6601, Invalid=8161, Unknown=0, NotChecked=0, Total=14762 [2019-02-18 10:00:05,043 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 82 states. [2019-02-18 10:00:05,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:00:05,357 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2019-02-18 10:00:05,357 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-02-18 10:00:05,357 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 120 [2019-02-18 10:00:05,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:00:05,359 INFO L225 Difference]: With dead ends: 126 [2019-02-18 10:00:05,359 INFO L226 Difference]: Without dead ends: 125 [2019-02-18 10:00:05,360 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6320 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=6601, Invalid=8161, Unknown=0, NotChecked=0, Total=14762 [2019-02-18 10:00:05,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2019-02-18 10:00:05,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2019-02-18 10:00:05,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2019-02-18 10:00:05,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2019-02-18 10:00:05,364 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 120 [2019-02-18 10:00:05,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:00:05,364 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2019-02-18 10:00:05,364 INFO L481 AbstractCegarLoop]: Interpolant automaton has 82 states. [2019-02-18 10:00:05,364 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2019-02-18 10:00:05,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2019-02-18 10:00:05,364 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:00:05,365 INFO L402 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1] [2019-02-18 10:00:05,365 INFO L423 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:00:05,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:00:05,365 INFO L82 PathProgramCache]: Analyzing trace with hash 596729632, now seen corresponding path program 40 times [2019-02-18 10:00:05,365 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:00:05,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:05,366 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:00:05,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:05,366 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:00:05,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:00:07,621 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:07,621 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:07,621 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:00:07,621 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:00:07,621 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:00:07,621 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:07,621 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:00:07,631 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:00:07,631 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:00:07,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:00:07,676 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:00:07,679 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:00:07,679 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:00:07,689 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:00:07,690 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:00:08,734 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:08,735 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:00:10,876 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:10,905 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:00:10,905 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 123 [2019-02-18 10:00:10,905 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:00:10,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 84 states [2019-02-18 10:00:10,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2019-02-18 10:00:10,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6930, Invalid=8570, Unknown=0, NotChecked=0, Total=15500 [2019-02-18 10:00:10,908 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 84 states. [2019-02-18 10:00:11,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:00:11,278 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2019-02-18 10:00:11,279 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2019-02-18 10:00:11,279 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 123 [2019-02-18 10:00:11,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:00:11,283 INFO L225 Difference]: With dead ends: 129 [2019-02-18 10:00:11,283 INFO L226 Difference]: Without dead ends: 128 [2019-02-18 10:00:11,285 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6642 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=6930, Invalid=8570, Unknown=0, NotChecked=0, Total=15500 [2019-02-18 10:00:11,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2019-02-18 10:00:11,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2019-02-18 10:00:11,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2019-02-18 10:00:11,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2019-02-18 10:00:11,289 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 123 [2019-02-18 10:00:11,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:00:11,290 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2019-02-18 10:00:11,290 INFO L481 AbstractCegarLoop]: Interpolant automaton has 84 states. [2019-02-18 10:00:11,290 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2019-02-18 10:00:11,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2019-02-18 10:00:11,291 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:00:11,291 INFO L402 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1] [2019-02-18 10:00:11,291 INFO L423 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:00:11,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:00:11,291 INFO L82 PathProgramCache]: Analyzing trace with hash 302870284, now seen corresponding path program 41 times [2019-02-18 10:00:11,292 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:00:11,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:11,292 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:00:11,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:11,292 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:00:11,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:00:12,832 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:12,833 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:12,833 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:00:12,833 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:00:12,833 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:00:12,833 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:12,833 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:00:12,843 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:00:12,843 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:00:12,967 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2019-02-18 10:00:12,968 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:00:12,972 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:00:12,990 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:00:12,991 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:00:13,003 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:00:13,003 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:00:14,125 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:14,125 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:00:16,338 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:16,357 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:00:16,357 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 126 [2019-02-18 10:00:16,357 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:00:16,358 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2019-02-18 10:00:16,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2019-02-18 10:00:16,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7267, Invalid=8989, Unknown=0, NotChecked=0, Total=16256 [2019-02-18 10:00:16,360 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand 86 states. [2019-02-18 10:00:16,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:00:16,697 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2019-02-18 10:00:16,697 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-02-18 10:00:16,697 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 126 [2019-02-18 10:00:16,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:00:16,699 INFO L225 Difference]: With dead ends: 132 [2019-02-18 10:00:16,699 INFO L226 Difference]: Without dead ends: 131 [2019-02-18 10:00:16,701 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6972 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=7267, Invalid=8989, Unknown=0, NotChecked=0, Total=16256 [2019-02-18 10:00:16,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2019-02-18 10:00:16,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 130. [2019-02-18 10:00:16,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2019-02-18 10:00:16,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 130 transitions. [2019-02-18 10:00:16,705 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 130 transitions. Word has length 126 [2019-02-18 10:00:16,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:00:16,706 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 130 transitions. [2019-02-18 10:00:16,706 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2019-02-18 10:00:16,706 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 130 transitions. [2019-02-18 10:00:16,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2019-02-18 10:00:16,706 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:00:16,707 INFO L402 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1] [2019-02-18 10:00:16,707 INFO L423 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:00:16,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:00:16,707 INFO L82 PathProgramCache]: Analyzing trace with hash -917616736, now seen corresponding path program 42 times [2019-02-18 10:00:16,707 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:00:16,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:16,708 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:00:16,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:16,708 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:00:16,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:00:18,124 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:18,124 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:18,124 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:00:18,124 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:00:18,124 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:00:18,124 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:18,124 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:00:18,134 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:00:18,134 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:00:18,176 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:00:18,177 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:00:18,181 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:00:18,188 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:00:18,188 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:00:18,199 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:00:18,199 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:00:19,390 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:19,390 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:00:21,779 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:21,798 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:00:21,798 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 129 [2019-02-18 10:00:21,798 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:00:21,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 88 states [2019-02-18 10:00:21,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2019-02-18 10:00:21,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7612, Invalid=9418, Unknown=0, NotChecked=0, Total=17030 [2019-02-18 10:00:21,802 INFO L87 Difference]: Start difference. First operand 130 states and 130 transitions. Second operand 88 states. [2019-02-18 10:00:22,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:00:22,402 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2019-02-18 10:00:22,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2019-02-18 10:00:22,402 INFO L78 Accepts]: Start accepts. Automaton has 88 states. Word has length 129 [2019-02-18 10:00:22,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:00:22,404 INFO L225 Difference]: With dead ends: 135 [2019-02-18 10:00:22,404 INFO L226 Difference]: Without dead ends: 134 [2019-02-18 10:00:22,406 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7310 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=7612, Invalid=9418, Unknown=0, NotChecked=0, Total=17030 [2019-02-18 10:00:22,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2019-02-18 10:00:22,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2019-02-18 10:00:22,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2019-02-18 10:00:22,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2019-02-18 10:00:22,412 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 129 [2019-02-18 10:00:22,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:00:22,413 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2019-02-18 10:00:22,413 INFO L481 AbstractCegarLoop]: Interpolant automaton has 88 states. [2019-02-18 10:00:22,413 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2019-02-18 10:00:22,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2019-02-18 10:00:22,414 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:00:22,415 INFO L402 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1] [2019-02-18 10:00:22,415 INFO L423 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:00:22,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:00:22,415 INFO L82 PathProgramCache]: Analyzing trace with hash 746698380, now seen corresponding path program 43 times [2019-02-18 10:00:22,415 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:00:22,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:22,416 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:00:22,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:22,417 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:00:22,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:00:24,228 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:24,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:24,229 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:00:24,229 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:00:24,229 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:00:24,229 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:24,229 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:00:24,238 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:00:24,238 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:00:24,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:00:24,280 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:00:24,284 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:00:24,285 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:00:24,294 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:00:24,295 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:00:25,468 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:25,468 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:00:28,223 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:28,242 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:00:28,243 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 132 [2019-02-18 10:00:28,243 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:00:28,243 INFO L459 AbstractCegarLoop]: Interpolant automaton has 90 states [2019-02-18 10:00:28,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2019-02-18 10:00:28,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7965, Invalid=9857, Unknown=0, NotChecked=0, Total=17822 [2019-02-18 10:00:28,245 INFO L87 Difference]: Start difference. First operand 133 states and 133 transitions. Second operand 90 states. [2019-02-18 10:00:28,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:00:28,509 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2019-02-18 10:00:28,509 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-02-18 10:00:28,509 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 132 [2019-02-18 10:00:28,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:00:28,511 INFO L225 Difference]: With dead ends: 138 [2019-02-18 10:00:28,511 INFO L226 Difference]: Without dead ends: 137 [2019-02-18 10:00:28,512 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7656 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=7965, Invalid=9857, Unknown=0, NotChecked=0, Total=17822 [2019-02-18 10:00:28,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2019-02-18 10:00:28,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2019-02-18 10:00:28,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2019-02-18 10:00:28,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 136 transitions. [2019-02-18 10:00:28,517 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 136 transitions. Word has length 132 [2019-02-18 10:00:28,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:00:28,518 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 136 transitions. [2019-02-18 10:00:28,518 INFO L481 AbstractCegarLoop]: Interpolant automaton has 90 states. [2019-02-18 10:00:28,518 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 136 transitions. [2019-02-18 10:00:28,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2019-02-18 10:00:28,518 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:00:28,518 INFO L402 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1] [2019-02-18 10:00:28,519 INFO L423 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:00:28,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:00:28,519 INFO L82 PathProgramCache]: Analyzing trace with hash 1255854112, now seen corresponding path program 44 times [2019-02-18 10:00:28,519 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:00:28,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:28,520 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:00:28,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:28,520 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:00:28,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:00:29,616 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:29,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:29,616 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:00:29,616 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:00:29,616 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:00:29,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:29,616 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:00:29,625 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:00:29,626 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:00:29,750 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2019-02-18 10:00:29,751 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:00:29,755 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:00:29,758 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:00:29,758 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:00:29,774 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:00:29,774 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:00:31,024 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:31,024 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:00:33,905 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:33,925 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:00:33,925 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 135 [2019-02-18 10:00:33,925 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:00:33,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2019-02-18 10:00:33,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2019-02-18 10:00:33,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8326, Invalid=10306, Unknown=0, NotChecked=0, Total=18632 [2019-02-18 10:00:33,928 INFO L87 Difference]: Start difference. First operand 136 states and 136 transitions. Second operand 92 states. [2019-02-18 10:00:34,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:00:34,213 INFO L93 Difference]: Finished difference Result 141 states and 141 transitions. [2019-02-18 10:00:34,214 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-02-18 10:00:34,214 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 135 [2019-02-18 10:00:34,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:00:34,216 INFO L225 Difference]: With dead ends: 141 [2019-02-18 10:00:34,216 INFO L226 Difference]: Without dead ends: 140 [2019-02-18 10:00:34,217 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8010 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=8326, Invalid=10306, Unknown=0, NotChecked=0, Total=18632 [2019-02-18 10:00:34,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2019-02-18 10:00:34,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2019-02-18 10:00:34,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2019-02-18 10:00:34,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 139 transitions. [2019-02-18 10:00:34,222 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 139 transitions. Word has length 135 [2019-02-18 10:00:34,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:00:34,222 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 139 transitions. [2019-02-18 10:00:34,222 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2019-02-18 10:00:34,222 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 139 transitions. [2019-02-18 10:00:34,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2019-02-18 10:00:34,223 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:00:34,223 INFO L402 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1] [2019-02-18 10:00:34,223 INFO L423 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:00:34,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:00:34,224 INFO L82 PathProgramCache]: Analyzing trace with hash -310223348, now seen corresponding path program 45 times [2019-02-18 10:00:34,224 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:00:34,225 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:34,225 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:00:34,225 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:34,225 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:00:34,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:00:36,917 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:36,918 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:36,918 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:00:36,918 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:00:36,918 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:00:36,918 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:36,918 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:00:36,928 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:00:36,928 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:00:36,972 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:00:36,972 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:00:36,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:00:36,994 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:00:36,995 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:00:37,014 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:00:37,015 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:00:38,593 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:38,593 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:00:41,399 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:41,418 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:00:41,418 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 138 [2019-02-18 10:00:41,418 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:00:41,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 94 states [2019-02-18 10:00:41,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2019-02-18 10:00:41,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8695, Invalid=10765, Unknown=0, NotChecked=0, Total=19460 [2019-02-18 10:00:41,421 INFO L87 Difference]: Start difference. First operand 139 states and 139 transitions. Second operand 94 states. [2019-02-18 10:00:41,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:00:41,814 INFO L93 Difference]: Finished difference Result 144 states and 144 transitions. [2019-02-18 10:00:41,814 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2019-02-18 10:00:41,814 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 138 [2019-02-18 10:00:41,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:00:41,816 INFO L225 Difference]: With dead ends: 144 [2019-02-18 10:00:41,816 INFO L226 Difference]: Without dead ends: 143 [2019-02-18 10:00:41,817 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8372 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=8695, Invalid=10765, Unknown=0, NotChecked=0, Total=19460 [2019-02-18 10:00:41,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2019-02-18 10:00:41,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 142. [2019-02-18 10:00:41,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2019-02-18 10:00:41,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 142 transitions. [2019-02-18 10:00:41,823 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 142 transitions. Word has length 138 [2019-02-18 10:00:41,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:00:41,823 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 142 transitions. [2019-02-18 10:00:41,823 INFO L481 AbstractCegarLoop]: Interpolant automaton has 94 states. [2019-02-18 10:00:41,824 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 142 transitions. [2019-02-18 10:00:41,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2019-02-18 10:00:41,824 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:00:41,824 INFO L402 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1] [2019-02-18 10:00:41,825 INFO L423 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:00:41,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:00:41,825 INFO L82 PathProgramCache]: Analyzing trace with hash 905902240, now seen corresponding path program 46 times [2019-02-18 10:00:41,825 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:00:41,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:41,826 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:00:41,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:41,826 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:00:41,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:00:43,483 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:43,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:43,483 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:00:43,483 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:00:43,483 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:00:43,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:43,484 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:00:43,493 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:00:43,493 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:00:43,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:00:43,539 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:00:43,547 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:00:43,547 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:00:43,557 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:00:43,557 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:00:44,904 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:44,905 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:00:48,240 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:48,260 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:00:48,260 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 141 [2019-02-18 10:00:48,260 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:00:48,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2019-02-18 10:00:48,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2019-02-18 10:00:48,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9072, Invalid=11234, Unknown=0, NotChecked=0, Total=20306 [2019-02-18 10:00:48,263 INFO L87 Difference]: Start difference. First operand 142 states and 142 transitions. Second operand 96 states. [2019-02-18 10:00:48,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:00:48,593 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2019-02-18 10:00:48,593 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2019-02-18 10:00:48,594 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 141 [2019-02-18 10:00:48,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:00:48,595 INFO L225 Difference]: With dead ends: 147 [2019-02-18 10:00:48,595 INFO L226 Difference]: Without dead ends: 146 [2019-02-18 10:00:48,597 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8742 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=9072, Invalid=11234, Unknown=0, NotChecked=0, Total=20306 [2019-02-18 10:00:48,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2019-02-18 10:00:48,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2019-02-18 10:00:48,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2019-02-18 10:00:48,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 145 transitions. [2019-02-18 10:00:48,602 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 145 transitions. Word has length 141 [2019-02-18 10:00:48,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:00:48,602 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 145 transitions. [2019-02-18 10:00:48,602 INFO L481 AbstractCegarLoop]: Interpolant automaton has 96 states. [2019-02-18 10:00:48,603 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 145 transitions. [2019-02-18 10:00:48,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2019-02-18 10:00:48,603 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:00:48,604 INFO L402 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1] [2019-02-18 10:00:48,604 INFO L423 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:00:48,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:00:48,604 INFO L82 PathProgramCache]: Analyzing trace with hash -1840814708, now seen corresponding path program 47 times [2019-02-18 10:00:48,604 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:00:48,605 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:48,605 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:00:48,605 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:48,605 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:00:48,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:00:49,984 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:49,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:49,985 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:00:49,985 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:00:49,985 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:00:49,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:49,985 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:00:49,994 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:00:49,994 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:00:50,135 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2019-02-18 10:00:50,136 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:00:50,141 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:00:50,157 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:00:50,157 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:00:50,246 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:00:50,247 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:00:51,638 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:51,638 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:00:54,931 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:54,951 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:00:54,951 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 144 [2019-02-18 10:00:54,951 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:00:54,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2019-02-18 10:00:54,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2019-02-18 10:00:54,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9457, Invalid=11713, Unknown=0, NotChecked=0, Total=21170 [2019-02-18 10:00:54,953 INFO L87 Difference]: Start difference. First operand 145 states and 145 transitions. Second operand 98 states. [2019-02-18 10:00:55,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:00:55,309 INFO L93 Difference]: Finished difference Result 150 states and 150 transitions. [2019-02-18 10:00:55,310 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2019-02-18 10:00:55,310 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 144 [2019-02-18 10:00:55,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:00:55,311 INFO L225 Difference]: With dead ends: 150 [2019-02-18 10:00:55,311 INFO L226 Difference]: Without dead ends: 149 [2019-02-18 10:00:55,313 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9120 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=9457, Invalid=11713, Unknown=0, NotChecked=0, Total=21170 [2019-02-18 10:00:55,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2019-02-18 10:00:55,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 148. [2019-02-18 10:00:55,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2019-02-18 10:00:55,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 148 transitions. [2019-02-18 10:00:55,317 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 148 transitions. Word has length 144 [2019-02-18 10:00:55,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:00:55,318 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 148 transitions. [2019-02-18 10:00:55,318 INFO L481 AbstractCegarLoop]: Interpolant automaton has 98 states. [2019-02-18 10:00:55,318 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 148 transitions. [2019-02-18 10:00:55,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2019-02-18 10:00:55,318 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:00:55,319 INFO L402 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1] [2019-02-18 10:00:55,319 INFO L423 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:00:55,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:00:55,319 INFO L82 PathProgramCache]: Analyzing trace with hash -1568489184, now seen corresponding path program 48 times [2019-02-18 10:00:55,319 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:00:55,319 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:55,320 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:00:55,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:00:55,320 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:00:55,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:00:57,085 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:57,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:57,086 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:00:57,086 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:00:57,086 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:00:57,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:00:57,086 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:00:57,094 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:00:57,094 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:00:57,140 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:00:57,141 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:00:57,146 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:00:57,149 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:00:57,149 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:00:57,159 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:00:57,159 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:00:58,963 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:00:58,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:01:02,018 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:02,039 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:01:02,040 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 147 [2019-02-18 10:01:02,040 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:01:02,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 100 states [2019-02-18 10:01:02,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2019-02-18 10:01:02,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9850, Invalid=12202, Unknown=0, NotChecked=0, Total=22052 [2019-02-18 10:01:02,042 INFO L87 Difference]: Start difference. First operand 148 states and 148 transitions. Second operand 100 states. [2019-02-18 10:01:02,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:01:02,509 INFO L93 Difference]: Finished difference Result 153 states and 153 transitions. [2019-02-18 10:01:02,510 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2019-02-18 10:01:02,510 INFO L78 Accepts]: Start accepts. Automaton has 100 states. Word has length 147 [2019-02-18 10:01:02,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:01:02,511 INFO L225 Difference]: With dead ends: 153 [2019-02-18 10:01:02,511 INFO L226 Difference]: Without dead ends: 152 [2019-02-18 10:01:02,513 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9506 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=9850, Invalid=12202, Unknown=0, NotChecked=0, Total=22052 [2019-02-18 10:01:02,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2019-02-18 10:01:02,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 151. [2019-02-18 10:01:02,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2019-02-18 10:01:02,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 151 transitions. [2019-02-18 10:01:02,519 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 151 transitions. Word has length 147 [2019-02-18 10:01:02,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:01:02,519 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 151 transitions. [2019-02-18 10:01:02,519 INFO L481 AbstractCegarLoop]: Interpolant automaton has 100 states. [2019-02-18 10:01:02,519 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 151 transitions. [2019-02-18 10:01:02,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2019-02-18 10:01:02,520 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:01:02,520 INFO L402 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1] [2019-02-18 10:01:02,520 INFO L423 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:01:02,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:01:02,521 INFO L82 PathProgramCache]: Analyzing trace with hash -1912025844, now seen corresponding path program 49 times [2019-02-18 10:01:02,521 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:01:02,521 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:01:02,521 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:01:02,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:01:02,522 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:01:02,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:01:04,060 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:04,060 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:01:04,061 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:01:04,061 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:01:04,061 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:01:04,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:01:04,061 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:01:04,071 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:01:04,071 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:01:04,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:01:04,120 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:01:04,123 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:01:04,124 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:01:04,137 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:01:04,137 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:01:05,640 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:05,641 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:01:09,118 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:09,137 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:01:09,137 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 150 [2019-02-18 10:01:09,137 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:01:09,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2019-02-18 10:01:09,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2019-02-18 10:01:09,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10251, Invalid=12701, Unknown=0, NotChecked=0, Total=22952 [2019-02-18 10:01:09,141 INFO L87 Difference]: Start difference. First operand 151 states and 151 transitions. Second operand 102 states. [2019-02-18 10:01:09,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:01:09,502 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2019-02-18 10:01:09,502 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2019-02-18 10:01:09,503 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 150 [2019-02-18 10:01:09,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:01:09,504 INFO L225 Difference]: With dead ends: 156 [2019-02-18 10:01:09,504 INFO L226 Difference]: Without dead ends: 155 [2019-02-18 10:01:09,505 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9900 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=10251, Invalid=12701, Unknown=0, NotChecked=0, Total=22952 [2019-02-18 10:01:09,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2019-02-18 10:01:09,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2019-02-18 10:01:09,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2019-02-18 10:01:09,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 154 transitions. [2019-02-18 10:01:09,510 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 154 transitions. Word has length 150 [2019-02-18 10:01:09,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:01:09,511 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 154 transitions. [2019-02-18 10:01:09,511 INFO L481 AbstractCegarLoop]: Interpolant automaton has 102 states. [2019-02-18 10:01:09,511 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 154 transitions. [2019-02-18 10:01:09,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2019-02-18 10:01:09,512 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:01:09,512 INFO L402 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1] [2019-02-18 10:01:09,512 INFO L423 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:01:09,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:01:09,513 INFO L82 PathProgramCache]: Analyzing trace with hash -1305597536, now seen corresponding path program 50 times [2019-02-18 10:01:09,513 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:01:09,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:01:09,514 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:01:09,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:01:09,514 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:01:09,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:01:10,898 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:10,898 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:01:10,898 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:01:10,898 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:01:10,898 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:01:10,899 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:01:10,899 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:01:10,909 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:01:10,909 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:01:11,067 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2019-02-18 10:01:11,067 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:01:11,073 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:01:11,079 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:01:11,080 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:01:11,091 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:01:11,091 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:01:12,686 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:12,686 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:01:16,071 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:16,091 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:01:16,091 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 151 [2019-02-18 10:01:16,091 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:01:16,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2019-02-18 10:01:16,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2019-02-18 10:01:16,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10353, Invalid=12903, Unknown=0, NotChecked=0, Total=23256 [2019-02-18 10:01:16,094 INFO L87 Difference]: Start difference. First operand 154 states and 154 transitions. Second operand 104 states. [2019-02-18 10:01:16,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:01:16,455 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2019-02-18 10:01:16,455 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2019-02-18 10:01:16,455 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 153 [2019-02-18 10:01:16,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:01:16,457 INFO L225 Difference]: With dead ends: 159 [2019-02-18 10:01:16,457 INFO L226 Difference]: Without dead ends: 158 [2019-02-18 10:01:16,459 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 202 SyntacticMatches, 2 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10397 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=10353, Invalid=12903, Unknown=0, NotChecked=0, Total=23256 [2019-02-18 10:01:16,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2019-02-18 10:01:16,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 157. [2019-02-18 10:01:16,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2019-02-18 10:01:16,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 157 transitions. [2019-02-18 10:01:16,463 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 157 transitions. Word has length 153 [2019-02-18 10:01:16,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:01:16,463 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 157 transitions. [2019-02-18 10:01:16,463 INFO L481 AbstractCegarLoop]: Interpolant automaton has 104 states. [2019-02-18 10:01:16,463 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 157 transitions. [2019-02-18 10:01:16,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2019-02-18 10:01:16,464 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:01:16,464 INFO L402 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1] [2019-02-18 10:01:16,465 INFO L423 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:01:16,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:01:16,465 INFO L82 PathProgramCache]: Analyzing trace with hash 167679116, now seen corresponding path program 51 times [2019-02-18 10:01:16,465 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:01:16,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:01:16,466 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:01:16,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:01:16,466 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:01:16,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:01:17,964 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:17,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:01:17,965 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:01:17,965 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:01:17,965 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:01:17,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:01:17,965 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:01:17,974 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:01:17,974 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:01:18,025 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:01:18,026 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:01:18,031 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:01:18,034 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:01:18,034 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:01:18,045 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:01:18,045 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:01:19,909 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:19,909 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:01:23,212 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:23,231 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:01:23,232 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 152 [2019-02-18 10:01:23,232 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:01:23,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 106 states [2019-02-18 10:01:23,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2019-02-18 10:01:23,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10455, Invalid=13107, Unknown=0, NotChecked=0, Total=23562 [2019-02-18 10:01:23,235 INFO L87 Difference]: Start difference. First operand 157 states and 157 transitions. Second operand 106 states. [2019-02-18 10:01:23,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:01:23,606 INFO L93 Difference]: Finished difference Result 162 states and 162 transitions. [2019-02-18 10:01:23,607 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2019-02-18 10:01:23,607 INFO L78 Accepts]: Start accepts. Automaton has 106 states. Word has length 156 [2019-02-18 10:01:23,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:01:23,608 INFO L225 Difference]: With dead ends: 162 [2019-02-18 10:01:23,609 INFO L226 Difference]: Without dead ends: 161 [2019-02-18 10:01:23,610 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 206 SyntacticMatches, 4 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10894 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=10455, Invalid=13107, Unknown=0, NotChecked=0, Total=23562 [2019-02-18 10:01:23,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2019-02-18 10:01:23,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 160. [2019-02-18 10:01:23,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2019-02-18 10:01:23,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 160 transitions. [2019-02-18 10:01:23,615 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 160 transitions. Word has length 156 [2019-02-18 10:01:23,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:01:23,616 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 160 transitions. [2019-02-18 10:01:23,616 INFO L481 AbstractCegarLoop]: Interpolant automaton has 106 states. [2019-02-18 10:01:23,616 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 160 transitions. [2019-02-18 10:01:23,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2019-02-18 10:01:23,617 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:01:23,618 INFO L402 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1] [2019-02-18 10:01:23,618 INFO L423 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:01:23,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:01:23,618 INFO L82 PathProgramCache]: Analyzing trace with hash 281621024, now seen corresponding path program 52 times [2019-02-18 10:01:23,618 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:01:23,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:01:23,619 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:01:23,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:01:23,620 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:01:23,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:01:25,147 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:25,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:01:25,148 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:01:25,148 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:01:25,148 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:01:25,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:01:25,148 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:01:25,158 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:01:25,158 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:01:25,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:01:25,208 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:01:25,211 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:01:25,211 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:01:25,222 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:01:25,222 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:01:26,975 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:26,975 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:01:30,641 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:30,661 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:01:30,662 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 153 [2019-02-18 10:01:30,662 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:01:30,662 INFO L459 AbstractCegarLoop]: Interpolant automaton has 108 states [2019-02-18 10:01:30,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2019-02-18 10:01:30,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10557, Invalid=13313, Unknown=0, NotChecked=0, Total=23870 [2019-02-18 10:01:30,665 INFO L87 Difference]: Start difference. First operand 160 states and 160 transitions. Second operand 108 states. [2019-02-18 10:01:31,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:01:31,140 INFO L93 Difference]: Finished difference Result 165 states and 165 transitions. [2019-02-18 10:01:31,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2019-02-18 10:01:31,140 INFO L78 Accepts]: Start accepts. Automaton has 108 states. Word has length 159 [2019-02-18 10:01:31,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:01:31,141 INFO L225 Difference]: With dead ends: 165 [2019-02-18 10:01:31,141 INFO L226 Difference]: Without dead ends: 164 [2019-02-18 10:01:31,143 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 369 GetRequests, 210 SyntacticMatches, 6 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11391 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=10557, Invalid=13313, Unknown=0, NotChecked=0, Total=23870 [2019-02-18 10:01:31,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2019-02-18 10:01:31,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 163. [2019-02-18 10:01:31,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2019-02-18 10:01:31,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 163 transitions. [2019-02-18 10:01:31,147 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 163 transitions. Word has length 159 [2019-02-18 10:01:31,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:01:31,147 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 163 transitions. [2019-02-18 10:01:31,147 INFO L481 AbstractCegarLoop]: Interpolant automaton has 108 states. [2019-02-18 10:01:31,147 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 163 transitions. [2019-02-18 10:01:31,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2019-02-18 10:01:31,148 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:01:31,148 INFO L402 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1] [2019-02-18 10:01:31,148 INFO L423 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:01:31,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:01:31,148 INFO L82 PathProgramCache]: Analyzing trace with hash 1700838412, now seen corresponding path program 53 times [2019-02-18 10:01:31,149 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:01:31,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:01:31,149 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:01:31,150 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:01:31,150 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:01:31,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:01:32,731 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:32,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:01:32,731 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:01:32,732 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:01:32,732 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:01:32,732 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:01:32,732 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:01:32,741 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:01:32,741 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:01:32,936 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2019-02-18 10:01:32,937 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:01:32,944 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:01:32,947 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:01:32,947 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:01:32,955 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:01:32,955 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:01:35,853 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:35,854 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:01:39,692 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:39,711 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:01:39,712 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 154 [2019-02-18 10:01:39,712 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:01:39,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2019-02-18 10:01:39,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2019-02-18 10:01:39,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10659, Invalid=13521, Unknown=0, NotChecked=0, Total=24180 [2019-02-18 10:01:39,714 INFO L87 Difference]: Start difference. First operand 163 states and 163 transitions. Second operand 110 states. [2019-02-18 10:01:40,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:01:40,188 INFO L93 Difference]: Finished difference Result 168 states and 168 transitions. [2019-02-18 10:01:40,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2019-02-18 10:01:40,189 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 162 [2019-02-18 10:01:40,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:01:40,190 INFO L225 Difference]: With dead ends: 168 [2019-02-18 10:01:40,190 INFO L226 Difference]: Without dead ends: 167 [2019-02-18 10:01:40,191 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 214 SyntacticMatches, 8 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11888 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=10659, Invalid=13521, Unknown=0, NotChecked=0, Total=24180 [2019-02-18 10:01:40,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2019-02-18 10:01:40,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2019-02-18 10:01:40,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2019-02-18 10:01:40,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 166 transitions. [2019-02-18 10:01:40,195 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 166 transitions. Word has length 162 [2019-02-18 10:01:40,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:01:40,195 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 166 transitions. [2019-02-18 10:01:40,195 INFO L481 AbstractCegarLoop]: Interpolant automaton has 110 states. [2019-02-18 10:01:40,195 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 166 transitions. [2019-02-18 10:01:40,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2019-02-18 10:01:40,196 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:01:40,196 INFO L402 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1] [2019-02-18 10:01:40,196 INFO L423 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:01:40,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:01:40,196 INFO L82 PathProgramCache]: Analyzing trace with hash 1947982496, now seen corresponding path program 54 times [2019-02-18 10:01:40,196 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:01:40,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:01:40,197 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:01:40,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:01:40,197 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:01:40,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:01:41,820 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:41,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:01:41,821 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:01:41,821 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:01:41,821 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:01:41,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:01:41,821 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:01:41,843 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:01:41,843 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:01:41,900 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:01:41,900 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:01:41,906 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:01:41,922 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:01:41,923 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:01:42,018 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:01:42,018 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:01:43,844 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:43,844 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:01:47,583 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:47,603 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:01:47,603 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 155 [2019-02-18 10:01:47,603 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:01:47,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 112 states [2019-02-18 10:01:47,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2019-02-18 10:01:47,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10761, Invalid=13731, Unknown=0, NotChecked=0, Total=24492 [2019-02-18 10:01:47,606 INFO L87 Difference]: Start difference. First operand 166 states and 166 transitions. Second operand 112 states. [2019-02-18 10:01:48,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:01:48,038 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2019-02-18 10:01:48,038 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2019-02-18 10:01:48,038 INFO L78 Accepts]: Start accepts. Automaton has 112 states. Word has length 165 [2019-02-18 10:01:48,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:01:48,039 INFO L225 Difference]: With dead ends: 171 [2019-02-18 10:01:48,039 INFO L226 Difference]: Without dead ends: 170 [2019-02-18 10:01:48,040 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 218 SyntacticMatches, 10 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12385 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=10761, Invalid=13731, Unknown=0, NotChecked=0, Total=24492 [2019-02-18 10:01:48,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2019-02-18 10:01:48,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2019-02-18 10:01:48,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2019-02-18 10:01:48,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 169 transitions. [2019-02-18 10:01:48,044 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 169 transitions. Word has length 165 [2019-02-18 10:01:48,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:01:48,044 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 169 transitions. [2019-02-18 10:01:48,044 INFO L481 AbstractCegarLoop]: Interpolant automaton has 112 states. [2019-02-18 10:01:48,044 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 169 transitions. [2019-02-18 10:01:48,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2019-02-18 10:01:48,045 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:01:48,045 INFO L402 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1] [2019-02-18 10:01:48,046 INFO L423 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:01:48,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:01:48,046 INFO L82 PathProgramCache]: Analyzing trace with hash -1251523700, now seen corresponding path program 55 times [2019-02-18 10:01:48,046 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:01:48,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:01:48,047 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:01:48,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:01:48,047 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:01:48,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:01:49,901 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:49,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:01:49,902 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:01:49,902 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:01:49,902 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:01:49,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:01:49,902 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:01:49,913 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:01:49,913 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:01:49,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:01:49,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:01:49,980 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:01:49,980 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:01:49,988 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:01:49,989 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:01:51,880 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:51,881 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:01:55,730 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:55,749 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:01:55,749 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 156 [2019-02-18 10:01:55,750 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:01:55,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 114 states [2019-02-18 10:01:55,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2019-02-18 10:01:55,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10863, Invalid=13943, Unknown=0, NotChecked=0, Total=24806 [2019-02-18 10:01:55,752 INFO L87 Difference]: Start difference. First operand 169 states and 169 transitions. Second operand 114 states. [2019-02-18 10:01:56,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:01:56,185 INFO L93 Difference]: Finished difference Result 174 states and 174 transitions. [2019-02-18 10:01:56,185 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2019-02-18 10:01:56,185 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 168 [2019-02-18 10:01:56,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:01:56,187 INFO L225 Difference]: With dead ends: 174 [2019-02-18 10:01:56,187 INFO L226 Difference]: Without dead ends: 173 [2019-02-18 10:01:56,188 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 222 SyntacticMatches, 12 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12882 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=10863, Invalid=13943, Unknown=0, NotChecked=0, Total=24806 [2019-02-18 10:01:56,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2019-02-18 10:01:56,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 172. [2019-02-18 10:01:56,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2019-02-18 10:01:56,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 172 transitions. [2019-02-18 10:01:56,191 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 172 transitions. Word has length 168 [2019-02-18 10:01:56,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:01:56,192 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 172 transitions. [2019-02-18 10:01:56,192 INFO L481 AbstractCegarLoop]: Interpolant automaton has 114 states. [2019-02-18 10:01:56,192 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 172 transitions. [2019-02-18 10:01:56,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2019-02-18 10:01:56,192 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:01:56,192 INFO L402 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1] [2019-02-18 10:01:56,193 INFO L423 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:01:56,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:01:56,193 INFO L82 PathProgramCache]: Analyzing trace with hash 468591392, now seen corresponding path program 56 times [2019-02-18 10:01:56,193 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:01:56,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:01:56,194 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:01:56,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:01:56,194 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:01:56,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:01:57,853 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:01:57,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:01:57,854 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:01:57,854 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:01:57,854 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:01:57,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:01:57,854 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:01:57,863 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:01:57,864 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:01:58,108 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2019-02-18 10:01:58,108 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:01:58,114 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:01:58,117 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:01:58,117 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:01:58,128 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:01:58,129 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:02:00,325 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:00,326 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:02:04,068 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:04,088 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:02:04,089 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 157 [2019-02-18 10:02:04,089 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:02:04,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2019-02-18 10:02:04,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2019-02-18 10:02:04,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10965, Invalid=14157, Unknown=0, NotChecked=0, Total=25122 [2019-02-18 10:02:04,091 INFO L87 Difference]: Start difference. First operand 172 states and 172 transitions. Second operand 116 states. [2019-02-18 10:02:04,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:02:04,533 INFO L93 Difference]: Finished difference Result 177 states and 177 transitions. [2019-02-18 10:02:04,533 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2019-02-18 10:02:04,533 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 171 [2019-02-18 10:02:04,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:02:04,534 INFO L225 Difference]: With dead ends: 177 [2019-02-18 10:02:04,534 INFO L226 Difference]: Without dead ends: 176 [2019-02-18 10:02:04,536 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 226 SyntacticMatches, 14 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13379 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=10965, Invalid=14157, Unknown=0, NotChecked=0, Total=25122 [2019-02-18 10:02:04,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2019-02-18 10:02:04,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 175. [2019-02-18 10:02:04,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2019-02-18 10:02:04,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 175 transitions. [2019-02-18 10:02:04,540 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 175 transitions. Word has length 171 [2019-02-18 10:02:04,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:02:04,540 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 175 transitions. [2019-02-18 10:02:04,540 INFO L481 AbstractCegarLoop]: Interpolant automaton has 116 states. [2019-02-18 10:02:04,540 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 175 transitions. [2019-02-18 10:02:04,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2019-02-18 10:02:04,541 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:02:04,541 INFO L402 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1] [2019-02-18 10:02:04,542 INFO L423 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:02:04,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:02:04,542 INFO L82 PathProgramCache]: Analyzing trace with hash 1162488588, now seen corresponding path program 57 times [2019-02-18 10:02:04,542 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:02:04,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:02:04,543 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:02:04,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:02:04,543 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:02:04,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:02:06,444 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:06,445 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:02:06,445 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:02:06,445 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:02:06,445 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:02:06,445 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:02:06,445 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:02:06,453 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:02:06,454 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:02:06,515 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:02:06,516 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:02:06,523 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:02:06,526 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:02:06,526 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:02:06,536 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:02:06,536 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:02:08,586 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:08,587 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:02:12,412 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:12,432 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:02:12,433 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 158 [2019-02-18 10:02:12,433 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:02:12,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 118 states [2019-02-18 10:02:12,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2019-02-18 10:02:12,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11067, Invalid=14373, Unknown=0, NotChecked=0, Total=25440 [2019-02-18 10:02:12,437 INFO L87 Difference]: Start difference. First operand 175 states and 175 transitions. Second operand 118 states. [2019-02-18 10:02:12,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:02:12,931 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2019-02-18 10:02:12,932 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2019-02-18 10:02:12,932 INFO L78 Accepts]: Start accepts. Automaton has 118 states. Word has length 174 [2019-02-18 10:02:12,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:02:12,933 INFO L225 Difference]: With dead ends: 180 [2019-02-18 10:02:12,933 INFO L226 Difference]: Without dead ends: 179 [2019-02-18 10:02:12,935 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 230 SyntacticMatches, 16 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13876 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=11067, Invalid=14373, Unknown=0, NotChecked=0, Total=25440 [2019-02-18 10:02:12,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2019-02-18 10:02:12,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 178. [2019-02-18 10:02:12,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2019-02-18 10:02:12,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 178 transitions. [2019-02-18 10:02:12,939 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 178 transitions. Word has length 174 [2019-02-18 10:02:12,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:02:12,940 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 178 transitions. [2019-02-18 10:02:12,940 INFO L481 AbstractCegarLoop]: Interpolant automaton has 118 states. [2019-02-18 10:02:12,940 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 178 transitions. [2019-02-18 10:02:12,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2019-02-18 10:02:12,940 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:02:12,940 INFO L402 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1] [2019-02-18 10:02:12,941 INFO L423 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:02:12,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:02:12,941 INFO L82 PathProgramCache]: Analyzing trace with hash 1376258976, now seen corresponding path program 58 times [2019-02-18 10:02:12,941 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:02:12,941 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:02:12,942 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:02:12,942 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:02:12,942 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:02:12,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:02:14,735 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:14,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:02:14,736 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:02:14,736 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:02:14,736 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:02:14,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:02:14,736 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:02:14,746 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:02:14,746 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:02:14,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:02:14,806 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:02:14,809 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:02:14,809 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:02:14,820 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:02:14,820 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:02:17,181 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:17,181 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:02:21,149 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:21,168 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:02:21,168 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 159 [2019-02-18 10:02:21,169 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:02:21,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 120 states [2019-02-18 10:02:21,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2019-02-18 10:02:21,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11169, Invalid=14591, Unknown=0, NotChecked=0, Total=25760 [2019-02-18 10:02:21,171 INFO L87 Difference]: Start difference. First operand 178 states and 178 transitions. Second operand 120 states. [2019-02-18 10:02:21,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:02:21,652 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2019-02-18 10:02:21,652 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2019-02-18 10:02:21,652 INFO L78 Accepts]: Start accepts. Automaton has 120 states. Word has length 177 [2019-02-18 10:02:21,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:02:21,654 INFO L225 Difference]: With dead ends: 183 [2019-02-18 10:02:21,654 INFO L226 Difference]: Without dead ends: 182 [2019-02-18 10:02:21,655 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 234 SyntacticMatches, 18 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14373 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=11169, Invalid=14591, Unknown=0, NotChecked=0, Total=25760 [2019-02-18 10:02:21,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2019-02-18 10:02:21,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2019-02-18 10:02:21,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2019-02-18 10:02:21,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 181 transitions. [2019-02-18 10:02:21,660 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 181 transitions. Word has length 177 [2019-02-18 10:02:21,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:02:21,660 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 181 transitions. [2019-02-18 10:02:21,660 INFO L481 AbstractCegarLoop]: Interpolant automaton has 120 states. [2019-02-18 10:02:21,660 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 181 transitions. [2019-02-18 10:02:21,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2019-02-18 10:02:21,661 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:02:21,662 INFO L402 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1] [2019-02-18 10:02:21,662 INFO L423 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:02:21,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:02:21,662 INFO L82 PathProgramCache]: Analyzing trace with hash 373387916, now seen corresponding path program 59 times [2019-02-18 10:02:21,662 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:02:21,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:02:21,663 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:02:21,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:02:21,663 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:02:21,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:02:23,479 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:23,480 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:02:23,480 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:02:23,480 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:02:23,480 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:02:23,480 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:02:23,480 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:02:23,489 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:02:23,489 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:02:23,933 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2019-02-18 10:02:23,933 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:02:23,942 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:02:23,947 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:02:23,948 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:02:23,956 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:02:23,956 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:02:26,385 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:26,385 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:02:30,218 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:30,238 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:02:30,239 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 160 [2019-02-18 10:02:30,239 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:02:30,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2019-02-18 10:02:30,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2019-02-18 10:02:30,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11271, Invalid=14811, Unknown=0, NotChecked=0, Total=26082 [2019-02-18 10:02:30,241 INFO L87 Difference]: Start difference. First operand 181 states and 181 transitions. Second operand 122 states. [2019-02-18 10:02:30,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:02:30,759 INFO L93 Difference]: Finished difference Result 186 states and 186 transitions. [2019-02-18 10:02:30,760 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2019-02-18 10:02:30,760 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 180 [2019-02-18 10:02:30,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:02:30,761 INFO L225 Difference]: With dead ends: 186 [2019-02-18 10:02:30,761 INFO L226 Difference]: Without dead ends: 185 [2019-02-18 10:02:30,762 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 238 SyntacticMatches, 20 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14870 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=11271, Invalid=14811, Unknown=0, NotChecked=0, Total=26082 [2019-02-18 10:02:30,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2019-02-18 10:02:30,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2019-02-18 10:02:30,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2019-02-18 10:02:30,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 184 transitions. [2019-02-18 10:02:30,768 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 184 transitions. Word has length 180 [2019-02-18 10:02:30,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:02:30,768 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 184 transitions. [2019-02-18 10:02:30,768 INFO L481 AbstractCegarLoop]: Interpolant automaton has 122 states. [2019-02-18 10:02:30,768 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 184 transitions. [2019-02-18 10:02:30,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2019-02-18 10:02:30,769 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:02:30,770 INFO L402 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1] [2019-02-18 10:02:30,770 INFO L423 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:02:30,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:02:30,770 INFO L82 PathProgramCache]: Analyzing trace with hash -365849568, now seen corresponding path program 60 times [2019-02-18 10:02:30,770 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:02:30,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:02:30,771 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:02:30,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:02:30,771 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:02:30,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:02:32,636 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:32,636 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:02:32,636 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:02:32,636 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:02:32,637 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:02:32,637 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:02:32,637 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:02:32,646 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:02:32,647 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:02:32,712 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:02:32,712 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:02:32,720 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:02:32,736 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:02:32,737 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:02:32,773 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:02:32,773 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:02:34,989 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:34,990 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:02:39,045 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:39,065 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:02:39,065 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 161 [2019-02-18 10:02:39,065 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:02:39,066 INFO L459 AbstractCegarLoop]: Interpolant automaton has 124 states [2019-02-18 10:02:39,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2019-02-18 10:02:39,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11373, Invalid=15033, Unknown=0, NotChecked=0, Total=26406 [2019-02-18 10:02:39,067 INFO L87 Difference]: Start difference. First operand 184 states and 184 transitions. Second operand 124 states. [2019-02-18 10:02:39,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:02:39,576 INFO L93 Difference]: Finished difference Result 189 states and 189 transitions. [2019-02-18 10:02:39,576 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2019-02-18 10:02:39,576 INFO L78 Accepts]: Start accepts. Automaton has 124 states. Word has length 183 [2019-02-18 10:02:39,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:02:39,577 INFO L225 Difference]: With dead ends: 189 [2019-02-18 10:02:39,577 INFO L226 Difference]: Without dead ends: 188 [2019-02-18 10:02:39,578 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 242 SyntacticMatches, 22 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15367 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=11373, Invalid=15033, Unknown=0, NotChecked=0, Total=26406 [2019-02-18 10:02:39,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2019-02-18 10:02:39,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 187. [2019-02-18 10:02:39,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2019-02-18 10:02:39,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 187 transitions. [2019-02-18 10:02:39,583 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 187 transitions. Word has length 183 [2019-02-18 10:02:39,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:02:39,584 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 187 transitions. [2019-02-18 10:02:39,584 INFO L481 AbstractCegarLoop]: Interpolant automaton has 124 states. [2019-02-18 10:02:39,584 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 187 transitions. [2019-02-18 10:02:39,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2019-02-18 10:02:39,585 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:02:39,585 INFO L402 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1] [2019-02-18 10:02:39,585 INFO L423 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:02:39,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:02:39,585 INFO L82 PathProgramCache]: Analyzing trace with hash 1602558476, now seen corresponding path program 61 times [2019-02-18 10:02:39,585 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:02:39,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:02:39,586 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:02:39,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:02:39,586 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:02:39,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:02:41,725 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:41,725 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:02:41,725 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:02:41,726 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:02:41,726 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:02:41,726 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:02:41,726 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:02:41,735 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:02:41,735 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:02:41,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:02:41,797 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:02:41,803 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:02:41,804 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:02:41,815 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:02:41,816 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:02:44,134 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:44,134 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:02:48,174 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:48,195 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:02:48,195 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 162 [2019-02-18 10:02:48,196 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:02:48,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 126 states [2019-02-18 10:02:48,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2019-02-18 10:02:48,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11475, Invalid=15257, Unknown=0, NotChecked=0, Total=26732 [2019-02-18 10:02:48,198 INFO L87 Difference]: Start difference. First operand 187 states and 187 transitions. Second operand 126 states. [2019-02-18 10:02:48,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:02:48,766 INFO L93 Difference]: Finished difference Result 192 states and 192 transitions. [2019-02-18 10:02:48,767 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2019-02-18 10:02:48,767 INFO L78 Accepts]: Start accepts. Automaton has 126 states. Word has length 186 [2019-02-18 10:02:48,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:02:48,768 INFO L225 Difference]: With dead ends: 192 [2019-02-18 10:02:48,768 INFO L226 Difference]: Without dead ends: 191 [2019-02-18 10:02:48,769 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 432 GetRequests, 246 SyntacticMatches, 24 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15864 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=11475, Invalid=15257, Unknown=0, NotChecked=0, Total=26732 [2019-02-18 10:02:48,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2019-02-18 10:02:48,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 190. [2019-02-18 10:02:48,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2019-02-18 10:02:48,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 190 transitions. [2019-02-18 10:02:48,773 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 190 transitions. Word has length 186 [2019-02-18 10:02:48,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:02:48,773 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 190 transitions. [2019-02-18 10:02:48,773 INFO L481 AbstractCegarLoop]: Interpolant automaton has 126 states. [2019-02-18 10:02:48,773 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 190 transitions. [2019-02-18 10:02:48,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2019-02-18 10:02:48,774 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:02:48,774 INFO L402 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1] [2019-02-18 10:02:48,774 INFO L423 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:02:48,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:02:48,775 INFO L82 PathProgramCache]: Analyzing trace with hash -1036862304, now seen corresponding path program 62 times [2019-02-18 10:02:48,775 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:02:48,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:02:48,775 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:02:48,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:02:48,775 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:02:48,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:02:50,796 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:50,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:02:50,797 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:02:50,797 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:02:50,797 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:02:50,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:02:50,797 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:02:50,806 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:02:50,806 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:02:51,076 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 63 check-sat command(s) [2019-02-18 10:02:51,077 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:02:51,085 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:02:51,088 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:02:51,089 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:02:51,098 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:02:51,098 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:02:53,482 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:53,482 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:02:57,515 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:02:57,535 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:02:57,536 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 163 [2019-02-18 10:02:57,536 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:02:57,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2019-02-18 10:02:57,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2019-02-18 10:02:57,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11577, Invalid=15483, Unknown=0, NotChecked=0, Total=27060 [2019-02-18 10:02:57,538 INFO L87 Difference]: Start difference. First operand 190 states and 190 transitions. Second operand 128 states. [2019-02-18 10:02:58,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:02:58,097 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2019-02-18 10:02:58,097 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2019-02-18 10:02:58,097 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 189 [2019-02-18 10:02:58,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:02:58,099 INFO L225 Difference]: With dead ends: 195 [2019-02-18 10:02:58,099 INFO L226 Difference]: Without dead ends: 194 [2019-02-18 10:02:58,100 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 439 GetRequests, 250 SyntacticMatches, 26 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16361 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=11577, Invalid=15483, Unknown=0, NotChecked=0, Total=27060 [2019-02-18 10:02:58,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2019-02-18 10:02:58,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2019-02-18 10:02:58,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2019-02-18 10:02:58,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 193 transitions. [2019-02-18 10:02:58,104 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 193 transitions. Word has length 189 [2019-02-18 10:02:58,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:02:58,105 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 193 transitions. [2019-02-18 10:02:58,105 INFO L481 AbstractCegarLoop]: Interpolant automaton has 128 states. [2019-02-18 10:02:58,105 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 193 transitions. [2019-02-18 10:02:58,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2019-02-18 10:02:58,105 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:02:58,106 INFO L402 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1] [2019-02-18 10:02:58,106 INFO L423 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:02:58,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:02:58,106 INFO L82 PathProgramCache]: Analyzing trace with hash 239935884, now seen corresponding path program 63 times [2019-02-18 10:02:58,106 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:02:58,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:02:58,107 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:02:58,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:02:58,107 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:02:58,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:03:00,099 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:00,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:03:00,100 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:03:00,100 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:03:00,100 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:03:00,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:03:00,100 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:03:00,111 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:03:00,111 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:03:00,180 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:03:00,180 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:03:00,187 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:03:00,193 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:03:00,194 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:03:00,202 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:03:00,202 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:03:02,814 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:02,814 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:03:06,949 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:06,970 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:03:06,970 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 164 [2019-02-18 10:03:06,971 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:03:06,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 130 states [2019-02-18 10:03:06,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2019-02-18 10:03:06,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11679, Invalid=15711, Unknown=0, NotChecked=0, Total=27390 [2019-02-18 10:03:06,973 INFO L87 Difference]: Start difference. First operand 193 states and 193 transitions. Second operand 130 states. [2019-02-18 10:03:07,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:03:07,528 INFO L93 Difference]: Finished difference Result 198 states and 198 transitions. [2019-02-18 10:03:07,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2019-02-18 10:03:07,528 INFO L78 Accepts]: Start accepts. Automaton has 130 states. Word has length 192 [2019-02-18 10:03:07,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:03:07,530 INFO L225 Difference]: With dead ends: 198 [2019-02-18 10:03:07,530 INFO L226 Difference]: Without dead ends: 197 [2019-02-18 10:03:07,531 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 254 SyntacticMatches, 28 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16858 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=11679, Invalid=15711, Unknown=0, NotChecked=0, Total=27390 [2019-02-18 10:03:07,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2019-02-18 10:03:07,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 196. [2019-02-18 10:03:07,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2019-02-18 10:03:07,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2019-02-18 10:03:07,537 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 192 [2019-02-18 10:03:07,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:03:07,537 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2019-02-18 10:03:07,537 INFO L481 AbstractCegarLoop]: Interpolant automaton has 130 states. [2019-02-18 10:03:07,537 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2019-02-18 10:03:07,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2019-02-18 10:03:07,538 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:03:07,538 INFO L402 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1] [2019-02-18 10:03:07,539 INFO L423 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:03:07,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:03:07,539 INFO L82 PathProgramCache]: Analyzing trace with hash 1104381216, now seen corresponding path program 64 times [2019-02-18 10:03:07,539 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:03:07,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:03:07,540 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:03:07,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:03:07,540 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:03:07,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:03:09,619 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:09,620 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:03:09,620 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:03:09,620 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:03:09,620 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:03:09,620 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:03:09,620 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:03:09,629 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:03:09,630 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:03:09,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:03:09,693 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:03:09,700 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:03:09,700 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:03:09,714 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:03:09,715 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:03:12,545 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:12,545 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:03:16,707 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:16,726 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:03:16,726 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 165 [2019-02-18 10:03:16,726 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:03:16,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2019-02-18 10:03:16,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2019-02-18 10:03:16,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11781, Invalid=15941, Unknown=0, NotChecked=0, Total=27722 [2019-02-18 10:03:16,729 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 132 states. [2019-02-18 10:03:17,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:03:17,226 INFO L93 Difference]: Finished difference Result 201 states and 201 transitions. [2019-02-18 10:03:17,227 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2019-02-18 10:03:17,227 INFO L78 Accepts]: Start accepts. Automaton has 132 states. Word has length 195 [2019-02-18 10:03:17,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:03:17,228 INFO L225 Difference]: With dead ends: 201 [2019-02-18 10:03:17,229 INFO L226 Difference]: Without dead ends: 200 [2019-02-18 10:03:17,230 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 258 SyntacticMatches, 30 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17355 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=11781, Invalid=15941, Unknown=0, NotChecked=0, Total=27722 [2019-02-18 10:03:17,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2019-02-18 10:03:17,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 199. [2019-02-18 10:03:17,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2019-02-18 10:03:17,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 199 transitions. [2019-02-18 10:03:17,236 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 199 transitions. Word has length 195 [2019-02-18 10:03:17,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:03:17,237 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 199 transitions. [2019-02-18 10:03:17,237 INFO L481 AbstractCegarLoop]: Interpolant automaton has 132 states. [2019-02-18 10:03:17,237 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 199 transitions. [2019-02-18 10:03:17,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2019-02-18 10:03:17,238 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:03:17,238 INFO L402 BasicCegarLoop]: trace histogram [66, 65, 65, 1, 1] [2019-02-18 10:03:17,238 INFO L423 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:03:17,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:03:17,239 INFO L82 PathProgramCache]: Analyzing trace with hash 1171360012, now seen corresponding path program 65 times [2019-02-18 10:03:17,239 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:03:17,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:03:17,240 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:03:17,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:03:17,240 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:03:17,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:03:19,402 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:19,402 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:03:19,403 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:03:19,403 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:03:19,403 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:03:19,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:03:19,403 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:03:19,414 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:03:19,415 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:03:19,708 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2019-02-18 10:03:19,708 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:03:19,716 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:03:19,719 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:03:19,719 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:03:19,727 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:03:19,728 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:03:22,539 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:22,540 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:03:26,383 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:26,404 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:03:26,405 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 166 [2019-02-18 10:03:26,405 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:03:26,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2019-02-18 10:03:26,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2019-02-18 10:03:26,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11883, Invalid=16173, Unknown=0, NotChecked=0, Total=28056 [2019-02-18 10:03:26,407 INFO L87 Difference]: Start difference. First operand 199 states and 199 transitions. Second operand 134 states. [2019-02-18 10:03:27,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:03:27,026 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2019-02-18 10:03:27,026 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2019-02-18 10:03:27,026 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 198 [2019-02-18 10:03:27,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:03:27,027 INFO L225 Difference]: With dead ends: 204 [2019-02-18 10:03:27,027 INFO L226 Difference]: Without dead ends: 203 [2019-02-18 10:03:27,028 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 262 SyntacticMatches, 32 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17852 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=11883, Invalid=16173, Unknown=0, NotChecked=0, Total=28056 [2019-02-18 10:03:27,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2019-02-18 10:03:27,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 202. [2019-02-18 10:03:27,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2019-02-18 10:03:27,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 202 transitions. [2019-02-18 10:03:27,033 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 202 transitions. Word has length 198 [2019-02-18 10:03:27,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:03:27,033 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 202 transitions. [2019-02-18 10:03:27,033 INFO L481 AbstractCegarLoop]: Interpolant automaton has 134 states. [2019-02-18 10:03:27,033 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 202 transitions. [2019-02-18 10:03:27,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2019-02-18 10:03:27,034 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:03:27,034 INFO L402 BasicCegarLoop]: trace histogram [67, 66, 66, 1, 1] [2019-02-18 10:03:27,035 INFO L423 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:03:27,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:03:27,035 INFO L82 PathProgramCache]: Analyzing trace with hash -623120992, now seen corresponding path program 66 times [2019-02-18 10:03:27,035 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:03:27,036 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:03:27,036 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:03:27,036 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:03:27,036 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:03:27,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:03:29,435 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:29,436 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:03:29,436 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:03:29,436 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:03:29,436 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:03:29,436 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:03:29,436 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:03:29,445 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:03:29,445 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:03:29,515 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:03:29,515 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:03:29,522 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:03:29,524 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:03:29,525 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:03:29,536 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:03:29,536 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:03:32,243 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:32,243 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:03:36,172 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:36,192 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:03:36,192 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 167 [2019-02-18 10:03:36,192 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:03:36,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 136 states [2019-02-18 10:03:36,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2019-02-18 10:03:36,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11985, Invalid=16407, Unknown=0, NotChecked=0, Total=28392 [2019-02-18 10:03:36,195 INFO L87 Difference]: Start difference. First operand 202 states and 202 transitions. Second operand 136 states. [2019-02-18 10:03:36,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:03:36,728 INFO L93 Difference]: Finished difference Result 207 states and 207 transitions. [2019-02-18 10:03:36,729 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2019-02-18 10:03:36,729 INFO L78 Accepts]: Start accepts. Automaton has 136 states. Word has length 201 [2019-02-18 10:03:36,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:03:36,730 INFO L225 Difference]: With dead ends: 207 [2019-02-18 10:03:36,730 INFO L226 Difference]: Without dead ends: 206 [2019-02-18 10:03:36,732 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 266 SyntacticMatches, 34 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18349 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=11985, Invalid=16407, Unknown=0, NotChecked=0, Total=28392 [2019-02-18 10:03:36,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2019-02-18 10:03:36,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 205. [2019-02-18 10:03:36,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2019-02-18 10:03:36,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 205 transitions. [2019-02-18 10:03:36,736 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 205 transitions. Word has length 201 [2019-02-18 10:03:36,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:03:36,736 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 205 transitions. [2019-02-18 10:03:36,736 INFO L481 AbstractCegarLoop]: Interpolant automaton has 136 states. [2019-02-18 10:03:36,736 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 205 transitions. [2019-02-18 10:03:36,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2019-02-18 10:03:36,737 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:03:36,737 INFO L402 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1] [2019-02-18 10:03:36,738 INFO L423 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:03:36,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:03:36,738 INFO L82 PathProgramCache]: Analyzing trace with hash -548777844, now seen corresponding path program 67 times [2019-02-18 10:03:36,738 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:03:36,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:03:36,739 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:03:36,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:03:36,739 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:03:36,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:03:38,993 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:38,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:03:38,993 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:03:38,993 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:03:38,994 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:03:38,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:03:38,994 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:03:39,005 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:03:39,006 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:03:39,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:03:39,068 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:03:39,071 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:03:39,071 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:03:39,079 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:03:39,079 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:03:41,731 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:41,731 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:03:45,818 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:45,837 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:03:45,837 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 168 [2019-02-18 10:03:45,838 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:03:45,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 138 states [2019-02-18 10:03:45,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 138 interpolants. [2019-02-18 10:03:45,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12087, Invalid=16643, Unknown=0, NotChecked=0, Total=28730 [2019-02-18 10:03:45,840 INFO L87 Difference]: Start difference. First operand 205 states and 205 transitions. Second operand 138 states. [2019-02-18 10:03:46,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:03:46,275 INFO L93 Difference]: Finished difference Result 210 states and 210 transitions. [2019-02-18 10:03:46,276 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2019-02-18 10:03:46,276 INFO L78 Accepts]: Start accepts. Automaton has 138 states. Word has length 204 [2019-02-18 10:03:46,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:03:46,277 INFO L225 Difference]: With dead ends: 210 [2019-02-18 10:03:46,277 INFO L226 Difference]: Without dead ends: 209 [2019-02-18 10:03:46,278 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 270 SyntacticMatches, 36 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18846 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=12087, Invalid=16643, Unknown=0, NotChecked=0, Total=28730 [2019-02-18 10:03:46,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2019-02-18 10:03:46,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 208. [2019-02-18 10:03:46,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2019-02-18 10:03:46,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 208 transitions. [2019-02-18 10:03:46,282 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 208 transitions. Word has length 204 [2019-02-18 10:03:46,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:03:46,282 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 208 transitions. [2019-02-18 10:03:46,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has 138 states. [2019-02-18 10:03:46,282 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 208 transitions. [2019-02-18 10:03:46,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2019-02-18 10:03:46,283 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:03:46,283 INFO L402 BasicCegarLoop]: trace histogram [69, 68, 68, 1, 1] [2019-02-18 10:03:46,283 INFO L423 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:03:46,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:03:46,283 INFO L82 PathProgramCache]: Analyzing trace with hash -1995180512, now seen corresponding path program 68 times [2019-02-18 10:03:46,283 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:03:46,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:03:46,284 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:03:46,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:03:46,284 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:03:46,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:03:48,714 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:48,715 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:03:48,715 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:03:48,715 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:03:48,715 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:03:48,715 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:03:48,715 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:03:48,725 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:03:48,725 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:03:49,016 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2019-02-18 10:03:49,016 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:03:49,024 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:03:49,026 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:03:49,027 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:03:49,040 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:03:49,041 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:03:51,750 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:51,750 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:03:55,942 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:55,962 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:03:55,962 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 169 [2019-02-18 10:03:55,962 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:03:55,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2019-02-18 10:03:55,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2019-02-18 10:03:55,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12189, Invalid=16881, Unknown=0, NotChecked=0, Total=29070 [2019-02-18 10:03:55,965 INFO L87 Difference]: Start difference. First operand 208 states and 208 transitions. Second operand 140 states. [2019-02-18 10:03:56,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:03:56,530 INFO L93 Difference]: Finished difference Result 213 states and 213 transitions. [2019-02-18 10:03:56,530 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2019-02-18 10:03:56,531 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 207 [2019-02-18 10:03:56,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:03:56,532 INFO L225 Difference]: With dead ends: 213 [2019-02-18 10:03:56,532 INFO L226 Difference]: Without dead ends: 212 [2019-02-18 10:03:56,534 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 274 SyntacticMatches, 38 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19343 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=12189, Invalid=16881, Unknown=0, NotChecked=0, Total=29070 [2019-02-18 10:03:56,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2019-02-18 10:03:56,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 211. [2019-02-18 10:03:56,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 211 states. [2019-02-18 10:03:56,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 211 transitions. [2019-02-18 10:03:56,540 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 211 transitions. Word has length 207 [2019-02-18 10:03:56,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:03:56,540 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 211 transitions. [2019-02-18 10:03:56,540 INFO L481 AbstractCegarLoop]: Interpolant automaton has 140 states. [2019-02-18 10:03:56,540 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 211 transitions. [2019-02-18 10:03:56,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2019-02-18 10:03:56,541 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:03:56,541 INFO L402 BasicCegarLoop]: trace histogram [70, 69, 69, 1, 1] [2019-02-18 10:03:56,542 INFO L423 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:03:56,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:03:56,542 INFO L82 PathProgramCache]: Analyzing trace with hash -370182132, now seen corresponding path program 69 times [2019-02-18 10:03:56,542 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:03:56,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:03:56,543 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:03:56,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:03:56,543 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:03:56,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:03:59,235 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:03:59,236 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:03:59,236 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:03:59,236 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:03:59,236 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:03:59,236 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:03:59,236 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:03:59,246 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:03:59,246 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:03:59,314 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:03:59,315 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:03:59,322 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:03:59,326 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:03:59,326 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:03:59,335 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:03:59,335 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:04:02,124 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:04:02,124 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:04:06,360 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:04:06,379 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:04:06,379 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 170 [2019-02-18 10:04:06,380 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:04:06,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 142 states [2019-02-18 10:04:06,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2019-02-18 10:04:06,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12291, Invalid=17121, Unknown=0, NotChecked=0, Total=29412 [2019-02-18 10:04:06,383 INFO L87 Difference]: Start difference. First operand 211 states and 211 transitions. Second operand 142 states. [2019-02-18 10:04:06,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:04:06,881 INFO L93 Difference]: Finished difference Result 216 states and 216 transitions. [2019-02-18 10:04:06,881 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2019-02-18 10:04:06,881 INFO L78 Accepts]: Start accepts. Automaton has 142 states. Word has length 210 [2019-02-18 10:04:06,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:04:06,883 INFO L225 Difference]: With dead ends: 216 [2019-02-18 10:04:06,883 INFO L226 Difference]: Without dead ends: 215 [2019-02-18 10:04:06,884 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 278 SyntacticMatches, 40 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19840 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=12291, Invalid=17121, Unknown=0, NotChecked=0, Total=29412 [2019-02-18 10:04:06,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2019-02-18 10:04:06,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 214. [2019-02-18 10:04:06,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2019-02-18 10:04:06,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 214 transitions. [2019-02-18 10:04:06,890 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 214 transitions. Word has length 210 [2019-02-18 10:04:06,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:04:06,890 INFO L480 AbstractCegarLoop]: Abstraction has 214 states and 214 transitions. [2019-02-18 10:04:06,890 INFO L481 AbstractCegarLoop]: Interpolant automaton has 142 states. [2019-02-18 10:04:06,891 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 214 transitions. [2019-02-18 10:04:06,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2019-02-18 10:04:06,892 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:04:06,892 INFO L402 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1] [2019-02-18 10:04:06,892 INFO L423 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:04:06,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:04:06,892 INFO L82 PathProgramCache]: Analyzing trace with hash 1380163232, now seen corresponding path program 70 times [2019-02-18 10:04:06,892 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:04:06,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:04:06,893 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:04:06,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:04:06,893 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:04:06,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:04:09,463 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:04:09,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:04:09,464 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:04:09,464 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:04:09,464 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:04:09,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:04:09,464 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:04:09,472 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:04:09,472 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:04:09,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:04:09,540 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:04:09,543 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:04:09,543 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:04:09,555 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:04:09,555 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:04:12,446 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:04:12,446 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:04:16,720 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:04:16,739 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:04:16,739 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 171 [2019-02-18 10:04:16,740 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:04:16,740 INFO L459 AbstractCegarLoop]: Interpolant automaton has 144 states [2019-02-18 10:04:16,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2019-02-18 10:04:16,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12393, Invalid=17363, Unknown=0, NotChecked=0, Total=29756 [2019-02-18 10:04:16,742 INFO L87 Difference]: Start difference. First operand 214 states and 214 transitions. Second operand 144 states. [2019-02-18 10:04:17,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:04:17,212 INFO L93 Difference]: Finished difference Result 219 states and 219 transitions. [2019-02-18 10:04:17,212 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2019-02-18 10:04:17,212 INFO L78 Accepts]: Start accepts. Automaton has 144 states. Word has length 213 [2019-02-18 10:04:17,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:04:17,214 INFO L225 Difference]: With dead ends: 219 [2019-02-18 10:04:17,214 INFO L226 Difference]: Without dead ends: 218 [2019-02-18 10:04:17,215 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 282 SyntacticMatches, 42 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20337 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=12393, Invalid=17363, Unknown=0, NotChecked=0, Total=29756 [2019-02-18 10:04:17,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2019-02-18 10:04:17,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 217. [2019-02-18 10:04:17,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2019-02-18 10:04:17,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 217 transitions. [2019-02-18 10:04:17,219 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 217 transitions. Word has length 213 [2019-02-18 10:04:17,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:04:17,219 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 217 transitions. [2019-02-18 10:04:17,219 INFO L481 AbstractCegarLoop]: Interpolant automaton has 144 states. [2019-02-18 10:04:17,220 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 217 transitions. [2019-02-18 10:04:17,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2019-02-18 10:04:17,221 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:04:17,221 INFO L402 BasicCegarLoop]: trace histogram [72, 71, 71, 1, 1] [2019-02-18 10:04:17,221 INFO L423 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:04:17,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:04:17,221 INFO L82 PathProgramCache]: Analyzing trace with hash 720961420, now seen corresponding path program 71 times [2019-02-18 10:04:17,221 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:04:17,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:04:17,222 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:04:17,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:04:17,222 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:04:17,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:04:20,022 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 0 proven. 7597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:04:20,022 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:04:20,022 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:04:20,022 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:04:20,023 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:04:20,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:04:20,023 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:04:20,032 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:04:20,032 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:04:20,349 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 72 check-sat command(s) [2019-02-18 10:04:20,349 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:04:20,357 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:04:20,359 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:04:20,360 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:04:20,370 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:04:20,370 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:04:23,508 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 0 proven. 7597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:04:23,508 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:04:27,548 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 0 proven. 7597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:04:27,568 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:04:27,568 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 172 [2019-02-18 10:04:27,568 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:04:27,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2019-02-18 10:04:27,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2019-02-18 10:04:27,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12495, Invalid=17607, Unknown=0, NotChecked=0, Total=30102 [2019-02-18 10:04:27,572 INFO L87 Difference]: Start difference. First operand 217 states and 217 transitions. Second operand 146 states. [2019-02-18 10:04:28,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:04:28,094 INFO L93 Difference]: Finished difference Result 222 states and 222 transitions. [2019-02-18 10:04:28,094 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2019-02-18 10:04:28,094 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 216 [2019-02-18 10:04:28,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:04:28,095 INFO L225 Difference]: With dead ends: 222 [2019-02-18 10:04:28,095 INFO L226 Difference]: Without dead ends: 221 [2019-02-18 10:04:28,097 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 286 SyntacticMatches, 44 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20834 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=12495, Invalid=17607, Unknown=0, NotChecked=0, Total=30102 [2019-02-18 10:04:28,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2019-02-18 10:04:28,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 220. [2019-02-18 10:04:28,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2019-02-18 10:04:28,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 220 transitions. [2019-02-18 10:04:28,101 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 220 transitions. Word has length 216 [2019-02-18 10:04:28,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:04:28,101 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 220 transitions. [2019-02-18 10:04:28,101 INFO L481 AbstractCegarLoop]: Interpolant automaton has 146 states. [2019-02-18 10:04:28,101 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 220 transitions. [2019-02-18 10:04:28,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2019-02-18 10:04:28,102 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:04:28,102 INFO L402 BasicCegarLoop]: trace histogram [73, 72, 72, 1, 1] [2019-02-18 10:04:28,103 INFO L423 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:04:28,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:04:28,103 INFO L82 PathProgramCache]: Analyzing trace with hash -969742560, now seen corresponding path program 72 times [2019-02-18 10:04:28,103 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:04:28,104 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:04:28,104 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:04:28,104 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:04:28,104 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:04:28,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:04:30,708 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 0 proven. 7812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:04:30,708 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:04:30,708 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:04:30,708 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:04:30,708 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:04:30,708 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:04:30,708 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:04:30,716 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:04:30,717 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:04:30,787 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:04:30,788 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:04:30,795 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:04:30,798 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:04:30,799 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:04:30,813 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:04:30,813 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:04:34,150 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 0 proven. 7812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:04:34,150 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:04:38,183 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 0 proven. 7812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:04:38,202 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:04:38,203 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 173 [2019-02-18 10:04:38,203 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:04:38,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 148 states [2019-02-18 10:04:38,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2019-02-18 10:04:38,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12597, Invalid=17853, Unknown=0, NotChecked=0, Total=30450 [2019-02-18 10:04:38,206 INFO L87 Difference]: Start difference. First operand 220 states and 220 transitions. Second operand 148 states. [2019-02-18 10:04:38,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:04:38,755 INFO L93 Difference]: Finished difference Result 225 states and 225 transitions. [2019-02-18 10:04:38,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2019-02-18 10:04:38,756 INFO L78 Accepts]: Start accepts. Automaton has 148 states. Word has length 219 [2019-02-18 10:04:38,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:04:38,757 INFO L225 Difference]: With dead ends: 225 [2019-02-18 10:04:38,758 INFO L226 Difference]: Without dead ends: 224 [2019-02-18 10:04:38,759 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 290 SyntacticMatches, 46 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21331 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=12597, Invalid=17853, Unknown=0, NotChecked=0, Total=30450 [2019-02-18 10:04:38,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2019-02-18 10:04:38,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 223. [2019-02-18 10:04:38,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2019-02-18 10:04:38,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 223 transitions. [2019-02-18 10:04:38,764 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 223 transitions. Word has length 219 [2019-02-18 10:04:38,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:04:38,765 INFO L480 AbstractCegarLoop]: Abstraction has 223 states and 223 transitions. [2019-02-18 10:04:38,765 INFO L481 AbstractCegarLoop]: Interpolant automaton has 148 states. [2019-02-18 10:04:38,765 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 223 transitions. [2019-02-18 10:04:38,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2019-02-18 10:04:38,765 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:04:38,766 INFO L402 BasicCegarLoop]: trace histogram [74, 73, 73, 1, 1] [2019-02-18 10:04:38,766 INFO L423 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:04:38,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:04:38,766 INFO L82 PathProgramCache]: Analyzing trace with hash -1650530548, now seen corresponding path program 73 times [2019-02-18 10:04:38,766 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:04:38,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:04:38,767 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:04:38,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:04:38,767 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:04:38,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:04:41,350 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:04:41,350 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:04:41,350 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:04:41,351 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:04:41,351 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:04:41,351 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:04:41,351 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:04:41,360 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:04:41,360 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:04:41,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:04:41,431 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:04:41,434 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:04:41,434 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:04:41,444 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:04:41,444 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:04:44,917 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:04:44,917 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:04:49,291 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:04:49,310 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:04:49,310 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 174 [2019-02-18 10:04:49,310 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:04:49,311 INFO L459 AbstractCegarLoop]: Interpolant automaton has 150 states [2019-02-18 10:04:49,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 150 interpolants. [2019-02-18 10:04:49,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12699, Invalid=18101, Unknown=0, NotChecked=0, Total=30800 [2019-02-18 10:04:49,313 INFO L87 Difference]: Start difference. First operand 223 states and 223 transitions. Second operand 150 states. [2019-02-18 10:04:49,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:04:49,864 INFO L93 Difference]: Finished difference Result 228 states and 228 transitions. [2019-02-18 10:04:49,865 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2019-02-18 10:04:49,865 INFO L78 Accepts]: Start accepts. Automaton has 150 states. Word has length 222 [2019-02-18 10:04:49,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:04:49,866 INFO L225 Difference]: With dead ends: 228 [2019-02-18 10:04:49,866 INFO L226 Difference]: Without dead ends: 227 [2019-02-18 10:04:49,867 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 294 SyntacticMatches, 48 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21828 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=12699, Invalid=18101, Unknown=0, NotChecked=0, Total=30800 [2019-02-18 10:04:49,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2019-02-18 10:04:49,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 226. [2019-02-18 10:04:49,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2019-02-18 10:04:49,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 226 transitions. [2019-02-18 10:04:49,871 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 226 transitions. Word has length 222 [2019-02-18 10:04:49,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:04:49,871 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 226 transitions. [2019-02-18 10:04:49,872 INFO L481 AbstractCegarLoop]: Interpolant automaton has 150 states. [2019-02-18 10:04:49,872 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 226 transitions. [2019-02-18 10:04:49,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2019-02-18 10:04:49,872 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:04:49,873 INFO L402 BasicCegarLoop]: trace histogram [75, 74, 74, 1, 1] [2019-02-18 10:04:49,873 INFO L423 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:04:49,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:04:49,873 INFO L82 PathProgramCache]: Analyzing trace with hash 2125057952, now seen corresponding path program 74 times [2019-02-18 10:04:49,873 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:04:49,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:04:49,874 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:04:49,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:04:49,874 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:04:49,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:04:52,527 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 0 proven. 8251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:04:52,527 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:04:52,527 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:04:52,527 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:04:52,527 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:04:52,527 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:04:52,527 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:04:52,536 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:04:52,537 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:04:52,841 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 75 check-sat command(s) [2019-02-18 10:04:52,842 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:04:52,849 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:04:52,851 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:04:52,851 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:04:52,860 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:04:52,860 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:04:56,300 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 0 proven. 8251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:04:56,301 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:05:00,611 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 0 proven. 8251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:05:00,630 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:05:00,630 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 175 [2019-02-18 10:05:00,630 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:05:00,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2019-02-18 10:05:00,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2019-02-18 10:05:00,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12801, Invalid=18351, Unknown=0, NotChecked=0, Total=31152 [2019-02-18 10:05:00,634 INFO L87 Difference]: Start difference. First operand 226 states and 226 transitions. Second operand 152 states. [2019-02-18 10:05:01,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:05:01,255 INFO L93 Difference]: Finished difference Result 231 states and 231 transitions. [2019-02-18 10:05:01,255 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2019-02-18 10:05:01,255 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 225 [2019-02-18 10:05:01,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:05:01,256 INFO L225 Difference]: With dead ends: 231 [2019-02-18 10:05:01,257 INFO L226 Difference]: Without dead ends: 230 [2019-02-18 10:05:01,258 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 298 SyntacticMatches, 50 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22325 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=12801, Invalid=18351, Unknown=0, NotChecked=0, Total=31152 [2019-02-18 10:05:01,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2019-02-18 10:05:01,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 229. [2019-02-18 10:05:01,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2019-02-18 10:05:01,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 229 transitions. [2019-02-18 10:05:01,263 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 229 transitions. Word has length 225 [2019-02-18 10:05:01,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:05:01,264 INFO L480 AbstractCegarLoop]: Abstraction has 229 states and 229 transitions. [2019-02-18 10:05:01,264 INFO L481 AbstractCegarLoop]: Interpolant automaton has 152 states. [2019-02-18 10:05:01,264 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 229 transitions. [2019-02-18 10:05:01,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2019-02-18 10:05:01,265 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:05:01,265 INFO L402 BasicCegarLoop]: trace histogram [76, 75, 75, 1, 1] [2019-02-18 10:05:01,266 INFO L423 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:05:01,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:05:01,266 INFO L82 PathProgramCache]: Analyzing trace with hash -216453492, now seen corresponding path program 75 times [2019-02-18 10:05:01,266 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:05:01,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:05:01,267 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:05:01,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:05:01,267 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:05:01,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:05:04,298 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 0 proven. 8475 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:05:04,299 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:05:04,299 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:05:04,299 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:05:04,299 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:05:04,299 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:05:04,299 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:05:04,308 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:05:04,309 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:05:04,385 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:05:04,385 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:05:04,392 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:05:04,397 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:05:04,397 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:05:04,406 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:05:04,406 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:05:07,740 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 0 proven. 8475 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:05:07,741 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:05:12,085 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 0 proven. 8475 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:05:12,105 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:05:12,105 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 176 [2019-02-18 10:05:12,105 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:05:12,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 154 states [2019-02-18 10:05:12,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2019-02-18 10:05:12,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12903, Invalid=18603, Unknown=0, NotChecked=0, Total=31506 [2019-02-18 10:05:12,108 INFO L87 Difference]: Start difference. First operand 229 states and 229 transitions. Second operand 154 states. [2019-02-18 10:05:12,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:05:12,781 INFO L93 Difference]: Finished difference Result 234 states and 234 transitions. [2019-02-18 10:05:12,781 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2019-02-18 10:05:12,781 INFO L78 Accepts]: Start accepts. Automaton has 154 states. Word has length 228 [2019-02-18 10:05:12,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:05:12,782 INFO L225 Difference]: With dead ends: 234 [2019-02-18 10:05:12,783 INFO L226 Difference]: Without dead ends: 233 [2019-02-18 10:05:12,784 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 302 SyntacticMatches, 52 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22822 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=12903, Invalid=18603, Unknown=0, NotChecked=0, Total=31506 [2019-02-18 10:05:12,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2019-02-18 10:05:12,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 232. [2019-02-18 10:05:12,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2019-02-18 10:05:12,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 232 transitions. [2019-02-18 10:05:12,790 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 232 transitions. Word has length 228 [2019-02-18 10:05:12,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:05:12,790 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 232 transitions. [2019-02-18 10:05:12,791 INFO L481 AbstractCegarLoop]: Interpolant automaton has 154 states. [2019-02-18 10:05:12,791 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 232 transitions. [2019-02-18 10:05:12,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2019-02-18 10:05:12,792 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:05:12,792 INFO L402 BasicCegarLoop]: trace histogram [77, 76, 76, 1, 1] [2019-02-18 10:05:12,792 INFO L423 AbstractCegarLoop]: === Iteration 77 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:05:12,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:05:12,792 INFO L82 PathProgramCache]: Analyzing trace with hash -1620027360, now seen corresponding path program 76 times [2019-02-18 10:05:12,793 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:05:12,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:05:12,793 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:05:12,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:05:12,794 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:05:12,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:05:15,742 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 0 proven. 8702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:05:15,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:05:15,743 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:05:15,743 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:05:15,743 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:05:15,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:05:15,743 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:05:15,752 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:05:15,752 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:05:15,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:05:15,823 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:05:15,829 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:05:15,829 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:05:15,848 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:05:15,848 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:05:19,350 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 0 proven. 8702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:05:19,351 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:05:23,493 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 0 proven. 8702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:05:23,513 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:05:23,513 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 177 [2019-02-18 10:05:23,513 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:05:23,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 156 states [2019-02-18 10:05:23,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 156 interpolants. [2019-02-18 10:05:23,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13005, Invalid=18857, Unknown=0, NotChecked=0, Total=31862 [2019-02-18 10:05:23,517 INFO L87 Difference]: Start difference. First operand 232 states and 232 transitions. Second operand 156 states. [2019-02-18 10:05:24,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:05:24,106 INFO L93 Difference]: Finished difference Result 237 states and 237 transitions. [2019-02-18 10:05:24,106 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2019-02-18 10:05:24,106 INFO L78 Accepts]: Start accepts. Automaton has 156 states. Word has length 231 [2019-02-18 10:05:24,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:05:24,108 INFO L225 Difference]: With dead ends: 237 [2019-02-18 10:05:24,108 INFO L226 Difference]: Without dead ends: 236 [2019-02-18 10:05:24,109 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 537 GetRequests, 306 SyntacticMatches, 54 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23319 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=13005, Invalid=18857, Unknown=0, NotChecked=0, Total=31862 [2019-02-18 10:05:24,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2019-02-18 10:05:24,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 235. [2019-02-18 10:05:24,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 235 states. [2019-02-18 10:05:24,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 235 transitions. [2019-02-18 10:05:24,114 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 235 transitions. Word has length 231 [2019-02-18 10:05:24,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:05:24,114 INFO L480 AbstractCegarLoop]: Abstraction has 235 states and 235 transitions. [2019-02-18 10:05:24,114 INFO L481 AbstractCegarLoop]: Interpolant automaton has 156 states. [2019-02-18 10:05:24,114 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 235 transitions. [2019-02-18 10:05:24,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2019-02-18 10:05:24,115 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:05:24,115 INFO L402 BasicCegarLoop]: trace histogram [78, 77, 77, 1, 1] [2019-02-18 10:05:24,116 INFO L423 AbstractCegarLoop]: === Iteration 78 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:05:24,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:05:24,116 INFO L82 PathProgramCache]: Analyzing trace with hash 312464908, now seen corresponding path program 77 times [2019-02-18 10:05:24,116 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:05:24,116 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:05:24,116 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:05:24,117 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:05:24,117 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:05:24,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:05:27,239 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 0 proven. 8932 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:05:27,239 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:05:27,239 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:05:27,239 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:05:27,239 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:05:27,240 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:05:27,240 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:05:27,247 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:05:27,248 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:05:27,623 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2019-02-18 10:05:27,624 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:05:27,632 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:05:27,637 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:05:27,637 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:05:27,646 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:05:27,647 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:05:31,350 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 0 proven. 8932 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:05:31,351 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:05:35,626 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 0 proven. 8932 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:05:35,645 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:05:35,646 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78, 78] total 178 [2019-02-18 10:05:35,646 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:05:35,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2019-02-18 10:05:35,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2019-02-18 10:05:35,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13107, Invalid=19113, Unknown=0, NotChecked=0, Total=32220 [2019-02-18 10:05:35,649 INFO L87 Difference]: Start difference. First operand 235 states and 235 transitions. Second operand 158 states. [2019-02-18 10:05:36,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:05:36,320 INFO L93 Difference]: Finished difference Result 240 states and 240 transitions. [2019-02-18 10:05:36,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2019-02-18 10:05:36,321 INFO L78 Accepts]: Start accepts. Automaton has 158 states. Word has length 234 [2019-02-18 10:05:36,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:05:36,322 INFO L225 Difference]: With dead ends: 240 [2019-02-18 10:05:36,322 INFO L226 Difference]: Without dead ends: 239 [2019-02-18 10:05:36,323 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 544 GetRequests, 310 SyntacticMatches, 56 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23816 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=13107, Invalid=19113, Unknown=0, NotChecked=0, Total=32220 [2019-02-18 10:05:36,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2019-02-18 10:05:36,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 238. [2019-02-18 10:05:36,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2019-02-18 10:05:36,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 238 transitions. [2019-02-18 10:05:36,328 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 238 transitions. Word has length 234 [2019-02-18 10:05:36,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:05:36,328 INFO L480 AbstractCegarLoop]: Abstraction has 238 states and 238 transitions. [2019-02-18 10:05:36,328 INFO L481 AbstractCegarLoop]: Interpolant automaton has 158 states. [2019-02-18 10:05:36,328 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 238 transitions. [2019-02-18 10:05:36,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2019-02-18 10:05:36,329 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:05:36,329 INFO L402 BasicCegarLoop]: trace histogram [79, 78, 78, 1, 1] [2019-02-18 10:05:36,329 INFO L423 AbstractCegarLoop]: === Iteration 79 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:05:36,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:05:36,329 INFO L82 PathProgramCache]: Analyzing trace with hash 1447985312, now seen corresponding path program 78 times [2019-02-18 10:05:36,330 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:05:36,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:05:36,330 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:05:36,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:05:36,330 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:05:36,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:05:39,218 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 0 proven. 9165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:05:39,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:05:39,219 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:05:39,219 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:05:39,219 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:05:39,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:05:39,219 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:05:39,228 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:05:39,229 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:05:39,312 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:05:39,312 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:05:39,320 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:05:39,323 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:05:39,323 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:05:39,333 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:05:39,333 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:05:43,143 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 0 proven. 9165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:05:43,143 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:05:47,433 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 0 proven. 9165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:05:47,453 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:05:47,453 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 179 [2019-02-18 10:05:47,453 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:05:47,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 160 states [2019-02-18 10:05:47,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2019-02-18 10:05:47,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13209, Invalid=19371, Unknown=0, NotChecked=0, Total=32580 [2019-02-18 10:05:47,456 INFO L87 Difference]: Start difference. First operand 238 states and 238 transitions. Second operand 160 states. [2019-02-18 10:05:48,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:05:48,081 INFO L93 Difference]: Finished difference Result 243 states and 243 transitions. [2019-02-18 10:05:48,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2019-02-18 10:05:48,081 INFO L78 Accepts]: Start accepts. Automaton has 160 states. Word has length 237 [2019-02-18 10:05:48,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:05:48,083 INFO L225 Difference]: With dead ends: 243 [2019-02-18 10:05:48,083 INFO L226 Difference]: Without dead ends: 242 [2019-02-18 10:05:48,085 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 551 GetRequests, 314 SyntacticMatches, 58 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24313 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=13209, Invalid=19371, Unknown=0, NotChecked=0, Total=32580 [2019-02-18 10:05:48,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2019-02-18 10:05:48,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 241. [2019-02-18 10:05:48,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2019-02-18 10:05:48,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 241 transitions. [2019-02-18 10:05:48,090 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 241 transitions. Word has length 237 [2019-02-18 10:05:48,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:05:48,091 INFO L480 AbstractCegarLoop]: Abstraction has 241 states and 241 transitions. [2019-02-18 10:05:48,091 INFO L481 AbstractCegarLoop]: Interpolant automaton has 160 states. [2019-02-18 10:05:48,091 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 241 transitions. [2019-02-18 10:05:48,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2019-02-18 10:05:48,092 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:05:48,092 INFO L402 BasicCegarLoop]: trace histogram [80, 79, 79, 1, 1] [2019-02-18 10:05:48,092 INFO L423 AbstractCegarLoop]: === Iteration 80 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:05:48,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:05:48,093 INFO L82 PathProgramCache]: Analyzing trace with hash -1721049716, now seen corresponding path program 79 times [2019-02-18 10:05:48,093 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:05:48,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:05:48,093 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:05:48,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:05:48,094 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:05:48,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:05:51,434 INFO L134 CoverageAnalysis]: Checked inductivity of 9401 backedges. 0 proven. 9401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:05:51,435 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:05:51,435 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:05:51,435 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:05:51,435 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:05:51,435 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:05:51,435 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:05:51,443 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:05:51,444 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:05:51,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:05:51,517 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:05:51,520 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:05:51,520 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:05:51,537 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:05:51,537 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:05:55,291 INFO L134 CoverageAnalysis]: Checked inductivity of 9401 backedges. 0 proven. 9401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:05:55,291 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:05:59,473 INFO L134 CoverageAnalysis]: Checked inductivity of 9401 backedges. 0 proven. 9401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:05:59,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:05:59,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 180 [2019-02-18 10:05:59,494 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:05:59,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 162 states [2019-02-18 10:05:59,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 162 interpolants. [2019-02-18 10:05:59,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13311, Invalid=19631, Unknown=0, NotChecked=0, Total=32942 [2019-02-18 10:05:59,497 INFO L87 Difference]: Start difference. First operand 241 states and 241 transitions. Second operand 162 states. [2019-02-18 10:06:00,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:06:00,165 INFO L93 Difference]: Finished difference Result 246 states and 246 transitions. [2019-02-18 10:06:00,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2019-02-18 10:06:00,165 INFO L78 Accepts]: Start accepts. Automaton has 162 states. Word has length 240 [2019-02-18 10:06:00,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:06:00,166 INFO L225 Difference]: With dead ends: 246 [2019-02-18 10:06:00,167 INFO L226 Difference]: Without dead ends: 245 [2019-02-18 10:06:00,168 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 558 GetRequests, 318 SyntacticMatches, 60 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24810 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=13311, Invalid=19631, Unknown=0, NotChecked=0, Total=32942 [2019-02-18 10:06:00,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2019-02-18 10:06:00,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 244. [2019-02-18 10:06:00,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2019-02-18 10:06:00,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 244 transitions. [2019-02-18 10:06:00,172 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 244 transitions. Word has length 240 [2019-02-18 10:06:00,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:06:00,172 INFO L480 AbstractCegarLoop]: Abstraction has 244 states and 244 transitions. [2019-02-18 10:06:00,172 INFO L481 AbstractCegarLoop]: Interpolant automaton has 162 states. [2019-02-18 10:06:00,172 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 244 transitions. [2019-02-18 10:06:00,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2019-02-18 10:06:00,173 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:06:00,173 INFO L402 BasicCegarLoop]: trace histogram [81, 80, 80, 1, 1] [2019-02-18 10:06:00,173 INFO L423 AbstractCegarLoop]: === Iteration 81 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:06:00,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:06:00,174 INFO L82 PathProgramCache]: Analyzing trace with hash 1527531808, now seen corresponding path program 80 times [2019-02-18 10:06:00,174 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:06:00,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:06:00,174 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:06:00,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:06:00,175 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:06:00,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:06:03,606 INFO L134 CoverageAnalysis]: Checked inductivity of 9640 backedges. 0 proven. 9640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:06:03,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:06:03,606 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:06:03,607 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:06:03,607 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:06:03,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:06:03,607 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:06:03,615 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:06:03,615 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:06:04,016 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 81 check-sat command(s) [2019-02-18 10:06:04,017 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:06:04,027 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:06:04,030 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:06:04,030 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:06:04,041 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:06:04,041 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:06:07,922 INFO L134 CoverageAnalysis]: Checked inductivity of 9640 backedges. 0 proven. 9640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:06:07,922 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:06:12,254 INFO L134 CoverageAnalysis]: Checked inductivity of 9640 backedges. 0 proven. 9640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:06:12,276 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:06:12,276 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 181 [2019-02-18 10:06:12,277 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:06:12,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 164 states [2019-02-18 10:06:12,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2019-02-18 10:06:12,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13413, Invalid=19893, Unknown=0, NotChecked=0, Total=33306 [2019-02-18 10:06:12,280 INFO L87 Difference]: Start difference. First operand 244 states and 244 transitions. Second operand 164 states. [2019-02-18 10:06:12,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:06:12,857 INFO L93 Difference]: Finished difference Result 249 states and 249 transitions. [2019-02-18 10:06:12,857 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2019-02-18 10:06:12,857 INFO L78 Accepts]: Start accepts. Automaton has 164 states. Word has length 243 [2019-02-18 10:06:12,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:06:12,858 INFO L225 Difference]: With dead ends: 249 [2019-02-18 10:06:12,859 INFO L226 Difference]: Without dead ends: 248 [2019-02-18 10:06:12,859 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 565 GetRequests, 322 SyntacticMatches, 62 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25307 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=13413, Invalid=19893, Unknown=0, NotChecked=0, Total=33306 [2019-02-18 10:06:12,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2019-02-18 10:06:12,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 247. [2019-02-18 10:06:12,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2019-02-18 10:06:12,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 247 transitions. [2019-02-18 10:06:12,863 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 247 transitions. Word has length 243 [2019-02-18 10:06:12,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:06:12,864 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 247 transitions. [2019-02-18 10:06:12,864 INFO L481 AbstractCegarLoop]: Interpolant automaton has 164 states. [2019-02-18 10:06:12,864 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 247 transitions. [2019-02-18 10:06:12,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2019-02-18 10:06:12,865 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:06:12,865 INFO L402 BasicCegarLoop]: trace histogram [82, 81, 81, 1, 1] [2019-02-18 10:06:12,865 INFO L423 AbstractCegarLoop]: === Iteration 82 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:06:12,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:06:12,865 INFO L82 PathProgramCache]: Analyzing trace with hash 1521632524, now seen corresponding path program 81 times [2019-02-18 10:06:12,865 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:06:12,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:06:12,866 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:06:12,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:06:12,866 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:06:12,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:06:16,140 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 0 proven. 9882 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:06:16,141 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:06:16,141 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:06:16,141 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:06:16,141 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:06:16,141 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:06:16,141 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:06:16,150 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:06:16,150 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:06:16,233 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:06:16,233 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:06:16,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:06:16,245 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:06:16,245 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:06:16,254 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:06:16,254 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:06:20,012 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 0 proven. 9882 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:06:20,012 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:06:24,484 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 0 proven. 9882 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:06:24,503 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:06:24,504 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82, 82] total 182 [2019-02-18 10:06:24,504 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:06:24,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 166 states [2019-02-18 10:06:24,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 166 interpolants. [2019-02-18 10:06:24,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13515, Invalid=20157, Unknown=0, NotChecked=0, Total=33672 [2019-02-18 10:06:24,507 INFO L87 Difference]: Start difference. First operand 247 states and 247 transitions. Second operand 166 states. [2019-02-18 10:06:25,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:06:25,118 INFO L93 Difference]: Finished difference Result 252 states and 252 transitions. [2019-02-18 10:06:25,118 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2019-02-18 10:06:25,118 INFO L78 Accepts]: Start accepts. Automaton has 166 states. Word has length 246 [2019-02-18 10:06:25,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:06:25,119 INFO L225 Difference]: With dead ends: 252 [2019-02-18 10:06:25,120 INFO L226 Difference]: Without dead ends: 251 [2019-02-18 10:06:25,120 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 326 SyntacticMatches, 64 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25804 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=13515, Invalid=20157, Unknown=0, NotChecked=0, Total=33672 [2019-02-18 10:06:25,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2019-02-18 10:06:25,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 250. [2019-02-18 10:06:25,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 250 states. [2019-02-18 10:06:25,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 250 transitions. [2019-02-18 10:06:25,125 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 250 transitions. Word has length 246 [2019-02-18 10:06:25,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:06:25,125 INFO L480 AbstractCegarLoop]: Abstraction has 250 states and 250 transitions. [2019-02-18 10:06:25,125 INFO L481 AbstractCegarLoop]: Interpolant automaton has 166 states. [2019-02-18 10:06:25,125 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 250 transitions. [2019-02-18 10:06:25,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2019-02-18 10:06:25,126 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:06:25,126 INFO L402 BasicCegarLoop]: trace histogram [83, 82, 82, 1, 1] [2019-02-18 10:06:25,126 INFO L423 AbstractCegarLoop]: === Iteration 83 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:06:25,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:06:25,127 INFO L82 PathProgramCache]: Analyzing trace with hash 1869722016, now seen corresponding path program 82 times [2019-02-18 10:06:25,127 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:06:25,127 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:06:25,127 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:06:25,127 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:06:25,127 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:06:25,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:06:28,538 INFO L134 CoverageAnalysis]: Checked inductivity of 10127 backedges. 0 proven. 10127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:06:28,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:06:28,539 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:06:28,539 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:06:28,539 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:06:28,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:06:28,539 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:06:28,566 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:06:28,566 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:06:28,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:06:28,642 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:06:28,644 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:06:28,644 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:06:28,653 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:06:28,653 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:06:32,804 INFO L134 CoverageAnalysis]: Checked inductivity of 10127 backedges. 0 proven. 10127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:06:32,805 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:06:37,251 INFO L134 CoverageAnalysis]: Checked inductivity of 10127 backedges. 0 proven. 10127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:06:37,270 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:06:37,270 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 183 [2019-02-18 10:06:37,271 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:06:37,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 168 states [2019-02-18 10:06:37,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 168 interpolants. [2019-02-18 10:06:37,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13617, Invalid=20423, Unknown=0, NotChecked=0, Total=34040 [2019-02-18 10:06:37,273 INFO L87 Difference]: Start difference. First operand 250 states and 250 transitions. Second operand 168 states. [2019-02-18 10:06:37,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:06:37,876 INFO L93 Difference]: Finished difference Result 255 states and 255 transitions. [2019-02-18 10:06:37,876 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2019-02-18 10:06:37,877 INFO L78 Accepts]: Start accepts. Automaton has 168 states. Word has length 249 [2019-02-18 10:06:37,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:06:37,878 INFO L225 Difference]: With dead ends: 255 [2019-02-18 10:06:37,878 INFO L226 Difference]: Without dead ends: 254 [2019-02-18 10:06:37,879 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 579 GetRequests, 330 SyntacticMatches, 66 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26301 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=13617, Invalid=20423, Unknown=0, NotChecked=0, Total=34040 [2019-02-18 10:06:37,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2019-02-18 10:06:37,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 253. [2019-02-18 10:06:37,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 253 states. [2019-02-18 10:06:37,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 253 transitions. [2019-02-18 10:06:37,883 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 253 transitions. Word has length 249 [2019-02-18 10:06:37,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:06:37,884 INFO L480 AbstractCegarLoop]: Abstraction has 253 states and 253 transitions. [2019-02-18 10:06:37,884 INFO L481 AbstractCegarLoop]: Interpolant automaton has 168 states. [2019-02-18 10:06:37,884 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 253 transitions. [2019-02-18 10:06:37,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2019-02-18 10:06:37,885 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:06:37,885 INFO L402 BasicCegarLoop]: trace histogram [84, 83, 83, 1, 1] [2019-02-18 10:06:37,886 INFO L423 AbstractCegarLoop]: === Iteration 84 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:06:37,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:06:37,886 INFO L82 PathProgramCache]: Analyzing trace with hash -542241652, now seen corresponding path program 83 times [2019-02-18 10:06:37,886 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:06:37,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:06:37,887 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:06:37,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:06:37,887 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:06:37,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:06:41,155 INFO L134 CoverageAnalysis]: Checked inductivity of 10375 backedges. 0 proven. 10375 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:06:41,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:06:41,156 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:06:41,156 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:06:41,156 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:06:41,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:06:41,156 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:06:41,164 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:06:41,164 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:06:41,612 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 84 check-sat command(s) [2019-02-18 10:06:41,612 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:06:41,621 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:06:41,623 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:06:41,624 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:06:41,636 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:06:41,636 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:06:45,592 INFO L134 CoverageAnalysis]: Checked inductivity of 10375 backedges. 0 proven. 10375 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:06:45,592 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:06:50,024 INFO L134 CoverageAnalysis]: Checked inductivity of 10375 backedges. 0 proven. 10375 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:06:50,043 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:06:50,043 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 184 [2019-02-18 10:06:50,044 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:06:50,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 170 states [2019-02-18 10:06:50,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 170 interpolants. [2019-02-18 10:06:50,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13719, Invalid=20691, Unknown=0, NotChecked=0, Total=34410 [2019-02-18 10:06:50,047 INFO L87 Difference]: Start difference. First operand 253 states and 253 transitions. Second operand 170 states. [2019-02-18 10:06:50,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:06:50,653 INFO L93 Difference]: Finished difference Result 258 states and 258 transitions. [2019-02-18 10:06:50,654 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2019-02-18 10:06:50,654 INFO L78 Accepts]: Start accepts. Automaton has 170 states. Word has length 252 [2019-02-18 10:06:50,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:06:50,656 INFO L225 Difference]: With dead ends: 258 [2019-02-18 10:06:50,656 INFO L226 Difference]: Without dead ends: 257 [2019-02-18 10:06:50,657 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 334 SyntacticMatches, 68 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26798 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=13719, Invalid=20691, Unknown=0, NotChecked=0, Total=34410 [2019-02-18 10:06:50,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2019-02-18 10:06:50,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 256. [2019-02-18 10:06:50,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2019-02-18 10:06:50,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 256 transitions. [2019-02-18 10:06:50,662 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 256 transitions. Word has length 252 [2019-02-18 10:06:50,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:06:50,662 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 256 transitions. [2019-02-18 10:06:50,662 INFO L481 AbstractCegarLoop]: Interpolant automaton has 170 states. [2019-02-18 10:06:50,662 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 256 transitions. [2019-02-18 10:06:50,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2019-02-18 10:06:50,663 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:06:50,663 INFO L402 BasicCegarLoop]: trace histogram [85, 84, 84, 1, 1] [2019-02-18 10:06:50,663 INFO L423 AbstractCegarLoop]: === Iteration 85 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:06:50,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:06:50,664 INFO L82 PathProgramCache]: Analyzing trace with hash -549012960, now seen corresponding path program 84 times [2019-02-18 10:06:50,664 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:06:50,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:06:50,664 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:06:50,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:06:50,665 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:06:50,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:06:54,355 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 0 proven. 10626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:06:54,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:06:54,356 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:06:54,356 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:06:54,356 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:06:54,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:06:54,356 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:06:54,365 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:06:54,366 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:06:54,453 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:06:54,453 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:06:54,462 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:06:54,465 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:06:54,466 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:06:54,473 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:06:54,473 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:06:58,795 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 0 proven. 10626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:06:58,795 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:07:03,108 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 0 proven. 10626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:07:03,128 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:07:03,128 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 185 [2019-02-18 10:07:03,129 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:07:03,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 172 states [2019-02-18 10:07:03,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2019-02-18 10:07:03,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13821, Invalid=20961, Unknown=0, NotChecked=0, Total=34782 [2019-02-18 10:07:03,133 INFO L87 Difference]: Start difference. First operand 256 states and 256 transitions. Second operand 172 states. [2019-02-18 10:07:03,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:07:03,837 INFO L93 Difference]: Finished difference Result 261 states and 261 transitions. [2019-02-18 10:07:03,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2019-02-18 10:07:03,838 INFO L78 Accepts]: Start accepts. Automaton has 172 states. Word has length 255 [2019-02-18 10:07:03,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:07:03,840 INFO L225 Difference]: With dead ends: 261 [2019-02-18 10:07:03,840 INFO L226 Difference]: Without dead ends: 260 [2019-02-18 10:07:03,842 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 593 GetRequests, 338 SyntacticMatches, 70 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27295 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=13821, Invalid=20961, Unknown=0, NotChecked=0, Total=34782 [2019-02-18 10:07:03,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2019-02-18 10:07:03,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 259. [2019-02-18 10:07:03,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2019-02-18 10:07:03,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 259 transitions. [2019-02-18 10:07:03,847 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 259 transitions. Word has length 255 [2019-02-18 10:07:03,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:07:03,848 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 259 transitions. [2019-02-18 10:07:03,848 INFO L481 AbstractCegarLoop]: Interpolant automaton has 172 states. [2019-02-18 10:07:03,848 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 259 transitions. [2019-02-18 10:07:03,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2019-02-18 10:07:03,850 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:07:03,850 INFO L402 BasicCegarLoop]: trace histogram [86, 85, 85, 1, 1] [2019-02-18 10:07:03,850 INFO L423 AbstractCegarLoop]: === Iteration 86 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:07:03,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:07:03,850 INFO L82 PathProgramCache]: Analyzing trace with hash -409586676, now seen corresponding path program 85 times [2019-02-18 10:07:03,850 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:07:03,851 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:07:03,851 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:07:03,851 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:07:03,851 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:07:03,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:07:07,612 INFO L134 CoverageAnalysis]: Checked inductivity of 10880 backedges. 0 proven. 10880 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:07:07,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:07:07,612 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:07:07,612 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:07:07,613 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:07:07,613 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:07:07,613 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:07:07,623 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:07:07,623 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:07:07,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:07:07,705 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:07:07,708 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:07:07,708 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:07:07,720 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:07:07,720 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:07:11,878 INFO L134 CoverageAnalysis]: Checked inductivity of 10880 backedges. 0 proven. 10880 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:07:11,879 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:07:16,254 INFO L134 CoverageAnalysis]: Checked inductivity of 10880 backedges. 0 proven. 10880 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:07:16,273 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:07:16,273 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86, 86] total 186 [2019-02-18 10:07:16,273 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:07:16,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 174 states [2019-02-18 10:07:16,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 174 interpolants. [2019-02-18 10:07:16,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13923, Invalid=21233, Unknown=0, NotChecked=0, Total=35156 [2019-02-18 10:07:16,278 INFO L87 Difference]: Start difference. First operand 259 states and 259 transitions. Second operand 174 states. [2019-02-18 10:07:17,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:07:17,026 INFO L93 Difference]: Finished difference Result 264 states and 264 transitions. [2019-02-18 10:07:17,026 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2019-02-18 10:07:17,026 INFO L78 Accepts]: Start accepts. Automaton has 174 states. Word has length 258 [2019-02-18 10:07:17,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:07:17,028 INFO L225 Difference]: With dead ends: 264 [2019-02-18 10:07:17,028 INFO L226 Difference]: Without dead ends: 263 [2019-02-18 10:07:17,029 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 600 GetRequests, 342 SyntacticMatches, 72 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27792 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=13923, Invalid=21233, Unknown=0, NotChecked=0, Total=35156 [2019-02-18 10:07:17,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2019-02-18 10:07:17,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 262. [2019-02-18 10:07:17,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2019-02-18 10:07:17,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 262 transitions. [2019-02-18 10:07:17,035 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 262 transitions. Word has length 258 [2019-02-18 10:07:17,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:07:17,036 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 262 transitions. [2019-02-18 10:07:17,036 INFO L481 AbstractCegarLoop]: Interpolant automaton has 174 states. [2019-02-18 10:07:17,036 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 262 transitions. [2019-02-18 10:07:17,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2019-02-18 10:07:17,038 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:07:17,038 INFO L402 BasicCegarLoop]: trace histogram [87, 86, 86, 1, 1] [2019-02-18 10:07:17,039 INFO L423 AbstractCegarLoop]: === Iteration 87 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:07:17,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:07:17,039 INFO L82 PathProgramCache]: Analyzing trace with hash 5464736, now seen corresponding path program 86 times [2019-02-18 10:07:17,039 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:07:17,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:07:17,040 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:07:17,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:07:17,040 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:07:17,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:07:20,623 INFO L134 CoverageAnalysis]: Checked inductivity of 11137 backedges. 0 proven. 11137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:07:20,623 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:07:20,623 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:07:20,623 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:07:20,624 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:07:20,624 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:07:20,624 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:07:20,633 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:07:20,633 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:07:21,124 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 87 check-sat command(s) [2019-02-18 10:07:21,124 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:07:21,133 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:07:21,137 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:07:21,138 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:07:21,149 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:07:21,149 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:07:25,542 INFO L134 CoverageAnalysis]: Checked inductivity of 11137 backedges. 0 proven. 11137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:07:25,542 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:07:29,993 INFO L134 CoverageAnalysis]: Checked inductivity of 11137 backedges. 0 proven. 11137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:07:30,012 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:07:30,013 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 187 [2019-02-18 10:07:30,013 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:07:30,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 176 states [2019-02-18 10:07:30,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2019-02-18 10:07:30,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14025, Invalid=21507, Unknown=0, NotChecked=0, Total=35532 [2019-02-18 10:07:30,015 INFO L87 Difference]: Start difference. First operand 262 states and 262 transitions. Second operand 176 states. [2019-02-18 10:07:30,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:07:30,765 INFO L93 Difference]: Finished difference Result 267 states and 267 transitions. [2019-02-18 10:07:30,766 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2019-02-18 10:07:30,766 INFO L78 Accepts]: Start accepts. Automaton has 176 states. Word has length 261 [2019-02-18 10:07:30,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:07:30,767 INFO L225 Difference]: With dead ends: 267 [2019-02-18 10:07:30,767 INFO L226 Difference]: Without dead ends: 266 [2019-02-18 10:07:30,768 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 607 GetRequests, 346 SyntacticMatches, 74 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28289 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=14025, Invalid=21507, Unknown=0, NotChecked=0, Total=35532 [2019-02-18 10:07:30,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2019-02-18 10:07:30,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 265. [2019-02-18 10:07:30,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 265 states. [2019-02-18 10:07:30,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 265 transitions. [2019-02-18 10:07:30,772 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 265 transitions. Word has length 261 [2019-02-18 10:07:30,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:07:30,772 INFO L480 AbstractCegarLoop]: Abstraction has 265 states and 265 transitions. [2019-02-18 10:07:30,772 INFO L481 AbstractCegarLoop]: Interpolant automaton has 176 states. [2019-02-18 10:07:30,772 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 265 transitions. [2019-02-18 10:07:30,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2019-02-18 10:07:30,773 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:07:30,774 INFO L402 BasicCegarLoop]: trace histogram [88, 87, 87, 1, 1] [2019-02-18 10:07:30,774 INFO L423 AbstractCegarLoop]: === Iteration 88 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:07:30,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:07:30,774 INFO L82 PathProgramCache]: Analyzing trace with hash -408765556, now seen corresponding path program 87 times [2019-02-18 10:07:30,774 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:07:30,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:07:30,775 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:07:30,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:07:30,775 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:07:30,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:07:34,505 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 0 proven. 11397 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:07:34,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:07:34,505 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:07:34,505 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:07:34,505 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:07:34,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:07:34,505 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:07:34,514 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:07:34,515 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:07:34,602 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:07:34,602 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:07:34,612 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:07:34,614 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:07:34,614 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:07:34,623 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:07:34,623 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:07:39,033 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 0 proven. 11397 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:07:39,033 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:07:43,494 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 0 proven. 11397 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:07:43,513 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:07:43,514 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88, 88] total 188 [2019-02-18 10:07:43,514 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:07:43,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 178 states [2019-02-18 10:07:43,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 178 interpolants. [2019-02-18 10:07:43,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14127, Invalid=21783, Unknown=0, NotChecked=0, Total=35910 [2019-02-18 10:07:43,516 INFO L87 Difference]: Start difference. First operand 265 states and 265 transitions. Second operand 178 states. [2019-02-18 10:07:44,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:07:44,147 INFO L93 Difference]: Finished difference Result 270 states and 270 transitions. [2019-02-18 10:07:44,147 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2019-02-18 10:07:44,147 INFO L78 Accepts]: Start accepts. Automaton has 178 states. Word has length 264 [2019-02-18 10:07:44,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:07:44,149 INFO L225 Difference]: With dead ends: 270 [2019-02-18 10:07:44,149 INFO L226 Difference]: Without dead ends: 269 [2019-02-18 10:07:44,151 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 614 GetRequests, 350 SyntacticMatches, 76 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28786 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=14127, Invalid=21783, Unknown=0, NotChecked=0, Total=35910 [2019-02-18 10:07:44,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2019-02-18 10:07:44,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 268. [2019-02-18 10:07:44,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2019-02-18 10:07:44,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 268 transitions. [2019-02-18 10:07:44,157 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 268 transitions. Word has length 264 [2019-02-18 10:07:44,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:07:44,157 INFO L480 AbstractCegarLoop]: Abstraction has 268 states and 268 transitions. [2019-02-18 10:07:44,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has 178 states. [2019-02-18 10:07:44,157 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 268 transitions. [2019-02-18 10:07:44,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2019-02-18 10:07:44,158 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:07:44,158 INFO L402 BasicCegarLoop]: trace histogram [89, 88, 88, 1, 1] [2019-02-18 10:07:44,158 INFO L423 AbstractCegarLoop]: === Iteration 89 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:07:44,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:07:44,159 INFO L82 PathProgramCache]: Analyzing trace with hash -1302353120, now seen corresponding path program 88 times [2019-02-18 10:07:44,159 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:07:44,159 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:07:44,159 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:07:44,159 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:07:44,159 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:07:44,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:07:47,700 INFO L134 CoverageAnalysis]: Checked inductivity of 11660 backedges. 0 proven. 11660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:07:47,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:07:47,700 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:07:47,701 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:07:47,701 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:07:47,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:07:47,701 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:07:47,708 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:07:47,709 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:07:47,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:07:47,790 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:07:47,796 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:07:47,796 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:07:47,804 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:07:47,804 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:07:52,224 INFO L134 CoverageAnalysis]: Checked inductivity of 11660 backedges. 0 proven. 11660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:07:52,224 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:07:56,581 INFO L134 CoverageAnalysis]: Checked inductivity of 11660 backedges. 0 proven. 11660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:07:56,600 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:07:56,600 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 189 [2019-02-18 10:07:56,600 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:07:56,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 180 states [2019-02-18 10:07:56,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 180 interpolants. [2019-02-18 10:07:56,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14229, Invalid=22061, Unknown=0, NotChecked=0, Total=36290 [2019-02-18 10:07:56,604 INFO L87 Difference]: Start difference. First operand 268 states and 268 transitions. Second operand 180 states. [2019-02-18 10:07:57,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:07:57,399 INFO L93 Difference]: Finished difference Result 273 states and 273 transitions. [2019-02-18 10:07:57,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2019-02-18 10:07:57,400 INFO L78 Accepts]: Start accepts. Automaton has 180 states. Word has length 267 [2019-02-18 10:07:57,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:07:57,402 INFO L225 Difference]: With dead ends: 273 [2019-02-18 10:07:57,402 INFO L226 Difference]: Without dead ends: 272 [2019-02-18 10:07:57,404 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 621 GetRequests, 354 SyntacticMatches, 78 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29283 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=14229, Invalid=22061, Unknown=0, NotChecked=0, Total=36290 [2019-02-18 10:07:57,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2019-02-18 10:07:57,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 271. [2019-02-18 10:07:57,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 271 states. [2019-02-18 10:07:57,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 271 transitions. [2019-02-18 10:07:57,408 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 271 transitions. Word has length 267 [2019-02-18 10:07:57,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:07:57,408 INFO L480 AbstractCegarLoop]: Abstraction has 271 states and 271 transitions. [2019-02-18 10:07:57,408 INFO L481 AbstractCegarLoop]: Interpolant automaton has 180 states. [2019-02-18 10:07:57,408 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 271 transitions. [2019-02-18 10:07:57,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2019-02-18 10:07:57,409 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:07:57,409 INFO L402 BasicCegarLoop]: trace histogram [90, 89, 89, 1, 1] [2019-02-18 10:07:57,410 INFO L423 AbstractCegarLoop]: === Iteration 90 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:07:57,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:07:57,410 INFO L82 PathProgramCache]: Analyzing trace with hash -1962171636, now seen corresponding path program 89 times [2019-02-18 10:07:57,410 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:07:57,410 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:07:57,410 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:07:57,410 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:07:57,411 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:07:57,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:08:01,264 INFO L134 CoverageAnalysis]: Checked inductivity of 11926 backedges. 0 proven. 11926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:08:01,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:08:01,264 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:08:01,265 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:08:01,265 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:08:01,265 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:08:01,265 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:08:01,272 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:08:01,273 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:08:01,772 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 90 check-sat command(s) [2019-02-18 10:08:01,772 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:08:01,780 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:08:01,782 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:08:01,782 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:08:01,791 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:08:01,791 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:08:06,452 INFO L134 CoverageAnalysis]: Checked inductivity of 11926 backedges. 0 proven. 11926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:08:06,452 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:08:10,859 INFO L134 CoverageAnalysis]: Checked inductivity of 11926 backedges. 0 proven. 11926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:08:10,878 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:08:10,878 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90, 90] total 190 [2019-02-18 10:08:10,878 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:08:10,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 182 states [2019-02-18 10:08:10,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 182 interpolants. [2019-02-18 10:08:10,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14331, Invalid=22341, Unknown=0, NotChecked=0, Total=36672 [2019-02-18 10:08:10,881 INFO L87 Difference]: Start difference. First operand 271 states and 271 transitions. Second operand 182 states. [2019-02-18 10:08:11,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:08:11,640 INFO L93 Difference]: Finished difference Result 276 states and 276 transitions. [2019-02-18 10:08:11,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2019-02-18 10:08:11,640 INFO L78 Accepts]: Start accepts. Automaton has 182 states. Word has length 270 [2019-02-18 10:08:11,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:08:11,642 INFO L225 Difference]: With dead ends: 276 [2019-02-18 10:08:11,642 INFO L226 Difference]: Without dead ends: 275 [2019-02-18 10:08:11,643 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 628 GetRequests, 358 SyntacticMatches, 80 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29780 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=14331, Invalid=22341, Unknown=0, NotChecked=0, Total=36672 [2019-02-18 10:08:11,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2019-02-18 10:08:11,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 274. [2019-02-18 10:08:11,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2019-02-18 10:08:11,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 274 transitions. [2019-02-18 10:08:11,649 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 274 transitions. Word has length 270 [2019-02-18 10:08:11,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:08:11,649 INFO L480 AbstractCegarLoop]: Abstraction has 274 states and 274 transitions. [2019-02-18 10:08:11,649 INFO L481 AbstractCegarLoop]: Interpolant automaton has 182 states. [2019-02-18 10:08:11,649 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 274 transitions. [2019-02-18 10:08:11,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2019-02-18 10:08:11,650 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:08:11,650 INFO L402 BasicCegarLoop]: trace histogram [91, 90, 90, 1, 1] [2019-02-18 10:08:11,650 INFO L423 AbstractCegarLoop]: === Iteration 91 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:08:11,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:08:11,651 INFO L82 PathProgramCache]: Analyzing trace with hash -550268000, now seen corresponding path program 90 times [2019-02-18 10:08:11,651 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:08:11,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:08:11,651 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:08:11,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:08:11,651 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:08:11,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:08:15,613 INFO L134 CoverageAnalysis]: Checked inductivity of 12195 backedges. 0 proven. 12195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:08:15,613 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:08:15,613 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:08:15,613 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:08:15,613 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:08:15,614 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:08:15,614 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:08:15,622 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:08:15,623 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:08:15,716 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:08:15,717 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:08:15,726 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:08:15,728 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:08:15,728 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:08:15,736 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:08:15,736 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:08:20,625 INFO L134 CoverageAnalysis]: Checked inductivity of 12195 backedges. 0 proven. 12195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:08:20,625 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:08:25,082 INFO L134 CoverageAnalysis]: Checked inductivity of 12195 backedges. 0 proven. 12195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:08:25,100 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:08:25,100 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 191 [2019-02-18 10:08:25,101 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:08:25,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 184 states [2019-02-18 10:08:25,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 184 interpolants. [2019-02-18 10:08:25,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14433, Invalid=22623, Unknown=0, NotChecked=0, Total=37056 [2019-02-18 10:08:25,104 INFO L87 Difference]: Start difference. First operand 274 states and 274 transitions. Second operand 184 states. [2019-02-18 10:08:25,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:08:25,939 INFO L93 Difference]: Finished difference Result 279 states and 279 transitions. [2019-02-18 10:08:25,940 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2019-02-18 10:08:25,940 INFO L78 Accepts]: Start accepts. Automaton has 184 states. Word has length 273 [2019-02-18 10:08:25,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:08:25,941 INFO L225 Difference]: With dead ends: 279 [2019-02-18 10:08:25,941 INFO L226 Difference]: Without dead ends: 278 [2019-02-18 10:08:25,942 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 635 GetRequests, 362 SyntacticMatches, 82 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30277 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=14433, Invalid=22623, Unknown=0, NotChecked=0, Total=37056 [2019-02-18 10:08:25,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2019-02-18 10:08:25,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 277. [2019-02-18 10:08:25,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2019-02-18 10:08:25,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 277 transitions. [2019-02-18 10:08:25,948 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 277 transitions. Word has length 273 [2019-02-18 10:08:25,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:08:25,948 INFO L480 AbstractCegarLoop]: Abstraction has 277 states and 277 transitions. [2019-02-18 10:08:25,948 INFO L481 AbstractCegarLoop]: Interpolant automaton has 184 states. [2019-02-18 10:08:25,948 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 277 transitions. [2019-02-18 10:08:25,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2019-02-18 10:08:25,949 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:08:25,949 INFO L402 BasicCegarLoop]: trace histogram [92, 91, 91, 1, 1] [2019-02-18 10:08:25,949 INFO L423 AbstractCegarLoop]: === Iteration 92 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:08:25,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:08:25,950 INFO L82 PathProgramCache]: Analyzing trace with hash 856222348, now seen corresponding path program 91 times [2019-02-18 10:08:25,950 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:08:25,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:08:25,950 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:08:25,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:08:25,950 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:08:26,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:08:30,033 INFO L134 CoverageAnalysis]: Checked inductivity of 12467 backedges. 0 proven. 12467 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:08:30,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:08:30,033 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:08:30,033 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:08:30,033 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:08:30,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:08:30,033 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:08:30,043 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:08:30,043 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:08:30,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:08:30,128 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:08:30,134 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:08:30,134 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:08:30,142 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:08:30,143 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:08:34,970 INFO L134 CoverageAnalysis]: Checked inductivity of 12467 backedges. 0 proven. 12467 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:08:34,970 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:08:39,385 INFO L134 CoverageAnalysis]: Checked inductivity of 12467 backedges. 0 proven. 12467 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:08:39,403 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:08:39,404 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92, 92] total 192 [2019-02-18 10:08:39,404 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:08:39,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 186 states [2019-02-18 10:08:39,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 186 interpolants. [2019-02-18 10:08:39,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14535, Invalid=22907, Unknown=0, NotChecked=0, Total=37442 [2019-02-18 10:08:39,407 INFO L87 Difference]: Start difference. First operand 277 states and 277 transitions. Second operand 186 states. [2019-02-18 10:08:40,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:08:40,125 INFO L93 Difference]: Finished difference Result 282 states and 282 transitions. [2019-02-18 10:08:40,126 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2019-02-18 10:08:40,126 INFO L78 Accepts]: Start accepts. Automaton has 186 states. Word has length 276 [2019-02-18 10:08:40,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:08:40,128 INFO L225 Difference]: With dead ends: 282 [2019-02-18 10:08:40,128 INFO L226 Difference]: Without dead ends: 281 [2019-02-18 10:08:40,129 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 642 GetRequests, 366 SyntacticMatches, 84 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30774 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=14535, Invalid=22907, Unknown=0, NotChecked=0, Total=37442 [2019-02-18 10:08:40,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2019-02-18 10:08:40,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 280. [2019-02-18 10:08:40,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2019-02-18 10:08:40,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 280 transitions. [2019-02-18 10:08:40,134 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 280 transitions. Word has length 276 [2019-02-18 10:08:40,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:08:40,134 INFO L480 AbstractCegarLoop]: Abstraction has 280 states and 280 transitions. [2019-02-18 10:08:40,134 INFO L481 AbstractCegarLoop]: Interpolant automaton has 186 states. [2019-02-18 10:08:40,134 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 280 transitions. [2019-02-18 10:08:40,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2019-02-18 10:08:40,135 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:08:40,135 INFO L402 BasicCegarLoop]: trace histogram [93, 92, 92, 1, 1] [2019-02-18 10:08:40,136 INFO L423 AbstractCegarLoop]: === Iteration 93 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:08:40,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:08:40,136 INFO L82 PathProgramCache]: Analyzing trace with hash -90760160, now seen corresponding path program 92 times [2019-02-18 10:08:40,136 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:08:40,136 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:08:40,136 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:08:40,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:08:40,137 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:08:40,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:08:44,659 INFO L134 CoverageAnalysis]: Checked inductivity of 12742 backedges. 0 proven. 12742 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:08:44,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:08:44,660 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:08:44,660 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:08:44,660 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:08:44,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:08:44,660 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:08:44,668 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:08:44,668 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:08:45,225 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 93 check-sat command(s) [2019-02-18 10:08:45,225 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:08:45,234 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:08:45,237 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:08:45,237 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:08:45,249 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:08:45,249 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:08:50,192 INFO L134 CoverageAnalysis]: Checked inductivity of 12742 backedges. 0 proven. 12742 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:08:50,193 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:08:54,381 INFO L134 CoverageAnalysis]: Checked inductivity of 12742 backedges. 0 proven. 12742 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:08:54,402 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:08:54,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 193 [2019-02-18 10:08:54,402 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:08:54,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 188 states [2019-02-18 10:08:54,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2019-02-18 10:08:54,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14637, Invalid=23193, Unknown=0, NotChecked=0, Total=37830 [2019-02-18 10:08:54,405 INFO L87 Difference]: Start difference. First operand 280 states and 280 transitions. Second operand 188 states. [2019-02-18 10:08:55,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:08:55,245 INFO L93 Difference]: Finished difference Result 285 states and 285 transitions. [2019-02-18 10:08:55,245 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2019-02-18 10:08:55,245 INFO L78 Accepts]: Start accepts. Automaton has 188 states. Word has length 279 [2019-02-18 10:08:55,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:08:55,247 INFO L225 Difference]: With dead ends: 285 [2019-02-18 10:08:55,247 INFO L226 Difference]: Without dead ends: 284 [2019-02-18 10:08:55,249 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 649 GetRequests, 370 SyntacticMatches, 86 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31271 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=14637, Invalid=23193, Unknown=0, NotChecked=0, Total=37830 [2019-02-18 10:08:55,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2019-02-18 10:08:55,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 283. [2019-02-18 10:08:55,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 283 states. [2019-02-18 10:08:55,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 283 transitions. [2019-02-18 10:08:55,253 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 283 transitions. Word has length 279 [2019-02-18 10:08:55,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:08:55,254 INFO L480 AbstractCegarLoop]: Abstraction has 283 states and 283 transitions. [2019-02-18 10:08:55,254 INFO L481 AbstractCegarLoop]: Interpolant automaton has 188 states. [2019-02-18 10:08:55,254 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 283 transitions. [2019-02-18 10:08:55,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 283 [2019-02-18 10:08:55,255 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:08:55,255 INFO L402 BasicCegarLoop]: trace histogram [94, 93, 93, 1, 1] [2019-02-18 10:08:55,255 INFO L423 AbstractCegarLoop]: === Iteration 94 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:08:55,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:08:55,255 INFO L82 PathProgramCache]: Analyzing trace with hash 1993511436, now seen corresponding path program 93 times [2019-02-18 10:08:55,255 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:08:55,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:08:55,256 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:08:55,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:08:55,256 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:08:55,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:08:59,199 INFO L134 CoverageAnalysis]: Checked inductivity of 13020 backedges. 0 proven. 13020 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:08:59,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:08:59,199 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:08:59,199 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:08:59,199 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:08:59,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:08:59,199 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:08:59,208 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:08:59,208 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:08:59,302 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:08:59,302 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:08:59,312 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:08:59,323 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:08:59,324 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:08:59,333 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:08:59,333 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:09:04,198 INFO L134 CoverageAnalysis]: Checked inductivity of 13020 backedges. 0 proven. 13020 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:09:04,198 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:09:08,604 INFO L134 CoverageAnalysis]: Checked inductivity of 13020 backedges. 0 proven. 13020 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:09:08,624 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:09:08,624 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94, 94] total 194 [2019-02-18 10:09:08,625 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:09:08,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 190 states [2019-02-18 10:09:08,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2019-02-18 10:09:08,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14739, Invalid=23481, Unknown=0, NotChecked=0, Total=38220 [2019-02-18 10:09:08,628 INFO L87 Difference]: Start difference. First operand 283 states and 283 transitions. Second operand 190 states. [2019-02-18 10:09:09,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:09:09,433 INFO L93 Difference]: Finished difference Result 288 states and 288 transitions. [2019-02-18 10:09:09,433 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2019-02-18 10:09:09,434 INFO L78 Accepts]: Start accepts. Automaton has 190 states. Word has length 282 [2019-02-18 10:09:09,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:09:09,436 INFO L225 Difference]: With dead ends: 288 [2019-02-18 10:09:09,436 INFO L226 Difference]: Without dead ends: 287 [2019-02-18 10:09:09,437 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 656 GetRequests, 374 SyntacticMatches, 88 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31768 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=14739, Invalid=23481, Unknown=0, NotChecked=0, Total=38220 [2019-02-18 10:09:09,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2019-02-18 10:09:09,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 286. [2019-02-18 10:09:09,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2019-02-18 10:09:09,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 286 transitions. [2019-02-18 10:09:09,442 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 286 transitions. Word has length 282 [2019-02-18 10:09:09,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:09:09,442 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 286 transitions. [2019-02-18 10:09:09,442 INFO L481 AbstractCegarLoop]: Interpolant automaton has 190 states. [2019-02-18 10:09:09,442 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 286 transitions. [2019-02-18 10:09:09,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2019-02-18 10:09:09,443 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:09:09,443 INFO L402 BasicCegarLoop]: trace histogram [95, 94, 94, 1, 1] [2019-02-18 10:09:09,443 INFO L423 AbstractCegarLoop]: === Iteration 95 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:09:09,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:09:09,443 INFO L82 PathProgramCache]: Analyzing trace with hash -2108537696, now seen corresponding path program 94 times [2019-02-18 10:09:09,444 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:09:09,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:09:09,444 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:09:09,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:09:09,444 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:09:09,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:09:13,569 INFO L134 CoverageAnalysis]: Checked inductivity of 13301 backedges. 0 proven. 13301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:09:13,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:09:13,570 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:09:13,570 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:09:13,570 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:09:13,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:09:13,570 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:09:13,579 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:09:13,579 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:09:13,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:09:13,668 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:09:13,670 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:09:13,670 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:09:13,678 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:09:13,678 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:09:18,833 INFO L134 CoverageAnalysis]: Checked inductivity of 13301 backedges. 0 proven. 13301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:09:18,833 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:09:23,311 INFO L134 CoverageAnalysis]: Checked inductivity of 13301 backedges. 0 proven. 13301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:09:23,331 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:09:23,331 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 195 [2019-02-18 10:09:23,331 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:09:23,331 INFO L459 AbstractCegarLoop]: Interpolant automaton has 192 states [2019-02-18 10:09:23,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2019-02-18 10:09:23,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14841, Invalid=23771, Unknown=0, NotChecked=0, Total=38612 [2019-02-18 10:09:23,334 INFO L87 Difference]: Start difference. First operand 286 states and 286 transitions. Second operand 192 states. [2019-02-18 10:09:24,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:09:24,032 INFO L93 Difference]: Finished difference Result 291 states and 291 transitions. [2019-02-18 10:09:24,032 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2019-02-18 10:09:24,032 INFO L78 Accepts]: Start accepts. Automaton has 192 states. Word has length 285 [2019-02-18 10:09:24,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:09:24,034 INFO L225 Difference]: With dead ends: 291 [2019-02-18 10:09:24,034 INFO L226 Difference]: Without dead ends: 290 [2019-02-18 10:09:24,036 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 663 GetRequests, 378 SyntacticMatches, 90 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32265 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=14841, Invalid=23771, Unknown=0, NotChecked=0, Total=38612 [2019-02-18 10:09:24,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2019-02-18 10:09:24,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 289. [2019-02-18 10:09:24,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2019-02-18 10:09:24,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 289 transitions. [2019-02-18 10:09:24,040 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 289 transitions. Word has length 285 [2019-02-18 10:09:24,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:09:24,041 INFO L480 AbstractCegarLoop]: Abstraction has 289 states and 289 transitions. [2019-02-18 10:09:24,041 INFO L481 AbstractCegarLoop]: Interpolant automaton has 192 states. [2019-02-18 10:09:24,041 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 289 transitions. [2019-02-18 10:09:24,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2019-02-18 10:09:24,042 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:09:24,042 INFO L402 BasicCegarLoop]: trace histogram [96, 95, 95, 1, 1] [2019-02-18 10:09:24,043 INFO L423 AbstractCegarLoop]: === Iteration 96 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:09:24,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:09:24,043 INFO L82 PathProgramCache]: Analyzing trace with hash -1549756020, now seen corresponding path program 95 times [2019-02-18 10:09:24,043 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:09:24,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:09:24,044 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:09:24,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:09:24,044 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:09:24,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:09:28,355 INFO L134 CoverageAnalysis]: Checked inductivity of 13585 backedges. 0 proven. 13585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:09:28,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:09:28,356 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:09:28,356 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:09:28,356 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:09:28,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:09:28,356 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:09:28,365 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:09:28,365 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:09:28,930 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 96 check-sat command(s) [2019-02-18 10:09:28,930 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:09:28,939 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:09:28,942 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:09:28,942 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:09:28,950 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:09:28,950 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:09:34,003 INFO L134 CoverageAnalysis]: Checked inductivity of 13585 backedges. 0 proven. 13585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:09:34,003 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:09:38,293 INFO L134 CoverageAnalysis]: Checked inductivity of 13585 backedges. 0 proven. 13585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:09:38,312 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:09:38,312 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 196 [2019-02-18 10:09:38,312 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:09:38,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 194 states [2019-02-18 10:09:38,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2019-02-18 10:09:38,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14943, Invalid=24063, Unknown=0, NotChecked=0, Total=39006 [2019-02-18 10:09:38,317 INFO L87 Difference]: Start difference. First operand 289 states and 289 transitions. Second operand 194 states. [2019-02-18 10:09:39,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:09:39,137 INFO L93 Difference]: Finished difference Result 294 states and 294 transitions. [2019-02-18 10:09:39,137 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2019-02-18 10:09:39,137 INFO L78 Accepts]: Start accepts. Automaton has 194 states. Word has length 288 [2019-02-18 10:09:39,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:09:39,139 INFO L225 Difference]: With dead ends: 294 [2019-02-18 10:09:39,139 INFO L226 Difference]: Without dead ends: 293 [2019-02-18 10:09:39,141 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 670 GetRequests, 382 SyntacticMatches, 92 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32762 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=14943, Invalid=24063, Unknown=0, NotChecked=0, Total=39006 [2019-02-18 10:09:39,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2019-02-18 10:09:39,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 292. [2019-02-18 10:09:39,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2019-02-18 10:09:39,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 292 transitions. [2019-02-18 10:09:39,146 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 292 transitions. Word has length 288 [2019-02-18 10:09:39,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:09:39,146 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 292 transitions. [2019-02-18 10:09:39,146 INFO L481 AbstractCegarLoop]: Interpolant automaton has 194 states. [2019-02-18 10:09:39,146 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 292 transitions. [2019-02-18 10:09:39,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2019-02-18 10:09:39,148 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:09:39,148 INFO L402 BasicCegarLoop]: trace histogram [97, 96, 96, 1, 1] [2019-02-18 10:09:39,148 INFO L423 AbstractCegarLoop]: === Iteration 97 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:09:39,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:09:39,149 INFO L82 PathProgramCache]: Analyzing trace with hash 2116881696, now seen corresponding path program 96 times [2019-02-18 10:09:39,149 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:09:39,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:09:39,149 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:09:39,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:09:39,149 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:09:39,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:09:43,502 INFO L134 CoverageAnalysis]: Checked inductivity of 13872 backedges. 0 proven. 13872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:09:43,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:09:43,502 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:09:43,502 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:09:43,502 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:09:43,503 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:09:43,503 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:09:43,511 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:09:43,511 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:09:43,618 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:09:43,618 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:09:43,629 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:09:43,636 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:09:43,637 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:09:43,649 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:09:43,649 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:09:48,951 INFO L134 CoverageAnalysis]: Checked inductivity of 13872 backedges. 0 proven. 13872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:09:48,951 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:09:53,058 INFO L134 CoverageAnalysis]: Checked inductivity of 13872 backedges. 0 proven. 13872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:09:53,078 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:09:53,078 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 197 [2019-02-18 10:09:53,078 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:09:53,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 196 states [2019-02-18 10:09:53,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 196 interpolants. [2019-02-18 10:09:53,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15045, Invalid=24357, Unknown=0, NotChecked=0, Total=39402 [2019-02-18 10:09:53,081 INFO L87 Difference]: Start difference. First operand 292 states and 292 transitions. Second operand 196 states. [2019-02-18 10:09:53,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:09:53,756 INFO L93 Difference]: Finished difference Result 297 states and 297 transitions. [2019-02-18 10:09:53,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2019-02-18 10:09:53,757 INFO L78 Accepts]: Start accepts. Automaton has 196 states. Word has length 291 [2019-02-18 10:09:53,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:09:53,759 INFO L225 Difference]: With dead ends: 297 [2019-02-18 10:09:53,759 INFO L226 Difference]: Without dead ends: 296 [2019-02-18 10:09:53,760 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 677 GetRequests, 386 SyntacticMatches, 94 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33259 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=15045, Invalid=24357, Unknown=0, NotChecked=0, Total=39402 [2019-02-18 10:09:53,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2019-02-18 10:09:53,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 295. [2019-02-18 10:09:53,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 295 states. [2019-02-18 10:09:53,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 295 transitions. [2019-02-18 10:09:53,765 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 295 transitions. Word has length 291 [2019-02-18 10:09:53,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:09:53,765 INFO L480 AbstractCegarLoop]: Abstraction has 295 states and 295 transitions. [2019-02-18 10:09:53,765 INFO L481 AbstractCegarLoop]: Interpolant automaton has 196 states. [2019-02-18 10:09:53,765 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 295 transitions. [2019-02-18 10:09:53,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2019-02-18 10:09:53,766 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:09:53,766 INFO L402 BasicCegarLoop]: trace histogram [98, 97, 97, 1, 1] [2019-02-18 10:09:53,766 INFO L423 AbstractCegarLoop]: === Iteration 98 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:09:53,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:09:53,767 INFO L82 PathProgramCache]: Analyzing trace with hash 1017839884, now seen corresponding path program 97 times [2019-02-18 10:09:53,767 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:09:53,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:09:53,767 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:09:53,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:09:53,767 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:09:53,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:09:58,061 INFO L134 CoverageAnalysis]: Checked inductivity of 14162 backedges. 0 proven. 14162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:09:58,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:09:58,061 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:09:58,062 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:09:58,062 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:09:58,062 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:09:58,062 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-18 10:09:58,069 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:09:58,070 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:09:58,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:09:58,158 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:09:58,161 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:09:58,161 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:09:58,170 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:09:58,170 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:10:03,583 INFO L134 CoverageAnalysis]: Checked inductivity of 14162 backedges. 0 proven. 14162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:10:03,584 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:10:08,083 INFO L134 CoverageAnalysis]: Checked inductivity of 14162 backedges. 0 proven. 14162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:10:08,104 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:10:08,104 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98, 98] total 198 [2019-02-18 10:10:08,104 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:10:08,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 198 states [2019-02-18 10:10:08,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 198 interpolants. [2019-02-18 10:10:08,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15147, Invalid=24653, Unknown=0, NotChecked=0, Total=39800 [2019-02-18 10:10:08,108 INFO L87 Difference]: Start difference. First operand 295 states and 295 transitions. Second operand 198 states. [2019-02-18 10:10:08,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:10:08,906 INFO L93 Difference]: Finished difference Result 300 states and 300 transitions. [2019-02-18 10:10:08,906 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2019-02-18 10:10:08,906 INFO L78 Accepts]: Start accepts. Automaton has 198 states. Word has length 294 [2019-02-18 10:10:08,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:10:08,907 INFO L225 Difference]: With dead ends: 300 [2019-02-18 10:10:08,907 INFO L226 Difference]: Without dead ends: 299 [2019-02-18 10:10:08,908 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 390 SyntacticMatches, 96 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33756 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=15147, Invalid=24653, Unknown=0, NotChecked=0, Total=39800 [2019-02-18 10:10:08,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2019-02-18 10:10:08,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 298. [2019-02-18 10:10:08,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2019-02-18 10:10:08,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 298 transitions. [2019-02-18 10:10:08,914 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 298 transitions. Word has length 294 [2019-02-18 10:10:08,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:10:08,914 INFO L480 AbstractCegarLoop]: Abstraction has 298 states and 298 transitions. [2019-02-18 10:10:08,914 INFO L481 AbstractCegarLoop]: Interpolant automaton has 198 states. [2019-02-18 10:10:08,914 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 298 transitions. [2019-02-18 10:10:08,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2019-02-18 10:10:08,915 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:10:08,915 INFO L402 BasicCegarLoop]: trace histogram [99, 98, 98, 1, 1] [2019-02-18 10:10:08,915 INFO L423 AbstractCegarLoop]: === Iteration 99 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:10:08,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:10:08,915 INFO L82 PathProgramCache]: Analyzing trace with hash -1084000, now seen corresponding path program 98 times [2019-02-18 10:10:08,916 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:10:08,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:10:08,916 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:10:08,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:10:08,916 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:10:08,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:10:13,433 INFO L134 CoverageAnalysis]: Checked inductivity of 14455 backedges. 0 proven. 14455 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:10:13,433 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:10:13,434 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:10:13,434 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:10:13,434 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:10:13,434 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:10:13,434 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:10:13,444 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 10:10:13,444 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 10:10:14,140 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 99 check-sat command(s) [2019-02-18 10:10:14,140 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:10:14,151 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:10:14,155 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:10:14,155 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:10:14,233 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:10:14,234 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:10:19,694 INFO L134 CoverageAnalysis]: Checked inductivity of 14455 backedges. 0 proven. 14455 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:10:19,694 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:10:23,976 INFO L134 CoverageAnalysis]: Checked inductivity of 14455 backedges. 0 proven. 14455 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:10:23,995 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:10:23,995 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 199 [2019-02-18 10:10:23,995 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:10:23,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 200 states [2019-02-18 10:10:23,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 200 interpolants. [2019-02-18 10:10:23,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15249, Invalid=24951, Unknown=0, NotChecked=0, Total=40200 [2019-02-18 10:10:23,999 INFO L87 Difference]: Start difference. First operand 298 states and 298 transitions. Second operand 200 states. [2019-02-18 10:10:24,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:10:24,882 INFO L93 Difference]: Finished difference Result 303 states and 303 transitions. [2019-02-18 10:10:24,882 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2019-02-18 10:10:24,882 INFO L78 Accepts]: Start accepts. Automaton has 200 states. Word has length 297 [2019-02-18 10:10:24,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:10:24,884 INFO L225 Difference]: With dead ends: 303 [2019-02-18 10:10:24,884 INFO L226 Difference]: Without dead ends: 302 [2019-02-18 10:10:24,886 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 691 GetRequests, 394 SyntacticMatches, 98 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34253 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=15249, Invalid=24951, Unknown=0, NotChecked=0, Total=40200 [2019-02-18 10:10:24,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2019-02-18 10:10:24,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 301. [2019-02-18 10:10:24,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 301 states. [2019-02-18 10:10:24,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 301 transitions. [2019-02-18 10:10:24,891 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 301 transitions. Word has length 297 [2019-02-18 10:10:24,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:10:24,891 INFO L480 AbstractCegarLoop]: Abstraction has 301 states and 301 transitions. [2019-02-18 10:10:24,891 INFO L481 AbstractCegarLoop]: Interpolant automaton has 200 states. [2019-02-18 10:10:24,891 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 301 transitions. [2019-02-18 10:10:24,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2019-02-18 10:10:24,893 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:10:24,893 INFO L402 BasicCegarLoop]: trace histogram [100, 99, 99, 1, 1] [2019-02-18 10:10:24,893 INFO L423 AbstractCegarLoop]: === Iteration 100 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:10:24,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:10:24,893 INFO L82 PathProgramCache]: Analyzing trace with hash 2066335884, now seen corresponding path program 99 times [2019-02-18 10:10:24,894 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:10:24,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:10:24,894 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:10:24,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:10:24,894 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:10:24,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:10:29,341 INFO L134 CoverageAnalysis]: Checked inductivity of 14751 backedges. 0 proven. 14751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:10:29,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:10:29,341 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:10:29,342 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:10:29,342 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:10:29,342 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:10:29,342 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:10:29,349 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 10:10:29,350 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 10:10:29,474 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 10:10:29,474 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 10:10:29,487 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:10:29,503 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-02-18 10:10:29,504 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 10:10:29,533 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 10:10:29,533 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 10:10:34,959 INFO L134 CoverageAnalysis]: Checked inductivity of 14751 backedges. 0 proven. 14751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:10:34,959 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:10:39,001 INFO L134 CoverageAnalysis]: Checked inductivity of 14751 backedges. 0 proven. 14751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:10:39,020 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 10:10:39,020 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100, 100] total 200 [2019-02-18 10:10:39,020 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 10:10:39,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 202 states [2019-02-18 10:10:39,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 202 interpolants. [2019-02-18 10:10:39,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15351, Invalid=25251, Unknown=0, NotChecked=0, Total=40602 [2019-02-18 10:10:39,023 INFO L87 Difference]: Start difference. First operand 301 states and 301 transitions. Second operand 202 states. [2019-02-18 10:10:39,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:10:39,809 INFO L93 Difference]: Finished difference Result 306 states and 306 transitions. [2019-02-18 10:10:39,809 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2019-02-18 10:10:39,809 INFO L78 Accepts]: Start accepts. Automaton has 202 states. Word has length 300 [2019-02-18 10:10:39,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:10:39,810 INFO L225 Difference]: With dead ends: 306 [2019-02-18 10:10:39,810 INFO L226 Difference]: Without dead ends: 305 [2019-02-18 10:10:39,812 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 399 SyntacticMatches, 99 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34551 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=15351, Invalid=25251, Unknown=0, NotChecked=0, Total=40602 [2019-02-18 10:10:39,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2019-02-18 10:10:39,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 304. [2019-02-18 10:10:39,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2019-02-18 10:10:39,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 304 transitions. [2019-02-18 10:10:39,817 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 304 transitions. Word has length 300 [2019-02-18 10:10:39,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:10:39,817 INFO L480 AbstractCegarLoop]: Abstraction has 304 states and 304 transitions. [2019-02-18 10:10:39,817 INFO L481 AbstractCegarLoop]: Interpolant automaton has 202 states. [2019-02-18 10:10:39,817 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 304 transitions. [2019-02-18 10:10:39,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 304 [2019-02-18 10:10:39,819 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 10:10:39,819 INFO L402 BasicCegarLoop]: trace histogram [101, 100, 100, 1, 1] [2019-02-18 10:10:39,819 INFO L423 AbstractCegarLoop]: === Iteration 101 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 10:10:39,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 10:10:39,819 INFO L82 PathProgramCache]: Analyzing trace with hash -1553891808, now seen corresponding path program 100 times [2019-02-18 10:10:39,819 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 10:10:39,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:10:39,820 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 10:10:39,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 10:10:39,820 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 10:10:39,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:10:44,275 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 14752 proven. 298 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:10:44,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:10:44,275 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 10:10:44,275 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 10:10:44,275 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 10:10:44,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 10:10:44,276 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 10:10:44,284 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 10:10:44,284 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 10:10:44,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 10:10:44,369 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 10:10:44,482 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 15050 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:10:44,483 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 10:10:48,390 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 15050 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 10:10:48,408 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-02-18 10:10:48,409 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [102, 102] imperfect sequences [102] total 103 [2019-02-18 10:10:48,409 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-02-18 10:10:48,409 INFO L459 AbstractCegarLoop]: Interpolant automaton has 103 states [2019-02-18 10:10:48,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2019-02-18 10:10:48,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5256, Invalid=5456, Unknown=0, NotChecked=0, Total=10712 [2019-02-18 10:10:48,410 INFO L87 Difference]: Start difference. First operand 304 states and 304 transitions. Second operand 103 states. [2019-02-18 10:10:49,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 10:10:49,164 INFO L93 Difference]: Finished difference Result 306 states and 306 transitions. [2019-02-18 10:10:49,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2019-02-18 10:10:49,164 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 303 [2019-02-18 10:10:49,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 10:10:49,165 INFO L225 Difference]: With dead ends: 306 [2019-02-18 10:10:49,165 INFO L226 Difference]: Without dead ends: 0 [2019-02-18 10:10:49,167 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 706 GetRequests, 504 SyntacticMatches, 100 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5544 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=5256, Invalid=5456, Unknown=0, NotChecked=0, Total=10712 [2019-02-18 10:10:49,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-02-18 10:10:49,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-02-18 10:10:49,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-02-18 10:10:49,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-02-18 10:10:49,168 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 303 [2019-02-18 10:10:49,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 10:10:49,168 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-02-18 10:10:49,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has 103 states. [2019-02-18 10:10:49,169 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-02-18 10:10:49,169 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-02-18 10:10:49,174 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2019-02-18 10:10:49,305 WARN L181 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 511 [2019-02-18 10:10:52,165 WARN L181 SmtUtils]: Spent 2.86 s on a formula simplification. DAG size of input: 511 DAG size of output: 509 [2019-02-18 10:10:52,174 INFO L448 ceAbstractionStarter]: For program point mainENTRY(lines 2 23) no Hoare annotation was computed. [2019-02-18 10:10:52,174 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONASSERT(line 15) no Hoare annotation was computed. [2019-02-18 10:10:52,174 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 2 23) no Hoare annotation was computed. [2019-02-18 10:10:52,174 INFO L448 ceAbstractionStarter]: For program point L15(line 15) no Hoare annotation was computed. [2019-02-18 10:10:52,174 INFO L448 ceAbstractionStarter]: For program point L14(lines 14 19) no Hoare annotation was computed. [2019-02-18 10:10:52,176 INFO L444 ceAbstractionStarter]: At program point L12-1(lines 12 21) the Hoare annotation is: (let ((.cse0 (<= 400 (select |#length| main_q.base)))) (or (and (<= main_q.offset 112) (<= (+ main_p.offset 112) main_q.offset) .cse0) (and (<= main_q.offset 260) (<= (+ main_p.offset 260) main_q.offset) .cse0) (and (<= (+ main_p.offset 128) main_q.offset) (<= main_q.offset 128) .cse0) (and (<= (+ main_p.offset 196) main_q.offset) (<= main_q.offset 196) .cse0) (and (<= main_q.offset 124) (<= (+ main_p.offset 124) main_q.offset) .cse0) (and (<= (+ main_p.offset 308) main_q.offset) (<= main_q.offset 308) .cse0) (and (<= main_q.offset 240) (<= (+ main_p.offset 240) main_q.offset) .cse0) (and (<= main_q.offset 332) (<= (+ main_p.offset 332) main_q.offset) .cse0) (and (<= (+ main_p.offset 296) main_q.offset) (<= main_q.offset 296) .cse0) (and (<= (+ main_p.offset 268) main_q.offset) (<= main_q.offset 268) .cse0) (and (<= main_q.offset 160) (<= (+ main_p.offset 160) main_q.offset) .cse0) (and (<= main_q.offset 180) (<= (+ main_p.offset 180) main_q.offset) .cse0) (and (<= (+ main_p.offset 368) main_q.offset) (<= main_q.offset 368) .cse0) (and (<= main_q.offset 384) (<= (+ main_p.offset 384) main_q.offset) .cse0) (and (<= main_q.offset 392) (<= (+ main_p.offset 392) main_q.offset) .cse0) (and (<= main_q.offset 144) .cse0 (<= (+ main_p.offset 144) main_q.offset)) (and (<= main_q.offset 200) (<= (+ main_p.offset 200) main_q.offset) .cse0) (and (<= (+ main_p.offset 288) main_q.offset) (<= main_q.offset 288) .cse0) (and (<= main_q.offset 340) (<= (+ main_p.offset 340) main_q.offset) .cse0) (and (<= main_q.offset 356) (<= (+ main_p.offset 356) main_q.offset) .cse0) (and (<= (+ main_p.offset 276) main_q.offset) (<= main_q.offset 276) .cse0) (and (<= main_q.offset 336) (<= (+ main_p.offset 336) main_q.offset) .cse0) (and (<= (+ main_p.offset 140) main_q.offset) (<= main_q.offset 140) .cse0) (and (<= main_q.offset 244) (<= (+ main_p.offset 244) main_q.offset) .cse0) (and (<= (+ main_p.offset 396) main_q.offset) (<= main_q.offset 396) .cse0) (and (<= (+ main_p.offset 312) main_q.offset) (<= main_q.offset 312) .cse0) (and (<= main_q.offset 148) (<= (+ main_p.offset 148) main_q.offset) .cse0) (and (<= (+ main_p.offset 352) main_q.offset) (<= main_q.offset 352) .cse0) (and (<= main_q.offset 344) (<= (+ main_p.offset 344) main_q.offset) .cse0) (and (<= main_q.offset 164) (<= (+ main_p.offset 164) main_q.offset) .cse0) (and (<= (+ main_p.offset 304) main_q.offset) (<= main_q.offset 304) .cse0) (and (<= main_q.offset 320) (<= (+ main_p.offset 320) main_q.offset) .cse0) (and (<= (+ main_p.offset 36) main_q.offset) (<= main_q.offset 36) .cse0) (and (<= (+ main_p.offset 44) main_q.offset) (<= main_q.offset 44) .cse0) (and (<= (+ main_p.offset 228) main_q.offset) (<= main_q.offset 228) .cse0) (and (<= main_p.offset main_q.offset) (<= main_q.offset 0) .cse0) (and (<= (+ main_p.offset 284) main_q.offset) (<= main_q.offset 284) .cse0) (and (<= (+ main_p.offset 188) main_q.offset) (<= main_q.offset 188) .cse0) (and (<= (+ main_p.offset 8) main_q.offset) (<= main_q.offset 8) .cse0) (and (<= main_q.offset 348) .cse0 (<= (+ main_p.offset 348) main_q.offset)) (<= (+ main_p.offset 400) main_q.offset) (and (<= (+ main_p.offset 224) main_q.offset) (<= main_q.offset 224) .cse0) (and (<= (+ main_p.offset 120) main_q.offset) (<= main_q.offset 120) .cse0) (and (<= main_q.offset 232) (<= (+ main_p.offset 232) main_q.offset) .cse0) (and (<= main_q.offset 92) (<= (+ main_p.offset 92) main_q.offset) .cse0) (and (<= main_q.offset 236) (<= (+ main_p.offset 236) main_q.offset) .cse0) (and (<= (+ main_p.offset 328) main_q.offset) (<= main_q.offset 328) .cse0) (and (<= main_q.offset 12) (<= (+ main_p.offset 12) main_q.offset) .cse0) (and (<= (+ main_p.offset 64) main_q.offset) (<= main_q.offset 64) .cse0) (and (<= (+ main_p.offset 192) main_q.offset) (<= main_q.offset 192) .cse0) (and (<= (+ main_p.offset 104) main_q.offset) (<= main_q.offset 104) .cse0) (and (<= main_q.offset 280) (<= (+ main_p.offset 280) main_q.offset) .cse0) (and (<= (+ main_p.offset 316) main_q.offset) (<= main_q.offset 316) .cse0) (and (<= main_q.offset 152) (<= (+ main_p.offset 152) main_q.offset) .cse0) (and (<= (+ main_p.offset 248) main_q.offset) (<= main_q.offset 248) .cse0) (and (<= main_q.offset 28) (<= (+ main_p.offset 28) main_q.offset) .cse0) (and (<= (+ main_p.offset 68) main_q.offset) (<= main_q.offset 68) .cse0) (and (<= main_q.offset 4) .cse0 (<= (+ main_p.offset 4) main_q.offset)) (and (<= (+ main_p.offset 204) main_q.offset) (<= main_q.offset 204) .cse0) (and (<= main_q.offset 380) (<= (+ main_p.offset 380) main_q.offset) .cse0) (and (<= main_q.offset 52) (<= (+ main_p.offset 52) main_q.offset) .cse0) (and (<= (+ main_p.offset 172) main_q.offset) (<= main_q.offset 172) .cse0) (and (<= main_q.offset 56) (<= (+ main_p.offset 56) main_q.offset) .cse0) (and (<= main_q.offset 60) (<= (+ main_p.offset 60) main_q.offset) .cse0) (and (<= main_q.offset 100) (<= (+ main_p.offset 100) main_q.offset) .cse0) (and (<= main_q.offset 208) (<= (+ main_p.offset 208) main_q.offset) .cse0) (and (<= (+ main_p.offset 220) main_q.offset) (<= main_q.offset 220) .cse0) (and (<= (+ main_p.offset 132) main_q.offset) (<= main_q.offset 132) .cse0) (and (<= main_q.offset 176) (<= (+ main_p.offset 176) main_q.offset) .cse0) (and (<= main_q.offset 116) (<= (+ main_p.offset 116) main_q.offset) .cse0) (and (<= (+ main_p.offset 136) main_q.offset) (<= main_q.offset 136) .cse0) (and (<= main_q.offset 184) (<= (+ main_p.offset 184) main_q.offset) .cse0) (and (<= main_q.offset 20) (<= (+ main_p.offset 20) main_q.offset) .cse0) (and (<= (+ main_p.offset 216) main_q.offset) (<= main_q.offset 216) .cse0) (and (<= (+ main_p.offset 376) main_q.offset) (<= main_q.offset 376) .cse0) (and (<= (+ main_p.offset 324) main_q.offset) (<= main_q.offset 324) .cse0) (and (<= (+ main_p.offset 72) main_q.offset) (<= main_q.offset 72) .cse0) (and (<= main_q.offset 76) (<= (+ main_p.offset 76) main_q.offset) .cse0) (and (<= main_q.offset 16) (<= (+ main_p.offset 16) main_q.offset) .cse0) (and (<= main_q.offset 84) (<= (+ main_p.offset 84) main_q.offset) .cse0) (and (<= (+ main_p.offset 364) main_q.offset) (<= main_q.offset 364) .cse0) (and (<= (+ main_p.offset 156) main_q.offset) (<= main_q.offset 156) .cse0) (and (<= (+ main_p.offset 88) main_q.offset) .cse0 (<= main_q.offset 88)) (and (<= main_q.offset 168) (<= (+ main_p.offset 168) main_q.offset) .cse0) (and (<= (+ main_p.offset 48) main_q.offset) (<= main_q.offset 48) .cse0) (and (<= main_q.offset 252) (<= (+ main_p.offset 252) main_q.offset) .cse0) (and (<= (+ main_p.offset 264) main_q.offset) (<= main_q.offset 264) .cse0) (and (<= (+ main_p.offset 388) main_q.offset) (<= main_q.offset 388) .cse0) (and (<= main_q.offset 256) (<= (+ main_p.offset 256) main_q.offset) .cse0) (and (<= (+ main_p.offset 40) main_q.offset) (<= main_q.offset 40) .cse0) (and (<= main_q.offset 300) .cse0 (<= (+ main_p.offset 300) main_q.offset)) (and (<= (+ main_p.offset 80) main_q.offset) (<= main_q.offset 80) .cse0) (and (<= main_q.offset 108) .cse0 (<= (+ main_p.offset 108) main_q.offset)) (and (<= main_q.offset 212) (<= (+ main_p.offset 212) main_q.offset) .cse0) (and (<= main_q.offset 372) (<= (+ main_p.offset 372) main_q.offset) .cse0) (and (<= (+ main_p.offset 96) main_q.offset) .cse0 (<= main_q.offset 96)) (and (<= (+ main_p.offset 272) main_q.offset) (<= main_q.offset 272) .cse0) (and (<= main_q.offset 292) (<= (+ main_p.offset 292) main_q.offset) .cse0) (and (<= (+ main_p.offset 360) main_q.offset) (<= main_q.offset 360) .cse0) (and (<= main_q.offset 32) (<= (+ main_p.offset 32) main_q.offset) .cse0) (and (<= (+ main_p.offset 24) main_q.offset) (<= main_q.offset 24) .cse0))) [2019-02-18 10:10:52,177 INFO L448 ceAbstractionStarter]: For program point L12-2(lines 2 23) no Hoare annotation was computed. [2019-02-18 10:10:52,217 INFO L202 PluginConnector]: Adding new model PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.02 10:10:52 BoogieIcfgContainer [2019-02-18 10:10:52,218 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-02-18 10:10:52,218 INFO L168 Benchmark]: Toolchain (without parser) took 744706.55 ms. Allocated memory was 138.9 MB in the beginning and 2.6 GB in the end (delta: 2.4 GB). Free memory was 106.2 MB in the beginning and 430.8 MB in the end (delta: -324.6 MB). Peak memory consumption was 2.1 GB. Max. memory is 7.1 GB. [2019-02-18 10:10:52,219 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.22 ms. Allocated memory is still 138.9 MB. Free memory is still 107.6 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-02-18 10:10:52,219 INFO L168 Benchmark]: Boogie Procedure Inliner took 59.97 ms. Allocated memory is still 138.9 MB. Free memory was 106.2 MB in the beginning and 103.9 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.2 MB. Max. memory is 7.1 GB. [2019-02-18 10:10:52,219 INFO L168 Benchmark]: Boogie Preprocessor took 26.46 ms. Allocated memory is still 138.9 MB. Free memory was 103.9 MB in the beginning and 102.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2019-02-18 10:10:52,220 INFO L168 Benchmark]: RCFGBuilder took 295.79 ms. Allocated memory is still 138.9 MB. Free memory was 102.7 MB in the beginning and 92.7 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2019-02-18 10:10:52,220 INFO L168 Benchmark]: TraceAbstraction took 744320.00 ms. Allocated memory was 138.9 MB in the beginning and 2.6 GB in the end (delta: 2.4 GB). Free memory was 92.5 MB in the beginning and 430.8 MB in the end (delta: -338.3 MB). Peak memory consumption was 2.1 GB. Max. memory is 7.1 GB. [2019-02-18 10:10:52,222 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.22 ms. Allocated memory is still 138.9 MB. Free memory is still 107.6 MB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 59.97 ms. Allocated memory is still 138.9 MB. Free memory was 106.2 MB in the beginning and 103.9 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.46 ms. Allocated memory is still 138.9 MB. Free memory was 103.9 MB in the beginning and 102.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 295.79 ms. Allocated memory is still 138.9 MB. Free memory was 102.7 MB in the beginning and 92.7 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 744320.00 ms. Allocated memory was 138.9 MB in the beginning and 2.6 GB in the end (delta: 2.4 GB). Free memory was 92.5 MB in the beginning and 430.8 MB in the end (delta: -338.3 MB). Peak memory consumption was 2.1 GB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 15]: assertion always holds For all program executions holds that assertion always holds at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 12]: Loop Invariant Derived loop invariant: (((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((q!offset <= 112 && p!offset + 112 <= q!offset) && 400 <= #length[q!base]) || ((q!offset <= 260 && p!offset + 260 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 128 <= q!offset && q!offset <= 128) && 400 <= #length[q!base])) || ((p!offset + 196 <= q!offset && q!offset <= 196) && 400 <= #length[q!base])) || ((q!offset <= 124 && p!offset + 124 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 308 <= q!offset && q!offset <= 308) && 400 <= #length[q!base])) || ((q!offset <= 240 && p!offset + 240 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 332 && p!offset + 332 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 296 <= q!offset && q!offset <= 296) && 400 <= #length[q!base])) || ((p!offset + 268 <= q!offset && q!offset <= 268) && 400 <= #length[q!base])) || ((q!offset <= 160 && p!offset + 160 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 180 && p!offset + 180 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 368 <= q!offset && q!offset <= 368) && 400 <= #length[q!base])) || ((q!offset <= 384 && p!offset + 384 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 392 && p!offset + 392 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 144 && 400 <= #length[q!base]) && p!offset + 144 <= q!offset)) || ((q!offset <= 200 && p!offset + 200 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 288 <= q!offset && q!offset <= 288) && 400 <= #length[q!base])) || ((q!offset <= 340 && p!offset + 340 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 356 && p!offset + 356 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 276 <= q!offset && q!offset <= 276) && 400 <= #length[q!base])) || ((q!offset <= 336 && p!offset + 336 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 140 <= q!offset && q!offset <= 140) && 400 <= #length[q!base])) || ((q!offset <= 244 && p!offset + 244 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 396 <= q!offset && q!offset <= 396) && 400 <= #length[q!base])) || ((p!offset + 312 <= q!offset && q!offset <= 312) && 400 <= #length[q!base])) || ((q!offset <= 148 && p!offset + 148 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 352 <= q!offset && q!offset <= 352) && 400 <= #length[q!base])) || ((q!offset <= 344 && p!offset + 344 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 164 && p!offset + 164 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 304 <= q!offset && q!offset <= 304) && 400 <= #length[q!base])) || ((q!offset <= 320 && p!offset + 320 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 36 <= q!offset && q!offset <= 36) && 400 <= #length[q!base])) || ((p!offset + 44 <= q!offset && q!offset <= 44) && 400 <= #length[q!base])) || ((p!offset + 228 <= q!offset && q!offset <= 228) && 400 <= #length[q!base])) || ((p!offset <= 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q!offset <= 264) && 400 <= #length[q!base])) || ((p!offset + 388 <= q!offset && q!offset <= 388) && 400 <= #length[q!base])) || ((q!offset <= 256 && p!offset + 256 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 40 <= q!offset && q!offset <= 40) && 400 <= #length[q!base])) || ((q!offset <= 300 && 400 <= #length[q!base]) && p!offset + 300 <= q!offset)) || ((p!offset + 80 <= q!offset && q!offset <= 80) && 400 <= #length[q!base])) || ((q!offset <= 108 && 400 <= #length[q!base]) && p!offset + 108 <= q!offset)) || ((q!offset <= 212 && p!offset + 212 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 372 && p!offset + 372 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 96 <= q!offset && 400 <= #length[q!base]) && q!offset <= 96)) || ((p!offset + 272 <= q!offset && q!offset <= 272) && 400 <= #length[q!base])) || ((q!offset <= 292 && p!offset + 292 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 360 <= q!offset && q!offset <= 360) && 400 <= #length[q!base])) || ((q!offset <= 32 && p!offset + 32 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 24 <= q!offset && q!offset <= 24) && 400 <= #length[q!base]) - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 7 locations, 1 error locations. SAFE Result, 744.2s OverallTime, 101 OverallIterations, 101 TraceHistogramMax, 42.5s AutomataDifference, 0.0s DeadEndRemovalTime, 3.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 202 SDtfs, 7321 SDslu, 1 SDs, 0 SdLazy, 27597 SolverSat, 353 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 26.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 35852 GetRequests, 20503 SyntacticMatches, 2649 SemanticMatches, 12700 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1303168 ImplicationChecksByTransitivity, 642.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=304occurred in iteration=100, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 9.5s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.4s AutomataMinimizationTime, 101 MinimizatonAttempts, 100 StatesRemovedByMinimization, 100 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 1 LocationsWithAnnotation, 1 PreInvPairs, 102 NumberOfFragments, 1404 HoareAnnotationTreeSize, 1 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 1 FomulaSimplificationsInter, 7 FormulaSimplificationTreeSizeReductionInter, 2.8s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.7s SsaConstructionTime, 13.1s SatisfiabilityAnalysisTime, 666.7s InterpolantComputationTime, 30903 NumberOfCodeBlocks, 30903 NumberOfCodeBlocksAsserted, 1884 NumberOfCheckSat, 46052 ConstructedInterpolants, 0 QuantifiedInterpolants, 70702786 SizeOfPredicates, 596 NumberOfNonLiveVariables, 32500 ConjunctsInSsa, 15942 ConjunctsInUnsatCore, 301 InterpolantComputations, 3 PerfectInterpolantSequences, 44852/1530150 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...