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_compound_exp_cong.epf -i ../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/PointerIncrement-simplified02.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-a9d37a5-m [2019-02-28 10:10:27,302 INFO L170 SettingsManager]: Resetting all preferences to default values... [2019-02-28 10:10:27,304 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2019-02-28 10:10:27,320 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-02-28 10:10:27,321 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-02-28 10:10:27,323 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-02-28 10:10:27,324 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-02-28 10:10:27,326 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2019-02-28 10:10:27,328 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-02-28 10:10:27,329 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-02-28 10:10:27,330 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2019-02-28 10:10:27,367 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_compound_exp_cong.epf [2019-02-28 10:10:27,390 INFO L110 SettingsManager]: Loading preferences was successful [2019-02-28 10:10:27,390 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2019-02-28 10:10:27,392 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2019-02-28 10:10:27,392 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2019-02-28 10:10:27,392 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-02-28 10:10:27,393 INFO L133 SettingsManager]: * User list type=DISABLED [2019-02-28 10:10:27,393 INFO L133 SettingsManager]: * Inline calls to unimplemented procedures=true [2019-02-28 10:10:27,393 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-02-28 10:10:27,393 INFO L133 SettingsManager]: * Explicit value domain=true [2019-02-28 10:10:27,393 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-02-28 10:10:27,393 INFO L133 SettingsManager]: * Octagon Domain=false [2019-02-28 10:10:27,394 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2019-02-28 10:10:27,394 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-02-28 10:10:27,395 INFO L133 SettingsManager]: * Interval Domain=false [2019-02-28 10:10:27,395 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-02-28 10:10:27,396 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2019-02-28 10:10:27,397 INFO L133 SettingsManager]: * Use SBE=true [2019-02-28 10:10:27,398 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-02-28 10:10:27,399 INFO L133 SettingsManager]: * sizeof long=4 [2019-02-28 10:10:27,399 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2019-02-28 10:10:27,399 INFO L133 SettingsManager]: * sizeof POINTER=4 [2019-02-28 10:10:27,399 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2019-02-28 10:10:27,400 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-02-28 10:10:27,400 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-02-28 10:10:27,400 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-02-28 10:10:27,400 INFO L133 SettingsManager]: * sizeof long double=12 [2019-02-28 10:10:27,401 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2019-02-28 10:10:27,401 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-02-28 10:10:27,401 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-02-28 10:10:27,401 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-02-28 10:10:27,401 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2019-02-28 10:10:27,401 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:16092 -smt2 -in -t:200000 [2019-02-28 10:10:27,402 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-02-28 10:10:27,402 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-02-28 10:10:27,402 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-02-28 10:10:27,402 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-02-28 10:10:27,402 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-02-28 10:10:27,403 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:16092 -smt2 -in [2019-02-28 10:10:27,403 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-02-28 10:10:27,403 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-02-28 10:10:27,441 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-02-28 10:10:27,461 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-02-28 10:10:27,465 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-02-28 10:10:27,467 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2019-02-28 10:10:27,467 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2019-02-28 10:10:27,468 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/PointerIncrement-simplified02.bpl [2019-02-28 10:10:27,468 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/PointerIncrement-simplified02.bpl' [2019-02-28 10:10:27,502 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-02-28 10:10:27,504 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-02-28 10:10:27,505 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-02-28 10:10:27,505 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-02-28 10:10:27,505 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2019-02-28 10:10:27,521 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "PointerIncrement-simplified02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:10:27" (1/1) ... [2019-02-28 10:10:27,534 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "PointerIncrement-simplified02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:10:27" (1/1) ... [2019-02-28 10:10:27,540 WARN L165 Inliner]: Program contained no entry procedure! [2019-02-28 10:10:27,541 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2019-02-28 10:10:27,541 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2019-02-28 10:10:27,556 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-02-28 10:10:27,557 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-02-28 10:10:27,557 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-02-28 10:10:27,558 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2019-02-28 10:10:27,569 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "PointerIncrement-simplified02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:10:27" (1/1) ... [2019-02-28 10:10:27,569 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "PointerIncrement-simplified02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:10:27" (1/1) ... [2019-02-28 10:10:27,570 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "PointerIncrement-simplified02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:10:27" (1/1) ... [2019-02-28 10:10:27,571 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "PointerIncrement-simplified02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:10:27" (1/1) ... [2019-02-28 10:10:27,574 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "PointerIncrement-simplified02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:10:27" (1/1) ... [2019-02-28 10:10:27,578 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "PointerIncrement-simplified02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:10:27" (1/1) ... [2019-02-28 10:10:27,580 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "PointerIncrement-simplified02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:10:27" (1/1) ... [2019-02-28 10:10:27,581 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-02-28 10:10:27,582 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-02-28 10:10:27,582 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-02-28 10:10:27,582 INFO L276 PluginConnector]: RCFGBuilder initialized [2019-02-28 10:10:27,583 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "PointerIncrement-simplified02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:10:27" (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:16092 -smt2 -in -t:200000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:16092 -smt2 -in -t:200000 [2019-02-28 10:10:27,658 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-02-28 10:10:27,659 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-02-28 10:10:27,659 INFO L130 BoogieDeclarations]: Found specification of procedure ~malloc [2019-02-28 10:10:27,898 INFO L278 CfgBuilder]: Using library mode [2019-02-28 10:10:27,898 INFO L286 CfgBuilder]: Removed 3 assue(true) statements. [2019-02-28 10:10:27,899 INFO L202 PluginConnector]: Adding new model PointerIncrement-simplified02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.02 10:10:27 BoogieIcfgContainer [2019-02-28 10:10:27,900 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-02-28 10:10:27,901 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-02-28 10:10:27,901 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-02-28 10:10:27,904 INFO L276 PluginConnector]: TraceAbstraction initialized [2019-02-28 10:10:27,904 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "PointerIncrement-simplified02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:10:27" (1/2) ... [2019-02-28 10:10:27,905 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@153661f and model type PointerIncrement-simplified02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.02 10:10:27, skipping insertion in model container [2019-02-28 10:10:27,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "PointerIncrement-simplified02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.02 10:10:27" (2/2) ... [2019-02-28 10:10:27,908 INFO L112 eAbstractionObserver]: Analyzing ICFG PointerIncrement-simplified02.bpl [2019-02-28 10:10:27,918 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-02-28 10:10:27,926 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-02-28 10:10:27,954 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-02-28 10:10:28,035 INFO L382 AbstractCegarLoop]: Interprodecural is true [2019-02-28 10:10:28,035 INFO L383 AbstractCegarLoop]: Hoare is true [2019-02-28 10:10:28,036 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-02-28 10:10:28,036 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-02-28 10:10:28,036 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-02-28 10:10:28,036 INFO L387 AbstractCegarLoop]: Difference is false [2019-02-28 10:10:28,036 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-02-28 10:10:28,036 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-02-28 10:10:28,072 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states. [2019-02-28 10:10:28,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2019-02-28 10:10:28,087 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:28,088 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2019-02-28 10:10:28,097 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:28,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:28,107 INFO L82 PathProgramCache]: Analyzing trace with hash 927590, now seen corresponding path program 1 times [2019-02-28 10:10:28,113 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:28,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:28,165 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:28,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:28,165 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:28,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:28,306 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:28,308 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-02-28 10:10:28,308 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2019-02-28 10:10:28,308 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-02-28 10:10:28,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-02-28 10:10:28,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-02-28 10:10:28,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-02-28 10:10:28,330 INFO L87 Difference]: Start difference. First operand 8 states. Second operand 3 states. [2019-02-28 10:10:28,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:28,384 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2019-02-28 10:10:28,385 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-02-28 10:10:28,386 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2019-02-28 10:10:28,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:28,398 INFO L225 Difference]: With dead ends: 17 [2019-02-28 10:10:28,398 INFO L226 Difference]: Without dead ends: 10 [2019-02-28 10:10:28,402 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 [2019-02-28 10:10:28,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2019-02-28 10:10:28,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 9. [2019-02-28 10:10:28,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2019-02-28 10:10:28,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2019-02-28 10:10:28,436 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 4 [2019-02-28 10:10:28,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:28,437 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2019-02-28 10:10:28,437 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-02-28 10:10:28,437 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2019-02-28 10:10:28,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2019-02-28 10:10:28,438 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:28,438 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1] [2019-02-28 10:10:28,439 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:28,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:28,439 INFO L82 PathProgramCache]: Analyzing trace with hash 1951667359, now seen corresponding path program 1 times [2019-02-28 10:10:28,439 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:28,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:28,441 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:28,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:28,441 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:28,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:28,549 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:28,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:28,550 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:28,551 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 9 with the following transitions: [2019-02-28 10:10:28,553 INFO L207 CegarAbsIntRunner]: [0], [4], [7], [8], [9], [13] [2019-02-28 10:10:28,597 INFO L148 AbstractInterpreter]: Using domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2019-02-28 10:10:28,597 INFO L101 FixpointEngine]: Starting fixpoint engine with domain CompoundDomain (maxUnwinding=3, maxParallelStates=2) [2019-02-28 10:10:28,725 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-02-28 10:10:28,727 INFO L272 AbstractInterpreter]: Visited 6 different actions 16 times. Merged at 5 different actions 10 times. Never widened. Performed 74 root evaluator evaluations with a maximum evaluation depth of 3. Performed 74 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2019-02-28 10:10:28,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:28,736 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-02-28 10:10:28,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:28,736 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 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 [2019-02-28 10:10:28,780 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:28,780 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:10:28,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:28,825 INFO L256 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 13 conjunts are in the unsatisfiable core [2019-02-28 10:10:28,833 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:28,911 INFO L442 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 [2019-02-28 10:10:28,912 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:28,987 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:28,988 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:29,089 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:29,089 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:29,161 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:29,182 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:29,182 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2019-02-28 10:10:29,182 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:29,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-02-28 10:10:29,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-02-28 10:10:29,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2019-02-28 10:10:29,262 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 6 states. [2019-02-28 10:10:29,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:29,338 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2019-02-28 10:10:29,339 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-02-28 10:10:29,339 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 8 [2019-02-28 10:10:29,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:29,340 INFO L225 Difference]: With dead ends: 15 [2019-02-28 10:10:29,340 INFO L226 Difference]: Without dead ends: 14 [2019-02-28 10:10:29,341 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2019-02-28 10:10:29,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-02-28 10:10:29,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2019-02-28 10:10:29,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-02-28 10:10:29,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-02-28 10:10:29,345 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 8 [2019-02-28 10:10:29,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:29,345 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-02-28 10:10:29,345 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-02-28 10:10:29,346 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-02-28 10:10:29,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-02-28 10:10:29,346 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:29,346 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1] [2019-02-28 10:10:29,348 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:29,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:29,349 INFO L82 PathProgramCache]: Analyzing trace with hash 1291763032, now seen corresponding path program 2 times [2019-02-28 10:10:29,349 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:29,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:29,351 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:29,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:29,351 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:29,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:29,623 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:29,623 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:29,624 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:29,624 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:29,624 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:29,624 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:29,625 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 [2019-02-28 10:10:29,638 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:10:29,639 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:10:29,677 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-02-28 10:10:29,677 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:10:29,681 INFO L256 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 16 conjunts are in the unsatisfiable core [2019-02-28 10:10:29,682 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:29,705 INFO L442 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 [2019-02-28 10:10:29,705 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:29,718 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:29,718 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:29,800 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:29,801 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:29,901 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:29,920 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:29,921 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2019-02-28 10:10:29,921 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:29,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-02-28 10:10:29,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-02-28 10:10:29,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2019-02-28 10:10:29,922 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 8 states. [2019-02-28 10:10:30,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:30,060 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2019-02-28 10:10:30,061 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-02-28 10:10:30,061 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 12 [2019-02-28 10:10:30,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:30,062 INFO L225 Difference]: With dead ends: 19 [2019-02-28 10:10:30,062 INFO L226 Difference]: Without dead ends: 18 [2019-02-28 10:10:30,063 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2019-02-28 10:10:30,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-02-28 10:10:30,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2019-02-28 10:10:30,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-02-28 10:10:30,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-02-28 10:10:30,068 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 12 [2019-02-28 10:10:30,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:30,068 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-02-28 10:10:30,068 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-02-28 10:10:30,068 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-02-28 10:10:30,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-02-28 10:10:30,069 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:30,069 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1] [2019-02-28 10:10:30,069 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:30,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:30,070 INFO L82 PathProgramCache]: Analyzing trace with hash 172253585, now seen corresponding path program 3 times [2019-02-28 10:10:30,070 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:30,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:30,071 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:10:30,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:30,072 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:30,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:30,258 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:30,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:30,258 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:30,259 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:30,259 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:30,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:30,259 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 [2019-02-28 10:10:30,269 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:10:30,269 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:10:30,279 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:10:30,280 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:10:30,280 INFO L256 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 19 conjunts are in the unsatisfiable core [2019-02-28 10:10:30,282 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:30,289 INFO L442 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 [2019-02-28 10:10:30,289 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:30,324 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:30,324 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:30,426 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:30,427 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:30,512 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:30,530 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:30,531 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2019-02-28 10:10:30,531 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:30,531 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-02-28 10:10:30,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-02-28 10:10:30,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=97, Unknown=0, NotChecked=0, Total=182 [2019-02-28 10:10:30,533 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 10 states. [2019-02-28 10:10:30,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:30,902 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2019-02-28 10:10:30,903 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-02-28 10:10:30,903 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 16 [2019-02-28 10:10:30,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:30,904 INFO L225 Difference]: With dead ends: 23 [2019-02-28 10:10:30,904 INFO L226 Difference]: Without dead ends: 22 [2019-02-28 10:10:30,905 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=85, Invalid=97, Unknown=0, NotChecked=0, Total=182 [2019-02-28 10:10:30,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-02-28 10:10:30,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2019-02-28 10:10:30,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-02-28 10:10:30,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2019-02-28 10:10:30,909 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 16 [2019-02-28 10:10:30,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:30,909 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2019-02-28 10:10:30,910 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-02-28 10:10:30,910 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2019-02-28 10:10:30,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-02-28 10:10:30,910 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:30,910 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1] [2019-02-28 10:10:30,911 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:30,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:30,911 INFO L82 PathProgramCache]: Analyzing trace with hash -1489288886, now seen corresponding path program 4 times [2019-02-28 10:10:30,911 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:30,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:30,912 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:10:30,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:30,912 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:30,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:31,033 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:31,034 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:31,034 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:31,034 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:31,034 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:31,034 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:31,034 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 [2019-02-28 10:10:31,043 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:31,044 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:10:31,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:31,067 INFO L256 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 22 conjunts are in the unsatisfiable core [2019-02-28 10:10:31,072 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:31,081 INFO L442 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 [2019-02-28 10:10:31,081 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:31,093 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:31,093 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:31,227 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:31,227 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:31,311 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:31,331 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:31,331 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 15 [2019-02-28 10:10:31,331 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:31,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-02-28 10:10:31,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-02-28 10:10:31,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=146, Unknown=0, NotChecked=0, Total=272 [2019-02-28 10:10:31,333 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 12 states. [2019-02-28 10:10:31,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:31,420 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2019-02-28 10:10:31,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-02-28 10:10:31,425 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 20 [2019-02-28 10:10:31,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:31,426 INFO L225 Difference]: With dead ends: 27 [2019-02-28 10:10:31,426 INFO L226 Difference]: Without dead ends: 26 [2019-02-28 10:10:31,427 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=126, Invalid=146, Unknown=0, NotChecked=0, Total=272 [2019-02-28 10:10:31,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-02-28 10:10:31,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2019-02-28 10:10:31,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-02-28 10:10:31,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2019-02-28 10:10:31,432 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 20 [2019-02-28 10:10:31,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:31,433 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2019-02-28 10:10:31,433 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-02-28 10:10:31,433 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2019-02-28 10:10:31,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-02-28 10:10:31,434 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:31,434 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1] [2019-02-28 10:10:31,434 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:31,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:31,435 INFO L82 PathProgramCache]: Analyzing trace with hash 702127235, now seen corresponding path program 5 times [2019-02-28 10:10:31,435 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:31,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:31,436 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:31,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:31,436 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:31,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:31,552 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:31,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:31,553 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:31,553 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:31,553 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:31,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:31,554 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 [2019-02-28 10:10:31,562 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:10:31,562 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:10:31,581 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-02-28 10:10:31,582 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:10:31,583 INFO L256 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 25 conjunts are in the unsatisfiable core [2019-02-28 10:10:31,585 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:31,590 INFO L442 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 [2019-02-28 10:10:31,590 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:31,608 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:31,612 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:31,790 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:31,790 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:31,898 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:31,917 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:31,917 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 18 [2019-02-28 10:10:31,918 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:31,918 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-02-28 10:10:31,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-02-28 10:10:31,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=205, Unknown=0, NotChecked=0, Total=380 [2019-02-28 10:10:31,919 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 14 states. [2019-02-28 10:10:31,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:31,974 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2019-02-28 10:10:31,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-02-28 10:10:31,975 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 24 [2019-02-28 10:10:31,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:31,976 INFO L225 Difference]: With dead ends: 31 [2019-02-28 10:10:31,976 INFO L226 Difference]: Without dead ends: 30 [2019-02-28 10:10:31,977 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=175, Invalid=205, Unknown=0, NotChecked=0, Total=380 [2019-02-28 10:10:31,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-02-28 10:10:31,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2019-02-28 10:10:31,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-02-28 10:10:31,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2019-02-28 10:10:31,982 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 24 [2019-02-28 10:10:31,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:31,982 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2019-02-28 10:10:31,982 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-02-28 10:10:31,982 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2019-02-28 10:10:31,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-02-28 10:10:31,983 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:31,983 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1] [2019-02-28 10:10:31,983 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:31,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:31,984 INFO L82 PathProgramCache]: Analyzing trace with hash 854963004, now seen corresponding path program 6 times [2019-02-28 10:10:31,984 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:31,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:31,985 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:10:31,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:31,985 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:31,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:32,184 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:32,185 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:32,185 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:32,185 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:32,185 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:32,185 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:32,185 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 [2019-02-28 10:10:32,194 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:10:32,194 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:10:32,206 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:10:32,207 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:10:32,208 INFO L256 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 28 conjunts are in the unsatisfiable core [2019-02-28 10:10:32,210 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:32,216 INFO L442 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 [2019-02-28 10:10:32,216 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:32,227 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:32,227 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:32,352 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:32,352 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:32,457 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:32,485 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:32,486 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 21 [2019-02-28 10:10:32,486 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:32,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-02-28 10:10:32,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-02-28 10:10:32,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=274, Unknown=0, NotChecked=0, Total=506 [2019-02-28 10:10:32,487 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 16 states. [2019-02-28 10:10:32,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:32,584 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2019-02-28 10:10:32,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-02-28 10:10:32,585 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 28 [2019-02-28 10:10:32,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:32,587 INFO L225 Difference]: With dead ends: 35 [2019-02-28 10:10:32,587 INFO L226 Difference]: Without dead ends: 34 [2019-02-28 10:10:32,588 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=232, Invalid=274, Unknown=0, NotChecked=0, Total=506 [2019-02-28 10:10:32,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-02-28 10:10:32,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2019-02-28 10:10:32,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-02-28 10:10:32,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2019-02-28 10:10:32,593 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 28 [2019-02-28 10:10:32,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:32,593 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2019-02-28 10:10:32,593 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-02-28 10:10:32,593 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2019-02-28 10:10:32,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-02-28 10:10:32,595 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:32,596 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1] [2019-02-28 10:10:32,596 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:32,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:32,596 INFO L82 PathProgramCache]: Analyzing trace with hash -1908030091, now seen corresponding path program 7 times [2019-02-28 10:10:32,596 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:32,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:32,597 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:10:32,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:32,597 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:32,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:32,812 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:32,813 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:32,813 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:32,813 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:32,813 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:32,813 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:32,813 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 [2019-02-28 10:10:32,822 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:32,822 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:10:32,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:32,836 INFO L256 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 31 conjunts are in the unsatisfiable core [2019-02-28 10:10:32,837 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:32,841 INFO L442 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 [2019-02-28 10:10:32,841 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:32,851 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:32,851 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:32,991 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:32,991 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:33,157 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:33,175 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:33,176 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 24 [2019-02-28 10:10:33,176 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:33,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-02-28 10:10:33,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-02-28 10:10:33,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=353, Unknown=0, NotChecked=0, Total=650 [2019-02-28 10:10:33,178 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 18 states. [2019-02-28 10:10:33,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:33,373 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2019-02-28 10:10:33,374 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-02-28 10:10:33,374 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 32 [2019-02-28 10:10:33,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:33,375 INFO L225 Difference]: With dead ends: 39 [2019-02-28 10:10:33,375 INFO L226 Difference]: Without dead ends: 38 [2019-02-28 10:10:33,376 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=297, Invalid=353, Unknown=0, NotChecked=0, Total=650 [2019-02-28 10:10:33,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-02-28 10:10:33,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2019-02-28 10:10:33,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-02-28 10:10:33,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2019-02-28 10:10:33,381 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 32 [2019-02-28 10:10:33,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:33,381 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2019-02-28 10:10:33,382 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-02-28 10:10:33,382 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2019-02-28 10:10:33,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-02-28 10:10:33,383 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:33,383 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1] [2019-02-28 10:10:33,383 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:33,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:33,383 INFO L82 PathProgramCache]: Analyzing trace with hash -1033891026, now seen corresponding path program 8 times [2019-02-28 10:10:33,383 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:33,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:33,384 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:33,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:33,385 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:33,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:33,538 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:33,538 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:33,538 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:33,538 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:33,538 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:33,538 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:33,539 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 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 [2019-02-28 10:10:33,550 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:10:33,551 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:10:33,583 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-02-28 10:10:33,583 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:10:33,584 INFO L256 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 34 conjunts are in the unsatisfiable core [2019-02-28 10:10:33,586 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:33,605 INFO L442 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 [2019-02-28 10:10:33,605 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:33,635 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:33,635 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:34,024 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:34,024 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:34,387 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:34,406 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:34,406 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 27 [2019-02-28 10:10:34,407 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:34,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-02-28 10:10:34,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-02-28 10:10:34,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=442, Unknown=0, NotChecked=0, Total=812 [2019-02-28 10:10:34,408 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 20 states. [2019-02-28 10:10:34,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:34,527 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2019-02-28 10:10:34,527 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-02-28 10:10:34,528 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 36 [2019-02-28 10:10:34,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:34,529 INFO L225 Difference]: With dead ends: 43 [2019-02-28 10:10:34,529 INFO L226 Difference]: Without dead ends: 42 [2019-02-28 10:10:34,530 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=370, Invalid=442, Unknown=0, NotChecked=0, Total=812 [2019-02-28 10:10:34,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-02-28 10:10:34,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2019-02-28 10:10:34,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-02-28 10:10:34,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2019-02-28 10:10:34,535 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 36 [2019-02-28 10:10:34,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:34,535 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2019-02-28 10:10:34,535 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-02-28 10:10:34,536 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2019-02-28 10:10:34,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-02-28 10:10:34,536 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:34,537 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1] [2019-02-28 10:10:34,537 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:34,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:34,537 INFO L82 PathProgramCache]: Analyzing trace with hash -1598366617, now seen corresponding path program 9 times [2019-02-28 10:10:34,537 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:34,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:34,538 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:10:34,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:34,539 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:34,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:34,817 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:34,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:34,818 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:34,818 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:34,818 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:34,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:34,818 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 [2019-02-28 10:10:34,827 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:10:34,828 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:10:34,844 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:10:34,844 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:10:34,845 INFO L256 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 37 conjunts are in the unsatisfiable core [2019-02-28 10:10:34,847 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:34,852 INFO L442 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 [2019-02-28 10:10:34,852 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:34,860 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:34,861 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:35,088 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:35,088 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:35,431 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:35,450 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:35,450 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 30 [2019-02-28 10:10:35,451 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:35,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-02-28 10:10:35,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-02-28 10:10:35,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=541, Unknown=0, NotChecked=0, Total=992 [2019-02-28 10:10:35,452 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 22 states. [2019-02-28 10:10:35,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:35,532 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2019-02-28 10:10:35,532 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-02-28 10:10:35,533 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 40 [2019-02-28 10:10:35,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:35,534 INFO L225 Difference]: With dead ends: 47 [2019-02-28 10:10:35,534 INFO L226 Difference]: Without dead ends: 46 [2019-02-28 10:10:35,535 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=451, Invalid=541, Unknown=0, NotChecked=0, Total=992 [2019-02-28 10:10:35,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-02-28 10:10:35,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2019-02-28 10:10:35,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-02-28 10:10:35,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2019-02-28 10:10:35,541 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 40 [2019-02-28 10:10:35,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:35,541 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2019-02-28 10:10:35,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-02-28 10:10:35,541 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2019-02-28 10:10:35,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-02-28 10:10:35,542 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:35,542 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1] [2019-02-28 10:10:35,542 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:35,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:35,543 INFO L82 PathProgramCache]: Analyzing trace with hash -710123232, now seen corresponding path program 10 times [2019-02-28 10:10:35,543 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:35,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:35,544 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:10:35,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:35,544 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:35,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:35,898 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:35,898 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:35,898 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:35,898 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:35,898 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:35,898 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:35,898 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 [2019-02-28 10:10:35,908 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:35,908 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:10:35,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:35,942 INFO L256 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 40 conjunts are in the unsatisfiable core [2019-02-28 10:10:35,944 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:35,967 INFO L442 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 [2019-02-28 10:10:35,968 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:35,996 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:35,996 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:36,201 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:36,201 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:36,416 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:36,434 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:36,435 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 33 [2019-02-28 10:10:36,435 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:36,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-02-28 10:10:36,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-02-28 10:10:36,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=650, Unknown=0, NotChecked=0, Total=1190 [2019-02-28 10:10:36,436 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 24 states. [2019-02-28 10:10:36,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:36,530 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2019-02-28 10:10:36,530 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-02-28 10:10:36,530 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 44 [2019-02-28 10:10:36,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:36,531 INFO L225 Difference]: With dead ends: 51 [2019-02-28 10:10:36,531 INFO L226 Difference]: Without dead ends: 50 [2019-02-28 10:10:36,532 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=540, Invalid=650, Unknown=0, NotChecked=0, Total=1190 [2019-02-28 10:10:36,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-02-28 10:10:36,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2019-02-28 10:10:36,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-02-28 10:10:36,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2019-02-28 10:10:36,539 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 44 [2019-02-28 10:10:36,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:36,539 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2019-02-28 10:10:36,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-02-28 10:10:36,544 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2019-02-28 10:10:36,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-02-28 10:10:36,545 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:36,546 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1] [2019-02-28 10:10:36,546 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:36,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:36,546 INFO L82 PathProgramCache]: Analyzing trace with hash 2020270425, now seen corresponding path program 11 times [2019-02-28 10:10:36,546 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:36,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:36,547 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:36,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:36,547 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:36,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:36,790 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:36,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:36,791 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:36,791 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:36,791 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:36,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:36,791 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 [2019-02-28 10:10:36,800 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:10:36,800 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:10:36,829 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-02-28 10:10:36,830 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:10:36,831 INFO L256 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 43 conjunts are in the unsatisfiable core [2019-02-28 10:10:36,833 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:36,854 INFO L442 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 [2019-02-28 10:10:36,854 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:36,865 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:36,865 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:37,115 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:37,115 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:37,361 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:37,380 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:37,380 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 36 [2019-02-28 10:10:37,380 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:37,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-02-28 10:10:37,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-02-28 10:10:37,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=637, Invalid=769, Unknown=0, NotChecked=0, Total=1406 [2019-02-28 10:10:37,382 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 26 states. [2019-02-28 10:10:37,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:37,472 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2019-02-28 10:10:37,472 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-02-28 10:10:37,472 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 48 [2019-02-28 10:10:37,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:37,473 INFO L225 Difference]: With dead ends: 55 [2019-02-28 10:10:37,473 INFO L226 Difference]: Without dead ends: 54 [2019-02-28 10:10:37,474 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=637, Invalid=769, Unknown=0, NotChecked=0, Total=1406 [2019-02-28 10:10:37,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-02-28 10:10:37,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2019-02-28 10:10:37,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-02-28 10:10:37,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2019-02-28 10:10:37,480 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 48 [2019-02-28 10:10:37,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:37,481 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2019-02-28 10:10:37,481 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-02-28 10:10:37,481 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2019-02-28 10:10:37,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-02-28 10:10:37,482 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:37,482 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1] [2019-02-28 10:10:37,482 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:37,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:37,482 INFO L82 PathProgramCache]: Analyzing trace with hash -1693672174, now seen corresponding path program 12 times [2019-02-28 10:10:37,483 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:37,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:37,483 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:10:37,484 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:37,484 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:37,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:37,738 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:37,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:37,738 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:37,738 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:37,739 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:37,739 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:37,739 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 [2019-02-28 10:10:37,750 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:10:37,750 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:10:37,766 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:10:37,766 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:10:37,767 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 46 conjunts are in the unsatisfiable core [2019-02-28 10:10:37,769 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:37,783 INFO L442 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 [2019-02-28 10:10:37,783 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:37,788 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:37,788 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:38,030 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:38,030 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:38,376 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:38,394 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:38,395 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 39 [2019-02-28 10:10:38,395 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:38,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-02-28 10:10:38,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-02-28 10:10:38,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=742, Invalid=898, Unknown=0, NotChecked=0, Total=1640 [2019-02-28 10:10:38,396 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 28 states. [2019-02-28 10:10:38,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:38,487 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2019-02-28 10:10:38,487 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-02-28 10:10:38,487 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 52 [2019-02-28 10:10:38,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:38,488 INFO L225 Difference]: With dead ends: 59 [2019-02-28 10:10:38,488 INFO L226 Difference]: Without dead ends: 58 [2019-02-28 10:10:38,490 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=742, Invalid=898, Unknown=0, NotChecked=0, Total=1640 [2019-02-28 10:10:38,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-02-28 10:10:38,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2019-02-28 10:10:38,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-02-28 10:10:38,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2019-02-28 10:10:38,496 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 52 [2019-02-28 10:10:38,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:38,496 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2019-02-28 10:10:38,496 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-02-28 10:10:38,496 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2019-02-28 10:10:38,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-02-28 10:10:38,497 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:38,497 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1] [2019-02-28 10:10:38,498 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:38,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:38,498 INFO L82 PathProgramCache]: Analyzing trace with hash -628632501, now seen corresponding path program 13 times [2019-02-28 10:10:38,498 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:38,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:38,499 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:10:38,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:38,499 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:38,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:39,484 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:39,485 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:39,485 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:39,485 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:39,485 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:39,485 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:39,485 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 [2019-02-28 10:10:39,495 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:39,495 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:10:39,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:39,528 INFO L256 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 49 conjunts are in the unsatisfiable core [2019-02-28 10:10:39,531 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:39,541 INFO L442 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 [2019-02-28 10:10:39,542 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:39,561 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:39,562 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:39,815 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:39,815 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:40,772 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:40,792 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:40,792 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 42 [2019-02-28 10:10:40,792 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:40,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-02-28 10:10:40,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-02-28 10:10:40,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=855, Invalid=1037, Unknown=0, NotChecked=0, Total=1892 [2019-02-28 10:10:40,793 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 30 states. [2019-02-28 10:10:40,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:40,995 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2019-02-28 10:10:40,995 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-02-28 10:10:40,995 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 56 [2019-02-28 10:10:40,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:40,996 INFO L225 Difference]: With dead ends: 63 [2019-02-28 10:10:40,997 INFO L226 Difference]: Without dead ends: 62 [2019-02-28 10:10:40,998 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 756 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=855, Invalid=1037, Unknown=0, NotChecked=0, Total=1892 [2019-02-28 10:10:40,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-02-28 10:10:41,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2019-02-28 10:10:41,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-02-28 10:10:41,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2019-02-28 10:10:41,004 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 56 [2019-02-28 10:10:41,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:41,004 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2019-02-28 10:10:41,004 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-02-28 10:10:41,004 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2019-02-28 10:10:41,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-02-28 10:10:41,005 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:41,005 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1] [2019-02-28 10:10:41,005 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:41,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:41,006 INFO L82 PathProgramCache]: Analyzing trace with hash -290273532, now seen corresponding path program 14 times [2019-02-28 10:10:41,006 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:41,007 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:41,007 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:41,007 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:41,007 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:41,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:41,348 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:41,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:41,349 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:41,349 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:41,349 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:41,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:41,349 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 [2019-02-28 10:10:41,363 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:10:41,364 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:10:41,396 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2019-02-28 10:10:41,396 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:10:41,397 INFO L256 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 52 conjunts are in the unsatisfiable core [2019-02-28 10:10:41,400 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:41,403 INFO L442 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 [2019-02-28 10:10:41,403 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:41,413 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:41,414 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:42,414 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:42,415 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:42,726 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:42,744 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:42,744 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 45 [2019-02-28 10:10:42,744 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:42,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-02-28 10:10:42,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-02-28 10:10:42,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=976, Invalid=1186, Unknown=0, NotChecked=0, Total=2162 [2019-02-28 10:10:42,746 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 32 states. [2019-02-28 10:10:42,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:42,956 INFO L93 Difference]: Finished difference Result 67 states and 67 transitions. [2019-02-28 10:10:42,957 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-02-28 10:10:42,957 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 60 [2019-02-28 10:10:42,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:42,958 INFO L225 Difference]: With dead ends: 67 [2019-02-28 10:10:42,958 INFO L226 Difference]: Without dead ends: 66 [2019-02-28 10:10:42,959 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 870 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=976, Invalid=1186, Unknown=0, NotChecked=0, Total=2162 [2019-02-28 10:10:42,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-02-28 10:10:42,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2019-02-28 10:10:42,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-02-28 10:10:42,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2019-02-28 10:10:42,965 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 60 [2019-02-28 10:10:42,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:42,965 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2019-02-28 10:10:42,966 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-02-28 10:10:42,966 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2019-02-28 10:10:42,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-02-28 10:10:42,967 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:42,967 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1] [2019-02-28 10:10:42,967 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:42,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:42,967 INFO L82 PathProgramCache]: Analyzing trace with hash 977515837, now seen corresponding path program 15 times [2019-02-28 10:10:42,968 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:42,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:42,968 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:10:42,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:42,969 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:42,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:43,297 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:43,297 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:43,297 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:43,297 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:43,298 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:43,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:43,298 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 [2019-02-28 10:10:43,306 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:10:43,306 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:10:43,324 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:10:43,324 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:10:43,325 INFO L256 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 55 conjunts are in the unsatisfiable core [2019-02-28 10:10:43,327 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:43,334 INFO L442 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 [2019-02-28 10:10:43,335 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:43,341 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:43,342 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:43,577 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:43,577 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:43,933 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:43,952 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:43,952 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 48 [2019-02-28 10:10:43,952 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:43,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-02-28 10:10:43,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-02-28 10:10:43,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1105, Invalid=1345, Unknown=0, NotChecked=0, Total=2450 [2019-02-28 10:10:43,954 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 34 states. [2019-02-28 10:10:44,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:44,092 INFO L93 Difference]: Finished difference Result 71 states and 71 transitions. [2019-02-28 10:10:44,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-02-28 10:10:44,093 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 64 [2019-02-28 10:10:44,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:44,094 INFO L225 Difference]: With dead ends: 71 [2019-02-28 10:10:44,094 INFO L226 Difference]: Without dead ends: 70 [2019-02-28 10:10:44,096 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1105, Invalid=1345, Unknown=0, NotChecked=0, Total=2450 [2019-02-28 10:10:44,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-02-28 10:10:44,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2019-02-28 10:10:44,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2019-02-28 10:10:44,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2019-02-28 10:10:44,101 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 64 [2019-02-28 10:10:44,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:44,101 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2019-02-28 10:10:44,101 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-02-28 10:10:44,101 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2019-02-28 10:10:44,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-02-28 10:10:44,102 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:44,102 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1] [2019-02-28 10:10:44,103 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:44,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:44,103 INFO L82 PathProgramCache]: Analyzing trace with hash 1523638006, now seen corresponding path program 16 times [2019-02-28 10:10:44,103 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:44,104 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:44,104 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:10:44,104 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:44,104 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:44,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:44,678 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:44,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:44,679 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:44,679 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:44,679 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:44,679 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:44,679 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 [2019-02-28 10:10:44,688 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:44,688 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:10:44,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:44,709 INFO L256 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 58 conjunts are in the unsatisfiable core [2019-02-28 10:10:44,712 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:44,719 INFO L442 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 [2019-02-28 10:10:44,720 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:44,730 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:44,730 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:45,641 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:45,641 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:46,060 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:46,079 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:46,079 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 51 [2019-02-28 10:10:46,079 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:46,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-02-28 10:10:46,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-02-28 10:10:46,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1242, Invalid=1514, Unknown=0, NotChecked=0, Total=2756 [2019-02-28 10:10:46,081 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 36 states. [2019-02-28 10:10:46,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:46,185 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2019-02-28 10:10:46,192 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-02-28 10:10:46,192 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 68 [2019-02-28 10:10:46,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:46,193 INFO L225 Difference]: With dead ends: 75 [2019-02-28 10:10:46,193 INFO L226 Difference]: Without dead ends: 74 [2019-02-28 10:10:46,194 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1122 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1242, Invalid=1514, Unknown=0, NotChecked=0, Total=2756 [2019-02-28 10:10:46,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-02-28 10:10:46,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2019-02-28 10:10:46,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-02-28 10:10:46,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2019-02-28 10:10:46,198 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 68 [2019-02-28 10:10:46,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:46,198 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2019-02-28 10:10:46,198 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-02-28 10:10:46,199 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2019-02-28 10:10:46,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-02-28 10:10:46,199 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:46,200 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1] [2019-02-28 10:10:46,200 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:46,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:46,200 INFO L82 PathProgramCache]: Analyzing trace with hash -1194294225, now seen corresponding path program 17 times [2019-02-28 10:10:46,200 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:46,201 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:46,201 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:46,201 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:46,201 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:46,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:46,474 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:46,475 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:46,475 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:46,475 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:46,475 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:46,475 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:46,475 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 [2019-02-28 10:10:46,483 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:10:46,484 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:10:46,529 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2019-02-28 10:10:46,530 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:10:46,531 INFO L256 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 61 conjunts are in the unsatisfiable core [2019-02-28 10:10:46,534 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:46,554 INFO L442 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 [2019-02-28 10:10:46,554 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:46,562 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:46,562 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:46,842 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:46,842 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:47,302 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:47,321 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:47,321 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 54 [2019-02-28 10:10:47,321 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:47,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-02-28 10:10:47,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-02-28 10:10:47,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1387, Invalid=1693, Unknown=0, NotChecked=0, Total=3080 [2019-02-28 10:10:47,323 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 38 states. [2019-02-28 10:10:47,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:47,449 INFO L93 Difference]: Finished difference Result 79 states and 79 transitions. [2019-02-28 10:10:47,456 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-02-28 10:10:47,456 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 72 [2019-02-28 10:10:47,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:47,456 INFO L225 Difference]: With dead ends: 79 [2019-02-28 10:10:47,457 INFO L226 Difference]: Without dead ends: 78 [2019-02-28 10:10:47,458 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1260 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1387, Invalid=1693, Unknown=0, NotChecked=0, Total=3080 [2019-02-28 10:10:47,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-02-28 10:10:47,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2019-02-28 10:10:47,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2019-02-28 10:10:47,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2019-02-28 10:10:47,462 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 72 [2019-02-28 10:10:47,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:47,462 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2019-02-28 10:10:47,462 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-02-28 10:10:47,462 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2019-02-28 10:10:47,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2019-02-28 10:10:47,463 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:47,463 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1] [2019-02-28 10:10:47,463 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:47,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:47,464 INFO L82 PathProgramCache]: Analyzing trace with hash 395896040, now seen corresponding path program 18 times [2019-02-28 10:10:47,464 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:47,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:47,465 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:10:47,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:47,465 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:47,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:47,812 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:47,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:47,812 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:47,813 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:47,813 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:47,813 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:47,813 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 [2019-02-28 10:10:47,821 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:10:47,821 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:10:47,846 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:10:47,846 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:10:47,848 INFO L256 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 64 conjunts are in the unsatisfiable core [2019-02-28 10:10:47,850 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:47,871 INFO L442 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 [2019-02-28 10:10:47,872 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:47,881 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:47,882 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:48,419 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:48,419 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:48,981 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:48,999 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:49,000 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 57 [2019-02-28 10:10:49,000 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:49,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-02-28 10:10:49,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-02-28 10:10:49,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1882, Unknown=0, NotChecked=0, Total=3422 [2019-02-28 10:10:49,002 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 40 states. [2019-02-28 10:10:49,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:49,168 INFO L93 Difference]: Finished difference Result 83 states and 83 transitions. [2019-02-28 10:10:49,168 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-02-28 10:10:49,168 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 76 [2019-02-28 10:10:49,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:49,169 INFO L225 Difference]: With dead ends: 83 [2019-02-28 10:10:49,169 INFO L226 Difference]: Without dead ends: 82 [2019-02-28 10:10:49,171 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1406 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1540, Invalid=1882, Unknown=0, NotChecked=0, Total=3422 [2019-02-28 10:10:49,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2019-02-28 10:10:49,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2019-02-28 10:10:49,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2019-02-28 10:10:49,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2019-02-28 10:10:49,175 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 76 [2019-02-28 10:10:49,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:49,176 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2019-02-28 10:10:49,176 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2019-02-28 10:10:49,176 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2019-02-28 10:10:49,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2019-02-28 10:10:49,177 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:49,177 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1] [2019-02-28 10:10:49,177 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:49,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:49,177 INFO L82 PathProgramCache]: Analyzing trace with hash 627065121, now seen corresponding path program 19 times [2019-02-28 10:10:49,177 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:49,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:49,178 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:10:49,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:49,179 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:49,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:49,962 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:49,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:49,962 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:49,962 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:49,963 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:49,963 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:49,963 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 [2019-02-28 10:10:49,971 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:49,971 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:10:49,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:49,997 INFO L256 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 67 conjunts are in the unsatisfiable core [2019-02-28 10:10:49,999 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:50,010 INFO L442 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 [2019-02-28 10:10:50,011 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:50,021 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:50,021 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:50,310 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:50,310 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:50,885 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:50,904 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:50,904 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 60 [2019-02-28 10:10:50,904 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:50,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2019-02-28 10:10:50,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2019-02-28 10:10:50,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1701, Invalid=2081, Unknown=0, NotChecked=0, Total=3782 [2019-02-28 10:10:50,906 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 42 states. [2019-02-28 10:10:51,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:51,042 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2019-02-28 10:10:51,042 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-02-28 10:10:51,043 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 80 [2019-02-28 10:10:51,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:51,044 INFO L225 Difference]: With dead ends: 87 [2019-02-28 10:10:51,044 INFO L226 Difference]: Without dead ends: 86 [2019-02-28 10:10:51,046 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1560 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1701, Invalid=2081, Unknown=0, NotChecked=0, Total=3782 [2019-02-28 10:10:51,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2019-02-28 10:10:51,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2019-02-28 10:10:51,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2019-02-28 10:10:51,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2019-02-28 10:10:51,049 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 80 [2019-02-28 10:10:51,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:51,050 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2019-02-28 10:10:51,050 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2019-02-28 10:10:51,050 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2019-02-28 10:10:51,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-02-28 10:10:51,051 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:51,051 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1] [2019-02-28 10:10:51,051 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:51,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:51,051 INFO L82 PathProgramCache]: Analyzing trace with hash 188537050, now seen corresponding path program 20 times [2019-02-28 10:10:51,052 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:51,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:51,052 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:51,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:51,053 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:51,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:51,695 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:51,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:51,695 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:51,695 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:51,695 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:51,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:51,695 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 [2019-02-28 10:10:51,704 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:10:51,704 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:10:51,756 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2019-02-28 10:10:51,756 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:10:51,758 INFO L256 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 70 conjunts are in the unsatisfiable core [2019-02-28 10:10:51,760 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:51,765 INFO L442 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 [2019-02-28 10:10:51,766 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:51,777 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:51,777 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:52,139 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:52,139 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:52,776 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:52,794 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:52,795 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 63 [2019-02-28 10:10:52,795 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:52,795 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-02-28 10:10:52,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-02-28 10:10:52,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1870, Invalid=2290, Unknown=0, NotChecked=0, Total=4160 [2019-02-28 10:10:52,797 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 44 states. [2019-02-28 10:10:52,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:52,993 INFO L93 Difference]: Finished difference Result 91 states and 91 transitions. [2019-02-28 10:10:52,993 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-02-28 10:10:52,994 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 84 [2019-02-28 10:10:52,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:52,995 INFO L225 Difference]: With dead ends: 91 [2019-02-28 10:10:52,995 INFO L226 Difference]: Without dead ends: 90 [2019-02-28 10:10:52,997 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1722 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1870, Invalid=2290, Unknown=0, NotChecked=0, Total=4160 [2019-02-28 10:10:52,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2019-02-28 10:10:52,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2019-02-28 10:10:52,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2019-02-28 10:10:53,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2019-02-28 10:10:53,000 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 84 [2019-02-28 10:10:53,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:53,000 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2019-02-28 10:10:53,000 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-02-28 10:10:53,000 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2019-02-28 10:10:53,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2019-02-28 10:10:53,001 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:53,001 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 1, 1] [2019-02-28 10:10:53,001 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:53,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:53,001 INFO L82 PathProgramCache]: Analyzing trace with hash -47911917, now seen corresponding path program 21 times [2019-02-28 10:10:53,002 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:53,002 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:53,002 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:10:53,002 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:53,002 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:53,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:53,392 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:53,392 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:53,392 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:53,392 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:53,393 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:53,393 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:53,393 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 [2019-02-28 10:10:53,413 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:10:53,413 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:10:53,471 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:10:53,471 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:10:53,474 INFO L256 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 73 conjunts are in the unsatisfiable core [2019-02-28 10:10:53,476 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:53,493 INFO L442 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 [2019-02-28 10:10:53,493 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:53,539 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:53,539 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:53,916 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:53,916 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:54,586 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:54,605 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:54,605 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 66 [2019-02-28 10:10:54,605 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:54,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2019-02-28 10:10:54,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2019-02-28 10:10:54,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2047, Invalid=2509, Unknown=0, NotChecked=0, Total=4556 [2019-02-28 10:10:54,607 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 46 states. [2019-02-28 10:10:54,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:54,821 INFO L93 Difference]: Finished difference Result 95 states and 95 transitions. [2019-02-28 10:10:54,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-02-28 10:10:54,824 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 88 [2019-02-28 10:10:54,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:54,824 INFO L225 Difference]: With dead ends: 95 [2019-02-28 10:10:54,824 INFO L226 Difference]: Without dead ends: 94 [2019-02-28 10:10:54,825 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1892 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2047, Invalid=2509, Unknown=0, NotChecked=0, Total=4556 [2019-02-28 10:10:54,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-02-28 10:10:54,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2019-02-28 10:10:54,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2019-02-28 10:10:54,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2019-02-28 10:10:54,828 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 88 [2019-02-28 10:10:54,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:54,828 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2019-02-28 10:10:54,828 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2019-02-28 10:10:54,828 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2019-02-28 10:10:54,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2019-02-28 10:10:54,829 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:54,829 INFO L402 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 1, 1] [2019-02-28 10:10:54,829 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:54,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:54,830 INFO L82 PathProgramCache]: Analyzing trace with hash -907101492, now seen corresponding path program 22 times [2019-02-28 10:10:54,830 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:54,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:54,830 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:10:54,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:54,831 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:54,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:55,229 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:55,229 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:55,229 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:55,229 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:55,229 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:55,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:55,230 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 [2019-02-28 10:10:55,238 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:55,238 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:10:55,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:55,267 INFO L256 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 76 conjunts are in the unsatisfiable core [2019-02-28 10:10:55,268 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:55,275 INFO L442 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 [2019-02-28 10:10:55,282 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:55,291 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:55,291 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:55,669 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:55,669 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:56,426 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:56,445 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:56,445 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 69 [2019-02-28 10:10:56,445 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:56,446 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2019-02-28 10:10:56,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2019-02-28 10:10:56,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2232, Invalid=2738, Unknown=0, NotChecked=0, Total=4970 [2019-02-28 10:10:56,447 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 48 states. [2019-02-28 10:10:56,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:56,600 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2019-02-28 10:10:56,601 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-02-28 10:10:56,601 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 92 [2019-02-28 10:10:56,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:56,602 INFO L225 Difference]: With dead ends: 99 [2019-02-28 10:10:56,602 INFO L226 Difference]: Without dead ends: 98 [2019-02-28 10:10:56,604 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2070 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2232, Invalid=2738, Unknown=0, NotChecked=0, Total=4970 [2019-02-28 10:10:56,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2019-02-28 10:10:56,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2019-02-28 10:10:56,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2019-02-28 10:10:56,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2019-02-28 10:10:56,607 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 92 [2019-02-28 10:10:56,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:56,608 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2019-02-28 10:10:56,608 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2019-02-28 10:10:56,608 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2019-02-28 10:10:56,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2019-02-28 10:10:56,609 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:56,609 INFO L402 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 1, 1] [2019-02-28 10:10:56,609 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:56,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:56,609 INFO L82 PathProgramCache]: Analyzing trace with hash 1800439045, now seen corresponding path program 23 times [2019-02-28 10:10:56,610 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:56,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:56,610 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:10:56,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:56,610 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:56,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:57,032 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:57,032 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:57,032 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:57,033 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:57,033 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:57,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:57,033 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 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 [2019-02-28 10:10:57,041 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:10:57,041 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:10:57,103 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2019-02-28 10:10:57,103 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:10:57,106 INFO L256 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 79 conjunts are in the unsatisfiable core [2019-02-28 10:10:57,108 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:57,116 INFO L442 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 [2019-02-28 10:10:57,116 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:57,129 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:57,129 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:10:57,735 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:57,736 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:10:58,497 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:58,516 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:10:58,516 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 72 [2019-02-28 10:10:58,516 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:10:58,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2019-02-28 10:10:58,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2019-02-28 10:10:58,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2019-02-28 10:10:58,518 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 50 states. [2019-02-28 10:10:58,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:10:58,770 INFO L93 Difference]: Finished difference Result 103 states and 103 transitions. [2019-02-28 10:10:58,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-02-28 10:10:58,771 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 96 [2019-02-28 10:10:58,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:10:58,772 INFO L225 Difference]: With dead ends: 103 [2019-02-28 10:10:58,772 INFO L226 Difference]: Without dead ends: 102 [2019-02-28 10:10:58,773 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2256 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2019-02-28 10:10:58,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2019-02-28 10:10:58,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2019-02-28 10:10:58,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2019-02-28 10:10:58,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2019-02-28 10:10:58,777 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 96 [2019-02-28 10:10:58,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:10:58,778 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2019-02-28 10:10:58,778 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2019-02-28 10:10:58,778 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2019-02-28 10:10:58,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2019-02-28 10:10:58,779 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:10:58,779 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 1, 1] [2019-02-28 10:10:58,779 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:10:58,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:10:58,780 INFO L82 PathProgramCache]: Analyzing trace with hash -1780446530, now seen corresponding path program 24 times [2019-02-28 10:10:58,780 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:10:58,780 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:58,780 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:10:58,781 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:10:58,781 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:10:58,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:10:59,328 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:10:59,328 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:59,328 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:10:59,328 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:10:59,329 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:10:59,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:10:59,329 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 [2019-02-28 10:10:59,337 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:10:59,337 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:10:59,378 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:10:59,378 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:10:59,380 INFO L256 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 82 conjunts are in the unsatisfiable core [2019-02-28 10:10:59,383 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:10:59,404 INFO L442 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 [2019-02-28 10:10:59,405 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:10:59,463 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:10:59,463 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:11:00,200 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:00,200 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:11:01,013 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:01,033 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:11:01,033 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 75 [2019-02-28 10:11:01,033 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:11:01,034 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2019-02-28 10:11:01,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2019-02-28 10:11:01,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=3226, Unknown=0, NotChecked=0, Total=5852 [2019-02-28 10:11:01,035 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 52 states. [2019-02-28 10:11:01,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:11:01,219 INFO L93 Difference]: Finished difference Result 107 states and 107 transitions. [2019-02-28 10:11:01,219 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-02-28 10:11:01,219 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 100 [2019-02-28 10:11:01,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:11:01,220 INFO L225 Difference]: With dead ends: 107 [2019-02-28 10:11:01,220 INFO L226 Difference]: Without dead ends: 106 [2019-02-28 10:11:01,221 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2450 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2626, Invalid=3226, Unknown=0, NotChecked=0, Total=5852 [2019-02-28 10:11:01,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2019-02-28 10:11:01,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2019-02-28 10:11:01,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2019-02-28 10:11:01,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2019-02-28 10:11:01,224 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 100 [2019-02-28 10:11:01,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:11:01,225 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2019-02-28 10:11:01,225 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2019-02-28 10:11:01,225 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2019-02-28 10:11:01,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2019-02-28 10:11:01,226 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:11:01,226 INFO L402 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 1, 1] [2019-02-28 10:11:01,226 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:11:01,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:11:01,226 INFO L82 PathProgramCache]: Analyzing trace with hash 1226116087, now seen corresponding path program 25 times [2019-02-28 10:11:01,226 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:11:01,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:01,227 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:11:01,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:01,227 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:11:01,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:02,421 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:02,421 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:02,421 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:11:02,421 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:11:02,421 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:11:02,421 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:02,421 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 [2019-02-28 10:11:02,429 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:11:02,430 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:11:02,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:02,459 INFO L256 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 85 conjunts are in the unsatisfiable core [2019-02-28 10:11:02,460 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:11:02,463 INFO L442 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 [2019-02-28 10:11:02,463 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:11:02,484 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:11:02,485 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:11:02,978 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:02,979 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:11:03,916 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:03,934 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:11:03,934 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 78 [2019-02-28 10:11:03,934 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:11:03,935 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2019-02-28 10:11:03,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2019-02-28 10:11:03,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2835, Invalid=3485, Unknown=0, NotChecked=0, Total=6320 [2019-02-28 10:11:03,936 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 54 states. [2019-02-28 10:11:04,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:11:04,135 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2019-02-28 10:11:04,135 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-02-28 10:11:04,135 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 104 [2019-02-28 10:11:04,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:11:04,136 INFO L225 Difference]: With dead ends: 111 [2019-02-28 10:11:04,136 INFO L226 Difference]: Without dead ends: 110 [2019-02-28 10:11:04,137 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2652 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2835, Invalid=3485, Unknown=0, NotChecked=0, Total=6320 [2019-02-28 10:11:04,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2019-02-28 10:11:04,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2019-02-28 10:11:04,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2019-02-28 10:11:04,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2019-02-28 10:11:04,140 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 104 [2019-02-28 10:11:04,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:11:04,141 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2019-02-28 10:11:04,141 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2019-02-28 10:11:04,141 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2019-02-28 10:11:04,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2019-02-28 10:11:04,141 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:11:04,141 INFO L402 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 1, 1] [2019-02-28 10:11:04,142 INFO L423 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:11:04,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:11:04,142 INFO L82 PathProgramCache]: Analyzing trace with hash 1598310576, now seen corresponding path program 26 times [2019-02-28 10:11:04,142 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:11:04,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:04,143 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:11:04,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:04,143 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:11:04,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:04,641 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:04,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:04,641 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:11:04,641 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:11:04,641 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:11:04,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:04,641 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 [2019-02-28 10:11:04,649 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:11:04,649 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:11:04,720 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2019-02-28 10:11:04,721 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:11:04,722 INFO L256 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 88 conjunts are in the unsatisfiable core [2019-02-28 10:11:04,724 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:11:04,731 INFO L442 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 [2019-02-28 10:11:04,731 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:11:04,740 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:11:04,741 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:11:05,520 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:05,520 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:11:06,484 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:06,504 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:11:06,504 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 81 [2019-02-28 10:11:06,504 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:11:06,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2019-02-28 10:11:06,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2019-02-28 10:11:06,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3052, Invalid=3754, Unknown=0, NotChecked=0, Total=6806 [2019-02-28 10:11:06,506 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 56 states. [2019-02-28 10:11:06,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:11:06,683 INFO L93 Difference]: Finished difference Result 115 states and 115 transitions. [2019-02-28 10:11:06,684 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-02-28 10:11:06,684 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 108 [2019-02-28 10:11:06,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:11:06,685 INFO L225 Difference]: With dead ends: 115 [2019-02-28 10:11:06,685 INFO L226 Difference]: Without dead ends: 114 [2019-02-28 10:11:06,687 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2862 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=3052, Invalid=3754, Unknown=0, NotChecked=0, Total=6806 [2019-02-28 10:11:06,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-02-28 10:11:06,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2019-02-28 10:11:06,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2019-02-28 10:11:06,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2019-02-28 10:11:06,691 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 108 [2019-02-28 10:11:06,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:11:06,692 INFO L480 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2019-02-28 10:11:06,692 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2019-02-28 10:11:06,692 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2019-02-28 10:11:06,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2019-02-28 10:11:06,692 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:11:06,692 INFO L402 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 1, 1] [2019-02-28 10:11:06,692 INFO L423 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:11:06,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:11:06,693 INFO L82 PathProgramCache]: Analyzing trace with hash 497320169, now seen corresponding path program 27 times [2019-02-28 10:11:06,693 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:11:06,693 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:06,693 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:11:06,693 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:06,694 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:11:06,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:07,240 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:07,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:07,241 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:11:07,241 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:11:07,241 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:11:07,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:07,241 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 [2019-02-28 10:11:07,251 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:11:07,251 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:11:07,283 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:11:07,283 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:11:07,285 INFO L256 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 91 conjunts are in the unsatisfiable core [2019-02-28 10:11:07,287 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:11:07,307 INFO L442 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 [2019-02-28 10:11:07,307 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:11:07,340 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:11:07,340 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:11:07,943 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:07,943 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:11:08,930 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:08,948 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:11:08,948 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 84 [2019-02-28 10:11:08,948 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:11:08,949 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2019-02-28 10:11:08,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2019-02-28 10:11:08,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3277, Invalid=4033, Unknown=0, NotChecked=0, Total=7310 [2019-02-28 10:11:08,950 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 58 states. [2019-02-28 10:11:09,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:11:09,134 INFO L93 Difference]: Finished difference Result 119 states and 119 transitions. [2019-02-28 10:11:09,134 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-02-28 10:11:09,134 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 112 [2019-02-28 10:11:09,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:11:09,136 INFO L225 Difference]: With dead ends: 119 [2019-02-28 10:11:09,136 INFO L226 Difference]: Without dead ends: 118 [2019-02-28 10:11:09,136 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3080 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=3277, Invalid=4033, Unknown=0, NotChecked=0, Total=7310 [2019-02-28 10:11:09,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2019-02-28 10:11:09,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2019-02-28 10:11:09,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2019-02-28 10:11:09,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2019-02-28 10:11:09,141 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 112 [2019-02-28 10:11:09,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:11:09,142 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2019-02-28 10:11:09,142 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2019-02-28 10:11:09,142 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2019-02-28 10:11:09,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2019-02-28 10:11:09,143 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:11:09,143 INFO L402 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 1, 1] [2019-02-28 10:11:09,143 INFO L423 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:11:09,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:11:09,143 INFO L82 PathProgramCache]: Analyzing trace with hash -1001655134, now seen corresponding path program 28 times [2019-02-28 10:11:09,143 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:11:09,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:09,144 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:11:09,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:09,144 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:11:09,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:09,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:09,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:09,698 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:11:09,698 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:11:09,698 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:11:09,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:09,698 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 [2019-02-28 10:11:09,708 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:11:09,708 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:11:09,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:09,742 INFO L256 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 94 conjunts are in the unsatisfiable core [2019-02-28 10:11:09,744 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:11:09,766 INFO L442 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 [2019-02-28 10:11:09,767 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:11:09,861 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:11:09,862 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:11:10,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:10,887 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:11:11,958 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:11,976 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:11:11,976 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 87 [2019-02-28 10:11:11,977 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:11:11,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2019-02-28 10:11:11,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2019-02-28 10:11:11,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3510, Invalid=4322, Unknown=0, NotChecked=0, Total=7832 [2019-02-28 10:11:11,978 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 60 states. [2019-02-28 10:11:12,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:11:12,193 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2019-02-28 10:11:12,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-02-28 10:11:12,193 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 116 [2019-02-28 10:11:12,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:11:12,194 INFO L225 Difference]: With dead ends: 123 [2019-02-28 10:11:12,195 INFO L226 Difference]: Without dead ends: 122 [2019-02-28 10:11:12,196 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3306 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=3510, Invalid=4322, Unknown=0, NotChecked=0, Total=7832 [2019-02-28 10:11:12,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2019-02-28 10:11:12,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2019-02-28 10:11:12,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2019-02-28 10:11:12,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2019-02-28 10:11:12,200 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 116 [2019-02-28 10:11:12,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:11:12,200 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2019-02-28 10:11:12,200 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2019-02-28 10:11:12,200 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2019-02-28 10:11:12,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2019-02-28 10:11:12,201 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:11:12,201 INFO L402 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 1, 1] [2019-02-28 10:11:12,201 INFO L423 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:11:12,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:11:12,202 INFO L82 PathProgramCache]: Analyzing trace with hash 506520539, now seen corresponding path program 29 times [2019-02-28 10:11:12,202 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:11:12,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:12,203 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:11:12,203 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:12,203 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:11:12,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:12,863 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:12,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:12,863 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:11:12,863 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:11:12,863 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:11:12,864 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:12,864 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 [2019-02-28 10:11:12,871 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:11:12,872 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:11:12,953 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2019-02-28 10:11:12,954 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:11:12,957 INFO L256 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 97 conjunts are in the unsatisfiable core [2019-02-28 10:11:12,959 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:11:12,962 INFO L442 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 [2019-02-28 10:11:12,962 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:11:12,972 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:11:12,973 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:11:13,564 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:13,564 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:11:14,740 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:14,759 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:11:14,759 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 90 [2019-02-28 10:11:14,759 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:11:14,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2019-02-28 10:11:14,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2019-02-28 10:11:14,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3751, Invalid=4621, Unknown=0, NotChecked=0, Total=8372 [2019-02-28 10:11:14,761 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 62 states. [2019-02-28 10:11:14,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:11:14,989 INFO L93 Difference]: Finished difference Result 127 states and 127 transitions. [2019-02-28 10:11:14,990 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-02-28 10:11:14,990 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 120 [2019-02-28 10:11:14,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:11:14,991 INFO L225 Difference]: With dead ends: 127 [2019-02-28 10:11:14,991 INFO L226 Difference]: Without dead ends: 126 [2019-02-28 10:11:14,992 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3540 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=3751, Invalid=4621, Unknown=0, NotChecked=0, Total=8372 [2019-02-28 10:11:14,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2019-02-28 10:11:14,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2019-02-28 10:11:14,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2019-02-28 10:11:14,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2019-02-28 10:11:14,996 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 120 [2019-02-28 10:11:14,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:11:14,996 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2019-02-28 10:11:14,996 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2019-02-28 10:11:14,996 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2019-02-28 10:11:14,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2019-02-28 10:11:14,997 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:11:14,997 INFO L402 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 1, 1] [2019-02-28 10:11:14,997 INFO L423 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:11:14,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:11:14,997 INFO L82 PathProgramCache]: Analyzing trace with hash 287936148, now seen corresponding path program 30 times [2019-02-28 10:11:14,997 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:11:14,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:14,998 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:11:14,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:14,998 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:11:15,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:15,972 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 0 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:15,972 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:15,972 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:11:15,972 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:11:15,972 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:11:15,973 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:15,973 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 [2019-02-28 10:11:15,983 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:11:15,984 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:11:16,017 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:11:16,017 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:11:16,019 INFO L256 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 100 conjunts are in the unsatisfiable core [2019-02-28 10:11:16,021 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:11:16,023 INFO L442 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 [2019-02-28 10:11:16,023 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:11:16,034 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:11:16,034 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:11:16,656 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 0 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:16,657 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:11:17,859 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 0 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:17,877 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:11:17,877 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 93 [2019-02-28 10:11:17,877 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:11:17,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2019-02-28 10:11:17,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2019-02-28 10:11:17,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4000, Invalid=4930, Unknown=0, NotChecked=0, Total=8930 [2019-02-28 10:11:17,879 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 64 states. [2019-02-28 10:11:18,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:11:18,105 INFO L93 Difference]: Finished difference Result 131 states and 131 transitions. [2019-02-28 10:11:18,106 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-02-28 10:11:18,106 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 124 [2019-02-28 10:11:18,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:11:18,107 INFO L225 Difference]: With dead ends: 131 [2019-02-28 10:11:18,107 INFO L226 Difference]: Without dead ends: 130 [2019-02-28 10:11:18,108 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3782 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=4000, Invalid=4930, Unknown=0, NotChecked=0, Total=8930 [2019-02-28 10:11:18,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2019-02-28 10:11:18,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2019-02-28 10:11:18,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2019-02-28 10:11:18,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2019-02-28 10:11:18,112 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 124 [2019-02-28 10:11:18,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:11:18,112 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2019-02-28 10:11:18,112 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2019-02-28 10:11:18,112 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2019-02-28 10:11:18,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2019-02-28 10:11:18,113 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:11:18,113 INFO L402 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 1, 1] [2019-02-28 10:11:18,113 INFO L423 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:11:18,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:11:18,113 INFO L82 PathProgramCache]: Analyzing trace with hash 770454733, now seen corresponding path program 31 times [2019-02-28 10:11:18,113 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:11:18,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:18,114 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:11:18,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:18,114 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:11:18,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:18,975 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:18,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:18,976 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:11:18,976 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:11:18,976 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:11:18,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:18,976 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 [2019-02-28 10:11:18,985 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:11:18,985 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:11:19,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:19,025 INFO L256 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 103 conjunts are in the unsatisfiable core [2019-02-28 10:11:19,027 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:11:19,030 INFO L442 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 [2019-02-28 10:11:19,030 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:11:19,038 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:11:19,039 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:11:19,808 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:19,808 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:11:21,369 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:21,388 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:11:21,388 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 96 [2019-02-28 10:11:21,388 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:11:21,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2019-02-28 10:11:21,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2019-02-28 10:11:21,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4257, Invalid=5249, Unknown=0, NotChecked=0, Total=9506 [2019-02-28 10:11:21,390 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand 66 states. [2019-02-28 10:11:21,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:11:21,612 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2019-02-28 10:11:21,612 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-02-28 10:11:21,612 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 128 [2019-02-28 10:11:21,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:11:21,614 INFO L225 Difference]: With dead ends: 135 [2019-02-28 10:11:21,614 INFO L226 Difference]: Without dead ends: 134 [2019-02-28 10:11:21,615 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4032 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=4257, Invalid=5249, Unknown=0, NotChecked=0, Total=9506 [2019-02-28 10:11:21,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2019-02-28 10:11:21,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2019-02-28 10:11:21,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2019-02-28 10:11:21,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2019-02-28 10:11:21,620 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 128 [2019-02-28 10:11:21,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:11:21,621 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2019-02-28 10:11:21,621 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2019-02-28 10:11:21,621 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2019-02-28 10:11:21,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2019-02-28 10:11:21,622 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:11:21,622 INFO L402 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 1, 1] [2019-02-28 10:11:21,622 INFO L423 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:11:21,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:11:21,623 INFO L82 PathProgramCache]: Analyzing trace with hash 1074730630, now seen corresponding path program 32 times [2019-02-28 10:11:21,623 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:11:21,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:21,624 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:11:21,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:21,624 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:11:21,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:22,332 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 0 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:22,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:22,332 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:11:22,332 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:11:22,333 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:11:22,333 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:22,333 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 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 [2019-02-28 10:11:22,341 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:11:22,341 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:11:22,435 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2019-02-28 10:11:22,436 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:11:22,439 INFO L256 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 106 conjunts are in the unsatisfiable core [2019-02-28 10:11:22,440 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:11:22,443 INFO L442 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 [2019-02-28 10:11:22,444 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:11:22,452 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:11:22,452 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:11:23,832 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 0 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:23,832 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:11:25,241 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 0 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:25,259 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:11:25,260 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 99 [2019-02-28 10:11:25,260 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:11:25,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2019-02-28 10:11:25,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2019-02-28 10:11:25,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4522, Invalid=5578, Unknown=0, NotChecked=0, Total=10100 [2019-02-28 10:11:25,262 INFO L87 Difference]: Start difference. First operand 133 states and 133 transitions. Second operand 68 states. [2019-02-28 10:11:25,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:11:25,556 INFO L93 Difference]: Finished difference Result 139 states and 139 transitions. [2019-02-28 10:11:25,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-02-28 10:11:25,557 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 132 [2019-02-28 10:11:25,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:11:25,558 INFO L225 Difference]: With dead ends: 139 [2019-02-28 10:11:25,558 INFO L226 Difference]: Without dead ends: 138 [2019-02-28 10:11:25,558 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 196 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4290 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4522, Invalid=5578, Unknown=0, NotChecked=0, Total=10100 [2019-02-28 10:11:25,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2019-02-28 10:11:25,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 137. [2019-02-28 10:11:25,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2019-02-28 10:11:25,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 137 transitions. [2019-02-28 10:11:25,562 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 137 transitions. Word has length 132 [2019-02-28 10:11:25,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:11:25,563 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 137 transitions. [2019-02-28 10:11:25,563 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2019-02-28 10:11:25,563 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 137 transitions. [2019-02-28 10:11:25,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2019-02-28 10:11:25,564 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:11:25,564 INFO L402 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 1, 1] [2019-02-28 10:11:25,564 INFO L423 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:11:25,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:11:25,564 INFO L82 PathProgramCache]: Analyzing trace with hash -569871425, now seen corresponding path program 33 times [2019-02-28 10:11:25,565 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:11:25,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:25,565 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:11:25,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:25,565 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:11:25,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:26,285 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 0 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:26,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:26,286 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:11:26,286 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:11:26,286 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:11:26,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:26,286 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 [2019-02-28 10:11:26,294 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:11:26,295 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:11:26,336 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:11:26,336 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:11:26,338 INFO L256 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 109 conjunts are in the unsatisfiable core [2019-02-28 10:11:26,341 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:11:26,366 INFO L442 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 [2019-02-28 10:11:26,367 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:11:26,456 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:11:26,457 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:11:27,818 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 0 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:27,818 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:11:29,270 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 0 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:29,289 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:11:29,289 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 102 [2019-02-28 10:11:29,289 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:11:29,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2019-02-28 10:11:29,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2019-02-28 10:11:29,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4795, Invalid=5917, Unknown=0, NotChecked=0, Total=10712 [2019-02-28 10:11:29,291 INFO L87 Difference]: Start difference. First operand 137 states and 137 transitions. Second operand 70 states. [2019-02-28 10:11:29,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:11:29,586 INFO L93 Difference]: Finished difference Result 143 states and 143 transitions. [2019-02-28 10:11:29,587 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-02-28 10:11:29,587 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 136 [2019-02-28 10:11:29,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:11:29,588 INFO L225 Difference]: With dead ends: 143 [2019-02-28 10:11:29,588 INFO L226 Difference]: Without dead ends: 142 [2019-02-28 10:11:29,589 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4556 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4795, Invalid=5917, Unknown=0, NotChecked=0, Total=10712 [2019-02-28 10:11:29,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2019-02-28 10:11:29,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2019-02-28 10:11:29,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2019-02-28 10:11:29,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 141 transitions. [2019-02-28 10:11:29,593 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 141 transitions. Word has length 136 [2019-02-28 10:11:29,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:11:29,593 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 141 transitions. [2019-02-28 10:11:29,593 INFO L481 AbstractCegarLoop]: Interpolant automaton has 70 states. [2019-02-28 10:11:29,594 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 141 transitions. [2019-02-28 10:11:29,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2019-02-28 10:11:29,594 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:11:29,594 INFO L402 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 1, 1] [2019-02-28 10:11:29,594 INFO L423 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:11:29,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:11:29,595 INFO L82 PathProgramCache]: Analyzing trace with hash -114389896, now seen corresponding path program 34 times [2019-02-28 10:11:29,595 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:11:29,595 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:29,595 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:11:29,595 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:29,596 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:11:29,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:30,737 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 0 proven. 2346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:30,737 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:30,737 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:11:30,738 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:11:30,738 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:11:30,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:30,738 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 [2019-02-28 10:11:30,746 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:11:30,746 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:11:30,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:30,788 INFO L256 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 112 conjunts are in the unsatisfiable core [2019-02-28 10:11:30,790 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:11:30,807 INFO L442 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 [2019-02-28 10:11:30,807 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:11:30,831 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:11:30,831 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:11:31,932 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 0 proven. 2346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:31,933 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:11:33,529 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 0 proven. 2346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:33,549 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:11:33,549 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 105 [2019-02-28 10:11:33,549 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:11:33,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 72 states [2019-02-28 10:11:33,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2019-02-28 10:11:33,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5076, Invalid=6266, Unknown=0, NotChecked=0, Total=11342 [2019-02-28 10:11:33,551 INFO L87 Difference]: Start difference. First operand 141 states and 141 transitions. Second operand 72 states. [2019-02-28 10:11:33,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:11:33,983 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2019-02-28 10:11:33,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-02-28 10:11:33,983 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 140 [2019-02-28 10:11:33,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:11:33,985 INFO L225 Difference]: With dead ends: 147 [2019-02-28 10:11:33,985 INFO L226 Difference]: Without dead ends: 146 [2019-02-28 10:11:33,986 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 208 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4830 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=5076, Invalid=6266, Unknown=0, NotChecked=0, Total=11342 [2019-02-28 10:11:33,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2019-02-28 10:11:33,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2019-02-28 10:11:33,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2019-02-28 10:11:33,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 145 transitions. [2019-02-28 10:11:33,990 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 145 transitions. Word has length 140 [2019-02-28 10:11:33,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:11:33,991 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 145 transitions. [2019-02-28 10:11:33,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has 72 states. [2019-02-28 10:11:33,991 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 145 transitions. [2019-02-28 10:11:33,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2019-02-28 10:11:33,992 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:11:33,992 INFO L402 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 1, 1] [2019-02-28 10:11:33,992 INFO L423 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:11:33,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:11:33,992 INFO L82 PathProgramCache]: Analyzing trace with hash 1840750769, now seen corresponding path program 35 times [2019-02-28 10:11:33,992 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:11:33,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:33,993 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:11:33,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:33,993 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:11:34,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:34,742 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 0 proven. 2485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:34,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:34,742 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:11:34,743 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:11:34,743 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:11:34,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:34,743 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 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 [2019-02-28 10:11:34,751 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:11:34,751 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:11:34,875 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2019-02-28 10:11:34,875 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:11:34,878 INFO L256 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 115 conjunts are in the unsatisfiable core [2019-02-28 10:11:34,880 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:11:34,883 INFO L442 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 [2019-02-28 10:11:34,883 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:11:34,898 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:11:34,898 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:11:35,991 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 0 proven. 2485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:35,991 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:11:37,586 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 0 proven. 2485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:37,604 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:11:37,605 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 108 [2019-02-28 10:11:37,605 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:11:37,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2019-02-28 10:11:37,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2019-02-28 10:11:37,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5365, Invalid=6625, Unknown=0, NotChecked=0, Total=11990 [2019-02-28 10:11:37,606 INFO L87 Difference]: Start difference. First operand 145 states and 145 transitions. Second operand 74 states. [2019-02-28 10:11:38,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:11:38,077 INFO L93 Difference]: Finished difference Result 151 states and 151 transitions. [2019-02-28 10:11:38,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-02-28 10:11:38,077 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 144 [2019-02-28 10:11:38,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:11:38,078 INFO L225 Difference]: With dead ends: 151 [2019-02-28 10:11:38,078 INFO L226 Difference]: Without dead ends: 150 [2019-02-28 10:11:38,079 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 214 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5112 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=5365, Invalid=6625, Unknown=0, NotChecked=0, Total=11990 [2019-02-28 10:11:38,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2019-02-28 10:11:38,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2019-02-28 10:11:38,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2019-02-28 10:11:38,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 149 transitions. [2019-02-28 10:11:38,084 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 149 transitions. Word has length 144 [2019-02-28 10:11:38,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:11:38,085 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 149 transitions. [2019-02-28 10:11:38,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2019-02-28 10:11:38,085 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 149 transitions. [2019-02-28 10:11:38,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2019-02-28 10:11:38,086 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:11:38,086 INFO L402 BasicCegarLoop]: trace histogram [37, 37, 36, 36, 1, 1] [2019-02-28 10:11:38,086 INFO L423 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:11:38,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:11:38,087 INFO L82 PathProgramCache]: Analyzing trace with hash -1833308054, now seen corresponding path program 36 times [2019-02-28 10:11:38,087 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:11:38,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:38,087 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:11:38,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:38,088 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:11:38,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:39,502 INFO L134 CoverageAnalysis]: Checked inductivity of 2628 backedges. 0 proven. 2628 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:39,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:39,502 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:11:39,503 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:11:39,503 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:11:39,503 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:39,503 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 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 [2019-02-28 10:11:39,519 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:11:39,519 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:11:39,578 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:11:39,578 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:11:39,581 INFO L256 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 118 conjunts are in the unsatisfiable core [2019-02-28 10:11:39,583 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:11:39,600 INFO L442 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 [2019-02-28 10:11:39,601 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:11:39,691 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:11:39,692 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:11:41,207 INFO L134 CoverageAnalysis]: Checked inductivity of 2628 backedges. 0 proven. 2628 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:41,208 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:11:42,883 INFO L134 CoverageAnalysis]: Checked inductivity of 2628 backedges. 0 proven. 2628 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:42,915 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:11:42,915 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 111 [2019-02-28 10:11:42,915 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:11:42,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 76 states [2019-02-28 10:11:42,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2019-02-28 10:11:42,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5662, Invalid=6994, Unknown=0, NotChecked=0, Total=12656 [2019-02-28 10:11:42,918 INFO L87 Difference]: Start difference. First operand 149 states and 149 transitions. Second operand 76 states. [2019-02-28 10:11:43,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:11:43,223 INFO L93 Difference]: Finished difference Result 155 states and 155 transitions. [2019-02-28 10:11:43,223 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-02-28 10:11:43,223 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 148 [2019-02-28 10:11:43,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:11:43,225 INFO L225 Difference]: With dead ends: 155 [2019-02-28 10:11:43,225 INFO L226 Difference]: Without dead ends: 154 [2019-02-28 10:11:43,226 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5402 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=5662, Invalid=6994, Unknown=0, NotChecked=0, Total=12656 [2019-02-28 10:11:43,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2019-02-28 10:11:43,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2019-02-28 10:11:43,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2019-02-28 10:11:43,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 153 transitions. [2019-02-28 10:11:43,231 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 153 transitions. Word has length 148 [2019-02-28 10:11:43,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:11:43,232 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 153 transitions. [2019-02-28 10:11:43,232 INFO L481 AbstractCegarLoop]: Interpolant automaton has 76 states. [2019-02-28 10:11:43,232 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 153 transitions. [2019-02-28 10:11:43,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2019-02-28 10:11:43,233 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:11:43,233 INFO L402 BasicCegarLoop]: trace histogram [38, 38, 37, 37, 1, 1] [2019-02-28 10:11:43,233 INFO L423 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:11:43,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:11:43,234 INFO L82 PathProgramCache]: Analyzing trace with hash -903103581, now seen corresponding path program 37 times [2019-02-28 10:11:43,234 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:11:43,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:43,234 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:11:43,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:43,235 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:11:43,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:44,647 INFO L134 CoverageAnalysis]: Checked inductivity of 2775 backedges. 0 proven. 2775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:44,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:44,648 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:11:44,648 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:11:44,648 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:11:44,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:44,648 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 [2019-02-28 10:11:44,656 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:11:44,656 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:11:44,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:44,701 INFO L256 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 121 conjunts are in the unsatisfiable core [2019-02-28 10:11:44,704 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:11:44,717 INFO L442 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 [2019-02-28 10:11:44,717 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:11:44,729 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:11:44,730 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:11:45,637 INFO L134 CoverageAnalysis]: Checked inductivity of 2775 backedges. 0 proven. 2775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:45,637 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:11:47,661 INFO L134 CoverageAnalysis]: Checked inductivity of 2775 backedges. 0 proven. 2775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:47,680 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:11:47,680 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 114 [2019-02-28 10:11:47,680 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:11:47,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 78 states [2019-02-28 10:11:47,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2019-02-28 10:11:47,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5967, Invalid=7373, Unknown=0, NotChecked=0, Total=13340 [2019-02-28 10:11:47,682 INFO L87 Difference]: Start difference. First operand 153 states and 153 transitions. Second operand 78 states. [2019-02-28 10:11:47,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:11:47,989 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2019-02-28 10:11:47,990 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2019-02-28 10:11:47,990 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 152 [2019-02-28 10:11:47,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:11:47,991 INFO L225 Difference]: With dead ends: 159 [2019-02-28 10:11:47,991 INFO L226 Difference]: Without dead ends: 158 [2019-02-28 10:11:47,992 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 226 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5700 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=5967, Invalid=7373, Unknown=0, NotChecked=0, Total=13340 [2019-02-28 10:11:47,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2019-02-28 10:11:47,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 157. [2019-02-28 10:11:47,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2019-02-28 10:11:47,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 157 transitions. [2019-02-28 10:11:47,996 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 157 transitions. Word has length 152 [2019-02-28 10:11:47,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:11:47,997 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 157 transitions. [2019-02-28 10:11:47,997 INFO L481 AbstractCegarLoop]: Interpolant automaton has 78 states. [2019-02-28 10:11:47,997 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 157 transitions. [2019-02-28 10:11:47,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2019-02-28 10:11:47,998 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:11:47,998 INFO L402 BasicCegarLoop]: trace histogram [39, 39, 38, 38, 1, 1] [2019-02-28 10:11:47,998 INFO L423 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:11:47,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:11:47,998 INFO L82 PathProgramCache]: Analyzing trace with hash 283329116, now seen corresponding path program 38 times [2019-02-28 10:11:47,998 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:11:47,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:47,999 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:11:47,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:47,999 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:11:48,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:48,948 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:48,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:48,948 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:11:48,948 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:11:48,948 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:11:48,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:48,949 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 [2019-02-28 10:11:48,957 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:11:48,958 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:11:49,075 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2019-02-28 10:11:49,075 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:11:49,078 INFO L256 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 124 conjunts are in the unsatisfiable core [2019-02-28 10:11:49,080 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:11:49,082 INFO L442 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 [2019-02-28 10:11:49,082 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:11:49,091 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:11:49,091 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:11:50,048 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:50,048 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:11:52,219 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:52,246 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:11:52,246 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 117 [2019-02-28 10:11:52,246 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:11:52,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2019-02-28 10:11:52,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2019-02-28 10:11:52,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6280, Invalid=7762, Unknown=0, NotChecked=0, Total=14042 [2019-02-28 10:11:52,247 INFO L87 Difference]: Start difference. First operand 157 states and 157 transitions. Second operand 80 states. [2019-02-28 10:11:52,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:11:52,570 INFO L93 Difference]: Finished difference Result 163 states and 163 transitions. [2019-02-28 10:11:52,570 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2019-02-28 10:11:52,570 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 156 [2019-02-28 10:11:52,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:11:52,571 INFO L225 Difference]: With dead ends: 163 [2019-02-28 10:11:52,572 INFO L226 Difference]: Without dead ends: 162 [2019-02-28 10:11:52,573 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 232 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6006 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=6280, Invalid=7762, Unknown=0, NotChecked=0, Total=14042 [2019-02-28 10:11:52,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2019-02-28 10:11:52,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 161. [2019-02-28 10:11:52,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2019-02-28 10:11:52,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 161 transitions. [2019-02-28 10:11:52,578 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 161 transitions. Word has length 156 [2019-02-28 10:11:52,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:11:52,578 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 161 transitions. [2019-02-28 10:11:52,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2019-02-28 10:11:52,578 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 161 transitions. [2019-02-28 10:11:52,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2019-02-28 10:11:52,579 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:11:52,579 INFO L402 BasicCegarLoop]: trace histogram [40, 40, 39, 39, 1, 1] [2019-02-28 10:11:52,579 INFO L423 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:11:52,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:11:52,580 INFO L82 PathProgramCache]: Analyzing trace with hash -1902721899, now seen corresponding path program 39 times [2019-02-28 10:11:52,580 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:11:52,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:52,580 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:11:52,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:52,581 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:11:52,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:54,134 INFO L134 CoverageAnalysis]: Checked inductivity of 3081 backedges. 0 proven. 3081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:54,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:54,135 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:11:54,135 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:11:54,135 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:11:54,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:54,135 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 [2019-02-28 10:11:54,143 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:11:54,143 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:11:54,188 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:11:54,188 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:11:54,190 INFO L256 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 127 conjunts are in the unsatisfiable core [2019-02-28 10:11:54,192 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:11:54,196 INFO L442 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 [2019-02-28 10:11:54,196 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:11:54,208 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:11:54,208 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:11:55,265 INFO L134 CoverageAnalysis]: Checked inductivity of 3081 backedges. 0 proven. 3081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:55,265 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:11:57,499 INFO L134 CoverageAnalysis]: Checked inductivity of 3081 backedges. 0 proven. 3081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:57,519 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:11:57,519 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 120 [2019-02-28 10:11:57,519 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:11:57,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 82 states [2019-02-28 10:11:57,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2019-02-28 10:11:57,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6601, Invalid=8161, Unknown=0, NotChecked=0, Total=14762 [2019-02-28 10:11:57,521 INFO L87 Difference]: Start difference. First operand 161 states and 161 transitions. Second operand 82 states. [2019-02-28 10:11:58,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:11:58,027 INFO L93 Difference]: Finished difference Result 167 states and 167 transitions. [2019-02-28 10:11:58,028 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-02-28 10:11:58,028 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 160 [2019-02-28 10:11:58,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:11:58,029 INFO L225 Difference]: With dead ends: 167 [2019-02-28 10:11:58,029 INFO L226 Difference]: Without dead ends: 166 [2019-02-28 10:11:58,030 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 238 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6320 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=6601, Invalid=8161, Unknown=0, NotChecked=0, Total=14762 [2019-02-28 10:11:58,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2019-02-28 10:11:58,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2019-02-28 10:11:58,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2019-02-28 10:11:58,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 165 transitions. [2019-02-28 10:11:58,035 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 165 transitions. Word has length 160 [2019-02-28 10:11:58,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:11:58,036 INFO L480 AbstractCegarLoop]: Abstraction has 165 states and 165 transitions. [2019-02-28 10:11:58,036 INFO L481 AbstractCegarLoop]: Interpolant automaton has 82 states. [2019-02-28 10:11:58,036 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 165 transitions. [2019-02-28 10:11:58,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2019-02-28 10:11:58,037 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:11:58,037 INFO L402 BasicCegarLoop]: trace histogram [41, 41, 40, 40, 1, 1] [2019-02-28 10:11:58,037 INFO L423 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:11:58,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:11:58,037 INFO L82 PathProgramCache]: Analyzing trace with hash 635208270, now seen corresponding path program 40 times [2019-02-28 10:11:58,037 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:11:58,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:58,038 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:11:58,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:11:58,038 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:11:58,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:59,007 INFO L134 CoverageAnalysis]: Checked inductivity of 3240 backedges. 0 proven. 3240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:11:59,007 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:59,007 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:11:59,007 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:11:59,007 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:11:59,007 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:11:59,007 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 [2019-02-28 10:11:59,015 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:11:59,015 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:11:59,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:11:59,058 INFO L256 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 130 conjunts are in the unsatisfiable core [2019-02-28 10:11:59,061 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:11:59,094 INFO L442 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 [2019-02-28 10:11:59,095 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:11:59,157 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:11:59,158 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:12:00,233 INFO L134 CoverageAnalysis]: Checked inductivity of 3240 backedges. 0 proven. 3240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:00,233 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:12:02,609 INFO L134 CoverageAnalysis]: Checked inductivity of 3240 backedges. 0 proven. 3240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:02,627 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:12:02,628 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 123 [2019-02-28 10:12:02,628 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:12:02,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 84 states [2019-02-28 10:12:02,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2019-02-28 10:12:02,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6930, Invalid=8570, Unknown=0, NotChecked=0, Total=15500 [2019-02-28 10:12:02,629 INFO L87 Difference]: Start difference. First operand 165 states and 165 transitions. Second operand 84 states. [2019-02-28 10:12:02,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:12:02,907 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2019-02-28 10:12:02,907 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2019-02-28 10:12:02,907 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 164 [2019-02-28 10:12:02,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:12:02,909 INFO L225 Difference]: With dead ends: 171 [2019-02-28 10:12:02,909 INFO L226 Difference]: Without dead ends: 170 [2019-02-28 10:12:02,909 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 244 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6642 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=6930, Invalid=8570, Unknown=0, NotChecked=0, Total=15500 [2019-02-28 10:12:02,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2019-02-28 10:12:02,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2019-02-28 10:12:02,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2019-02-28 10:12:02,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 169 transitions. [2019-02-28 10:12:02,914 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 169 transitions. Word has length 164 [2019-02-28 10:12:02,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:12:02,914 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 169 transitions. [2019-02-28 10:12:02,914 INFO L481 AbstractCegarLoop]: Interpolant automaton has 84 states. [2019-02-28 10:12:02,914 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 169 transitions. [2019-02-28 10:12:02,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2019-02-28 10:12:02,915 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:12:02,915 INFO L402 BasicCegarLoop]: trace histogram [42, 42, 41, 41, 1, 1] [2019-02-28 10:12:02,915 INFO L423 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:12:02,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:12:02,916 INFO L82 PathProgramCache]: Analyzing trace with hash 69909383, now seen corresponding path program 41 times [2019-02-28 10:12:02,916 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:12:02,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:02,917 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:12:02,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:02,917 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:12:02,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:12:03,877 INFO L134 CoverageAnalysis]: Checked inductivity of 3403 backedges. 0 proven. 3403 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:03,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:03,877 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:12:03,877 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:12:03,877 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:12:03,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:03,878 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 [2019-02-28 10:12:03,887 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:12:03,887 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:12:04,019 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2019-02-28 10:12:04,020 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:12:04,022 INFO L256 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 133 conjunts are in the unsatisfiable core [2019-02-28 10:12:04,026 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:12:04,046 INFO L442 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 [2019-02-28 10:12:04,047 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:12:04,136 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:12:04,137 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:12:05,351 INFO L134 CoverageAnalysis]: Checked inductivity of 3403 backedges. 0 proven. 3403 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:05,351 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:12:07,886 INFO L134 CoverageAnalysis]: Checked inductivity of 3403 backedges. 0 proven. 3403 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:07,906 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:12:07,906 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 126 [2019-02-28 10:12:07,906 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:12:07,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2019-02-28 10:12:07,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2019-02-28 10:12:07,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7267, Invalid=8989, Unknown=0, NotChecked=0, Total=16256 [2019-02-28 10:12:07,908 INFO L87 Difference]: Start difference. First operand 169 states and 169 transitions. Second operand 86 states. [2019-02-28 10:12:08,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:12:08,179 INFO L93 Difference]: Finished difference Result 175 states and 175 transitions. [2019-02-28 10:12:08,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-02-28 10:12:08,179 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 168 [2019-02-28 10:12:08,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:12:08,181 INFO L225 Difference]: With dead ends: 175 [2019-02-28 10:12:08,181 INFO L226 Difference]: Without dead ends: 174 [2019-02-28 10:12:08,182 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 250 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6972 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=7267, Invalid=8989, Unknown=0, NotChecked=0, Total=16256 [2019-02-28 10:12:08,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2019-02-28 10:12:08,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 173. [2019-02-28 10:12:08,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2019-02-28 10:12:08,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 173 transitions. [2019-02-28 10:12:08,187 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 173 transitions. Word has length 168 [2019-02-28 10:12:08,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:12:08,187 INFO L480 AbstractCegarLoop]: Abstraction has 173 states and 173 transitions. [2019-02-28 10:12:08,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2019-02-28 10:12:08,188 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 173 transitions. [2019-02-28 10:12:08,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2019-02-28 10:12:08,188 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:12:08,189 INFO L402 BasicCegarLoop]: trace histogram [43, 43, 42, 42, 1, 1] [2019-02-28 10:12:08,189 INFO L423 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:12:08,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:12:08,189 INFO L82 PathProgramCache]: Analyzing trace with hash 836218944, now seen corresponding path program 42 times [2019-02-28 10:12:08,189 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:12:08,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:08,190 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:12:08,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:08,190 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:12:08,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:12:09,469 INFO L134 CoverageAnalysis]: Checked inductivity of 3570 backedges. 0 proven. 3570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:09,469 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:09,469 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:12:09,469 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:12:09,469 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:12:09,469 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:09,469 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 [2019-02-28 10:12:09,479 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:12:09,480 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:12:09,530 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:12:09,530 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:12:09,533 INFO L256 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 136 conjunts are in the unsatisfiable core [2019-02-28 10:12:09,536 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:12:09,540 INFO L442 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 [2019-02-28 10:12:09,541 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:12:09,554 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:12:09,554 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:12:10,685 INFO L134 CoverageAnalysis]: Checked inductivity of 3570 backedges. 0 proven. 3570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:10,686 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:12:13,110 INFO L134 CoverageAnalysis]: Checked inductivity of 3570 backedges. 0 proven. 3570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:13,128 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:12:13,128 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 129 [2019-02-28 10:12:13,128 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:12:13,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 88 states [2019-02-28 10:12:13,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2019-02-28 10:12:13,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7612, Invalid=9418, Unknown=0, NotChecked=0, Total=17030 [2019-02-28 10:12:13,131 INFO L87 Difference]: Start difference. First operand 173 states and 173 transitions. Second operand 88 states. [2019-02-28 10:12:13,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:12:13,703 INFO L93 Difference]: Finished difference Result 179 states and 179 transitions. [2019-02-28 10:12:13,704 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2019-02-28 10:12:13,704 INFO L78 Accepts]: Start accepts. Automaton has 88 states. Word has length 172 [2019-02-28 10:12:13,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:12:13,705 INFO L225 Difference]: With dead ends: 179 [2019-02-28 10:12:13,705 INFO L226 Difference]: Without dead ends: 178 [2019-02-28 10:12:13,707 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 385 GetRequests, 256 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7310 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=7612, Invalid=9418, Unknown=0, NotChecked=0, Total=17030 [2019-02-28 10:12:13,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2019-02-28 10:12:13,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 177. [2019-02-28 10:12:13,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2019-02-28 10:12:13,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 177 transitions. [2019-02-28 10:12:13,712 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 177 transitions. Word has length 172 [2019-02-28 10:12:13,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:12:13,712 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 177 transitions. [2019-02-28 10:12:13,712 INFO L481 AbstractCegarLoop]: Interpolant automaton has 88 states. [2019-02-28 10:12:13,712 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 177 transitions. [2019-02-28 10:12:13,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2019-02-28 10:12:13,713 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:12:13,713 INFO L402 BasicCegarLoop]: trace histogram [44, 44, 43, 43, 1, 1] [2019-02-28 10:12:13,714 INFO L423 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:12:13,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:12:13,714 INFO L82 PathProgramCache]: Analyzing trace with hash 572104825, now seen corresponding path program 43 times [2019-02-28 10:12:13,714 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:12:13,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:13,715 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:12:13,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:13,715 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:12:13,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:12:15,299 INFO L134 CoverageAnalysis]: Checked inductivity of 3741 backedges. 0 proven. 3741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:15,300 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:15,300 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:12:15,300 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:12:15,300 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:12:15,300 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:15,300 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 [2019-02-28 10:12:15,309 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:12:15,309 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:12:15,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:12:15,360 INFO L256 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 139 conjunts are in the unsatisfiable core [2019-02-28 10:12:15,362 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:12:15,366 INFO L442 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 [2019-02-28 10:12:15,367 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:12:15,383 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:12:15,384 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:12:16,691 INFO L134 CoverageAnalysis]: Checked inductivity of 3741 backedges. 0 proven. 3741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:16,692 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:12:19,185 INFO L134 CoverageAnalysis]: Checked inductivity of 3741 backedges. 0 proven. 3741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:19,204 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:12:19,205 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 132 [2019-02-28 10:12:19,205 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:12:19,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 90 states [2019-02-28 10:12:19,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2019-02-28 10:12:19,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7965, Invalid=9857, Unknown=0, NotChecked=0, Total=17822 [2019-02-28 10:12:19,206 INFO L87 Difference]: Start difference. First operand 177 states and 177 transitions. Second operand 90 states. [2019-02-28 10:12:19,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:12:19,505 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2019-02-28 10:12:19,506 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-02-28 10:12:19,506 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 176 [2019-02-28 10:12:19,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:12:19,507 INFO L225 Difference]: With dead ends: 183 [2019-02-28 10:12:19,507 INFO L226 Difference]: Without dead ends: 182 [2019-02-28 10:12:19,508 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 262 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7656 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=7965, Invalid=9857, Unknown=0, NotChecked=0, Total=17822 [2019-02-28 10:12:19,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2019-02-28 10:12:19,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2019-02-28 10:12:19,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2019-02-28 10:12:19,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 181 transitions. [2019-02-28 10:12:19,512 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 181 transitions. Word has length 176 [2019-02-28 10:12:19,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:12:19,513 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 181 transitions. [2019-02-28 10:12:19,513 INFO L481 AbstractCegarLoop]: Interpolant automaton has 90 states. [2019-02-28 10:12:19,513 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 181 transitions. [2019-02-28 10:12:19,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2019-02-28 10:12:19,513 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:12:19,513 INFO L402 BasicCegarLoop]: trace histogram [45, 45, 44, 44, 1, 1] [2019-02-28 10:12:19,514 INFO L423 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:12:19,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:12:19,514 INFO L82 PathProgramCache]: Analyzing trace with hash 1124518962, now seen corresponding path program 44 times [2019-02-28 10:12:19,514 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:12:19,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:19,514 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:12:19,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:19,515 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:12:19,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:12:20,727 INFO L134 CoverageAnalysis]: Checked inductivity of 3916 backedges. 0 proven. 3916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:20,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:20,728 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:12:20,728 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:12:20,728 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:12:20,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:20,728 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 [2019-02-28 10:12:20,736 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:12:20,737 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:12:20,887 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2019-02-28 10:12:20,887 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:12:20,890 INFO L256 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 142 conjunts are in the unsatisfiable core [2019-02-28 10:12:20,892 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:12:20,898 INFO L442 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 [2019-02-28 10:12:20,899 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:12:20,906 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:12:20,906 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:12:22,388 INFO L134 CoverageAnalysis]: Checked inductivity of 3916 backedges. 0 proven. 3916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:22,388 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:12:24,911 INFO L134 CoverageAnalysis]: Checked inductivity of 3916 backedges. 0 proven. 3916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:24,931 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:12:24,931 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 135 [2019-02-28 10:12:24,931 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:12:24,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2019-02-28 10:12:24,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2019-02-28 10:12:24,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8326, Invalid=10306, Unknown=0, NotChecked=0, Total=18632 [2019-02-28 10:12:24,933 INFO L87 Difference]: Start difference. First operand 181 states and 181 transitions. Second operand 92 states. [2019-02-28 10:12:25,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:12:25,284 INFO L93 Difference]: Finished difference Result 187 states and 187 transitions. [2019-02-28 10:12:25,284 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-02-28 10:12:25,284 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 180 [2019-02-28 10:12:25,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:12:25,286 INFO L225 Difference]: With dead ends: 187 [2019-02-28 10:12:25,286 INFO L226 Difference]: Without dead ends: 186 [2019-02-28 10:12:25,287 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 268 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8010 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=8326, Invalid=10306, Unknown=0, NotChecked=0, Total=18632 [2019-02-28 10:12:25,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2019-02-28 10:12:25,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 185. [2019-02-28 10:12:25,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 185 states. [2019-02-28 10:12:25,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 185 transitions. [2019-02-28 10:12:25,292 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 185 transitions. Word has length 180 [2019-02-28 10:12:25,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:12:25,293 INFO L480 AbstractCegarLoop]: Abstraction has 185 states and 185 transitions. [2019-02-28 10:12:25,293 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2019-02-28 10:12:25,293 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 185 transitions. [2019-02-28 10:12:25,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2019-02-28 10:12:25,294 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:12:25,294 INFO L402 BasicCegarLoop]: trace histogram [46, 46, 45, 45, 1, 1] [2019-02-28 10:12:25,294 INFO L423 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:12:25,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:12:25,294 INFO L82 PathProgramCache]: Analyzing trace with hash -1919585429, now seen corresponding path program 45 times [2019-02-28 10:12:25,295 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:12:25,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:25,295 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:12:25,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:25,296 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:12:25,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:12:26,472 INFO L134 CoverageAnalysis]: Checked inductivity of 4095 backedges. 0 proven. 4095 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:26,472 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:26,472 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:12:26,472 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:12:26,472 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:12:26,472 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:26,473 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 [2019-02-28 10:12:26,484 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:12:26,484 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:12:26,532 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:12:26,532 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:12:26,535 INFO L256 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 145 conjunts are in the unsatisfiable core [2019-02-28 10:12:26,538 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:12:26,540 INFO L442 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 [2019-02-28 10:12:26,541 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:12:26,551 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:12:26,551 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:12:28,064 INFO L134 CoverageAnalysis]: Checked inductivity of 4095 backedges. 0 proven. 4095 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:28,064 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:12:30,770 INFO L134 CoverageAnalysis]: Checked inductivity of 4095 backedges. 0 proven. 4095 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:30,789 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:12:30,789 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 138 [2019-02-28 10:12:30,789 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:12:30,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 94 states [2019-02-28 10:12:30,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2019-02-28 10:12:30,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8695, Invalid=10765, Unknown=0, NotChecked=0, Total=19460 [2019-02-28 10:12:30,791 INFO L87 Difference]: Start difference. First operand 185 states and 185 transitions. Second operand 94 states. [2019-02-28 10:12:31,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:12:31,105 INFO L93 Difference]: Finished difference Result 191 states and 191 transitions. [2019-02-28 10:12:31,105 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2019-02-28 10:12:31,106 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 184 [2019-02-28 10:12:31,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:12:31,107 INFO L225 Difference]: With dead ends: 191 [2019-02-28 10:12:31,107 INFO L226 Difference]: Without dead ends: 190 [2019-02-28 10:12:31,108 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 274 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8372 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=8695, Invalid=10765, Unknown=0, NotChecked=0, Total=19460 [2019-02-28 10:12:31,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2019-02-28 10:12:31,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 189. [2019-02-28 10:12:31,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2019-02-28 10:12:31,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 189 transitions. [2019-02-28 10:12:31,113 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 189 transitions. Word has length 184 [2019-02-28 10:12:31,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:12:31,113 INFO L480 AbstractCegarLoop]: Abstraction has 189 states and 189 transitions. [2019-02-28 10:12:31,114 INFO L481 AbstractCegarLoop]: Interpolant automaton has 94 states. [2019-02-28 10:12:31,114 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 189 transitions. [2019-02-28 10:12:31,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2019-02-28 10:12:31,115 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:12:31,115 INFO L402 BasicCegarLoop]: trace histogram [47, 47, 46, 46, 1, 1] [2019-02-28 10:12:31,115 INFO L423 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:12:31,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:12:31,115 INFO L82 PathProgramCache]: Analyzing trace with hash 362534436, now seen corresponding path program 46 times [2019-02-28 10:12:31,115 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:12:31,116 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:31,116 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:12:31,116 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:31,116 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:12:31,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:12:33,104 INFO L134 CoverageAnalysis]: Checked inductivity of 4278 backedges. 0 proven. 4278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:33,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:33,104 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:12:33,104 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:12:33,104 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:12:33,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:33,104 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 [2019-02-28 10:12:33,115 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:12:33,115 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:12:33,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:12:33,170 INFO L256 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 148 conjunts are in the unsatisfiable core [2019-02-28 10:12:33,172 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:12:33,192 INFO L442 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 [2019-02-28 10:12:33,193 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:12:33,290 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:12:33,290 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:12:35,277 INFO L134 CoverageAnalysis]: Checked inductivity of 4278 backedges. 0 proven. 4278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:35,278 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:12:38,737 INFO L134 CoverageAnalysis]: Checked inductivity of 4278 backedges. 0 proven. 4278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:38,755 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:12:38,755 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 141 [2019-02-28 10:12:38,755 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:12:38,756 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2019-02-28 10:12:38,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2019-02-28 10:12:38,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9072, Invalid=11234, Unknown=0, NotChecked=0, Total=20306 [2019-02-28 10:12:38,757 INFO L87 Difference]: Start difference. First operand 189 states and 189 transitions. Second operand 96 states. [2019-02-28 10:12:39,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:12:39,110 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2019-02-28 10:12:39,111 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2019-02-28 10:12:39,111 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 188 [2019-02-28 10:12:39,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:12:39,113 INFO L225 Difference]: With dead ends: 195 [2019-02-28 10:12:39,113 INFO L226 Difference]: Without dead ends: 194 [2019-02-28 10:12:39,114 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 280 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8742 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=9072, Invalid=11234, Unknown=0, NotChecked=0, Total=20306 [2019-02-28 10:12:39,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2019-02-28 10:12:39,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2019-02-28 10:12:39,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2019-02-28 10:12:39,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 193 transitions. [2019-02-28 10:12:39,119 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 193 transitions. Word has length 188 [2019-02-28 10:12:39,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:12:39,119 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 193 transitions. [2019-02-28 10:12:39,119 INFO L481 AbstractCegarLoop]: Interpolant automaton has 96 states. [2019-02-28 10:12:39,119 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 193 transitions. [2019-02-28 10:12:39,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2019-02-28 10:12:39,120 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:12:39,121 INFO L402 BasicCegarLoop]: trace histogram [48, 48, 47, 47, 1, 1] [2019-02-28 10:12:39,121 INFO L423 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:12:39,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:12:39,121 INFO L82 PathProgramCache]: Analyzing trace with hash -1714408355, now seen corresponding path program 47 times [2019-02-28 10:12:39,121 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:12:39,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:39,122 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:12:39,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:39,122 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:12:39,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:12:40,387 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:40,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:40,387 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:12:40,387 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:12:40,387 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:12:40,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:40,388 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 [2019-02-28 10:12:40,396 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:12:40,396 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:12:40,563 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2019-02-28 10:12:40,563 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:12:40,566 INFO L256 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 151 conjunts are in the unsatisfiable core [2019-02-28 10:12:40,569 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:12:40,587 INFO L442 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 [2019-02-28 10:12:40,588 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:12:40,679 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:12:40,679 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:12:42,070 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:42,070 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:12:45,116 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:45,135 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:12:45,135 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 144 [2019-02-28 10:12:45,135 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:12:45,135 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2019-02-28 10:12:45,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2019-02-28 10:12:45,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9457, Invalid=11713, Unknown=0, NotChecked=0, Total=21170 [2019-02-28 10:12:45,137 INFO L87 Difference]: Start difference. First operand 193 states and 193 transitions. Second operand 98 states. [2019-02-28 10:12:45,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:12:45,471 INFO L93 Difference]: Finished difference Result 199 states and 199 transitions. [2019-02-28 10:12:45,471 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2019-02-28 10:12:45,471 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 192 [2019-02-28 10:12:45,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:12:45,472 INFO L225 Difference]: With dead ends: 199 [2019-02-28 10:12:45,473 INFO L226 Difference]: Without dead ends: 198 [2019-02-28 10:12:45,474 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 286 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9120 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=9457, Invalid=11713, Unknown=0, NotChecked=0, Total=21170 [2019-02-28 10:12:45,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2019-02-28 10:12:45,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 197. [2019-02-28 10:12:45,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2019-02-28 10:12:45,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 197 transitions. [2019-02-28 10:12:45,479 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 197 transitions. Word has length 192 [2019-02-28 10:12:45,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:12:45,479 INFO L480 AbstractCegarLoop]: Abstraction has 197 states and 197 transitions. [2019-02-28 10:12:45,479 INFO L481 AbstractCegarLoop]: Interpolant automaton has 98 states. [2019-02-28 10:12:45,479 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 197 transitions. [2019-02-28 10:12:45,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2019-02-28 10:12:45,480 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:12:45,480 INFO L402 BasicCegarLoop]: trace histogram [49, 49, 48, 48, 1, 1] [2019-02-28 10:12:45,480 INFO L423 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:12:45,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:12:45,480 INFO L82 PathProgramCache]: Analyzing trace with hash 331927062, now seen corresponding path program 48 times [2019-02-28 10:12:45,481 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:12:45,481 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:45,481 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:12:45,481 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:45,481 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:12:45,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:12:46,885 INFO L134 CoverageAnalysis]: Checked inductivity of 4656 backedges. 0 proven. 4656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:46,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:46,885 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:12:46,885 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:12:46,885 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:12:46,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:46,886 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 [2019-02-28 10:12:46,894 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:12:46,894 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:12:46,956 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:12:46,956 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:12:46,959 INFO L256 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 154 conjunts are in the unsatisfiable core [2019-02-28 10:12:46,962 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:12:46,968 INFO L442 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 [2019-02-28 10:12:46,968 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:12:46,978 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:12:46,978 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:12:48,596 INFO L134 CoverageAnalysis]: Checked inductivity of 4656 backedges. 0 proven. 4656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:48,596 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:12:51,540 INFO L134 CoverageAnalysis]: Checked inductivity of 4656 backedges. 0 proven. 4656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:51,558 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:12:51,558 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 147 [2019-02-28 10:12:51,558 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:12:51,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 100 states [2019-02-28 10:12:51,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2019-02-28 10:12:51,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9850, Invalid=12202, Unknown=0, NotChecked=0, Total=22052 [2019-02-28 10:12:51,560 INFO L87 Difference]: Start difference. First operand 197 states and 197 transitions. Second operand 100 states. [2019-02-28 10:12:51,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:12:51,920 INFO L93 Difference]: Finished difference Result 203 states and 203 transitions. [2019-02-28 10:12:51,921 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2019-02-28 10:12:51,921 INFO L78 Accepts]: Start accepts. Automaton has 100 states. Word has length 196 [2019-02-28 10:12:51,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:12:51,922 INFO L225 Difference]: With dead ends: 203 [2019-02-28 10:12:51,922 INFO L226 Difference]: Without dead ends: 202 [2019-02-28 10:12:51,923 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 439 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9506 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=9850, Invalid=12202, Unknown=0, NotChecked=0, Total=22052 [2019-02-28 10:12:51,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2019-02-28 10:12:51,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 201. [2019-02-28 10:12:51,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2019-02-28 10:12:51,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 201 transitions. [2019-02-28 10:12:51,928 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 201 transitions. Word has length 196 [2019-02-28 10:12:51,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:12:51,929 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 201 transitions. [2019-02-28 10:12:51,929 INFO L481 AbstractCegarLoop]: Interpolant automaton has 100 states. [2019-02-28 10:12:51,929 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 201 transitions. [2019-02-28 10:12:51,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2019-02-28 10:12:51,930 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:12:51,930 INFO L402 BasicCegarLoop]: trace histogram [50, 50, 49, 49, 1, 1] [2019-02-28 10:12:51,930 INFO L423 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:12:51,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:12:51,930 INFO L82 PathProgramCache]: Analyzing trace with hash 1207690063, now seen corresponding path program 49 times [2019-02-28 10:12:51,930 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:12:51,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:51,931 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:12:51,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:51,931 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:12:51,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:12:53,394 INFO L134 CoverageAnalysis]: Checked inductivity of 4851 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:53,394 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:53,394 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:12:53,395 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:12:53,395 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:12:53,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:12:53,395 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-28 10:12:53,404 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:12:53,404 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:12:53,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:12:53,459 INFO L256 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 157 conjunts are in the unsatisfiable core [2019-02-28 10:12:53,461 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:12:53,467 INFO L442 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 [2019-02-28 10:12:53,467 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:12:53,479 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:12:53,479 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:12:54,973 INFO L134 CoverageAnalysis]: Checked inductivity of 4851 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:54,973 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:12:58,398 INFO L134 CoverageAnalysis]: Checked inductivity of 4851 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:12:58,418 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:12:58,418 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 150 [2019-02-28 10:12:58,418 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:12:58,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2019-02-28 10:12:58,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2019-02-28 10:12:58,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10251, Invalid=12701, Unknown=0, NotChecked=0, Total=22952 [2019-02-28 10:12:58,420 INFO L87 Difference]: Start difference. First operand 201 states and 201 transitions. Second operand 102 states. [2019-02-28 10:12:58,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:12:58,731 INFO L93 Difference]: Finished difference Result 207 states and 207 transitions. [2019-02-28 10:12:58,731 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2019-02-28 10:12:58,732 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 200 [2019-02-28 10:12:58,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:12:58,733 INFO L225 Difference]: With dead ends: 207 [2019-02-28 10:12:58,734 INFO L226 Difference]: Without dead ends: 206 [2019-02-28 10:12:58,735 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 298 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9900 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=10251, Invalid=12701, Unknown=0, NotChecked=0, Total=22952 [2019-02-28 10:12:58,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2019-02-28 10:12:58,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 205. [2019-02-28 10:12:58,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2019-02-28 10:12:58,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 205 transitions. [2019-02-28 10:12:58,740 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 205 transitions. Word has length 200 [2019-02-28 10:12:58,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:12:58,740 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 205 transitions. [2019-02-28 10:12:58,740 INFO L481 AbstractCegarLoop]: Interpolant automaton has 102 states. [2019-02-28 10:12:58,740 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 205 transitions. [2019-02-28 10:12:58,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2019-02-28 10:12:58,741 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:12:58,741 INFO L402 BasicCegarLoop]: trace histogram [51, 51, 50, 50, 1, 1] [2019-02-28 10:12:58,741 INFO L423 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:12:58,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:12:58,742 INFO L82 PathProgramCache]: Analyzing trace with hash 1438626824, now seen corresponding path program 50 times [2019-02-28 10:12:58,742 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:12:58,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:58,743 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:12:58,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:12:58,743 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:12:58,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:13:00,086 INFO L134 CoverageAnalysis]: Checked inductivity of 5050 backedges. 0 proven. 5050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:00,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:13:00,086 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:13:00,087 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:13:00,087 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:13:00,087 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:13:00,087 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 [2019-02-28 10:13:00,096 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:13:00,096 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:13:00,285 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2019-02-28 10:13:00,285 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:13:00,289 INFO L256 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 160 conjunts are in the unsatisfiable core [2019-02-28 10:13:00,291 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:13:00,293 INFO L442 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 [2019-02-28 10:13:00,293 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:13:00,311 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:13:00,312 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:13:01,864 INFO L134 CoverageAnalysis]: Checked inductivity of 5050 backedges. 0 proven. 5050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:01,865 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:13:05,155 INFO L134 CoverageAnalysis]: Checked inductivity of 5050 backedges. 0 proven. 5050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:05,173 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:13:05,174 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 151 [2019-02-28 10:13:05,174 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:13:05,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2019-02-28 10:13:05,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2019-02-28 10:13:05,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10353, Invalid=12903, Unknown=0, NotChecked=0, Total=23256 [2019-02-28 10:13:05,176 INFO L87 Difference]: Start difference. First operand 205 states and 205 transitions. Second operand 104 states. [2019-02-28 10:13:05,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:13:05,568 INFO L93 Difference]: Finished difference Result 211 states and 211 transitions. [2019-02-28 10:13:05,568 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2019-02-28 10:13:05,568 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 204 [2019-02-28 10:13:05,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:13:05,570 INFO L225 Difference]: With dead ends: 211 [2019-02-28 10:13:05,571 INFO L226 Difference]: Without dead ends: 210 [2019-02-28 10:13:05,572 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 304 SyntacticMatches, 2 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10397 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=10353, Invalid=12903, Unknown=0, NotChecked=0, Total=23256 [2019-02-28 10:13:05,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2019-02-28 10:13:05,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 209. [2019-02-28 10:13:05,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2019-02-28 10:13:05,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 209 transitions. [2019-02-28 10:13:05,577 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 209 transitions. Word has length 204 [2019-02-28 10:13:05,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:13:05,577 INFO L480 AbstractCegarLoop]: Abstraction has 209 states and 209 transitions. [2019-02-28 10:13:05,577 INFO L481 AbstractCegarLoop]: Interpolant automaton has 104 states. [2019-02-28 10:13:05,577 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 209 transitions. [2019-02-28 10:13:05,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2019-02-28 10:13:05,578 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:13:05,578 INFO L402 BasicCegarLoop]: trace histogram [52, 52, 51, 51, 1, 1] [2019-02-28 10:13:05,579 INFO L423 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:13:05,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:13:05,579 INFO L82 PathProgramCache]: Analyzing trace with hash 1196064833, now seen corresponding path program 51 times [2019-02-28 10:13:05,579 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:13:05,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:13:05,580 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:13:05,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:13:05,580 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:13:05,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:13:07,184 INFO L134 CoverageAnalysis]: Checked inductivity of 5253 backedges. 0 proven. 5253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:07,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:13:07,184 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:13:07,184 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:13:07,184 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:13:07,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:13:07,185 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 [2019-02-28 10:13:07,193 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:13:07,193 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:13:07,269 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:13:07,269 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:13:07,273 INFO L256 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 163 conjunts are in the unsatisfiable core [2019-02-28 10:13:07,276 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:13:07,293 INFO L442 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 [2019-02-28 10:13:07,294 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:13:07,385 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:13:07,386 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:13:09,998 INFO L134 CoverageAnalysis]: Checked inductivity of 5253 backedges. 0 proven. 5253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:09,999 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:13:13,402 INFO L134 CoverageAnalysis]: Checked inductivity of 5253 backedges. 0 proven. 5253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:13,421 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:13:13,421 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 152 [2019-02-28 10:13:13,422 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:13:13,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 106 states [2019-02-28 10:13:13,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2019-02-28 10:13:13,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10455, Invalid=13107, Unknown=0, NotChecked=0, Total=23562 [2019-02-28 10:13:13,424 INFO L87 Difference]: Start difference. First operand 209 states and 209 transitions. Second operand 106 states. [2019-02-28 10:13:13,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:13:13,847 INFO L93 Difference]: Finished difference Result 215 states and 215 transitions. [2019-02-28 10:13:13,848 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2019-02-28 10:13:13,848 INFO L78 Accepts]: Start accepts. Automaton has 106 states. Word has length 208 [2019-02-28 10:13:13,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:13:13,850 INFO L225 Difference]: With dead ends: 215 [2019-02-28 10:13:13,850 INFO L226 Difference]: Without dead ends: 214 [2019-02-28 10:13:13,851 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 310 SyntacticMatches, 4 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10894 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=10455, Invalid=13107, Unknown=0, NotChecked=0, Total=23562 [2019-02-28 10:13:13,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2019-02-28 10:13:13,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 213. [2019-02-28 10:13:13,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2019-02-28 10:13:13,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 213 transitions. [2019-02-28 10:13:13,857 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 213 transitions. Word has length 208 [2019-02-28 10:13:13,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:13:13,857 INFO L480 AbstractCegarLoop]: Abstraction has 213 states and 213 transitions. [2019-02-28 10:13:13,857 INFO L481 AbstractCegarLoop]: Interpolant automaton has 106 states. [2019-02-28 10:13:13,857 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 213 transitions. [2019-02-28 10:13:13,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2019-02-28 10:13:13,858 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:13:13,858 INFO L402 BasicCegarLoop]: trace histogram [53, 53, 52, 52, 1, 1] [2019-02-28 10:13:13,859 INFO L423 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:13:13,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:13:13,859 INFO L82 PathProgramCache]: Analyzing trace with hash -1582135302, now seen corresponding path program 52 times [2019-02-28 10:13:13,859 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:13:13,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:13:13,860 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:13:13,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:13:13,860 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:13:13,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:13:15,253 INFO L134 CoverageAnalysis]: Checked inductivity of 5460 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:15,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:13:15,254 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:13:15,254 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:13:15,254 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:13:15,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:13:15,254 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 [2019-02-28 10:13:15,263 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:13:15,264 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:13:15,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:13:15,324 INFO L256 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 166 conjunts are in the unsatisfiable core [2019-02-28 10:13:15,327 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:13:15,348 INFO L442 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 [2019-02-28 10:13:15,349 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:13:15,372 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:13:15,372 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:13:17,055 INFO L134 CoverageAnalysis]: Checked inductivity of 5460 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:17,055 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:13:20,544 INFO L134 CoverageAnalysis]: Checked inductivity of 5460 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:20,562 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:13:20,562 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 153 [2019-02-28 10:13:20,562 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:13:20,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 108 states [2019-02-28 10:13:20,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2019-02-28 10:13:20,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10557, Invalid=13313, Unknown=0, NotChecked=0, Total=23870 [2019-02-28 10:13:20,565 INFO L87 Difference]: Start difference. First operand 213 states and 213 transitions. Second operand 108 states. [2019-02-28 10:13:20,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:13:20,932 INFO L93 Difference]: Finished difference Result 219 states and 219 transitions. [2019-02-28 10:13:20,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2019-02-28 10:13:20,933 INFO L78 Accepts]: Start accepts. Automaton has 108 states. Word has length 212 [2019-02-28 10:13:20,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:13:20,934 INFO L225 Difference]: With dead ends: 219 [2019-02-28 10:13:20,934 INFO L226 Difference]: Without dead ends: 218 [2019-02-28 10:13:20,936 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 316 SyntacticMatches, 6 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11391 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=10557, Invalid=13313, Unknown=0, NotChecked=0, Total=23870 [2019-02-28 10:13:20,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2019-02-28 10:13:20,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 217. [2019-02-28 10:13:20,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2019-02-28 10:13:20,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 217 transitions. [2019-02-28 10:13:20,939 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 217 transitions. Word has length 212 [2019-02-28 10:13:20,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:13:20,940 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 217 transitions. [2019-02-28 10:13:20,940 INFO L481 AbstractCegarLoop]: Interpolant automaton has 108 states. [2019-02-28 10:13:20,940 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 217 transitions. [2019-02-28 10:13:20,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2019-02-28 10:13:20,941 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:13:20,941 INFO L402 BasicCegarLoop]: trace histogram [54, 54, 53, 53, 1, 1] [2019-02-28 10:13:20,941 INFO L423 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:13:20,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:13:20,941 INFO L82 PathProgramCache]: Analyzing trace with hash -185726157, now seen corresponding path program 53 times [2019-02-28 10:13:20,941 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:13:20,942 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:13:20,942 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:13:20,942 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:13:20,942 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:13:20,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:13:22,385 INFO L134 CoverageAnalysis]: Checked inductivity of 5671 backedges. 0 proven. 5671 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:22,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:13:22,385 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:13:22,385 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:13:22,385 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:13:22,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:13:22,385 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 [2019-02-28 10:13:22,394 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:13:22,395 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:13:22,606 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2019-02-28 10:13:22,606 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:13:22,610 INFO L256 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 169 conjunts are in the unsatisfiable core [2019-02-28 10:13:22,612 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:13:22,619 INFO L442 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 [2019-02-28 10:13:22,620 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:13:22,628 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:13:22,628 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:13:24,564 INFO L134 CoverageAnalysis]: Checked inductivity of 5671 backedges. 0 proven. 5671 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:24,565 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:13:27,758 INFO L134 CoverageAnalysis]: Checked inductivity of 5671 backedges. 0 proven. 5671 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:27,777 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:13:27,777 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 154 [2019-02-28 10:13:27,777 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:13:27,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2019-02-28 10:13:27,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2019-02-28 10:13:27,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10659, Invalid=13521, Unknown=0, NotChecked=0, Total=24180 [2019-02-28 10:13:27,779 INFO L87 Difference]: Start difference. First operand 217 states and 217 transitions. Second operand 110 states. [2019-02-28 10:13:28,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:13:28,220 INFO L93 Difference]: Finished difference Result 223 states and 223 transitions. [2019-02-28 10:13:28,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2019-02-28 10:13:28,221 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 216 [2019-02-28 10:13:28,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:13:28,222 INFO L225 Difference]: With dead ends: 223 [2019-02-28 10:13:28,222 INFO L226 Difference]: Without dead ends: 222 [2019-02-28 10:13:28,222 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 322 SyntacticMatches, 8 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11888 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=10659, Invalid=13521, Unknown=0, NotChecked=0, Total=24180 [2019-02-28 10:13:28,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2019-02-28 10:13:28,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 221. [2019-02-28 10:13:28,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 221 states. [2019-02-28 10:13:28,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 221 transitions. [2019-02-28 10:13:28,228 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 221 transitions. Word has length 216 [2019-02-28 10:13:28,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:13:28,228 INFO L480 AbstractCegarLoop]: Abstraction has 221 states and 221 transitions. [2019-02-28 10:13:28,228 INFO L481 AbstractCegarLoop]: Interpolant automaton has 110 states. [2019-02-28 10:13:28,228 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 221 transitions. [2019-02-28 10:13:28,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2019-02-28 10:13:28,229 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:13:28,229 INFO L402 BasicCegarLoop]: trace histogram [55, 55, 54, 54, 1, 1] [2019-02-28 10:13:28,229 INFO L423 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:13:28,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:13:28,229 INFO L82 PathProgramCache]: Analyzing trace with hash 1809009132, now seen corresponding path program 54 times [2019-02-28 10:13:28,229 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:13:28,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:13:28,230 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:13:28,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:13:28,230 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:13:28,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:13:29,783 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 0 proven. 5886 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:29,783 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:13:29,783 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:13:29,783 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:13:29,784 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:13:29,784 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:13:29,784 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 [2019-02-28 10:13:29,793 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:13:29,793 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:13:29,859 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:13:29,859 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:13:29,862 INFO L256 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 172 conjunts are in the unsatisfiable core [2019-02-28 10:13:29,865 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:13:29,868 INFO L442 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 [2019-02-28 10:13:29,868 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:13:29,880 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:13:29,880 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:13:31,711 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 0 proven. 5886 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:31,712 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:13:35,166 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 0 proven. 5886 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:35,184 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:13:35,184 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 155 [2019-02-28 10:13:35,184 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:13:35,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 112 states [2019-02-28 10:13:35,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2019-02-28 10:13:35,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10761, Invalid=13731, Unknown=0, NotChecked=0, Total=24492 [2019-02-28 10:13:35,186 INFO L87 Difference]: Start difference. First operand 221 states and 221 transitions. Second operand 112 states. [2019-02-28 10:13:35,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:13:35,631 INFO L93 Difference]: Finished difference Result 227 states and 227 transitions. [2019-02-28 10:13:35,631 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2019-02-28 10:13:35,631 INFO L78 Accepts]: Start accepts. Automaton has 112 states. Word has length 220 [2019-02-28 10:13:35,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:13:35,633 INFO L225 Difference]: With dead ends: 227 [2019-02-28 10:13:35,633 INFO L226 Difference]: Without dead ends: 226 [2019-02-28 10:13:35,634 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 328 SyntacticMatches, 10 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12385 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=10761, Invalid=13731, Unknown=0, NotChecked=0, Total=24492 [2019-02-28 10:13:35,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2019-02-28 10:13:35,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 225. [2019-02-28 10:13:35,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2019-02-28 10:13:35,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 225 transitions. [2019-02-28 10:13:35,639 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 225 transitions. Word has length 220 [2019-02-28 10:13:35,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:13:35,640 INFO L480 AbstractCegarLoop]: Abstraction has 225 states and 225 transitions. [2019-02-28 10:13:35,640 INFO L481 AbstractCegarLoop]: Interpolant automaton has 112 states. [2019-02-28 10:13:35,640 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 225 transitions. [2019-02-28 10:13:35,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2019-02-28 10:13:35,641 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:13:35,641 INFO L402 BasicCegarLoop]: trace histogram [56, 56, 55, 55, 1, 1] [2019-02-28 10:13:35,641 INFO L423 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:13:35,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:13:35,642 INFO L82 PathProgramCache]: Analyzing trace with hash 1545110565, now seen corresponding path program 55 times [2019-02-28 10:13:35,642 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:13:35,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:13:35,642 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:13:35,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:13:35,643 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:13:35,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:13:37,130 INFO L134 CoverageAnalysis]: Checked inductivity of 6105 backedges. 0 proven. 6105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:37,130 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:13:37,130 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:13:37,130 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:13:37,130 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:13:37,130 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:13:37,130 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 [2019-02-28 10:13:37,161 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:13:37,161 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:13:37,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:13:37,224 INFO L256 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 175 conjunts are in the unsatisfiable core [2019-02-28 10:13:37,227 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:13:37,230 INFO L442 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 [2019-02-28 10:13:37,230 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:13:37,241 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:13:37,241 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:13:39,310 INFO L134 CoverageAnalysis]: Checked inductivity of 6105 backedges. 0 proven. 6105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:39,310 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:13:42,718 INFO L134 CoverageAnalysis]: Checked inductivity of 6105 backedges. 0 proven. 6105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:42,736 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:13:42,736 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 156 [2019-02-28 10:13:42,736 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:13:42,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 114 states [2019-02-28 10:13:42,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2019-02-28 10:13:42,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10863, Invalid=13943, Unknown=0, NotChecked=0, Total=24806 [2019-02-28 10:13:42,738 INFO L87 Difference]: Start difference. First operand 225 states and 225 transitions. Second operand 114 states. [2019-02-28 10:13:43,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:13:43,198 INFO L93 Difference]: Finished difference Result 231 states and 231 transitions. [2019-02-28 10:13:43,198 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2019-02-28 10:13:43,198 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 224 [2019-02-28 10:13:43,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:13:43,200 INFO L225 Difference]: With dead ends: 231 [2019-02-28 10:13:43,200 INFO L226 Difference]: Without dead ends: 230 [2019-02-28 10:13:43,201 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 334 SyntacticMatches, 12 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12882 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=10863, Invalid=13943, Unknown=0, NotChecked=0, Total=24806 [2019-02-28 10:13:43,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2019-02-28 10:13:43,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 229. [2019-02-28 10:13:43,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2019-02-28 10:13:43,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 229 transitions. [2019-02-28 10:13:43,207 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 229 transitions. Word has length 224 [2019-02-28 10:13:43,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:13:43,207 INFO L480 AbstractCegarLoop]: Abstraction has 229 states and 229 transitions. [2019-02-28 10:13:43,207 INFO L481 AbstractCegarLoop]: Interpolant automaton has 114 states. [2019-02-28 10:13:43,207 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 229 transitions. [2019-02-28 10:13:43,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2019-02-28 10:13:43,208 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:13:43,209 INFO L402 BasicCegarLoop]: trace histogram [57, 57, 56, 56, 1, 1] [2019-02-28 10:13:43,209 INFO L423 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:13:43,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:13:43,209 INFO L82 PathProgramCache]: Analyzing trace with hash -699139618, now seen corresponding path program 56 times [2019-02-28 10:13:43,209 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:13:43,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:13:43,210 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:13:43,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:13:43,210 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:13:43,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:13:44,985 INFO L134 CoverageAnalysis]: Checked inductivity of 6328 backedges. 0 proven. 6328 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:44,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:13:44,985 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:13:44,985 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:13:44,986 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:13:44,986 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:13:44,986 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 [2019-02-28 10:13:44,995 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:13:44,995 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:13:45,235 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2019-02-28 10:13:45,235 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:13:45,240 INFO L256 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 178 conjunts are in the unsatisfiable core [2019-02-28 10:13:45,243 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:13:45,259 INFO L442 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 [2019-02-28 10:13:45,260 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:13:45,280 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:13:45,281 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:13:47,175 INFO L134 CoverageAnalysis]: Checked inductivity of 6328 backedges. 0 proven. 6328 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:47,175 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:13:50,820 INFO L134 CoverageAnalysis]: Checked inductivity of 6328 backedges. 0 proven. 6328 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:50,839 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:13:50,839 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 157 [2019-02-28 10:13:50,840 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:13:50,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2019-02-28 10:13:50,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2019-02-28 10:13:50,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10965, Invalid=14157, Unknown=0, NotChecked=0, Total=25122 [2019-02-28 10:13:50,842 INFO L87 Difference]: Start difference. First operand 229 states and 229 transitions. Second operand 116 states. [2019-02-28 10:13:51,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:13:51,312 INFO L93 Difference]: Finished difference Result 235 states and 235 transitions. [2019-02-28 10:13:51,313 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2019-02-28 10:13:51,313 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 228 [2019-02-28 10:13:51,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:13:51,314 INFO L225 Difference]: With dead ends: 235 [2019-02-28 10:13:51,315 INFO L226 Difference]: Without dead ends: 234 [2019-02-28 10:13:51,315 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 511 GetRequests, 340 SyntacticMatches, 14 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13379 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=10965, Invalid=14157, Unknown=0, NotChecked=0, Total=25122 [2019-02-28 10:13:51,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2019-02-28 10:13:51,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 233. [2019-02-28 10:13:51,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2019-02-28 10:13:51,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 233 transitions. [2019-02-28 10:13:51,321 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 233 transitions. Word has length 228 [2019-02-28 10:13:51,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:13:51,321 INFO L480 AbstractCegarLoop]: Abstraction has 233 states and 233 transitions. [2019-02-28 10:13:51,321 INFO L481 AbstractCegarLoop]: Interpolant automaton has 116 states. [2019-02-28 10:13:51,321 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 233 transitions. [2019-02-28 10:13:51,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 233 [2019-02-28 10:13:51,322 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:13:51,323 INFO L402 BasicCegarLoop]: trace histogram [58, 58, 57, 57, 1, 1] [2019-02-28 10:13:51,323 INFO L423 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:13:51,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:13:51,323 INFO L82 PathProgramCache]: Analyzing trace with hash 905702167, now seen corresponding path program 57 times [2019-02-28 10:13:51,323 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:13:51,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:13:51,324 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:13:51,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:13:51,324 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:13:51,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:13:52,947 INFO L134 CoverageAnalysis]: Checked inductivity of 6555 backedges. 0 proven. 6555 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:52,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:13:52,947 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:13:52,948 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:13:52,948 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:13:52,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:13:52,948 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 [2019-02-28 10:13:52,955 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:13:52,956 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:13:53,021 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:13:53,022 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:13:53,025 INFO L256 TraceCheckSpWp]: Trace formula consists of 422 conjuncts, 181 conjunts are in the unsatisfiable core [2019-02-28 10:13:53,029 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:13:53,034 INFO L442 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 [2019-02-28 10:13:53,034 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:13:53,043 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:13:53,043 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:13:55,390 INFO L134 CoverageAnalysis]: Checked inductivity of 6555 backedges. 0 proven. 6555 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:55,390 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:13:58,816 INFO L134 CoverageAnalysis]: Checked inductivity of 6555 backedges. 0 proven. 6555 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:13:58,836 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:13:58,836 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 158 [2019-02-28 10:13:58,836 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:13:58,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 118 states [2019-02-28 10:13:58,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2019-02-28 10:13:58,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11067, Invalid=14373, Unknown=0, NotChecked=0, Total=25440 [2019-02-28 10:13:58,839 INFO L87 Difference]: Start difference. First operand 233 states and 233 transitions. Second operand 118 states. [2019-02-28 10:13:59,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:13:59,359 INFO L93 Difference]: Finished difference Result 239 states and 239 transitions. [2019-02-28 10:13:59,360 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2019-02-28 10:13:59,360 INFO L78 Accepts]: Start accepts. Automaton has 118 states. Word has length 232 [2019-02-28 10:13:59,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:13:59,361 INFO L225 Difference]: With dead ends: 239 [2019-02-28 10:13:59,361 INFO L226 Difference]: Without dead ends: 238 [2019-02-28 10:13:59,362 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 520 GetRequests, 346 SyntacticMatches, 16 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13876 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=11067, Invalid=14373, Unknown=0, NotChecked=0, Total=25440 [2019-02-28 10:13:59,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2019-02-28 10:13:59,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 237. [2019-02-28 10:13:59,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 237 states. [2019-02-28 10:13:59,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 237 transitions. [2019-02-28 10:13:59,366 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 237 transitions. Word has length 232 [2019-02-28 10:13:59,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:13:59,366 INFO L480 AbstractCegarLoop]: Abstraction has 237 states and 237 transitions. [2019-02-28 10:13:59,366 INFO L481 AbstractCegarLoop]: Interpolant automaton has 118 states. [2019-02-28 10:13:59,366 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 237 transitions. [2019-02-28 10:13:59,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2019-02-28 10:13:59,367 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:13:59,367 INFO L402 BasicCegarLoop]: trace histogram [59, 59, 58, 58, 1, 1] [2019-02-28 10:13:59,368 INFO L423 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:13:59,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:13:59,368 INFO L82 PathProgramCache]: Analyzing trace with hash -1318676528, now seen corresponding path program 58 times [2019-02-28 10:13:59,368 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:13:59,368 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:13:59,368 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:13:59,369 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:13:59,369 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:13:59,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:14:01,050 INFO L134 CoverageAnalysis]: Checked inductivity of 6786 backedges. 0 proven. 6786 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:01,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:14:01,050 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:14:01,050 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:14:01,050 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:14:01,051 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:14:01,051 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 [2019-02-28 10:14:01,061 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:14:01,062 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:14:01,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:14:01,127 INFO L256 TraceCheckSpWp]: Trace formula consists of 429 conjuncts, 184 conjunts are in the unsatisfiable core [2019-02-28 10:14:01,130 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:14:01,135 INFO L442 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 [2019-02-28 10:14:01,135 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:14:01,149 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:14:01,149 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:14:03,172 INFO L134 CoverageAnalysis]: Checked inductivity of 6786 backedges. 0 proven. 6786 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:03,172 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:14:06,832 INFO L134 CoverageAnalysis]: Checked inductivity of 6786 backedges. 0 proven. 6786 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:06,851 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:14:06,851 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 159 [2019-02-28 10:14:06,851 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:14:06,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 120 states [2019-02-28 10:14:06,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2019-02-28 10:14:06,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11169, Invalid=14591, Unknown=0, NotChecked=0, Total=25760 [2019-02-28 10:14:06,853 INFO L87 Difference]: Start difference. First operand 237 states and 237 transitions. Second operand 120 states. [2019-02-28 10:14:07,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:14:07,319 INFO L93 Difference]: Finished difference Result 243 states and 243 transitions. [2019-02-28 10:14:07,319 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2019-02-28 10:14:07,319 INFO L78 Accepts]: Start accepts. Automaton has 120 states. Word has length 236 [2019-02-28 10:14:07,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:14:07,321 INFO L225 Difference]: With dead ends: 243 [2019-02-28 10:14:07,321 INFO L226 Difference]: Without dead ends: 242 [2019-02-28 10:14:07,322 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 352 SyntacticMatches, 18 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14373 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=11169, Invalid=14591, Unknown=0, NotChecked=0, Total=25760 [2019-02-28 10:14:07,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2019-02-28 10:14:07,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 241. [2019-02-28 10:14:07,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2019-02-28 10:14:07,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 241 transitions. [2019-02-28 10:14:07,326 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 241 transitions. Word has length 236 [2019-02-28 10:14:07,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:14:07,326 INFO L480 AbstractCegarLoop]: Abstraction has 241 states and 241 transitions. [2019-02-28 10:14:07,326 INFO L481 AbstractCegarLoop]: Interpolant automaton has 120 states. [2019-02-28 10:14:07,326 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 241 transitions. [2019-02-28 10:14:07,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2019-02-28 10:14:07,327 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:14:07,327 INFO L402 BasicCegarLoop]: trace histogram [60, 60, 59, 59, 1, 1] [2019-02-28 10:14:07,327 INFO L423 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:14:07,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:14:07,327 INFO L82 PathProgramCache]: Analyzing trace with hash -372621303, now seen corresponding path program 59 times [2019-02-28 10:14:07,328 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:14:07,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:14:07,328 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:14:07,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:14:07,329 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:14:07,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:14:09,106 INFO L134 CoverageAnalysis]: Checked inductivity of 7021 backedges. 0 proven. 7021 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:09,106 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:14:09,106 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:14:09,106 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:14:09,107 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:14:09,107 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:14:09,107 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 [2019-02-28 10:14:09,117 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:14:09,118 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:14:09,375 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2019-02-28 10:14:09,375 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:14:09,379 INFO L256 TraceCheckSpWp]: Trace formula consists of 436 conjuncts, 187 conjunts are in the unsatisfiable core [2019-02-28 10:14:09,381 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:14:09,384 INFO L442 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 [2019-02-28 10:14:09,384 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:14:09,392 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:14:09,392 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:14:11,507 INFO L134 CoverageAnalysis]: Checked inductivity of 7021 backedges. 0 proven. 7021 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:11,507 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:14:15,306 INFO L134 CoverageAnalysis]: Checked inductivity of 7021 backedges. 0 proven. 7021 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:15,326 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:14:15,326 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 160 [2019-02-28 10:14:15,326 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:14:15,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2019-02-28 10:14:15,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2019-02-28 10:14:15,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11271, Invalid=14811, Unknown=0, NotChecked=0, Total=26082 [2019-02-28 10:14:15,328 INFO L87 Difference]: Start difference. First operand 241 states and 241 transitions. Second operand 122 states. [2019-02-28 10:14:15,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:14:15,796 INFO L93 Difference]: Finished difference Result 247 states and 247 transitions. [2019-02-28 10:14:15,796 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2019-02-28 10:14:15,796 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 240 [2019-02-28 10:14:15,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:14:15,798 INFO L225 Difference]: With dead ends: 247 [2019-02-28 10:14:15,798 INFO L226 Difference]: Without dead ends: 246 [2019-02-28 10:14:15,799 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 358 SyntacticMatches, 20 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14870 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=11271, Invalid=14811, Unknown=0, NotChecked=0, Total=26082 [2019-02-28 10:14:15,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2019-02-28 10:14:15,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 245. [2019-02-28 10:14:15,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245 states. [2019-02-28 10:14:15,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 245 transitions. [2019-02-28 10:14:15,805 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 245 transitions. Word has length 240 [2019-02-28 10:14:15,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:14:15,805 INFO L480 AbstractCegarLoop]: Abstraction has 245 states and 245 transitions. [2019-02-28 10:14:15,805 INFO L481 AbstractCegarLoop]: Interpolant automaton has 122 states. [2019-02-28 10:14:15,805 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 245 transitions. [2019-02-28 10:14:15,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2019-02-28 10:14:15,806 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:14:15,807 INFO L402 BasicCegarLoop]: trace histogram [61, 61, 60, 60, 1, 1] [2019-02-28 10:14:15,807 INFO L423 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:14:15,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:14:15,807 INFO L82 PathProgramCache]: Analyzing trace with hash 2067604418, now seen corresponding path program 60 times [2019-02-28 10:14:15,807 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:14:15,808 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:14:15,808 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:14:15,808 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:14:15,808 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:14:15,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:14:17,544 INFO L134 CoverageAnalysis]: Checked inductivity of 7260 backedges. 0 proven. 7260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:17,544 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:14:17,544 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:14:17,544 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:14:17,544 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:14:17,544 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:14:17,544 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 [2019-02-28 10:14:17,555 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:14:17,555 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:14:17,628 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:14:17,629 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:14:17,633 INFO L256 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 190 conjunts are in the unsatisfiable core [2019-02-28 10:14:17,635 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:14:17,652 INFO L442 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 [2019-02-28 10:14:17,653 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:14:17,661 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:14:17,661 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:14:19,935 INFO L134 CoverageAnalysis]: Checked inductivity of 7260 backedges. 0 proven. 7260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:19,935 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:14:23,463 INFO L134 CoverageAnalysis]: Checked inductivity of 7260 backedges. 0 proven. 7260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:23,481 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:14:23,482 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 161 [2019-02-28 10:14:23,482 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:14:23,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 124 states [2019-02-28 10:14:23,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2019-02-28 10:14:23,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11373, Invalid=15033, Unknown=0, NotChecked=0, Total=26406 [2019-02-28 10:14:23,484 INFO L87 Difference]: Start difference. First operand 245 states and 245 transitions. Second operand 124 states. [2019-02-28 10:14:23,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:14:23,948 INFO L93 Difference]: Finished difference Result 251 states and 251 transitions. [2019-02-28 10:14:23,948 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2019-02-28 10:14:23,948 INFO L78 Accepts]: Start accepts. Automaton has 124 states. Word has length 244 [2019-02-28 10:14:23,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:14:23,949 INFO L225 Difference]: With dead ends: 251 [2019-02-28 10:14:23,949 INFO L226 Difference]: Without dead ends: 250 [2019-02-28 10:14:23,950 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 547 GetRequests, 364 SyntacticMatches, 22 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15367 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=11373, Invalid=15033, Unknown=0, NotChecked=0, Total=26406 [2019-02-28 10:14:23,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2019-02-28 10:14:23,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 249. [2019-02-28 10:14:23,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 249 states. [2019-02-28 10:14:23,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 249 transitions. [2019-02-28 10:14:23,955 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 249 transitions. Word has length 244 [2019-02-28 10:14:23,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:14:23,956 INFO L480 AbstractCegarLoop]: Abstraction has 249 states and 249 transitions. [2019-02-28 10:14:23,956 INFO L481 AbstractCegarLoop]: Interpolant automaton has 124 states. [2019-02-28 10:14:23,956 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 249 transitions. [2019-02-28 10:14:23,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2019-02-28 10:14:23,957 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:14:23,957 INFO L402 BasicCegarLoop]: trace histogram [62, 62, 61, 61, 1, 1] [2019-02-28 10:14:23,957 INFO L423 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:14:23,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:14:23,958 INFO L82 PathProgramCache]: Analyzing trace with hash -1934261509, now seen corresponding path program 61 times [2019-02-28 10:14:23,958 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:14:23,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:14:23,958 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:14:23,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:14:23,959 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:14:23,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:14:26,098 INFO L134 CoverageAnalysis]: Checked inductivity of 7503 backedges. 0 proven. 7503 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:26,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:14:26,099 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:14:26,099 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:14:26,099 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:14:26,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:14:26,099 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 [2019-02-28 10:14:26,107 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:14:26,108 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:14:26,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:14:26,175 INFO L256 TraceCheckSpWp]: Trace formula consists of 450 conjuncts, 193 conjunts are in the unsatisfiable core [2019-02-28 10:14:26,178 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:14:26,185 INFO L442 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 [2019-02-28 10:14:26,185 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:14:26,198 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:14:26,198 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:14:28,478 INFO L134 CoverageAnalysis]: Checked inductivity of 7503 backedges. 0 proven. 7503 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:28,478 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:14:32,358 INFO L134 CoverageAnalysis]: Checked inductivity of 7503 backedges. 0 proven. 7503 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:32,376 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:14:32,376 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 162 [2019-02-28 10:14:32,376 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:14:32,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 126 states [2019-02-28 10:14:32,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2019-02-28 10:14:32,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11475, Invalid=15257, Unknown=0, NotChecked=0, Total=26732 [2019-02-28 10:14:32,378 INFO L87 Difference]: Start difference. First operand 249 states and 249 transitions. Second operand 126 states. [2019-02-28 10:14:32,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:14:32,825 INFO L93 Difference]: Finished difference Result 255 states and 255 transitions. [2019-02-28 10:14:32,825 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2019-02-28 10:14:32,825 INFO L78 Accepts]: Start accepts. Automaton has 126 states. Word has length 248 [2019-02-28 10:14:32,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:14:32,827 INFO L225 Difference]: With dead ends: 255 [2019-02-28 10:14:32,827 INFO L226 Difference]: Without dead ends: 254 [2019-02-28 10:14:32,828 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 370 SyntacticMatches, 24 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15864 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=11475, Invalid=15257, Unknown=0, NotChecked=0, Total=26732 [2019-02-28 10:14:32,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2019-02-28 10:14:32,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 253. [2019-02-28 10:14:32,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 253 states. [2019-02-28 10:14:32,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 253 transitions. [2019-02-28 10:14:32,833 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 253 transitions. Word has length 248 [2019-02-28 10:14:32,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:14:32,833 INFO L480 AbstractCegarLoop]: Abstraction has 253 states and 253 transitions. [2019-02-28 10:14:32,833 INFO L481 AbstractCegarLoop]: Interpolant automaton has 126 states. [2019-02-28 10:14:32,833 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 253 transitions. [2019-02-28 10:14:32,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2019-02-28 10:14:32,834 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:14:32,834 INFO L402 BasicCegarLoop]: trace histogram [63, 63, 62, 62, 1, 1] [2019-02-28 10:14:32,834 INFO L423 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:14:32,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:14:32,835 INFO L82 PathProgramCache]: Analyzing trace with hash 1611242932, now seen corresponding path program 62 times [2019-02-28 10:14:32,835 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:14:32,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:14:32,835 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:14:32,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:14:32,835 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:14:32,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:14:34,702 INFO L134 CoverageAnalysis]: Checked inductivity of 7750 backedges. 0 proven. 7750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:34,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:14:34,702 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:14:34,703 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:14:34,703 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:14:34,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:14:34,703 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 [2019-02-28 10:14:34,711 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:14:34,711 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:14:34,998 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 63 check-sat command(s) [2019-02-28 10:14:34,998 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:14:35,002 INFO L256 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 196 conjunts are in the unsatisfiable core [2019-02-28 10:14:35,005 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:14:35,008 INFO L442 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 [2019-02-28 10:14:35,008 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:14:35,016 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:14:35,016 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:14:37,349 INFO L134 CoverageAnalysis]: Checked inductivity of 7750 backedges. 0 proven. 7750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:37,349 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:14:41,021 INFO L134 CoverageAnalysis]: Checked inductivity of 7750 backedges. 0 proven. 7750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:41,041 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:14:41,041 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 163 [2019-02-28 10:14:41,041 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:14:41,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2019-02-28 10:14:41,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2019-02-28 10:14:41,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11577, Invalid=15483, Unknown=0, NotChecked=0, Total=27060 [2019-02-28 10:14:41,043 INFO L87 Difference]: Start difference. First operand 253 states and 253 transitions. Second operand 128 states. [2019-02-28 10:14:41,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:14:41,481 INFO L93 Difference]: Finished difference Result 259 states and 259 transitions. [2019-02-28 10:14:41,481 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2019-02-28 10:14:41,481 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 252 [2019-02-28 10:14:41,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:14:41,482 INFO L225 Difference]: With dead ends: 259 [2019-02-28 10:14:41,483 INFO L226 Difference]: Without dead ends: 258 [2019-02-28 10:14:41,484 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 565 GetRequests, 376 SyntacticMatches, 26 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16361 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=11577, Invalid=15483, Unknown=0, NotChecked=0, Total=27060 [2019-02-28 10:14:41,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2019-02-28 10:14:41,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 257. [2019-02-28 10:14:41,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 257 states. [2019-02-28 10:14:41,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 257 transitions. [2019-02-28 10:14:41,488 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 257 transitions. Word has length 252 [2019-02-28 10:14:41,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:14:41,488 INFO L480 AbstractCegarLoop]: Abstraction has 257 states and 257 transitions. [2019-02-28 10:14:41,488 INFO L481 AbstractCegarLoop]: Interpolant automaton has 128 states. [2019-02-28 10:14:41,488 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 257 transitions. [2019-02-28 10:14:41,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2019-02-28 10:14:41,489 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:14:41,489 INFO L402 BasicCegarLoop]: trace histogram [64, 64, 63, 63, 1, 1] [2019-02-28 10:14:41,490 INFO L423 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:14:41,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:14:41,490 INFO L82 PathProgramCache]: Analyzing trace with hash -504384531, now seen corresponding path program 63 times [2019-02-28 10:14:41,490 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:14:41,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:14:41,491 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:14:41,491 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:14:41,491 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:14:41,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:14:43,461 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:43,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:14:43,461 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:14:43,461 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:14:43,462 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:14:43,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:14:43,462 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 [2019-02-28 10:14:43,472 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:14:43,472 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:14:43,548 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:14:43,548 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:14:43,553 INFO L256 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 199 conjunts are in the unsatisfiable core [2019-02-28 10:14:43,555 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:14:43,557 INFO L442 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 [2019-02-28 10:14:43,557 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:14:43,565 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:14:43,565 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:14:46,073 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:46,073 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:14:49,704 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:49,723 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:14:49,723 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 164 [2019-02-28 10:14:49,723 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:14:49,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 130 states [2019-02-28 10:14:49,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2019-02-28 10:14:49,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11679, Invalid=15711, Unknown=0, NotChecked=0, Total=27390 [2019-02-28 10:14:49,726 INFO L87 Difference]: Start difference. First operand 257 states and 257 transitions. Second operand 130 states. [2019-02-28 10:14:50,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:14:50,244 INFO L93 Difference]: Finished difference Result 263 states and 263 transitions. [2019-02-28 10:14:50,244 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2019-02-28 10:14:50,244 INFO L78 Accepts]: Start accepts. Automaton has 130 states. Word has length 256 [2019-02-28 10:14:50,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:14:50,246 INFO L225 Difference]: With dead ends: 263 [2019-02-28 10:14:50,246 INFO L226 Difference]: Without dead ends: 262 [2019-02-28 10:14:50,247 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 574 GetRequests, 382 SyntacticMatches, 28 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16858 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=11679, Invalid=15711, Unknown=0, NotChecked=0, Total=27390 [2019-02-28 10:14:50,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2019-02-28 10:14:50,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 261. [2019-02-28 10:14:50,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 261 states. [2019-02-28 10:14:50,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 261 transitions. [2019-02-28 10:14:50,253 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 261 transitions. Word has length 256 [2019-02-28 10:14:50,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:14:50,253 INFO L480 AbstractCegarLoop]: Abstraction has 261 states and 261 transitions. [2019-02-28 10:14:50,253 INFO L481 AbstractCegarLoop]: Interpolant automaton has 130 states. [2019-02-28 10:14:50,253 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 261 transitions. [2019-02-28 10:14:50,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2019-02-28 10:14:50,254 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:14:50,254 INFO L402 BasicCegarLoop]: trace histogram [65, 65, 64, 64, 1, 1] [2019-02-28 10:14:50,255 INFO L423 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:14:50,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:14:50,255 INFO L82 PathProgramCache]: Analyzing trace with hash 972948902, now seen corresponding path program 64 times [2019-02-28 10:14:50,255 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:14:50,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:14:50,256 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:14:50,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:14:50,256 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:14:50,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:14:52,303 INFO L134 CoverageAnalysis]: Checked inductivity of 8256 backedges. 0 proven. 8256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:52,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:14:52,304 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:14:52,304 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:14:52,304 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:14:52,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:14:52,304 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 [2019-02-28 10:14:52,314 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:14:52,314 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:14:52,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:14:52,389 INFO L256 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 202 conjunts are in the unsatisfiable core [2019-02-28 10:14:52,392 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:14:52,419 INFO L442 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 [2019-02-28 10:14:52,419 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:14:52,494 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:14:52,494 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:14:54,926 INFO L134 CoverageAnalysis]: Checked inductivity of 8256 backedges. 0 proven. 8256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:54,926 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:14:58,798 INFO L134 CoverageAnalysis]: Checked inductivity of 8256 backedges. 0 proven. 8256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:14:58,816 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:14:58,816 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 165 [2019-02-28 10:14:58,816 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:14:58,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2019-02-28 10:14:58,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2019-02-28 10:14:58,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11781, Invalid=15941, Unknown=0, NotChecked=0, Total=27722 [2019-02-28 10:14:58,819 INFO L87 Difference]: Start difference. First operand 261 states and 261 transitions. Second operand 132 states. [2019-02-28 10:14:59,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:14:59,288 INFO L93 Difference]: Finished difference Result 267 states and 267 transitions. [2019-02-28 10:14:59,288 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2019-02-28 10:14:59,289 INFO L78 Accepts]: Start accepts. Automaton has 132 states. Word has length 260 [2019-02-28 10:14:59,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:14:59,290 INFO L225 Difference]: With dead ends: 267 [2019-02-28 10:14:59,290 INFO L226 Difference]: Without dead ends: 266 [2019-02-28 10:14:59,290 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 583 GetRequests, 388 SyntacticMatches, 30 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17355 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=11781, Invalid=15941, Unknown=0, NotChecked=0, Total=27722 [2019-02-28 10:14:59,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2019-02-28 10:14:59,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 265. [2019-02-28 10:14:59,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 265 states. [2019-02-28 10:14:59,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 265 transitions. [2019-02-28 10:14:59,296 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 265 transitions. Word has length 260 [2019-02-28 10:14:59,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:14:59,297 INFO L480 AbstractCegarLoop]: Abstraction has 265 states and 265 transitions. [2019-02-28 10:14:59,297 INFO L481 AbstractCegarLoop]: Interpolant automaton has 132 states. [2019-02-28 10:14:59,297 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 265 transitions. [2019-02-28 10:14:59,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2019-02-28 10:14:59,298 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:14:59,298 INFO L402 BasicCegarLoop]: trace histogram [66, 66, 65, 65, 1, 1] [2019-02-28 10:14:59,298 INFO L423 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:14:59,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:14:59,299 INFO L82 PathProgramCache]: Analyzing trace with hash 1521144543, now seen corresponding path program 65 times [2019-02-28 10:14:59,299 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:14:59,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:14:59,300 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:14:59,300 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:14:59,300 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:14:59,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:15:01,699 INFO L134 CoverageAnalysis]: Checked inductivity of 8515 backedges. 0 proven. 8515 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:01,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:15:01,699 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:15:01,699 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:15:01,700 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:15:01,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:15:01,700 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 [2019-02-28 10:15:01,708 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:15:01,708 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:15:02,020 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2019-02-28 10:15:02,020 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:15:02,025 INFO L256 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 205 conjunts are in the unsatisfiable core [2019-02-28 10:15:02,027 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:15:02,031 INFO L442 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 [2019-02-28 10:15:02,031 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:15:02,044 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:15:02,044 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:15:04,526 INFO L134 CoverageAnalysis]: Checked inductivity of 8515 backedges. 0 proven. 8515 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:04,527 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:15:08,315 INFO L134 CoverageAnalysis]: Checked inductivity of 8515 backedges. 0 proven. 8515 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:08,334 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:15:08,334 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 166 [2019-02-28 10:15:08,334 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:15:08,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2019-02-28 10:15:08,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2019-02-28 10:15:08,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11883, Invalid=16173, Unknown=0, NotChecked=0, Total=28056 [2019-02-28 10:15:08,336 INFO L87 Difference]: Start difference. First operand 265 states and 265 transitions. Second operand 134 states. [2019-02-28 10:15:08,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:15:08,885 INFO L93 Difference]: Finished difference Result 271 states and 271 transitions. [2019-02-28 10:15:08,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2019-02-28 10:15:08,886 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 264 [2019-02-28 10:15:08,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:15:08,887 INFO L225 Difference]: With dead ends: 271 [2019-02-28 10:15:08,888 INFO L226 Difference]: Without dead ends: 270 [2019-02-28 10:15:08,888 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 394 SyntacticMatches, 32 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17852 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=11883, Invalid=16173, Unknown=0, NotChecked=0, Total=28056 [2019-02-28 10:15:08,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2019-02-28 10:15:08,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 269. [2019-02-28 10:15:08,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2019-02-28 10:15:08,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 269 transitions. [2019-02-28 10:15:08,894 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 269 transitions. Word has length 264 [2019-02-28 10:15:08,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:15:08,894 INFO L480 AbstractCegarLoop]: Abstraction has 269 states and 269 transitions. [2019-02-28 10:15:08,894 INFO L481 AbstractCegarLoop]: Interpolant automaton has 134 states. [2019-02-28 10:15:08,894 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 269 transitions. [2019-02-28 10:15:08,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2019-02-28 10:15:08,895 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:15:08,896 INFO L402 BasicCegarLoop]: trace histogram [67, 67, 66, 66, 1, 1] [2019-02-28 10:15:08,896 INFO L423 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:15:08,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:15:08,896 INFO L82 PathProgramCache]: Analyzing trace with hash -1857266792, now seen corresponding path program 66 times [2019-02-28 10:15:08,896 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:15:08,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:15:08,897 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:15:08,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:15:08,897 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:15:08,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:15:11,368 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 0 proven. 8778 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:11,368 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:15:11,368 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:15:11,368 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:15:11,368 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:15:11,368 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:15:11,368 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-02-28 10:15:11,377 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:15:11,377 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:15:11,459 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:15:11,459 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:15:11,464 INFO L256 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 208 conjunts are in the unsatisfiable core [2019-02-28 10:15:11,467 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:15:11,469 INFO L442 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 [2019-02-28 10:15:11,469 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:15:11,480 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:15:11,480 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:15:14,033 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 0 proven. 8778 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:14,033 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:15:17,949 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 0 proven. 8778 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:17,968 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:15:17,968 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 167 [2019-02-28 10:15:17,968 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:15:17,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 136 states [2019-02-28 10:15:17,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2019-02-28 10:15:17,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11985, Invalid=16407, Unknown=0, NotChecked=0, Total=28392 [2019-02-28 10:15:17,970 INFO L87 Difference]: Start difference. First operand 269 states and 269 transitions. Second operand 136 states. [2019-02-28 10:15:18,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:15:18,464 INFO L93 Difference]: Finished difference Result 275 states and 275 transitions. [2019-02-28 10:15:18,464 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2019-02-28 10:15:18,464 INFO L78 Accepts]: Start accepts. Automaton has 136 states. Word has length 268 [2019-02-28 10:15:18,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:15:18,466 INFO L225 Difference]: With dead ends: 275 [2019-02-28 10:15:18,466 INFO L226 Difference]: Without dead ends: 274 [2019-02-28 10:15:18,467 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 400 SyntacticMatches, 34 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18349 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=11985, Invalid=16407, Unknown=0, NotChecked=0, Total=28392 [2019-02-28 10:15:18,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2019-02-28 10:15:18,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 273. [2019-02-28 10:15:18,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 273 states. [2019-02-28 10:15:18,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 273 transitions. [2019-02-28 10:15:18,471 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 273 transitions. Word has length 268 [2019-02-28 10:15:18,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:15:18,471 INFO L480 AbstractCegarLoop]: Abstraction has 273 states and 273 transitions. [2019-02-28 10:15:18,471 INFO L481 AbstractCegarLoop]: Interpolant automaton has 136 states. [2019-02-28 10:15:18,471 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 273 transitions. [2019-02-28 10:15:18,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2019-02-28 10:15:18,472 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:15:18,473 INFO L402 BasicCegarLoop]: trace histogram [68, 68, 67, 67, 1, 1] [2019-02-28 10:15:18,473 INFO L423 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:15:18,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:15:18,473 INFO L82 PathProgramCache]: Analyzing trace with hash 370728913, now seen corresponding path program 67 times [2019-02-28 10:15:18,473 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:15:18,473 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:15:18,474 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:15:18,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:15:18,474 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:15:18,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:15:20,724 INFO L134 CoverageAnalysis]: Checked inductivity of 9045 backedges. 0 proven. 9045 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:20,724 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:15:20,724 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:15:20,724 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:15:20,724 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:15:20,724 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:15:20,724 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 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 [2019-02-28 10:15:20,733 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:15:20,733 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:15:20,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:15:20,809 INFO L256 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 211 conjunts are in the unsatisfiable core [2019-02-28 10:15:20,812 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:15:20,814 INFO L442 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 [2019-02-28 10:15:20,815 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:15:20,826 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:15:20,826 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:15:23,577 INFO L134 CoverageAnalysis]: Checked inductivity of 9045 backedges. 0 proven. 9045 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:23,577 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:15:27,445 INFO L134 CoverageAnalysis]: Checked inductivity of 9045 backedges. 0 proven. 9045 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:27,464 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:15:27,464 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 168 [2019-02-28 10:15:27,464 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:15:27,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 138 states [2019-02-28 10:15:27,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 138 interpolants. [2019-02-28 10:15:27,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12087, Invalid=16643, Unknown=0, NotChecked=0, Total=28730 [2019-02-28 10:15:27,466 INFO L87 Difference]: Start difference. First operand 273 states and 273 transitions. Second operand 138 states. [2019-02-28 10:15:28,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:15:28,046 INFO L93 Difference]: Finished difference Result 279 states and 279 transitions. [2019-02-28 10:15:28,046 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2019-02-28 10:15:28,046 INFO L78 Accepts]: Start accepts. Automaton has 138 states. Word has length 272 [2019-02-28 10:15:28,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:15:28,048 INFO L225 Difference]: With dead ends: 279 [2019-02-28 10:15:28,048 INFO L226 Difference]: Without dead ends: 278 [2019-02-28 10:15:28,049 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 610 GetRequests, 406 SyntacticMatches, 36 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18846 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=12087, Invalid=16643, Unknown=0, NotChecked=0, Total=28730 [2019-02-28 10:15:28,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2019-02-28 10:15:28,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 277. [2019-02-28 10:15:28,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2019-02-28 10:15:28,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 277 transitions. [2019-02-28 10:15:28,054 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 277 transitions. Word has length 272 [2019-02-28 10:15:28,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:15:28,055 INFO L480 AbstractCegarLoop]: Abstraction has 277 states and 277 transitions. [2019-02-28 10:15:28,055 INFO L481 AbstractCegarLoop]: Interpolant automaton has 138 states. [2019-02-28 10:15:28,055 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 277 transitions. [2019-02-28 10:15:28,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2019-02-28 10:15:28,056 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:15:28,056 INFO L402 BasicCegarLoop]: trace histogram [69, 69, 68, 68, 1, 1] [2019-02-28 10:15:28,057 INFO L423 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:15:28,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:15:28,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1675190390, now seen corresponding path program 68 times [2019-02-28 10:15:28,057 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:15:28,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:15:28,058 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:15:28,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:15:28,058 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:15:28,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:15:30,345 INFO L134 CoverageAnalysis]: Checked inductivity of 9316 backedges. 0 proven. 9316 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:30,345 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:15:30,345 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:15:30,346 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:15:30,346 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:15:30,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:15:30,346 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 [2019-02-28 10:15:30,353 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:15:30,354 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:15:30,687 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2019-02-28 10:15:30,688 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:15:30,692 INFO L256 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 214 conjunts are in the unsatisfiable core [2019-02-28 10:15:30,695 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:15:30,697 INFO L442 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 [2019-02-28 10:15:30,697 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:15:30,706 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:15:30,706 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:15:33,639 INFO L134 CoverageAnalysis]: Checked inductivity of 9316 backedges. 0 proven. 9316 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:33,639 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:15:37,811 INFO L134 CoverageAnalysis]: Checked inductivity of 9316 backedges. 0 proven. 9316 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:37,832 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:15:37,832 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 169 [2019-02-28 10:15:37,832 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:15:37,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2019-02-28 10:15:37,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2019-02-28 10:15:37,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12189, Invalid=16881, Unknown=0, NotChecked=0, Total=29070 [2019-02-28 10:15:37,835 INFO L87 Difference]: Start difference. First operand 277 states and 277 transitions. Second operand 140 states. [2019-02-28 10:15:38,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:15:38,340 INFO L93 Difference]: Finished difference Result 283 states and 283 transitions. [2019-02-28 10:15:38,340 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2019-02-28 10:15:38,341 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 276 [2019-02-28 10:15:38,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:15:38,342 INFO L225 Difference]: With dead ends: 283 [2019-02-28 10:15:38,342 INFO L226 Difference]: Without dead ends: 282 [2019-02-28 10:15:38,343 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 619 GetRequests, 412 SyntacticMatches, 38 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19343 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=12189, Invalid=16881, Unknown=0, NotChecked=0, Total=29070 [2019-02-28 10:15:38,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2019-02-28 10:15:38,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 281. [2019-02-28 10:15:38,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 281 states. [2019-02-28 10:15:38,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 281 transitions. [2019-02-28 10:15:38,350 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 281 transitions. Word has length 276 [2019-02-28 10:15:38,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:15:38,350 INFO L480 AbstractCegarLoop]: Abstraction has 281 states and 281 transitions. [2019-02-28 10:15:38,350 INFO L481 AbstractCegarLoop]: Interpolant automaton has 140 states. [2019-02-28 10:15:38,350 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 281 transitions. [2019-02-28 10:15:38,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 281 [2019-02-28 10:15:38,351 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:15:38,352 INFO L402 BasicCegarLoop]: trace histogram [70, 70, 69, 69, 1, 1] [2019-02-28 10:15:38,352 INFO L423 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:15:38,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:15:38,352 INFO L82 PathProgramCache]: Analyzing trace with hash -513025341, now seen corresponding path program 69 times [2019-02-28 10:15:38,352 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:15:38,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:15:38,353 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:15:38,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:15:38,353 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:15:38,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:15:40,658 INFO L134 CoverageAnalysis]: Checked inductivity of 9591 backedges. 0 proven. 9591 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:40,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:15:40,659 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:15:40,659 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:15:40,659 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:15:40,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:15:40,659 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 [2019-02-28 10:15:40,668 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:15:40,668 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:15:40,749 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:15:40,749 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:15:40,753 INFO L256 TraceCheckSpWp]: Trace formula consists of 506 conjuncts, 217 conjunts are in the unsatisfiable core [2019-02-28 10:15:40,756 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:15:40,760 INFO L442 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 [2019-02-28 10:15:40,760 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:15:40,768 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:15:40,768 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:15:43,758 INFO L134 CoverageAnalysis]: Checked inductivity of 9591 backedges. 0 proven. 9591 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:43,759 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:15:47,805 INFO L134 CoverageAnalysis]: Checked inductivity of 9591 backedges. 0 proven. 9591 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:47,824 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:15:47,824 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 170 [2019-02-28 10:15:47,825 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:15:47,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 142 states [2019-02-28 10:15:47,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2019-02-28 10:15:47,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12291, Invalid=17121, Unknown=0, NotChecked=0, Total=29412 [2019-02-28 10:15:47,827 INFO L87 Difference]: Start difference. First operand 281 states and 281 transitions. Second operand 142 states. [2019-02-28 10:15:48,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:15:48,390 INFO L93 Difference]: Finished difference Result 287 states and 287 transitions. [2019-02-28 10:15:48,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2019-02-28 10:15:48,390 INFO L78 Accepts]: Start accepts. Automaton has 142 states. Word has length 280 [2019-02-28 10:15:48,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:15:48,392 INFO L225 Difference]: With dead ends: 287 [2019-02-28 10:15:48,392 INFO L226 Difference]: Without dead ends: 286 [2019-02-28 10:15:48,393 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 628 GetRequests, 418 SyntacticMatches, 40 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19840 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=12291, Invalid=17121, Unknown=0, NotChecked=0, Total=29412 [2019-02-28 10:15:48,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2019-02-28 10:15:48,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 285. [2019-02-28 10:15:48,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 285 states. [2019-02-28 10:15:48,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 285 transitions. [2019-02-28 10:15:48,398 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 285 transitions. Word has length 280 [2019-02-28 10:15:48,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:15:48,398 INFO L480 AbstractCegarLoop]: Abstraction has 285 states and 285 transitions. [2019-02-28 10:15:48,399 INFO L481 AbstractCegarLoop]: Interpolant automaton has 142 states. [2019-02-28 10:15:48,399 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 285 transitions. [2019-02-28 10:15:48,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2019-02-28 10:15:48,400 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:15:48,400 INFO L402 BasicCegarLoop]: trace histogram [71, 71, 70, 70, 1, 1] [2019-02-28 10:15:48,400 INFO L423 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:15:48,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:15:48,400 INFO L82 PathProgramCache]: Analyzing trace with hash 1052692860, now seen corresponding path program 70 times [2019-02-28 10:15:48,400 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:15:48,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:15:48,401 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:15:48,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:15:48,401 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:15:48,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:15:50,710 INFO L134 CoverageAnalysis]: Checked inductivity of 9870 backedges. 0 proven. 9870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:50,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:15:50,711 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:15:50,711 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:15:50,711 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:15:50,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:15:50,711 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 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 [2019-02-28 10:15:50,719 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:15:50,719 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:15:50,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:15:50,798 INFO L256 TraceCheckSpWp]: Trace formula consists of 513 conjuncts, 220 conjunts are in the unsatisfiable core [2019-02-28 10:15:50,800 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:15:50,802 INFO L442 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 [2019-02-28 10:15:50,802 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:15:50,813 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:15:50,813 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:15:53,925 INFO L134 CoverageAnalysis]: Checked inductivity of 9870 backedges. 0 proven. 9870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:53,925 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:15:58,118 INFO L134 CoverageAnalysis]: Checked inductivity of 9870 backedges. 0 proven. 9870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:15:58,137 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:15:58,137 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 171 [2019-02-28 10:15:58,137 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:15:58,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 144 states [2019-02-28 10:15:58,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2019-02-28 10:15:58,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12393, Invalid=17363, Unknown=0, NotChecked=0, Total=29756 [2019-02-28 10:15:58,139 INFO L87 Difference]: Start difference. First operand 285 states and 285 transitions. Second operand 144 states. [2019-02-28 10:15:58,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:15:58,704 INFO L93 Difference]: Finished difference Result 291 states and 291 transitions. [2019-02-28 10:15:58,704 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2019-02-28 10:15:58,704 INFO L78 Accepts]: Start accepts. Automaton has 144 states. Word has length 284 [2019-02-28 10:15:58,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:15:58,706 INFO L225 Difference]: With dead ends: 291 [2019-02-28 10:15:58,706 INFO L226 Difference]: Without dead ends: 290 [2019-02-28 10:15:58,707 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 637 GetRequests, 424 SyntacticMatches, 42 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20337 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=12393, Invalid=17363, Unknown=0, NotChecked=0, Total=29756 [2019-02-28 10:15:58,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2019-02-28 10:15:58,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 289. [2019-02-28 10:15:58,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2019-02-28 10:15:58,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 289 transitions. [2019-02-28 10:15:58,712 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 289 transitions. Word has length 284 [2019-02-28 10:15:58,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:15:58,712 INFO L480 AbstractCegarLoop]: Abstraction has 289 states and 289 transitions. [2019-02-28 10:15:58,712 INFO L481 AbstractCegarLoop]: Interpolant automaton has 144 states. [2019-02-28 10:15:58,712 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 289 transitions. [2019-02-28 10:15:58,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2019-02-28 10:15:58,713 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:15:58,713 INFO L402 BasicCegarLoop]: trace histogram [72, 72, 71, 71, 1, 1] [2019-02-28 10:15:58,713 INFO L423 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:15:58,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:15:58,713 INFO L82 PathProgramCache]: Analyzing trace with hash 936756149, now seen corresponding path program 71 times [2019-02-28 10:15:58,713 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:15:58,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:15:58,714 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:15:58,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:15:58,714 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:15:58,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:16:01,164 INFO L134 CoverageAnalysis]: Checked inductivity of 10153 backedges. 0 proven. 10153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:16:01,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:16:01,165 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:16:01,165 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:16:01,165 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:16:01,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:16:01,165 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 [2019-02-28 10:16:01,173 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:16:01,173 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:16:01,537 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 72 check-sat command(s) [2019-02-28 10:16:01,537 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:16:01,542 INFO L256 TraceCheckSpWp]: Trace formula consists of 520 conjuncts, 223 conjunts are in the unsatisfiable core [2019-02-28 10:16:01,545 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:16:01,548 INFO L442 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 [2019-02-28 10:16:01,549 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:16:01,561 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:16:01,561 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:16:04,821 INFO L134 CoverageAnalysis]: Checked inductivity of 10153 backedges. 0 proven. 10153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:16:04,821 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:16:08,984 INFO L134 CoverageAnalysis]: Checked inductivity of 10153 backedges. 0 proven. 10153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:16:09,004 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:16:09,004 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 172 [2019-02-28 10:16:09,004 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:16:09,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2019-02-28 10:16:09,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2019-02-28 10:16:09,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12495, Invalid=17607, Unknown=0, NotChecked=0, Total=30102 [2019-02-28 10:16:09,007 INFO L87 Difference]: Start difference. First operand 289 states and 289 transitions. Second operand 146 states. [2019-02-28 10:16:09,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:16:09,587 INFO L93 Difference]: Finished difference Result 295 states and 295 transitions. [2019-02-28 10:16:09,587 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2019-02-28 10:16:09,587 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 288 [2019-02-28 10:16:09,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:16:09,589 INFO L225 Difference]: With dead ends: 295 [2019-02-28 10:16:09,589 INFO L226 Difference]: Without dead ends: 294 [2019-02-28 10:16:09,590 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 646 GetRequests, 430 SyntacticMatches, 44 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20834 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=12495, Invalid=17607, Unknown=0, NotChecked=0, Total=30102 [2019-02-28 10:16:09,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2019-02-28 10:16:09,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 293. [2019-02-28 10:16:09,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 293 states. [2019-02-28 10:16:09,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 293 transitions. [2019-02-28 10:16:09,595 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 293 transitions. Word has length 288 [2019-02-28 10:16:09,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:16:09,595 INFO L480 AbstractCegarLoop]: Abstraction has 293 states and 293 transitions. [2019-02-28 10:16:09,595 INFO L481 AbstractCegarLoop]: Interpolant automaton has 146 states. [2019-02-28 10:16:09,595 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 293 transitions. [2019-02-28 10:16:09,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2019-02-28 10:16:09,597 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:16:09,597 INFO L402 BasicCegarLoop]: trace histogram [73, 73, 72, 72, 1, 1] [2019-02-28 10:16:09,597 INFO L423 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:16:09,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:16:09,598 INFO L82 PathProgramCache]: Analyzing trace with hash 189198702, now seen corresponding path program 72 times [2019-02-28 10:16:09,598 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:16:09,598 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:16:09,598 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:16:09,598 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:16:09,598 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:16:09,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:16:12,105 INFO L134 CoverageAnalysis]: Checked inductivity of 10440 backedges. 0 proven. 10440 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:16:12,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:16:12,105 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:16:12,106 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:16:12,106 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:16:12,106 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:16:12,106 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 [2019-02-28 10:16:12,114 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:16:12,114 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:16:12,207 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:16:12,207 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:16:12,213 INFO L256 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 226 conjunts are in the unsatisfiable core [2019-02-28 10:16:12,217 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:16:12,232 INFO L442 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 [2019-02-28 10:16:12,232 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:16:12,248 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:16:12,248 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:16:15,290 INFO L134 CoverageAnalysis]: Checked inductivity of 10440 backedges. 0 proven. 10440 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:16:15,290 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:16:19,366 INFO L134 CoverageAnalysis]: Checked inductivity of 10440 backedges. 0 proven. 10440 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:16:19,386 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:16:19,386 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 173 [2019-02-28 10:16:19,386 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:16:19,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 148 states [2019-02-28 10:16:19,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2019-02-28 10:16:19,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12597, Invalid=17853, Unknown=0, NotChecked=0, Total=30450 [2019-02-28 10:16:19,389 INFO L87 Difference]: Start difference. First operand 293 states and 293 transitions. Second operand 148 states. [2019-02-28 10:16:20,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:16:20,047 INFO L93 Difference]: Finished difference Result 299 states and 299 transitions. [2019-02-28 10:16:20,047 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2019-02-28 10:16:20,047 INFO L78 Accepts]: Start accepts. Automaton has 148 states. Word has length 292 [2019-02-28 10:16:20,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:16:20,049 INFO L225 Difference]: With dead ends: 299 [2019-02-28 10:16:20,049 INFO L226 Difference]: Without dead ends: 298 [2019-02-28 10:16:20,050 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 436 SyntacticMatches, 46 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21331 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=12597, Invalid=17853, Unknown=0, NotChecked=0, Total=30450 [2019-02-28 10:16:20,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2019-02-28 10:16:20,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 297. [2019-02-28 10:16:20,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 297 states. [2019-02-28 10:16:20,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 297 transitions. [2019-02-28 10:16:20,056 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 297 transitions. Word has length 292 [2019-02-28 10:16:20,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:16:20,056 INFO L480 AbstractCegarLoop]: Abstraction has 297 states and 297 transitions. [2019-02-28 10:16:20,056 INFO L481 AbstractCegarLoop]: Interpolant automaton has 148 states. [2019-02-28 10:16:20,056 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 297 transitions. [2019-02-28 10:16:20,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2019-02-28 10:16:20,057 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:16:20,057 INFO L402 BasicCegarLoop]: trace histogram [74, 74, 73, 73, 1, 1] [2019-02-28 10:16:20,057 INFO L423 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:16:20,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:16:20,057 INFO L82 PathProgramCache]: Analyzing trace with hash 1116248743, now seen corresponding path program 73 times [2019-02-28 10:16:20,058 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:16:20,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:16:20,058 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:16:20,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:16:20,058 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:16:20,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:16:22,898 INFO L134 CoverageAnalysis]: Checked inductivity of 10731 backedges. 0 proven. 10731 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:16:22,898 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:16:22,898 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:16:22,898 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:16:22,898 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:16:22,898 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:16:22,898 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 [2019-02-28 10:16:22,907 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:16:22,907 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:16:22,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:16:22,989 INFO L256 TraceCheckSpWp]: Trace formula consists of 534 conjuncts, 229 conjunts are in the unsatisfiable core [2019-02-28 10:16:22,993 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:16:22,995 INFO L442 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 [2019-02-28 10:16:22,995 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:16:23,006 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:16:23,006 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:16:26,083 INFO L134 CoverageAnalysis]: Checked inductivity of 10731 backedges. 0 proven. 10731 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:16:26,083 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:16:30,391 INFO L134 CoverageAnalysis]: Checked inductivity of 10731 backedges. 0 proven. 10731 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:16:30,410 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:16:30,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 174 [2019-02-28 10:16:30,410 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:16:30,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 150 states [2019-02-28 10:16:30,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 150 interpolants. [2019-02-28 10:16:30,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12699, Invalid=18101, Unknown=0, NotChecked=0, Total=30800 [2019-02-28 10:16:30,413 INFO L87 Difference]: Start difference. First operand 297 states and 297 transitions. Second operand 150 states. [2019-02-28 10:16:30,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:16:30,928 INFO L93 Difference]: Finished difference Result 303 states and 303 transitions. [2019-02-28 10:16:30,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2019-02-28 10:16:30,928 INFO L78 Accepts]: Start accepts. Automaton has 150 states. Word has length 296 [2019-02-28 10:16:30,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:16:30,930 INFO L225 Difference]: With dead ends: 303 [2019-02-28 10:16:30,930 INFO L226 Difference]: Without dead ends: 302 [2019-02-28 10:16:30,931 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 664 GetRequests, 442 SyntacticMatches, 48 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21828 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=12699, Invalid=18101, Unknown=0, NotChecked=0, Total=30800 [2019-02-28 10:16:30,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2019-02-28 10:16:30,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 301. [2019-02-28 10:16:30,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 301 states. [2019-02-28 10:16:30,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 301 transitions. [2019-02-28 10:16:30,936 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 301 transitions. Word has length 296 [2019-02-28 10:16:30,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:16:30,936 INFO L480 AbstractCegarLoop]: Abstraction has 301 states and 301 transitions. [2019-02-28 10:16:30,936 INFO L481 AbstractCegarLoop]: Interpolant automaton has 150 states. [2019-02-28 10:16:30,936 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 301 transitions. [2019-02-28 10:16:30,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2019-02-28 10:16:30,937 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:16:30,937 INFO L402 BasicCegarLoop]: trace histogram [75, 75, 74, 74, 1, 1] [2019-02-28 10:16:30,937 INFO L423 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:16:30,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:16:30,937 INFO L82 PathProgramCache]: Analyzing trace with hash 1106313056, now seen corresponding path program 74 times [2019-02-28 10:16:30,938 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:16:30,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:16:30,938 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:16:30,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:16:30,938 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:16:30,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:16:33,853 INFO L134 CoverageAnalysis]: Checked inductivity of 11026 backedges. 0 proven. 11026 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:16:33,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:16:33,854 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:16:33,854 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:16:33,854 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:16:33,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:16:33,854 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 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 [2019-02-28 10:16:33,862 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:16:33,862 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:16:34,247 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 75 check-sat command(s) [2019-02-28 10:16:34,247 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:16:34,252 INFO L256 TraceCheckSpWp]: Trace formula consists of 541 conjuncts, 232 conjunts are in the unsatisfiable core [2019-02-28 10:16:34,256 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:16:34,262 INFO L442 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 [2019-02-28 10:16:34,262 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:16:34,271 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:16:34,271 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:16:37,431 INFO L134 CoverageAnalysis]: Checked inductivity of 11026 backedges. 0 proven. 11026 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:16:37,432 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:16:41,530 INFO L134 CoverageAnalysis]: Checked inductivity of 11026 backedges. 0 proven. 11026 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:16:41,549 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:16:41,549 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 175 [2019-02-28 10:16:41,549 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:16:41,550 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2019-02-28 10:16:41,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2019-02-28 10:16:41,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12801, Invalid=18351, Unknown=0, NotChecked=0, Total=31152 [2019-02-28 10:16:41,552 INFO L87 Difference]: Start difference. First operand 301 states and 301 transitions. Second operand 152 states. [2019-02-28 10:16:42,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:16:42,201 INFO L93 Difference]: Finished difference Result 307 states and 307 transitions. [2019-02-28 10:16:42,202 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2019-02-28 10:16:42,202 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 300 [2019-02-28 10:16:42,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:16:42,204 INFO L225 Difference]: With dead ends: 307 [2019-02-28 10:16:42,204 INFO L226 Difference]: Without dead ends: 306 [2019-02-28 10:16:42,204 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 673 GetRequests, 448 SyntacticMatches, 50 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22325 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=12801, Invalid=18351, Unknown=0, NotChecked=0, Total=31152 [2019-02-28 10:16:42,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2019-02-28 10:16:42,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 305. [2019-02-28 10:16:42,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 305 states. [2019-02-28 10:16:42,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 305 transitions. [2019-02-28 10:16:42,211 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 305 transitions. Word has length 300 [2019-02-28 10:16:42,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:16:42,211 INFO L480 AbstractCegarLoop]: Abstraction has 305 states and 305 transitions. [2019-02-28 10:16:42,211 INFO L481 AbstractCegarLoop]: Interpolant automaton has 152 states. [2019-02-28 10:16:42,211 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 305 transitions. [2019-02-28 10:16:42,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2019-02-28 10:16:42,212 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:16:42,213 INFO L402 BasicCegarLoop]: trace histogram [76, 76, 75, 75, 1, 1] [2019-02-28 10:16:42,213 INFO L423 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:16:42,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:16:42,213 INFO L82 PathProgramCache]: Analyzing trace with hash -659136615, now seen corresponding path program 75 times [2019-02-28 10:16:42,213 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:16:42,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:16:42,214 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:16:42,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:16:42,214 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:16:42,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:16:45,130 INFO L134 CoverageAnalysis]: Checked inductivity of 11325 backedges. 0 proven. 11325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:16:45,130 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:16:45,130 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:16:45,130 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:16:45,131 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:16:45,131 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:16:45,131 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 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 [2019-02-28 10:16:45,138 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:16:45,138 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:16:45,229 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:16:45,229 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:16:45,234 INFO L256 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 235 conjunts are in the unsatisfiable core [2019-02-28 10:16:45,237 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:16:45,239 INFO L442 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 [2019-02-28 10:16:45,239 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:16:45,251 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:16:45,251 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:16:48,640 INFO L134 CoverageAnalysis]: Checked inductivity of 11325 backedges. 0 proven. 11325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:16:48,640 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:16:52,624 INFO L134 CoverageAnalysis]: Checked inductivity of 11325 backedges. 0 proven. 11325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:16:52,644 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:16:52,644 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 176 [2019-02-28 10:16:52,644 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:16:52,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 154 states [2019-02-28 10:16:52,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2019-02-28 10:16:52,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12903, Invalid=18603, Unknown=0, NotChecked=0, Total=31506 [2019-02-28 10:16:52,647 INFO L87 Difference]: Start difference. First operand 305 states and 305 transitions. Second operand 154 states. [2019-02-28 10:16:53,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:16:53,318 INFO L93 Difference]: Finished difference Result 311 states and 311 transitions. [2019-02-28 10:16:53,318 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2019-02-28 10:16:53,319 INFO L78 Accepts]: Start accepts. Automaton has 154 states. Word has length 304 [2019-02-28 10:16:53,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:16:53,321 INFO L225 Difference]: With dead ends: 311 [2019-02-28 10:16:53,321 INFO L226 Difference]: Without dead ends: 310 [2019-02-28 10:16:53,322 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 454 SyntacticMatches, 52 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22822 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=12903, Invalid=18603, Unknown=0, NotChecked=0, Total=31506 [2019-02-28 10:16:53,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2019-02-28 10:16:53,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 309. [2019-02-28 10:16:53,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 309 states. [2019-02-28 10:16:53,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 309 transitions. [2019-02-28 10:16:53,327 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 309 transitions. Word has length 304 [2019-02-28 10:16:53,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:16:53,327 INFO L480 AbstractCegarLoop]: Abstraction has 309 states and 309 transitions. [2019-02-28 10:16:53,327 INFO L481 AbstractCegarLoop]: Interpolant automaton has 154 states. [2019-02-28 10:16:53,327 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 309 transitions. [2019-02-28 10:16:53,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 309 [2019-02-28 10:16:53,329 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:16:53,329 INFO L402 BasicCegarLoop]: trace histogram [77, 77, 76, 76, 1, 1] [2019-02-28 10:16:53,329 INFO L423 AbstractCegarLoop]: === Iteration 77 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:16:53,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:16:53,330 INFO L82 PathProgramCache]: Analyzing trace with hash -789644462, now seen corresponding path program 76 times [2019-02-28 10:16:53,330 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:16:53,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:16:53,330 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:16:53,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:16:53,330 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:16:53,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:16:56,083 INFO L134 CoverageAnalysis]: Checked inductivity of 11628 backedges. 0 proven. 11628 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:16:56,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:16:56,084 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:16:56,084 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:16:56,084 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:16:56,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:16:56,084 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 [2019-02-28 10:16:56,092 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:16:56,092 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:16:56,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:16:56,178 INFO L256 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 238 conjunts are in the unsatisfiable core [2019-02-28 10:16:56,180 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:16:56,183 INFO L442 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 [2019-02-28 10:16:56,183 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:16:56,195 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:16:56,195 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:16:59,730 INFO L134 CoverageAnalysis]: Checked inductivity of 11628 backedges. 0 proven. 11628 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:16:59,730 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:17:03,911 INFO L134 CoverageAnalysis]: Checked inductivity of 11628 backedges. 0 proven. 11628 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:17:03,930 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:17:03,930 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 177 [2019-02-28 10:17:03,930 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:17:03,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 156 states [2019-02-28 10:17:03,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 156 interpolants. [2019-02-28 10:17:03,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13005, Invalid=18857, Unknown=0, NotChecked=0, Total=31862 [2019-02-28 10:17:03,932 INFO L87 Difference]: Start difference. First operand 309 states and 309 transitions. Second operand 156 states. [2019-02-28 10:17:04,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:17:04,552 INFO L93 Difference]: Finished difference Result 315 states and 315 transitions. [2019-02-28 10:17:04,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2019-02-28 10:17:04,552 INFO L78 Accepts]: Start accepts. Automaton has 156 states. Word has length 308 [2019-02-28 10:17:04,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:17:04,554 INFO L225 Difference]: With dead ends: 315 [2019-02-28 10:17:04,554 INFO L226 Difference]: Without dead ends: 314 [2019-02-28 10:17:04,555 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 691 GetRequests, 460 SyntacticMatches, 54 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23319 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=13005, Invalid=18857, Unknown=0, NotChecked=0, Total=31862 [2019-02-28 10:17:04,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2019-02-28 10:17:04,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 313. [2019-02-28 10:17:04,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 313 states. [2019-02-28 10:17:04,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 313 transitions. [2019-02-28 10:17:04,560 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 313 transitions. Word has length 308 [2019-02-28 10:17:04,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:17:04,560 INFO L480 AbstractCegarLoop]: Abstraction has 313 states and 313 transitions. [2019-02-28 10:17:04,560 INFO L481 AbstractCegarLoop]: Interpolant automaton has 156 states. [2019-02-28 10:17:04,560 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 313 transitions. [2019-02-28 10:17:04,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 313 [2019-02-28 10:17:04,561 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:17:04,561 INFO L402 BasicCegarLoop]: trace histogram [78, 78, 77, 77, 1, 1] [2019-02-28 10:17:04,561 INFO L423 AbstractCegarLoop]: === Iteration 78 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:17:04,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:17:04,562 INFO L82 PathProgramCache]: Analyzing trace with hash 2140213899, now seen corresponding path program 77 times [2019-02-28 10:17:04,562 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:17:04,562 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:17:04,562 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:17:04,562 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:17:04,562 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:17:04,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:17:07,387 INFO L134 CoverageAnalysis]: Checked inductivity of 11935 backedges. 0 proven. 11935 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:17:07,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:17:07,387 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:17:07,387 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:17:07,387 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:17:07,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:17:07,388 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 [2019-02-28 10:17:07,395 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:17:07,396 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:17:07,820 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2019-02-28 10:17:07,820 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:17:07,826 INFO L256 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 241 conjunts are in the unsatisfiable core [2019-02-28 10:17:07,829 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:17:07,833 INFO L442 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 [2019-02-28 10:17:07,834 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:17:07,845 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:17:07,845 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:17:11,545 INFO L134 CoverageAnalysis]: Checked inductivity of 11935 backedges. 0 proven. 11935 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:17:11,545 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:17:15,841 INFO L134 CoverageAnalysis]: Checked inductivity of 11935 backedges. 0 proven. 11935 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:17:15,861 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:17:15,861 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78, 78] total 178 [2019-02-28 10:17:15,861 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:17:15,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2019-02-28 10:17:15,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2019-02-28 10:17:15,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13107, Invalid=19113, Unknown=0, NotChecked=0, Total=32220 [2019-02-28 10:17:15,863 INFO L87 Difference]: Start difference. First operand 313 states and 313 transitions. Second operand 158 states. [2019-02-28 10:17:16,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:17:16,489 INFO L93 Difference]: Finished difference Result 319 states and 319 transitions. [2019-02-28 10:17:16,489 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2019-02-28 10:17:16,489 INFO L78 Accepts]: Start accepts. Automaton has 158 states. Word has length 312 [2019-02-28 10:17:16,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:17:16,491 INFO L225 Difference]: With dead ends: 319 [2019-02-28 10:17:16,491 INFO L226 Difference]: Without dead ends: 318 [2019-02-28 10:17:16,493 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 700 GetRequests, 466 SyntacticMatches, 56 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23816 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=13107, Invalid=19113, Unknown=0, NotChecked=0, Total=32220 [2019-02-28 10:17:16,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2019-02-28 10:17:16,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 317. [2019-02-28 10:17:16,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 317 states. [2019-02-28 10:17:16,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 317 transitions. [2019-02-28 10:17:16,497 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 317 transitions. Word has length 312 [2019-02-28 10:17:16,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:17:16,498 INFO L480 AbstractCegarLoop]: Abstraction has 317 states and 317 transitions. [2019-02-28 10:17:16,498 INFO L481 AbstractCegarLoop]: Interpolant automaton has 158 states. [2019-02-28 10:17:16,498 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 317 transitions. [2019-02-28 10:17:16,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2019-02-28 10:17:16,499 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:17:16,499 INFO L402 BasicCegarLoop]: trace histogram [79, 79, 78, 78, 1, 1] [2019-02-28 10:17:16,499 INFO L423 AbstractCegarLoop]: === Iteration 79 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:17:16,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:17:16,499 INFO L82 PathProgramCache]: Analyzing trace with hash 1416815940, now seen corresponding path program 78 times [2019-02-28 10:17:16,499 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:17:16,500 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:17:16,500 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:17:16,500 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:17:16,500 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:17:16,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:17:19,458 INFO L134 CoverageAnalysis]: Checked inductivity of 12246 backedges. 0 proven. 12246 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:17:19,459 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:17:19,459 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:17:19,459 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:17:19,459 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:17:19,459 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:17:19,459 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 [2019-02-28 10:17:19,467 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:17:19,467 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:17:19,561 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:17:19,561 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:17:19,567 INFO L256 TraceCheckSpWp]: Trace formula consists of 569 conjuncts, 244 conjunts are in the unsatisfiable core [2019-02-28 10:17:19,570 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:17:19,573 INFO L442 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 [2019-02-28 10:17:19,574 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:17:19,582 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:17:19,582 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:17:23,025 INFO L134 CoverageAnalysis]: Checked inductivity of 12246 backedges. 0 proven. 12246 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:17:23,026 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:17:27,317 INFO L134 CoverageAnalysis]: Checked inductivity of 12246 backedges. 0 proven. 12246 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:17:27,336 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:17:27,336 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 179 [2019-02-28 10:17:27,336 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:17:27,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 160 states [2019-02-28 10:17:27,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2019-02-28 10:17:27,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13209, Invalid=19371, Unknown=0, NotChecked=0, Total=32580 [2019-02-28 10:17:27,339 INFO L87 Difference]: Start difference. First operand 317 states and 317 transitions. Second operand 160 states. [2019-02-28 10:17:28,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:17:28,025 INFO L93 Difference]: Finished difference Result 323 states and 323 transitions. [2019-02-28 10:17:28,025 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2019-02-28 10:17:28,025 INFO L78 Accepts]: Start accepts. Automaton has 160 states. Word has length 316 [2019-02-28 10:17:28,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:17:28,026 INFO L225 Difference]: With dead ends: 323 [2019-02-28 10:17:28,026 INFO L226 Difference]: Without dead ends: 322 [2019-02-28 10:17:28,027 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 709 GetRequests, 472 SyntacticMatches, 58 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24313 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=13209, Invalid=19371, Unknown=0, NotChecked=0, Total=32580 [2019-02-28 10:17:28,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2019-02-28 10:17:28,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 321. [2019-02-28 10:17:28,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 321 states. [2019-02-28 10:17:28,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 321 states to 321 states and 321 transitions. [2019-02-28 10:17:28,032 INFO L78 Accepts]: Start accepts. Automaton has 321 states and 321 transitions. Word has length 316 [2019-02-28 10:17:28,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:17:28,032 INFO L480 AbstractCegarLoop]: Abstraction has 321 states and 321 transitions. [2019-02-28 10:17:28,032 INFO L481 AbstractCegarLoop]: Interpolant automaton has 160 states. [2019-02-28 10:17:28,032 INFO L276 IsEmpty]: Start isEmpty. Operand 321 states and 321 transitions. [2019-02-28 10:17:28,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2019-02-28 10:17:28,033 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:17:28,033 INFO L402 BasicCegarLoop]: trace histogram [80, 80, 79, 79, 1, 1] [2019-02-28 10:17:28,034 INFO L423 AbstractCegarLoop]: === Iteration 80 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:17:28,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:17:28,034 INFO L82 PathProgramCache]: Analyzing trace with hash 1783280509, now seen corresponding path program 79 times [2019-02-28 10:17:28,034 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:17:28,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:17:28,034 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:17:28,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:17:28,035 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:17:28,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:17:31,185 INFO L134 CoverageAnalysis]: Checked inductivity of 12561 backedges. 0 proven. 12561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:17:31,185 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:17:31,185 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:17:31,185 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:17:31,185 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:17:31,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:17:31,186 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 [2019-02-28 10:17:31,194 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:17:31,194 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:17:31,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:17:31,281 INFO L256 TraceCheckSpWp]: Trace formula consists of 576 conjuncts, 247 conjunts are in the unsatisfiable core [2019-02-28 10:17:31,284 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:17:31,288 INFO L442 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 [2019-02-28 10:17:31,288 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:17:31,300 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:17:31,300 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:17:35,012 INFO L134 CoverageAnalysis]: Checked inductivity of 12561 backedges. 0 proven. 12561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:17:35,012 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:17:39,090 INFO L134 CoverageAnalysis]: Checked inductivity of 12561 backedges. 0 proven. 12561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:17:39,109 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:17:39,110 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 180 [2019-02-28 10:17:39,110 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:17:39,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 162 states [2019-02-28 10:17:39,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 162 interpolants. [2019-02-28 10:17:39,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13311, Invalid=19631, Unknown=0, NotChecked=0, Total=32942 [2019-02-28 10:17:39,112 INFO L87 Difference]: Start difference. First operand 321 states and 321 transitions. Second operand 162 states. [2019-02-28 10:17:39,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:17:39,818 INFO L93 Difference]: Finished difference Result 327 states and 327 transitions. [2019-02-28 10:17:39,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2019-02-28 10:17:39,818 INFO L78 Accepts]: Start accepts. Automaton has 162 states. Word has length 320 [2019-02-28 10:17:39,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:17:39,820 INFO L225 Difference]: With dead ends: 327 [2019-02-28 10:17:39,820 INFO L226 Difference]: Without dead ends: 326 [2019-02-28 10:17:39,821 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 718 GetRequests, 478 SyntacticMatches, 60 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24810 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=13311, Invalid=19631, Unknown=0, NotChecked=0, Total=32942 [2019-02-28 10:17:39,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2019-02-28 10:17:39,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 325. [2019-02-28 10:17:39,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 325 states. [2019-02-28 10:17:39,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 325 transitions. [2019-02-28 10:17:39,825 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 325 transitions. Word has length 320 [2019-02-28 10:17:39,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:17:39,825 INFO L480 AbstractCegarLoop]: Abstraction has 325 states and 325 transitions. [2019-02-28 10:17:39,825 INFO L481 AbstractCegarLoop]: Interpolant automaton has 162 states. [2019-02-28 10:17:39,826 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 325 transitions. [2019-02-28 10:17:39,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2019-02-28 10:17:39,827 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:17:39,827 INFO L402 BasicCegarLoop]: trace histogram [81, 81, 80, 80, 1, 1] [2019-02-28 10:17:39,827 INFO L423 AbstractCegarLoop]: === Iteration 81 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:17:39,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:17:39,827 INFO L82 PathProgramCache]: Analyzing trace with hash 380550454, now seen corresponding path program 80 times [2019-02-28 10:17:39,827 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:17:39,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:17:39,828 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:17:39,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:17:39,828 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:17:39,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:17:42,920 INFO L134 CoverageAnalysis]: Checked inductivity of 12880 backedges. 0 proven. 12880 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:17:42,920 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:17:42,920 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:17:42,920 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:17:42,920 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:17:42,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:17:42,921 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 [2019-02-28 10:17:42,929 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:17:42,929 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:17:43,384 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 81 check-sat command(s) [2019-02-28 10:17:43,384 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:17:43,390 INFO L256 TraceCheckSpWp]: Trace formula consists of 583 conjuncts, 250 conjunts are in the unsatisfiable core [2019-02-28 10:17:43,393 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:17:43,395 INFO L442 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 [2019-02-28 10:17:43,395 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:17:43,406 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:17:43,406 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:17:47,292 INFO L134 CoverageAnalysis]: Checked inductivity of 12880 backedges. 0 proven. 12880 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:17:47,292 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:17:51,519 INFO L134 CoverageAnalysis]: Checked inductivity of 12880 backedges. 0 proven. 12880 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:17:51,537 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:17:51,538 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 181 [2019-02-28 10:17:51,538 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:17:51,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 164 states [2019-02-28 10:17:51,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2019-02-28 10:17:51,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13413, Invalid=19893, Unknown=0, NotChecked=0, Total=33306 [2019-02-28 10:17:51,540 INFO L87 Difference]: Start difference. First operand 325 states and 325 transitions. Second operand 164 states. [2019-02-28 10:17:52,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:17:52,228 INFO L93 Difference]: Finished difference Result 331 states and 331 transitions. [2019-02-28 10:17:52,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2019-02-28 10:17:52,228 INFO L78 Accepts]: Start accepts. Automaton has 164 states. Word has length 324 [2019-02-28 10:17:52,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:17:52,230 INFO L225 Difference]: With dead ends: 331 [2019-02-28 10:17:52,230 INFO L226 Difference]: Without dead ends: 330 [2019-02-28 10:17:52,232 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 727 GetRequests, 484 SyntacticMatches, 62 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25307 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=13413, Invalid=19893, Unknown=0, NotChecked=0, Total=33306 [2019-02-28 10:17:52,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2019-02-28 10:17:52,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 329. [2019-02-28 10:17:52,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 329 states. [2019-02-28 10:17:52,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 329 transitions. [2019-02-28 10:17:52,236 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 329 transitions. Word has length 324 [2019-02-28 10:17:52,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:17:52,237 INFO L480 AbstractCegarLoop]: Abstraction has 329 states and 329 transitions. [2019-02-28 10:17:52,237 INFO L481 AbstractCegarLoop]: Interpolant automaton has 164 states. [2019-02-28 10:17:52,237 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 329 transitions. [2019-02-28 10:17:52,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 329 [2019-02-28 10:17:52,238 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:17:52,238 INFO L402 BasicCegarLoop]: trace histogram [82, 82, 81, 81, 1, 1] [2019-02-28 10:17:52,238 INFO L423 AbstractCegarLoop]: === Iteration 82 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:17:52,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:17:52,238 INFO L82 PathProgramCache]: Analyzing trace with hash 2048213615, now seen corresponding path program 81 times [2019-02-28 10:17:52,238 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:17:52,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:17:52,239 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:17:52,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:17:52,239 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:17:52,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:17:55,613 INFO L134 CoverageAnalysis]: Checked inductivity of 13203 backedges. 0 proven. 13203 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:17:55,613 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:17:55,613 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:17:55,613 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:17:55,613 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:17:55,613 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:17:55,613 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 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 [2019-02-28 10:17:55,621 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:17:55,621 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:17:55,721 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:17:55,721 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:17:55,726 INFO L256 TraceCheckSpWp]: Trace formula consists of 590 conjuncts, 253 conjunts are in the unsatisfiable core [2019-02-28 10:17:55,729 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:17:55,731 INFO L442 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 [2019-02-28 10:17:55,731 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:17:55,739 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:17:55,739 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:17:59,437 INFO L134 CoverageAnalysis]: Checked inductivity of 13203 backedges. 0 proven. 13203 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:17:59,437 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:18:03,856 INFO L134 CoverageAnalysis]: Checked inductivity of 13203 backedges. 0 proven. 13203 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:18:03,875 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:18:03,875 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82, 82] total 182 [2019-02-28 10:18:03,875 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:18:03,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 166 states [2019-02-28 10:18:03,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 166 interpolants. [2019-02-28 10:18:03,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13515, Invalid=20157, Unknown=0, NotChecked=0, Total=33672 [2019-02-28 10:18:03,878 INFO L87 Difference]: Start difference. First operand 329 states and 329 transitions. Second operand 166 states. [2019-02-28 10:18:04,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:18:04,551 INFO L93 Difference]: Finished difference Result 335 states and 335 transitions. [2019-02-28 10:18:04,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2019-02-28 10:18:04,552 INFO L78 Accepts]: Start accepts. Automaton has 166 states. Word has length 328 [2019-02-28 10:18:04,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:18:04,554 INFO L225 Difference]: With dead ends: 335 [2019-02-28 10:18:04,554 INFO L226 Difference]: Without dead ends: 334 [2019-02-28 10:18:04,555 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 736 GetRequests, 490 SyntacticMatches, 64 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25804 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=13515, Invalid=20157, Unknown=0, NotChecked=0, Total=33672 [2019-02-28 10:18:04,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2019-02-28 10:18:04,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 333. [2019-02-28 10:18:04,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 333 states. [2019-02-28 10:18:04,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 333 transitions. [2019-02-28 10:18:04,560 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 333 transitions. Word has length 328 [2019-02-28 10:18:04,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:18:04,560 INFO L480 AbstractCegarLoop]: Abstraction has 333 states and 333 transitions. [2019-02-28 10:18:04,560 INFO L481 AbstractCegarLoop]: Interpolant automaton has 166 states. [2019-02-28 10:18:04,561 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 333 transitions. [2019-02-28 10:18:04,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2019-02-28 10:18:04,561 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:18:04,562 INFO L402 BasicCegarLoop]: trace histogram [83, 83, 82, 82, 1, 1] [2019-02-28 10:18:04,562 INFO L423 AbstractCegarLoop]: === Iteration 83 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:18:04,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:18:04,562 INFO L82 PathProgramCache]: Analyzing trace with hash 265585448, now seen corresponding path program 82 times [2019-02-28 10:18:04,562 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:18:04,563 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:18:04,563 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:18:04,563 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:18:04,563 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:18:04,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:18:07,865 INFO L134 CoverageAnalysis]: Checked inductivity of 13530 backedges. 0 proven. 13530 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:18:07,865 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:18:07,865 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:18:07,865 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:18:07,866 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:18:07,866 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:18:07,866 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 [2019-02-28 10:18:07,874 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:18:07,875 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:18:07,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:18:07,965 INFO L256 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 256 conjunts are in the unsatisfiable core [2019-02-28 10:18:07,968 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:18:07,974 INFO L442 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 [2019-02-28 10:18:07,974 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:18:07,986 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:18:07,986 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:18:12,017 INFO L134 CoverageAnalysis]: Checked inductivity of 13530 backedges. 0 proven. 13530 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:18:12,017 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:18:16,295 INFO L134 CoverageAnalysis]: Checked inductivity of 13530 backedges. 0 proven. 13530 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:18:16,314 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:18:16,314 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 183 [2019-02-28 10:18:16,314 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:18:16,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 168 states [2019-02-28 10:18:16,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 168 interpolants. [2019-02-28 10:18:16,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13617, Invalid=20423, Unknown=0, NotChecked=0, Total=34040 [2019-02-28 10:18:16,317 INFO L87 Difference]: Start difference. First operand 333 states and 333 transitions. Second operand 168 states. [2019-02-28 10:18:16,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:18:16,976 INFO L93 Difference]: Finished difference Result 339 states and 339 transitions. [2019-02-28 10:18:16,976 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2019-02-28 10:18:16,976 INFO L78 Accepts]: Start accepts. Automaton has 168 states. Word has length 332 [2019-02-28 10:18:16,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:18:16,978 INFO L225 Difference]: With dead ends: 339 [2019-02-28 10:18:16,978 INFO L226 Difference]: Without dead ends: 338 [2019-02-28 10:18:16,978 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 745 GetRequests, 496 SyntacticMatches, 66 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26301 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=13617, Invalid=20423, Unknown=0, NotChecked=0, Total=34040 [2019-02-28 10:18:16,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2019-02-28 10:18:16,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 337. [2019-02-28 10:18:16,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2019-02-28 10:18:16,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 337 transitions. [2019-02-28 10:18:16,984 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 337 transitions. Word has length 332 [2019-02-28 10:18:16,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:18:16,984 INFO L480 AbstractCegarLoop]: Abstraction has 337 states and 337 transitions. [2019-02-28 10:18:16,984 INFO L481 AbstractCegarLoop]: Interpolant automaton has 168 states. [2019-02-28 10:18:16,984 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 337 transitions. [2019-02-28 10:18:16,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2019-02-28 10:18:16,985 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:18:16,985 INFO L402 BasicCegarLoop]: trace histogram [84, 84, 83, 83, 1, 1] [2019-02-28 10:18:16,986 INFO L423 AbstractCegarLoop]: === Iteration 84 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:18:16,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:18:16,986 INFO L82 PathProgramCache]: Analyzing trace with hash 1042464609, now seen corresponding path program 83 times [2019-02-28 10:18:16,986 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:18:16,986 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:18:16,986 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:18:16,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:18:16,987 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:18:17,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:18:20,517 INFO L134 CoverageAnalysis]: Checked inductivity of 13861 backedges. 0 proven. 13861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:18:20,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:18:20,518 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:18:20,518 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:18:20,518 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:18:20,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:18:20,518 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 [2019-02-28 10:18:20,526 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:18:20,526 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:18:21,023 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 84 check-sat command(s) [2019-02-28 10:18:21,024 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:18:21,030 INFO L256 TraceCheckSpWp]: Trace formula consists of 604 conjuncts, 259 conjunts are in the unsatisfiable core [2019-02-28 10:18:21,033 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:18:21,036 INFO L442 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 [2019-02-28 10:18:21,036 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:18:21,044 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:18:21,044 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:18:24,885 INFO L134 CoverageAnalysis]: Checked inductivity of 13861 backedges. 0 proven. 13861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:18:24,885 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:18:29,317 INFO L134 CoverageAnalysis]: Checked inductivity of 13861 backedges. 0 proven. 13861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:18:29,337 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:18:29,337 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 184 [2019-02-28 10:18:29,337 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:18:29,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 170 states [2019-02-28 10:18:29,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 170 interpolants. [2019-02-28 10:18:29,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13719, Invalid=20691, Unknown=0, NotChecked=0, Total=34410 [2019-02-28 10:18:29,340 INFO L87 Difference]: Start difference. First operand 337 states and 337 transitions. Second operand 170 states. [2019-02-28 10:18:30,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:18:30,117 INFO L93 Difference]: Finished difference Result 343 states and 343 transitions. [2019-02-28 10:18:30,118 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2019-02-28 10:18:30,118 INFO L78 Accepts]: Start accepts. Automaton has 170 states. Word has length 336 [2019-02-28 10:18:30,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:18:30,119 INFO L225 Difference]: With dead ends: 343 [2019-02-28 10:18:30,119 INFO L226 Difference]: Without dead ends: 342 [2019-02-28 10:18:30,120 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 754 GetRequests, 502 SyntacticMatches, 68 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26798 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=13719, Invalid=20691, Unknown=0, NotChecked=0, Total=34410 [2019-02-28 10:18:30,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2019-02-28 10:18:30,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 341. [2019-02-28 10:18:30,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2019-02-28 10:18:30,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 341 transitions. [2019-02-28 10:18:30,127 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 341 transitions. Word has length 336 [2019-02-28 10:18:30,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:18:30,127 INFO L480 AbstractCegarLoop]: Abstraction has 341 states and 341 transitions. [2019-02-28 10:18:30,127 INFO L481 AbstractCegarLoop]: Interpolant automaton has 170 states. [2019-02-28 10:18:30,127 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 341 transitions. [2019-02-28 10:18:30,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2019-02-28 10:18:30,129 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:18:30,129 INFO L402 BasicCegarLoop]: trace histogram [85, 85, 84, 84, 1, 1] [2019-02-28 10:18:30,129 INFO L423 AbstractCegarLoop]: === Iteration 85 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:18:30,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:18:30,129 INFO L82 PathProgramCache]: Analyzing trace with hash -434751718, now seen corresponding path program 84 times [2019-02-28 10:18:30,129 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:18:30,130 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:18:30,130 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:18:30,130 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:18:30,130 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:18:30,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:18:33,606 INFO L134 CoverageAnalysis]: Checked inductivity of 14196 backedges. 0 proven. 14196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:18:33,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:18:33,607 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:18:33,607 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:18:33,607 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:18:33,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:18:33,607 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 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 [2019-02-28 10:18:33,616 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:18:33,616 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:18:33,720 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:18:33,720 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:18:33,726 INFO L256 TraceCheckSpWp]: Trace formula consists of 611 conjuncts, 262 conjunts are in the unsatisfiable core [2019-02-28 10:18:33,729 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:18:33,731 INFO L442 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 [2019-02-28 10:18:33,732 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:18:33,739 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:18:33,739 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:18:37,973 INFO L134 CoverageAnalysis]: Checked inductivity of 14196 backedges. 0 proven. 14196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:18:37,973 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:18:42,252 INFO L134 CoverageAnalysis]: Checked inductivity of 14196 backedges. 0 proven. 14196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:18:42,271 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:18:42,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 185 [2019-02-28 10:18:42,271 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:18:42,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 172 states [2019-02-28 10:18:42,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2019-02-28 10:18:42,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13821, Invalid=20961, Unknown=0, NotChecked=0, Total=34782 [2019-02-28 10:18:42,275 INFO L87 Difference]: Start difference. First operand 341 states and 341 transitions. Second operand 172 states. [2019-02-28 10:18:43,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:18:43,055 INFO L93 Difference]: Finished difference Result 347 states and 347 transitions. [2019-02-28 10:18:43,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2019-02-28 10:18:43,055 INFO L78 Accepts]: Start accepts. Automaton has 172 states. Word has length 340 [2019-02-28 10:18:43,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:18:43,057 INFO L225 Difference]: With dead ends: 347 [2019-02-28 10:18:43,057 INFO L226 Difference]: Without dead ends: 346 [2019-02-28 10:18:43,058 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 763 GetRequests, 508 SyntacticMatches, 70 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27295 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=13821, Invalid=20961, Unknown=0, NotChecked=0, Total=34782 [2019-02-28 10:18:43,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2019-02-28 10:18:43,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 345. [2019-02-28 10:18:43,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 345 states. [2019-02-28 10:18:43,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 345 transitions. [2019-02-28 10:18:43,064 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 345 transitions. Word has length 340 [2019-02-28 10:18:43,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:18:43,064 INFO L480 AbstractCegarLoop]: Abstraction has 345 states and 345 transitions. [2019-02-28 10:18:43,064 INFO L481 AbstractCegarLoop]: Interpolant automaton has 172 states. [2019-02-28 10:18:43,064 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 345 transitions. [2019-02-28 10:18:43,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2019-02-28 10:18:43,065 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:18:43,066 INFO L402 BasicCegarLoop]: trace histogram [86, 86, 85, 85, 1, 1] [2019-02-28 10:18:43,066 INFO L423 AbstractCegarLoop]: === Iteration 86 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:18:43,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:18:43,066 INFO L82 PathProgramCache]: Analyzing trace with hash -207279533, now seen corresponding path program 85 times [2019-02-28 10:18:43,066 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:18:43,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:18:43,067 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:18:43,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:18:43,067 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:18:43,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:18:46,628 INFO L134 CoverageAnalysis]: Checked inductivity of 14535 backedges. 0 proven. 14535 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:18:46,628 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:18:46,628 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:18:46,629 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:18:46,629 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:18:46,629 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:18:46,629 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 [2019-02-28 10:18:46,639 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:18:46,639 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:18:46,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:18:46,731 INFO L256 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 265 conjunts are in the unsatisfiable core [2019-02-28 10:18:46,734 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:18:46,745 INFO L442 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 [2019-02-28 10:18:46,745 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:18:46,758 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:18:46,758 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:18:50,865 INFO L134 CoverageAnalysis]: Checked inductivity of 14535 backedges. 0 proven. 14535 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:18:50,866 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:18:55,019 INFO L134 CoverageAnalysis]: Checked inductivity of 14535 backedges. 0 proven. 14535 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:18:55,038 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:18:55,038 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86, 86] total 186 [2019-02-28 10:18:55,038 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:18:55,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 174 states [2019-02-28 10:18:55,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 174 interpolants. [2019-02-28 10:18:55,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13923, Invalid=21233, Unknown=0, NotChecked=0, Total=35156 [2019-02-28 10:18:55,042 INFO L87 Difference]: Start difference. First operand 345 states and 345 transitions. Second operand 174 states. [2019-02-28 10:18:55,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:18:55,821 INFO L93 Difference]: Finished difference Result 351 states and 351 transitions. [2019-02-28 10:18:55,821 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2019-02-28 10:18:55,821 INFO L78 Accepts]: Start accepts. Automaton has 174 states. Word has length 344 [2019-02-28 10:18:55,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:18:55,823 INFO L225 Difference]: With dead ends: 351 [2019-02-28 10:18:55,823 INFO L226 Difference]: Without dead ends: 350 [2019-02-28 10:18:55,824 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 772 GetRequests, 514 SyntacticMatches, 72 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27792 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=13923, Invalid=21233, Unknown=0, NotChecked=0, Total=35156 [2019-02-28 10:18:55,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2019-02-28 10:18:55,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 349. [2019-02-28 10:18:55,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 349 states. [2019-02-28 10:18:55,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 349 transitions. [2019-02-28 10:18:55,830 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 349 transitions. Word has length 344 [2019-02-28 10:18:55,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:18:55,831 INFO L480 AbstractCegarLoop]: Abstraction has 349 states and 349 transitions. [2019-02-28 10:18:55,831 INFO L481 AbstractCegarLoop]: Interpolant automaton has 174 states. [2019-02-28 10:18:55,831 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 349 transitions. [2019-02-28 10:18:55,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2019-02-28 10:18:55,832 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:18:55,833 INFO L402 BasicCegarLoop]: trace histogram [87, 87, 86, 86, 1, 1] [2019-02-28 10:18:55,833 INFO L423 AbstractCegarLoop]: === Iteration 87 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:18:55,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:18:55,833 INFO L82 PathProgramCache]: Analyzing trace with hash -307898100, now seen corresponding path program 86 times [2019-02-28 10:18:55,833 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:18:55,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:18:55,834 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:18:55,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:18:55,834 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:18:55,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:18:59,402 INFO L134 CoverageAnalysis]: Checked inductivity of 14878 backedges. 0 proven. 14878 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:18:59,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:18:59,403 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:18:59,403 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:18:59,403 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:18:59,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:18:59,403 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 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 [2019-02-28 10:18:59,412 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:18:59,413 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:18:59,960 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 87 check-sat command(s) [2019-02-28 10:18:59,960 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:18:59,966 INFO L256 TraceCheckSpWp]: Trace formula consists of 625 conjuncts, 268 conjunts are in the unsatisfiable core [2019-02-28 10:18:59,970 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:18:59,975 INFO L442 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 [2019-02-28 10:18:59,975 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:18:59,982 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:18:59,982 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:19:04,424 INFO L134 CoverageAnalysis]: Checked inductivity of 14878 backedges. 0 proven. 14878 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:19:04,424 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:19:08,739 INFO L134 CoverageAnalysis]: Checked inductivity of 14878 backedges. 0 proven. 14878 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:19:08,759 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:19:08,759 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 187 [2019-02-28 10:19:08,759 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:19:08,760 INFO L459 AbstractCegarLoop]: Interpolant automaton has 176 states [2019-02-28 10:19:08,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2019-02-28 10:19:08,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14025, Invalid=21507, Unknown=0, NotChecked=0, Total=35532 [2019-02-28 10:19:08,763 INFO L87 Difference]: Start difference. First operand 349 states and 349 transitions. Second operand 176 states. [2019-02-28 10:19:09,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:19:09,496 INFO L93 Difference]: Finished difference Result 355 states and 355 transitions. [2019-02-28 10:19:09,496 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2019-02-28 10:19:09,497 INFO L78 Accepts]: Start accepts. Automaton has 176 states. Word has length 348 [2019-02-28 10:19:09,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:19:09,499 INFO L225 Difference]: With dead ends: 355 [2019-02-28 10:19:09,499 INFO L226 Difference]: Without dead ends: 354 [2019-02-28 10:19:09,500 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 781 GetRequests, 520 SyntacticMatches, 74 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28289 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=14025, Invalid=21507, Unknown=0, NotChecked=0, Total=35532 [2019-02-28 10:19:09,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2019-02-28 10:19:09,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 353. [2019-02-28 10:19:09,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 353 states. [2019-02-28 10:19:09,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 353 transitions. [2019-02-28 10:19:09,506 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 353 transitions. Word has length 348 [2019-02-28 10:19:09,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:19:09,506 INFO L480 AbstractCegarLoop]: Abstraction has 353 states and 353 transitions. [2019-02-28 10:19:09,506 INFO L481 AbstractCegarLoop]: Interpolant automaton has 176 states. [2019-02-28 10:19:09,506 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 353 transitions. [2019-02-28 10:19:09,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 353 [2019-02-28 10:19:09,507 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:19:09,507 INFO L402 BasicCegarLoop]: trace histogram [88, 88, 87, 87, 1, 1] [2019-02-28 10:19:09,507 INFO L423 AbstractCegarLoop]: === Iteration 88 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:19:09,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:19:09,508 INFO L82 PathProgramCache]: Analyzing trace with hash -2050063547, now seen corresponding path program 87 times [2019-02-28 10:19:09,508 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:19:09,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:19:09,508 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:19:09,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:19:09,508 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:19:09,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:19:13,234 INFO L134 CoverageAnalysis]: Checked inductivity of 15225 backedges. 0 proven. 15225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:19:13,234 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:19:13,234 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:19:13,234 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:19:13,234 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:19:13,234 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:19:13,234 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 [2019-02-28 10:19:13,245 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:19:13,245 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:19:13,356 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:19:13,356 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:19:13,362 INFO L256 TraceCheckSpWp]: Trace formula consists of 632 conjuncts, 271 conjunts are in the unsatisfiable core [2019-02-28 10:19:13,366 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:19:13,368 INFO L442 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 [2019-02-28 10:19:13,368 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:19:13,378 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:19:13,378 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:19:17,831 INFO L134 CoverageAnalysis]: Checked inductivity of 15225 backedges. 0 proven. 15225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:19:17,832 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:19:22,246 INFO L134 CoverageAnalysis]: Checked inductivity of 15225 backedges. 0 proven. 15225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:19:22,266 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:19:22,266 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88, 88] total 188 [2019-02-28 10:19:22,266 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:19:22,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 178 states [2019-02-28 10:19:22,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 178 interpolants. [2019-02-28 10:19:22,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14127, Invalid=21783, Unknown=0, NotChecked=0, Total=35910 [2019-02-28 10:19:22,269 INFO L87 Difference]: Start difference. First operand 353 states and 353 transitions. Second operand 178 states. [2019-02-28 10:19:22,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:19:22,987 INFO L93 Difference]: Finished difference Result 359 states and 359 transitions. [2019-02-28 10:19:22,987 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2019-02-28 10:19:22,987 INFO L78 Accepts]: Start accepts. Automaton has 178 states. Word has length 352 [2019-02-28 10:19:22,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:19:22,988 INFO L225 Difference]: With dead ends: 359 [2019-02-28 10:19:22,988 INFO L226 Difference]: Without dead ends: 358 [2019-02-28 10:19:22,989 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 790 GetRequests, 526 SyntacticMatches, 76 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28786 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=14127, Invalid=21783, Unknown=0, NotChecked=0, Total=35910 [2019-02-28 10:19:22,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2019-02-28 10:19:22,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 357. [2019-02-28 10:19:22,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 357 states. [2019-02-28 10:19:22,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 357 transitions. [2019-02-28 10:19:22,995 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 357 transitions. Word has length 352 [2019-02-28 10:19:22,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:19:22,995 INFO L480 AbstractCegarLoop]: Abstraction has 357 states and 357 transitions. [2019-02-28 10:19:22,995 INFO L481 AbstractCegarLoop]: Interpolant automaton has 178 states. [2019-02-28 10:19:22,995 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 357 transitions. [2019-02-28 10:19:22,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 357 [2019-02-28 10:19:22,996 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:19:22,997 INFO L402 BasicCegarLoop]: trace histogram [89, 89, 88, 88, 1, 1] [2019-02-28 10:19:22,997 INFO L423 AbstractCegarLoop]: === Iteration 89 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:19:22,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:19:22,997 INFO L82 PathProgramCache]: Analyzing trace with hash 682977534, now seen corresponding path program 88 times [2019-02-28 10:19:22,997 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:19:22,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:19:22,998 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:19:22,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:19:22,998 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:19:23,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:19:26,552 INFO L134 CoverageAnalysis]: Checked inductivity of 15576 backedges. 0 proven. 15576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:19:26,552 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:19:26,552 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:19:26,553 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:19:26,553 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:19:26,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:19:26,553 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 [2019-02-28 10:19:26,560 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:19:26,560 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:19:26,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:19:26,659 INFO L256 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 274 conjunts are in the unsatisfiable core [2019-02-28 10:19:26,662 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:19:26,664 INFO L442 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 [2019-02-28 10:19:26,664 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:19:26,672 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:19:26,673 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:19:31,176 INFO L134 CoverageAnalysis]: Checked inductivity of 15576 backedges. 0 proven. 15576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:19:31,177 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:19:35,592 INFO L134 CoverageAnalysis]: Checked inductivity of 15576 backedges. 0 proven. 15576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:19:35,610 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:19:35,611 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 189 [2019-02-28 10:19:35,611 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:19:35,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 180 states [2019-02-28 10:19:35,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 180 interpolants. [2019-02-28 10:19:35,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14229, Invalid=22061, Unknown=0, NotChecked=0, Total=36290 [2019-02-28 10:19:35,614 INFO L87 Difference]: Start difference. First operand 357 states and 357 transitions. Second operand 180 states. [2019-02-28 10:19:36,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:19:36,452 INFO L93 Difference]: Finished difference Result 363 states and 363 transitions. [2019-02-28 10:19:36,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2019-02-28 10:19:36,452 INFO L78 Accepts]: Start accepts. Automaton has 180 states. Word has length 356 [2019-02-28 10:19:36,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:19:36,454 INFO L225 Difference]: With dead ends: 363 [2019-02-28 10:19:36,454 INFO L226 Difference]: Without dead ends: 362 [2019-02-28 10:19:36,456 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 799 GetRequests, 532 SyntacticMatches, 78 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29283 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=14229, Invalid=22061, Unknown=0, NotChecked=0, Total=36290 [2019-02-28 10:19:36,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2019-02-28 10:19:36,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 361. [2019-02-28 10:19:36,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 361 states. [2019-02-28 10:19:36,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 361 states to 361 states and 361 transitions. [2019-02-28 10:19:36,461 INFO L78 Accepts]: Start accepts. Automaton has 361 states and 361 transitions. Word has length 356 [2019-02-28 10:19:36,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:19:36,461 INFO L480 AbstractCegarLoop]: Abstraction has 361 states and 361 transitions. [2019-02-28 10:19:36,461 INFO L481 AbstractCegarLoop]: Interpolant automaton has 180 states. [2019-02-28 10:19:36,461 INFO L276 IsEmpty]: Start isEmpty. Operand 361 states and 361 transitions. [2019-02-28 10:19:36,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 361 [2019-02-28 10:19:36,462 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:19:36,463 INFO L402 BasicCegarLoop]: trace histogram [90, 90, 89, 89, 1, 1] [2019-02-28 10:19:36,463 INFO L423 AbstractCegarLoop]: === Iteration 90 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:19:36,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:19:36,463 INFO L82 PathProgramCache]: Analyzing trace with hash -1915696585, now seen corresponding path program 89 times [2019-02-28 10:19:36,463 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:19:36,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:19:36,464 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:19:36,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:19:36,464 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:19:36,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:19:40,546 INFO L134 CoverageAnalysis]: Checked inductivity of 15931 backedges. 0 proven. 15931 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:19:40,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:19:40,546 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:19:40,546 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:19:40,546 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:19:40,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:19:40,546 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 [2019-02-28 10:19:40,557 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:19:40,558 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:19:41,122 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 90 check-sat command(s) [2019-02-28 10:19:41,122 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:19:41,128 INFO L256 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 277 conjunts are in the unsatisfiable core [2019-02-28 10:19:41,131 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:19:41,141 INFO L442 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 [2019-02-28 10:19:41,141 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:19:41,153 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:19:41,153 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:19:45,646 INFO L134 CoverageAnalysis]: Checked inductivity of 15931 backedges. 0 proven. 15931 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:19:45,647 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:19:50,100 INFO L134 CoverageAnalysis]: Checked inductivity of 15931 backedges. 0 proven. 15931 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:19:50,121 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:19:50,121 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90, 90] total 190 [2019-02-28 10:19:50,121 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:19:50,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 182 states [2019-02-28 10:19:50,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 182 interpolants. [2019-02-28 10:19:50,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14331, Invalid=22341, Unknown=0, NotChecked=0, Total=36672 [2019-02-28 10:19:50,124 INFO L87 Difference]: Start difference. First operand 361 states and 361 transitions. Second operand 182 states. [2019-02-28 10:19:50,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:19:50,890 INFO L93 Difference]: Finished difference Result 367 states and 367 transitions. [2019-02-28 10:19:50,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2019-02-28 10:19:50,890 INFO L78 Accepts]: Start accepts. Automaton has 182 states. Word has length 360 [2019-02-28 10:19:50,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:19:50,892 INFO L225 Difference]: With dead ends: 367 [2019-02-28 10:19:50,893 INFO L226 Difference]: Without dead ends: 366 [2019-02-28 10:19:50,894 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 808 GetRequests, 538 SyntacticMatches, 80 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29780 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=14331, Invalid=22341, Unknown=0, NotChecked=0, Total=36672 [2019-02-28 10:19:50,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2019-02-28 10:19:50,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 365. [2019-02-28 10:19:50,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 365 states. [2019-02-28 10:19:50,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 365 transitions. [2019-02-28 10:19:50,900 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 365 transitions. Word has length 360 [2019-02-28 10:19:50,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:19:50,900 INFO L480 AbstractCegarLoop]: Abstraction has 365 states and 365 transitions. [2019-02-28 10:19:50,900 INFO L481 AbstractCegarLoop]: Interpolant automaton has 182 states. [2019-02-28 10:19:50,900 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 365 transitions. [2019-02-28 10:19:50,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 365 [2019-02-28 10:19:50,901 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:19:50,901 INFO L402 BasicCegarLoop]: trace histogram [91, 91, 90, 90, 1, 1] [2019-02-28 10:19:50,902 INFO L423 AbstractCegarLoop]: === Iteration 91 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:19:50,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:19:50,902 INFO L82 PathProgramCache]: Analyzing trace with hash 1198974704, now seen corresponding path program 90 times [2019-02-28 10:19:50,902 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:19:50,902 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:19:50,902 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:19:50,902 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:19:50,902 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:19:50,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:19:54,887 INFO L134 CoverageAnalysis]: Checked inductivity of 16290 backedges. 0 proven. 16290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:19:54,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:19:54,887 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:19:54,887 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:19:54,887 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:19:54,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:19:54,887 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 [2019-02-28 10:19:54,897 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:19:54,897 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:19:55,013 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:19:55,013 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:19:55,019 INFO L256 TraceCheckSpWp]: Trace formula consists of 653 conjuncts, 280 conjunts are in the unsatisfiable core [2019-02-28 10:19:55,023 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:19:55,025 INFO L442 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 [2019-02-28 10:19:55,025 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:19:55,035 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:19:55,035 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:19:59,923 INFO L134 CoverageAnalysis]: Checked inductivity of 16290 backedges. 0 proven. 16290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:19:59,923 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:20:04,270 INFO L134 CoverageAnalysis]: Checked inductivity of 16290 backedges. 0 proven. 16290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:20:04,289 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:20:04,290 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 191 [2019-02-28 10:20:04,290 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:20:04,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 184 states [2019-02-28 10:20:04,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 184 interpolants. [2019-02-28 10:20:04,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14433, Invalid=22623, Unknown=0, NotChecked=0, Total=37056 [2019-02-28 10:20:04,293 INFO L87 Difference]: Start difference. First operand 365 states and 365 transitions. Second operand 184 states. [2019-02-28 10:20:05,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:20:05,006 INFO L93 Difference]: Finished difference Result 371 states and 371 transitions. [2019-02-28 10:20:05,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2019-02-28 10:20:05,007 INFO L78 Accepts]: Start accepts. Automaton has 184 states. Word has length 364 [2019-02-28 10:20:05,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:20:05,008 INFO L225 Difference]: With dead ends: 371 [2019-02-28 10:20:05,008 INFO L226 Difference]: Without dead ends: 370 [2019-02-28 10:20:05,009 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 817 GetRequests, 544 SyntacticMatches, 82 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30277 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=14433, Invalid=22623, Unknown=0, NotChecked=0, Total=37056 [2019-02-28 10:20:05,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2019-02-28 10:20:05,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 369. [2019-02-28 10:20:05,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 369 states. [2019-02-28 10:20:05,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369 states to 369 states and 369 transitions. [2019-02-28 10:20:05,014 INFO L78 Accepts]: Start accepts. Automaton has 369 states and 369 transitions. Word has length 364 [2019-02-28 10:20:05,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:20:05,014 INFO L480 AbstractCegarLoop]: Abstraction has 369 states and 369 transitions. [2019-02-28 10:20:05,015 INFO L481 AbstractCegarLoop]: Interpolant automaton has 184 states. [2019-02-28 10:20:05,015 INFO L276 IsEmpty]: Start isEmpty. Operand 369 states and 369 transitions. [2019-02-28 10:20:05,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 369 [2019-02-28 10:20:05,016 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:20:05,016 INFO L402 BasicCegarLoop]: trace histogram [92, 92, 91, 91, 1, 1] [2019-02-28 10:20:05,016 INFO L423 AbstractCegarLoop]: === Iteration 92 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:20:05,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:20:05,016 INFO L82 PathProgramCache]: Analyzing trace with hash 1390280489, now seen corresponding path program 91 times [2019-02-28 10:20:05,016 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:20:05,017 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:20:05,017 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:20:05,017 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:20:05,017 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:20:05,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:20:09,071 INFO L134 CoverageAnalysis]: Checked inductivity of 16653 backedges. 0 proven. 16653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:20:09,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:20:09,072 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:20:09,072 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:20:09,072 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:20:09,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:20:09,072 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 [2019-02-28 10:20:09,083 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:20:09,083 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:20:09,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:20:09,186 INFO L256 TraceCheckSpWp]: Trace formula consists of 660 conjuncts, 283 conjunts are in the unsatisfiable core [2019-02-28 10:20:09,189 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:20:09,191 INFO L442 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 [2019-02-28 10:20:09,191 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:20:09,201 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:20:09,201 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:20:13,984 INFO L134 CoverageAnalysis]: Checked inductivity of 16653 backedges. 0 proven. 16653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:20:13,985 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:20:18,434 INFO L134 CoverageAnalysis]: Checked inductivity of 16653 backedges. 0 proven. 16653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:20:18,453 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:20:18,454 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92, 92] total 192 [2019-02-28 10:20:18,454 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:20:18,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 186 states [2019-02-28 10:20:18,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 186 interpolants. [2019-02-28 10:20:18,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14535, Invalid=22907, Unknown=0, NotChecked=0, Total=37442 [2019-02-28 10:20:18,457 INFO L87 Difference]: Start difference. First operand 369 states and 369 transitions. Second operand 186 states. [2019-02-28 10:20:19,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:20:19,199 INFO L93 Difference]: Finished difference Result 375 states and 375 transitions. [2019-02-28 10:20:19,200 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2019-02-28 10:20:19,200 INFO L78 Accepts]: Start accepts. Automaton has 186 states. Word has length 368 [2019-02-28 10:20:19,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:20:19,201 INFO L225 Difference]: With dead ends: 375 [2019-02-28 10:20:19,201 INFO L226 Difference]: Without dead ends: 374 [2019-02-28 10:20:19,202 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 826 GetRequests, 550 SyntacticMatches, 84 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30774 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=14535, Invalid=22907, Unknown=0, NotChecked=0, Total=37442 [2019-02-28 10:20:19,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2019-02-28 10:20:19,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 373. [2019-02-28 10:20:19,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 373 states. [2019-02-28 10:20:19,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373 states to 373 states and 373 transitions. [2019-02-28 10:20:19,208 INFO L78 Accepts]: Start accepts. Automaton has 373 states and 373 transitions. Word has length 368 [2019-02-28 10:20:19,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:20:19,208 INFO L480 AbstractCegarLoop]: Abstraction has 373 states and 373 transitions. [2019-02-28 10:20:19,208 INFO L481 AbstractCegarLoop]: Interpolant automaton has 186 states. [2019-02-28 10:20:19,208 INFO L276 IsEmpty]: Start isEmpty. Operand 373 states and 373 transitions. [2019-02-28 10:20:19,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 373 [2019-02-28 10:20:19,209 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:20:19,209 INFO L402 BasicCegarLoop]: trace histogram [93, 93, 92, 92, 1, 1] [2019-02-28 10:20:19,209 INFO L423 AbstractCegarLoop]: === Iteration 93 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:20:19,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:20:19,210 INFO L82 PathProgramCache]: Analyzing trace with hash -1474538782, now seen corresponding path program 92 times [2019-02-28 10:20:19,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:20:19,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:20:19,211 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:20:19,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:20:19,211 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:20:19,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:20:23,198 INFO L134 CoverageAnalysis]: Checked inductivity of 17020 backedges. 0 proven. 17020 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:20:23,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:20:23,199 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:20:23,199 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:20:23,199 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:20:23,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:20:23,199 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 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 [2019-02-28 10:20:23,207 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:20:23,207 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:20:23,830 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 93 check-sat command(s) [2019-02-28 10:20:23,831 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:20:23,843 INFO L256 TraceCheckSpWp]: Trace formula consists of 667 conjuncts, 286 conjunts are in the unsatisfiable core [2019-02-28 10:20:23,846 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:20:23,849 INFO L442 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 [2019-02-28 10:20:23,849 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:20:23,857 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:20:23,858 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:20:28,879 INFO L134 CoverageAnalysis]: Checked inductivity of 17020 backedges. 0 proven. 17020 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:20:28,879 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:20:33,128 INFO L134 CoverageAnalysis]: Checked inductivity of 17020 backedges. 0 proven. 17020 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:20:33,147 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:20:33,147 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 193 [2019-02-28 10:20:33,147 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:20:33,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 188 states [2019-02-28 10:20:33,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2019-02-28 10:20:33,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14637, Invalid=23193, Unknown=0, NotChecked=0, Total=37830 [2019-02-28 10:20:33,150 INFO L87 Difference]: Start difference. First operand 373 states and 373 transitions. Second operand 188 states. [2019-02-28 10:20:33,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:20:33,905 INFO L93 Difference]: Finished difference Result 379 states and 379 transitions. [2019-02-28 10:20:33,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2019-02-28 10:20:33,905 INFO L78 Accepts]: Start accepts. Automaton has 188 states. Word has length 372 [2019-02-28 10:20:33,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:20:33,907 INFO L225 Difference]: With dead ends: 379 [2019-02-28 10:20:33,907 INFO L226 Difference]: Without dead ends: 378 [2019-02-28 10:20:33,908 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 835 GetRequests, 556 SyntacticMatches, 86 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31271 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=14637, Invalid=23193, Unknown=0, NotChecked=0, Total=37830 [2019-02-28 10:20:33,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2019-02-28 10:20:33,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 377. [2019-02-28 10:20:33,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 377 states. [2019-02-28 10:20:33,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 377 transitions. [2019-02-28 10:20:33,914 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 377 transitions. Word has length 372 [2019-02-28 10:20:33,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:20:33,914 INFO L480 AbstractCegarLoop]: Abstraction has 377 states and 377 transitions. [2019-02-28 10:20:33,914 INFO L481 AbstractCegarLoop]: Interpolant automaton has 188 states. [2019-02-28 10:20:33,914 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 377 transitions. [2019-02-28 10:20:33,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 377 [2019-02-28 10:20:33,915 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:20:33,915 INFO L402 BasicCegarLoop]: trace histogram [94, 94, 93, 93, 1, 1] [2019-02-28 10:20:33,916 INFO L423 AbstractCegarLoop]: === Iteration 94 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:20:33,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:20:33,916 INFO L82 PathProgramCache]: Analyzing trace with hash -903339493, now seen corresponding path program 93 times [2019-02-28 10:20:33,916 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:20:33,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:20:33,916 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:20:33,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:20:33,917 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:20:33,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:20:37,982 INFO L134 CoverageAnalysis]: Checked inductivity of 17391 backedges. 0 proven. 17391 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:20:37,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:20:37,983 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:20:37,983 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:20:37,983 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:20:37,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:20:37,983 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 [2019-02-28 10:20:37,992 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:20:37,992 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:20:38,105 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:20:38,105 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:20:38,112 INFO L256 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 289 conjunts are in the unsatisfiable core [2019-02-28 10:20:38,116 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:20:38,117 INFO L442 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 [2019-02-28 10:20:38,118 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:20:38,129 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:20:38,129 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:20:43,118 INFO L134 CoverageAnalysis]: Checked inductivity of 17391 backedges. 0 proven. 17391 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:20:43,118 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:20:47,649 INFO L134 CoverageAnalysis]: Checked inductivity of 17391 backedges. 0 proven. 17391 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:20:47,668 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:20:47,668 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94, 94] total 194 [2019-02-28 10:20:47,668 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:20:47,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 190 states [2019-02-28 10:20:47,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2019-02-28 10:20:47,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14739, Invalid=23481, Unknown=0, NotChecked=0, Total=38220 [2019-02-28 10:20:47,672 INFO L87 Difference]: Start difference. First operand 377 states and 377 transitions. Second operand 190 states. [2019-02-28 10:20:48,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:20:48,375 INFO L93 Difference]: Finished difference Result 383 states and 383 transitions. [2019-02-28 10:20:48,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2019-02-28 10:20:48,376 INFO L78 Accepts]: Start accepts. Automaton has 190 states. Word has length 376 [2019-02-28 10:20:48,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:20:48,378 INFO L225 Difference]: With dead ends: 383 [2019-02-28 10:20:48,378 INFO L226 Difference]: Without dead ends: 382 [2019-02-28 10:20:48,379 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 844 GetRequests, 562 SyntacticMatches, 88 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31768 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=14739, Invalid=23481, Unknown=0, NotChecked=0, Total=38220 [2019-02-28 10:20:48,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382 states. [2019-02-28 10:20:48,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382 to 381. [2019-02-28 10:20:48,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 381 states. [2019-02-28 10:20:48,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 381 states to 381 states and 381 transitions. [2019-02-28 10:20:48,384 INFO L78 Accepts]: Start accepts. Automaton has 381 states and 381 transitions. Word has length 376 [2019-02-28 10:20:48,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:20:48,384 INFO L480 AbstractCegarLoop]: Abstraction has 381 states and 381 transitions. [2019-02-28 10:20:48,384 INFO L481 AbstractCegarLoop]: Interpolant automaton has 190 states. [2019-02-28 10:20:48,384 INFO L276 IsEmpty]: Start isEmpty. Operand 381 states and 381 transitions. [2019-02-28 10:20:48,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 381 [2019-02-28 10:20:48,386 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:20:48,386 INFO L402 BasicCegarLoop]: trace histogram [95, 95, 94, 94, 1, 1] [2019-02-28 10:20:48,386 INFO L423 AbstractCegarLoop]: === Iteration 95 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:20:48,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:20:48,386 INFO L82 PathProgramCache]: Analyzing trace with hash 1456975060, now seen corresponding path program 94 times [2019-02-28 10:20:48,386 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:20:48,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:20:48,387 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:20:48,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:20:48,387 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:20:48,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:20:52,636 INFO L134 CoverageAnalysis]: Checked inductivity of 17766 backedges. 0 proven. 17766 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:20:52,636 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:20:52,636 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:20:52,636 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:20:52,636 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:20:52,636 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:20:52,636 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 [2019-02-28 10:20:52,645 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:20:52,645 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:20:52,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:20:52,751 INFO L256 TraceCheckSpWp]: Trace formula consists of 681 conjuncts, 292 conjunts are in the unsatisfiable core [2019-02-28 10:20:52,755 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:20:52,757 INFO L442 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 [2019-02-28 10:20:52,757 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:20:52,767 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:20:52,767 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:20:57,854 INFO L134 CoverageAnalysis]: Checked inductivity of 17766 backedges. 0 proven. 17766 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:20:57,854 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:21:02,468 INFO L134 CoverageAnalysis]: Checked inductivity of 17766 backedges. 0 proven. 17766 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:21:02,486 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:21:02,487 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 195 [2019-02-28 10:21:02,487 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:21:02,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 192 states [2019-02-28 10:21:02,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2019-02-28 10:21:02,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14841, Invalid=23771, Unknown=0, NotChecked=0, Total=38612 [2019-02-28 10:21:02,490 INFO L87 Difference]: Start difference. First operand 381 states and 381 transitions. Second operand 192 states. [2019-02-28 10:21:03,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:21:03,304 INFO L93 Difference]: Finished difference Result 387 states and 387 transitions. [2019-02-28 10:21:03,305 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2019-02-28 10:21:03,305 INFO L78 Accepts]: Start accepts. Automaton has 192 states. Word has length 380 [2019-02-28 10:21:03,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:21:03,307 INFO L225 Difference]: With dead ends: 387 [2019-02-28 10:21:03,307 INFO L226 Difference]: Without dead ends: 386 [2019-02-28 10:21:03,309 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 853 GetRequests, 568 SyntacticMatches, 90 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32265 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=14841, Invalid=23771, Unknown=0, NotChecked=0, Total=38612 [2019-02-28 10:21:03,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2019-02-28 10:21:03,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 385. [2019-02-28 10:21:03,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 385 states. [2019-02-28 10:21:03,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 385 transitions. [2019-02-28 10:21:03,314 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 385 transitions. Word has length 380 [2019-02-28 10:21:03,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:21:03,314 INFO L480 AbstractCegarLoop]: Abstraction has 385 states and 385 transitions. [2019-02-28 10:21:03,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has 192 states. [2019-02-28 10:21:03,314 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 385 transitions. [2019-02-28 10:21:03,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 385 [2019-02-28 10:21:03,316 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:21:03,316 INFO L402 BasicCegarLoop]: trace histogram [96, 96, 95, 95, 1, 1] [2019-02-28 10:21:03,316 INFO L423 AbstractCegarLoop]: === Iteration 96 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:21:03,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:21:03,316 INFO L82 PathProgramCache]: Analyzing trace with hash -1763626227, now seen corresponding path program 95 times [2019-02-28 10:21:03,316 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:21:03,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:21:03,317 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:21:03,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:21:03,317 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:21:03,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:21:07,844 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:21:07,844 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:21:07,845 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:21:07,845 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:21:07,845 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:21:07,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:21:07,845 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 [2019-02-28 10:21:07,854 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:21:07,854 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:21:08,505 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 96 check-sat command(s) [2019-02-28 10:21:08,505 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:21:08,513 INFO L256 TraceCheckSpWp]: Trace formula consists of 688 conjuncts, 295 conjunts are in the unsatisfiable core [2019-02-28 10:21:08,517 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:21:08,523 INFO L442 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 [2019-02-28 10:21:08,523 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:21:08,532 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:21:08,532 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:21:13,668 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:21:13,668 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:21:18,245 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:21:18,265 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:21:18,266 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 196 [2019-02-28 10:21:18,266 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:21:18,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 194 states [2019-02-28 10:21:18,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2019-02-28 10:21:18,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14943, Invalid=24063, Unknown=0, NotChecked=0, Total=39006 [2019-02-28 10:21:18,269 INFO L87 Difference]: Start difference. First operand 385 states and 385 transitions. Second operand 194 states. [2019-02-28 10:21:19,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:21:19,123 INFO L93 Difference]: Finished difference Result 391 states and 391 transitions. [2019-02-28 10:21:19,124 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2019-02-28 10:21:19,124 INFO L78 Accepts]: Start accepts. Automaton has 194 states. Word has length 384 [2019-02-28 10:21:19,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:21:19,125 INFO L225 Difference]: With dead ends: 391 [2019-02-28 10:21:19,125 INFO L226 Difference]: Without dead ends: 390 [2019-02-28 10:21:19,126 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 862 GetRequests, 574 SyntacticMatches, 92 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32762 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=14943, Invalid=24063, Unknown=0, NotChecked=0, Total=39006 [2019-02-28 10:21:19,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2019-02-28 10:21:19,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 389. [2019-02-28 10:21:19,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 389 states. [2019-02-28 10:21:19,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 389 states and 389 transitions. [2019-02-28 10:21:19,132 INFO L78 Accepts]: Start accepts. Automaton has 389 states and 389 transitions. Word has length 384 [2019-02-28 10:21:19,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:21:19,132 INFO L480 AbstractCegarLoop]: Abstraction has 389 states and 389 transitions. [2019-02-28 10:21:19,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has 194 states. [2019-02-28 10:21:19,132 INFO L276 IsEmpty]: Start isEmpty. Operand 389 states and 389 transitions. [2019-02-28 10:21:19,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 389 [2019-02-28 10:21:19,134 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:21:19,135 INFO L402 BasicCegarLoop]: trace histogram [97, 97, 96, 96, 1, 1] [2019-02-28 10:21:19,135 INFO L423 AbstractCegarLoop]: === Iteration 97 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:21:19,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:21:19,135 INFO L82 PathProgramCache]: Analyzing trace with hash 232453318, now seen corresponding path program 96 times [2019-02-28 10:21:19,135 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:21:19,136 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:21:19,136 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:21:19,136 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:21:19,136 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:21:19,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:21:23,610 INFO L134 CoverageAnalysis]: Checked inductivity of 18528 backedges. 0 proven. 18528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:21:23,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:21:23,610 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:21:23,610 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:21:23,610 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:21:23,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:21:23,610 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 [2019-02-28 10:21:23,621 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:21:23,621 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:21:23,738 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:21:23,738 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:21:23,750 INFO L256 TraceCheckSpWp]: Trace formula consists of 695 conjuncts, 298 conjunts are in the unsatisfiable core [2019-02-28 10:21:23,755 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:21:23,763 INFO L442 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 [2019-02-28 10:21:23,763 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:21:23,777 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:21:23,777 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:21:29,126 INFO L134 CoverageAnalysis]: Checked inductivity of 18528 backedges. 0 proven. 18528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:21:29,126 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:21:33,593 INFO L134 CoverageAnalysis]: Checked inductivity of 18528 backedges. 0 proven. 18528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:21:33,613 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:21:33,613 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 197 [2019-02-28 10:21:33,614 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:21:33,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 196 states [2019-02-28 10:21:33,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 196 interpolants. [2019-02-28 10:21:33,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15045, Invalid=24357, Unknown=0, NotChecked=0, Total=39402 [2019-02-28 10:21:33,617 INFO L87 Difference]: Start difference. First operand 389 states and 389 transitions. Second operand 196 states. [2019-02-28 10:21:34,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:21:34,551 INFO L93 Difference]: Finished difference Result 395 states and 395 transitions. [2019-02-28 10:21:34,551 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2019-02-28 10:21:34,551 INFO L78 Accepts]: Start accepts. Automaton has 196 states. Word has length 388 [2019-02-28 10:21:34,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:21:34,553 INFO L225 Difference]: With dead ends: 395 [2019-02-28 10:21:34,553 INFO L226 Difference]: Without dead ends: 394 [2019-02-28 10:21:34,554 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 871 GetRequests, 580 SyntacticMatches, 94 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33259 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=15045, Invalid=24357, Unknown=0, NotChecked=0, Total=39402 [2019-02-28 10:21:34,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2019-02-28 10:21:34,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 393. [2019-02-28 10:21:34,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 393 states. [2019-02-28 10:21:34,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 393 states to 393 states and 393 transitions. [2019-02-28 10:21:34,559 INFO L78 Accepts]: Start accepts. Automaton has 393 states and 393 transitions. Word has length 388 [2019-02-28 10:21:34,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:21:34,560 INFO L480 AbstractCegarLoop]: Abstraction has 393 states and 393 transitions. [2019-02-28 10:21:34,560 INFO L481 AbstractCegarLoop]: Interpolant automaton has 196 states. [2019-02-28 10:21:34,560 INFO L276 IsEmpty]: Start isEmpty. Operand 393 states and 393 transitions. [2019-02-28 10:21:34,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 393 [2019-02-28 10:21:34,561 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:21:34,561 INFO L402 BasicCegarLoop]: trace histogram [98, 98, 97, 97, 1, 1] [2019-02-28 10:21:34,561 INFO L423 AbstractCegarLoop]: === Iteration 98 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:21:34,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:21:34,562 INFO L82 PathProgramCache]: Analyzing trace with hash 171651583, now seen corresponding path program 97 times [2019-02-28 10:21:34,562 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:21:34,562 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:21:34,562 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:21:34,562 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:21:34,562 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:21:34,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:21:38,920 INFO L134 CoverageAnalysis]: Checked inductivity of 18915 backedges. 0 proven. 18915 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:21:38,920 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:21:38,920 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:21:38,920 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:21:38,920 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:21:38,920 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:21:38,920 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 [2019-02-28 10:21:38,929 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:21:38,929 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:21:39,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:21:39,039 INFO L256 TraceCheckSpWp]: Trace formula consists of 702 conjuncts, 301 conjunts are in the unsatisfiable core [2019-02-28 10:21:39,043 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:21:39,045 INFO L442 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 [2019-02-28 10:21:39,045 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:21:39,055 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:21:39,056 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:21:44,518 INFO L134 CoverageAnalysis]: Checked inductivity of 18915 backedges. 0 proven. 18915 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:21:44,518 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:21:48,956 INFO L134 CoverageAnalysis]: Checked inductivity of 18915 backedges. 0 proven. 18915 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:21:48,975 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:21:48,975 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98, 98] total 198 [2019-02-28 10:21:48,975 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:21:48,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 198 states [2019-02-28 10:21:48,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 198 interpolants. [2019-02-28 10:21:48,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15147, Invalid=24653, Unknown=0, NotChecked=0, Total=39800 [2019-02-28 10:21:48,978 INFO L87 Difference]: Start difference. First operand 393 states and 393 transitions. Second operand 198 states. [2019-02-28 10:21:49,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:21:49,763 INFO L93 Difference]: Finished difference Result 399 states and 399 transitions. [2019-02-28 10:21:49,763 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2019-02-28 10:21:49,763 INFO L78 Accepts]: Start accepts. Automaton has 198 states. Word has length 392 [2019-02-28 10:21:49,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:21:49,765 INFO L225 Difference]: With dead ends: 399 [2019-02-28 10:21:49,765 INFO L226 Difference]: Without dead ends: 398 [2019-02-28 10:21:49,766 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 880 GetRequests, 586 SyntacticMatches, 96 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33756 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=15147, Invalid=24653, Unknown=0, NotChecked=0, Total=39800 [2019-02-28 10:21:49,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2019-02-28 10:21:49,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 397. [2019-02-28 10:21:49,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 397 states. [2019-02-28 10:21:49,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 397 transitions. [2019-02-28 10:21:49,772 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 397 transitions. Word has length 392 [2019-02-28 10:21:49,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:21:49,772 INFO L480 AbstractCegarLoop]: Abstraction has 397 states and 397 transitions. [2019-02-28 10:21:49,772 INFO L481 AbstractCegarLoop]: Interpolant automaton has 198 states. [2019-02-28 10:21:49,772 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 397 transitions. [2019-02-28 10:21:49,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 397 [2019-02-28 10:21:49,774 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:21:49,774 INFO L402 BasicCegarLoop]: trace histogram [99, 99, 98, 98, 1, 1] [2019-02-28 10:21:49,774 INFO L423 AbstractCegarLoop]: === Iteration 99 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:21:49,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:21:49,774 INFO L82 PathProgramCache]: Analyzing trace with hash 894970552, now seen corresponding path program 98 times [2019-02-28 10:21:49,774 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:21:49,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:21:49,775 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:21:49,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:21:49,775 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:21:49,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:21:54,457 INFO L134 CoverageAnalysis]: Checked inductivity of 19306 backedges. 0 proven. 19306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:21:54,458 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:21:54,458 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:21:54,458 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:21:54,458 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:21:54,458 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:21:54,458 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 [2019-02-28 10:21:54,467 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-28 10:21:54,467 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-28 10:21:55,165 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 99 check-sat command(s) [2019-02-28 10:21:55,165 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:21:55,173 INFO L256 TraceCheckSpWp]: Trace formula consists of 709 conjuncts, 304 conjunts are in the unsatisfiable core [2019-02-28 10:21:55,176 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:21:55,179 INFO L442 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 [2019-02-28 10:21:55,179 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:21:55,191 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:21:55,191 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:22:00,884 INFO L134 CoverageAnalysis]: Checked inductivity of 19306 backedges. 0 proven. 19306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:22:00,884 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:22:05,163 INFO L134 CoverageAnalysis]: Checked inductivity of 19306 backedges. 0 proven. 19306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:22:05,182 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:22:05,182 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 199 [2019-02-28 10:22:05,182 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:22:05,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 200 states [2019-02-28 10:22:05,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 200 interpolants. [2019-02-28 10:22:05,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15249, Invalid=24951, Unknown=0, NotChecked=0, Total=40200 [2019-02-28 10:22:05,186 INFO L87 Difference]: Start difference. First operand 397 states and 397 transitions. Second operand 200 states. [2019-02-28 10:22:06,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:22:06,104 INFO L93 Difference]: Finished difference Result 403 states and 403 transitions. [2019-02-28 10:22:06,104 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2019-02-28 10:22:06,105 INFO L78 Accepts]: Start accepts. Automaton has 200 states. Word has length 396 [2019-02-28 10:22:06,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:22:06,107 INFO L225 Difference]: With dead ends: 403 [2019-02-28 10:22:06,107 INFO L226 Difference]: Without dead ends: 402 [2019-02-28 10:22:06,108 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 889 GetRequests, 592 SyntacticMatches, 98 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34253 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=15249, Invalid=24951, Unknown=0, NotChecked=0, Total=40200 [2019-02-28 10:22:06,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2019-02-28 10:22:06,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 401. [2019-02-28 10:22:06,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 401 states. [2019-02-28 10:22:06,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 401 states to 401 states and 401 transitions. [2019-02-28 10:22:06,113 INFO L78 Accepts]: Start accepts. Automaton has 401 states and 401 transitions. Word has length 396 [2019-02-28 10:22:06,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:22:06,114 INFO L480 AbstractCegarLoop]: Abstraction has 401 states and 401 transitions. [2019-02-28 10:22:06,114 INFO L481 AbstractCegarLoop]: Interpolant automaton has 200 states. [2019-02-28 10:22:06,114 INFO L276 IsEmpty]: Start isEmpty. Operand 401 states and 401 transitions. [2019-02-28 10:22:06,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2019-02-28 10:22:06,116 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:22:06,116 INFO L402 BasicCegarLoop]: trace histogram [100, 100, 99, 99, 1, 1] [2019-02-28 10:22:06,116 INFO L423 AbstractCegarLoop]: === Iteration 100 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:22:06,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:22:06,117 INFO L82 PathProgramCache]: Analyzing trace with hash 594026225, now seen corresponding path program 99 times [2019-02-28 10:22:06,117 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:22:06,117 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:22:06,117 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:22:06,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:22:06,118 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:22:06,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:22:10,842 INFO L134 CoverageAnalysis]: Checked inductivity of 19701 backedges. 0 proven. 19701 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:22:10,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:22:10,842 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:22:10,842 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:22:10,842 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:22:10,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:22:10,842 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 [2019-02-28 10:22:10,850 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-28 10:22:10,850 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-28 10:22:10,998 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-28 10:22:10,998 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-28 10:22:11,008 INFO L256 TraceCheckSpWp]: Trace formula consists of 716 conjuncts, 307 conjunts are in the unsatisfiable core [2019-02-28 10:22:11,013 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:22:11,029 INFO L442 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 [2019-02-28 10:22:11,030 INFO L315 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-28 10:22:11,057 INFO L315 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-28 10:22:11,058 INFO L209 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-28 10:22:16,608 INFO L134 CoverageAnalysis]: Checked inductivity of 19701 backedges. 0 proven. 19701 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:22:16,608 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:22:20,840 INFO L134 CoverageAnalysis]: Checked inductivity of 19701 backedges. 0 proven. 19701 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:22:20,859 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:22:20,859 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100, 100] total 200 [2019-02-28 10:22:20,859 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:22:20,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 202 states [2019-02-28 10:22:20,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 202 interpolants. [2019-02-28 10:22:20,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15351, Invalid=25251, Unknown=0, NotChecked=0, Total=40602 [2019-02-28 10:22:20,862 INFO L87 Difference]: Start difference. First operand 401 states and 401 transitions. Second operand 202 states. [2019-02-28 10:22:21,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:22:21,760 INFO L93 Difference]: Finished difference Result 407 states and 407 transitions. [2019-02-28 10:22:21,760 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2019-02-28 10:22:21,760 INFO L78 Accepts]: Start accepts. Automaton has 202 states. Word has length 400 [2019-02-28 10:22:21,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:22:21,763 INFO L225 Difference]: With dead ends: 407 [2019-02-28 10:22:21,763 INFO L226 Difference]: Without dead ends: 406 [2019-02-28 10:22:21,764 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 898 GetRequests, 599 SyntacticMatches, 99 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34551 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=15351, Invalid=25251, Unknown=0, NotChecked=0, Total=40602 [2019-02-28 10:22:21,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2019-02-28 10:22:21,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 405. [2019-02-28 10:22:21,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 405 states. [2019-02-28 10:22:21,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405 states to 405 states and 405 transitions. [2019-02-28 10:22:21,770 INFO L78 Accepts]: Start accepts. Automaton has 405 states and 405 transitions. Word has length 400 [2019-02-28 10:22:21,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:22:21,770 INFO L480 AbstractCegarLoop]: Abstraction has 405 states and 405 transitions. [2019-02-28 10:22:21,770 INFO L481 AbstractCegarLoop]: Interpolant automaton has 202 states. [2019-02-28 10:22:21,770 INFO L276 IsEmpty]: Start isEmpty. Operand 405 states and 405 transitions. [2019-02-28 10:22:21,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 405 [2019-02-28 10:22:21,772 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:22:21,772 INFO L402 BasicCegarLoop]: trace histogram [101, 101, 100, 100, 1, 1] [2019-02-28 10:22:21,772 INFO L423 AbstractCegarLoop]: === Iteration 101 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:22:21,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:22:21,773 INFO L82 PathProgramCache]: Analyzing trace with hash -478064982, now seen corresponding path program 100 times [2019-02-28 10:22:21,773 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:22:21,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:22:21,774 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-28 10:22:21,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:22:21,774 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:22:21,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:22:26,599 INFO L134 CoverageAnalysis]: Checked inductivity of 20100 backedges. 19603 proven. 497 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:22:26,600 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:22:26,600 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:22:26,600 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-28 10:22:26,600 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-28 10:22:26,600 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:22:26,600 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 [2019-02-28 10:22:26,608 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:22:26,608 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-28 10:22:26,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:22:26,707 INFO L256 TraceCheckSpWp]: Trace formula consists of 723 conjuncts, 103 conjunts are in the unsatisfiable core [2019-02-28 10:22:26,710 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-02-28 10:22:26,905 INFO L134 CoverageAnalysis]: Checked inductivity of 20100 backedges. 20000 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:22:26,905 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-02-28 10:22:31,592 INFO L134 CoverageAnalysis]: Checked inductivity of 20100 backedges. 20000 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:22:31,632 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-28 10:22:31,632 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 103, 103] total 104 [2019-02-28 10:22:31,632 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-28 10:22:31,633 INFO L459 AbstractCegarLoop]: Interpolant automaton has 105 states [2019-02-28 10:22:31,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2019-02-28 10:22:31,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5258, Invalid=5662, Unknown=0, NotChecked=0, Total=10920 [2019-02-28 10:22:31,634 INFO L87 Difference]: Start difference. First operand 405 states and 405 transitions. Second operand 105 states. [2019-02-28 10:22:33,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:22:33,032 INFO L93 Difference]: Finished difference Result 408 states and 408 transitions. [2019-02-28 10:22:33,032 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2019-02-28 10:22:33,032 INFO L78 Accepts]: Start accepts. Automaton has 105 states. Word has length 404 [2019-02-28 10:22:33,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:22:33,033 INFO L225 Difference]: With dead ends: 408 [2019-02-28 10:22:33,034 INFO L226 Difference]: Without dead ends: 0 [2019-02-28 10:22:33,037 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 910 GetRequests, 706 SyntacticMatches, 100 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5643 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=5362, Invalid=5768, Unknown=0, NotChecked=0, Total=11130 [2019-02-28 10:22:33,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-02-28 10:22:33,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-02-28 10:22:33,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-02-28 10:22:33,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-02-28 10:22:33,038 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 404 [2019-02-28 10:22:33,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:22:33,038 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-02-28 10:22:33,038 INFO L481 AbstractCegarLoop]: Interpolant automaton has 105 states. [2019-02-28 10:22:33,038 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-02-28 10:22:33,038 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-02-28 10:22:33,042 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2019-02-28 10:22:33,147 WARN L181 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 511 [2019-02-28 10:22:35,862 WARN L181 SmtUtils]: Spent 2.71 s on a formula simplification. DAG size of input: 511 DAG size of output: 509 [2019-02-28 10:22:35,869 INFO L448 ceAbstractionStarter]: For program point mainENTRY(lines 3 24) no Hoare annotation was computed. [2019-02-28 10:22:35,870 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 3 24) no Hoare annotation was computed. [2019-02-28 10:22:35,870 INFO L448 ceAbstractionStarter]: For program point L17(line 17) no Hoare annotation was computed. [2019-02-28 10:22:35,870 INFO L448 ceAbstractionStarter]: For program point L16(lines 16 20) no Hoare annotation was computed. [2019-02-28 10:22:35,870 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONASSERT(line 17) no Hoare annotation was computed. [2019-02-28 10:22:35,870 INFO L448 ceAbstractionStarter]: For program point L16-1(lines 16 20) no Hoare annotation was computed. [2019-02-28 10:22:35,872 INFO L444 ceAbstractionStarter]: At program point L13-1(lines 13 22) 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_p.offset 276) main_q.offset) (<= main_q.offset 276) .cse0) (and (<= main_q.offset 356) (<= (+ main_p.offset 356) main_q.offset) .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 312) main_q.offset) (<= main_q.offset 312) .cse0) (and (<= (+ main_p.offset 396) main_q.offset) (<= main_q.offset 396) .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 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 156) main_q.offset) (<= main_q.offset 156) .cse0) (and (<= (+ main_p.offset 364) main_q.offset) (<= main_q.offset 364) .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 0) .cse0 (= main_p.offset main_q.offset)) (and (<= (+ main_p.offset 40) main_q.offset) (<= main_q.offset 40) .cse0) (and (<= main_q.offset 256) (<= (+ main_p.offset 256) main_q.offset) .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))) [2019-02-28 10:22:35,872 INFO L448 ceAbstractionStarter]: For program point L13-2(lines 3 24) no Hoare annotation was computed. [2019-02-28 10:22:35,925 INFO L202 PluginConnector]: Adding new model PointerIncrement-simplified02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.02 10:22:35 BoogieIcfgContainer [2019-02-28 10:22:35,926 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-02-28 10:22:35,926 INFO L168 Benchmark]: Toolchain (without parser) took 728423.46 ms. Allocated memory was 141.6 MB in the beginning and 2.4 GB in the end (delta: 2.3 GB). Free memory was 107.9 MB in the beginning and 1.6 GB in the end (delta: -1.5 GB). Peak memory consumption was 732.5 MB. Max. memory is 7.1 GB. [2019-02-28 10:22:35,927 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.18 ms. Allocated memory is still 141.6 MB. Free memory is still 108.7 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-02-28 10:22:35,927 INFO L168 Benchmark]: Boogie Procedure Inliner took 52.27 ms. Allocated memory is still 141.6 MB. Free memory was 107.5 MB in the beginning and 105.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. [2019-02-28 10:22:35,928 INFO L168 Benchmark]: Boogie Preprocessor took 24.19 ms. Allocated memory is still 141.6 MB. Free memory was 105.4 MB in the beginning and 104.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2019-02-28 10:22:35,928 INFO L168 Benchmark]: RCFGBuilder took 317.85 ms. Allocated memory is still 141.6 MB. Free memory was 104.1 MB in the beginning and 94.0 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2019-02-28 10:22:35,928 INFO L168 Benchmark]: TraceAbstraction took 728025.11 ms. Allocated memory was 141.6 MB in the beginning and 2.4 GB in the end (delta: 2.3 GB). Free memory was 93.6 MB in the beginning and 1.6 GB in the end (delta: -1.6 GB). Peak memory consumption was 718.2 MB. Max. memory is 7.1 GB. [2019-02-28 10:22:35,930 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 0.18 ms. Allocated memory is still 141.6 MB. Free memory is still 108.7 MB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 52.27 ms. Allocated memory is still 141.6 MB. Free memory was 107.5 MB in the beginning and 105.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 24.19 ms. Allocated memory is still 141.6 MB. Free memory was 105.4 MB in the beginning and 104.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 317.85 ms. Allocated memory is still 141.6 MB. Free memory was 104.1 MB in the beginning and 94.0 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 728025.11 ms. Allocated memory was 141.6 MB in the beginning and 2.4 GB in the end (delta: 2.3 GB). Free memory was 93.6 MB in the beginning and 1.6 GB in the end (delta: -1.6 GB). Peak memory consumption was 718.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 17]: 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: 13]: 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])) || ((p!offset + 276 <= q!offset && q!offset <= 276) && 400 <= #length[q!base])) || ((q!offset <= 356 && p!offset + 356 <= q!offset) && 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 + 312 <= q!offset && q!offset <= 312) && 400 <= #length[q!base])) || ((p!offset + 396 <= q!offset && q!offset <= 396) && 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 + 284 <= q!offset && q!offset <= 284) && 400 <= #length[q!base])) || ((p!offset + 188 <= q!offset && q!offset <= 188) && 400 <= #length[q!base])) || ((p!offset + 8 <= q!offset && q!offset <= 8) && 400 <= #length[q!base])) || ((q!offset <= 348 && 400 <= #length[q!base]) && p!offset + 348 <= q!offset)) || p!offset + 400 <= q!offset) || ((p!offset + 224 <= q!offset && q!offset <= 224) && 400 <= #length[q!base])) || ((p!offset + 120 <= q!offset && q!offset <= 120) && 400 <= #length[q!base])) || ((q!offset <= 232 && p!offset + 232 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 92 && p!offset + 92 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 236 && p!offset + 236 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 328 <= q!offset && q!offset <= 328) && 400 <= #length[q!base])) || ((q!offset <= 12 && p!offset + 12 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 64 <= q!offset && q!offset <= 64) && 400 <= #length[q!base])) || ((p!offset + 192 <= q!offset && q!offset <= 192) && 400 <= #length[q!base])) || ((p!offset + 104 <= q!offset && q!offset <= 104) && 400 <= #length[q!base])) || ((q!offset <= 280 && p!offset + 280 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 316 <= q!offset && q!offset <= 316) && 400 <= #length[q!base])) || ((q!offset <= 152 && p!offset + 152 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 248 <= q!offset && q!offset <= 248) && 400 <= #length[q!base])) || ((q!offset <= 28 && p!offset + 28 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 68 <= q!offset && q!offset <= 68) && 400 <= #length[q!base])) || ((q!offset <= 4 && 400 <= #length[q!base]) && p!offset + 4 <= q!offset)) || ((p!offset + 204 <= q!offset && q!offset <= 204) && 400 <= #length[q!base])) || ((q!offset <= 380 && p!offset + 380 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 52 && p!offset + 52 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 172 <= q!offset && q!offset <= 172) && 400 <= #length[q!base])) || ((q!offset <= 56 && p!offset + 56 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 60 && p!offset + 60 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 100 && p!offset + 100 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 208 && p!offset + 208 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 220 <= q!offset && q!offset <= 220) && 400 <= #length[q!base])) || ((p!offset + 132 <= q!offset && q!offset <= 132) && 400 <= #length[q!base])) || ((q!offset <= 176 && p!offset + 176 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 116 && p!offset + 116 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 136 <= q!offset && q!offset <= 136) && 400 <= #length[q!base])) || ((q!offset <= 184 && p!offset + 184 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 20 && p!offset + 20 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 216 <= q!offset && q!offset <= 216) && 400 <= #length[q!base])) || ((p!offset + 376 <= q!offset && q!offset <= 376) && 400 <= #length[q!base])) || ((p!offset + 324 <= q!offset && q!offset <= 324) && 400 <= #length[q!base])) || ((p!offset + 72 <= q!offset && q!offset <= 72) && 400 <= #length[q!base])) || ((q!offset <= 76 && p!offset + 76 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 16 && p!offset + 16 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 84 && p!offset + 84 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 156 <= q!offset && q!offset <= 156) && 400 <= #length[q!base])) || ((p!offset + 364 <= q!offset && q!offset <= 364) && 400 <= #length[q!base])) || ((p!offset + 88 <= q!offset && 400 <= #length[q!base]) && q!offset <= 88)) || ((q!offset <= 168 && p!offset + 168 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 48 <= q!offset && q!offset <= 48) && 400 <= #length[q!base])) || ((q!offset <= 252 && p!offset + 252 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 264 <= q!offset && q!offset <= 264) && 400 <= #length[q!base])) || ((p!offset + 388 <= q!offset && q!offset <= 388) && 400 <= #length[q!base])) || ((q!offset <= 0 && 400 <= #length[q!base]) && p!offset == q!offset)) || ((p!offset + 40 <= q!offset && q!offset <= 40) && 400 <= #length[q!base])) || ((q!offset <= 256 && p!offset + 256 <= q!offset) && 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, 8 locations, 1 error locations. SAFE Result, 727.8s OverallTime, 101 OverallIterations, 101 TraceHistogramMax, 44.5s AutomataDifference, 0.0s DeadEndRemovalTime, 2.8s HoareAnnotationTime, HoareTripleCheckerStatistics: 403 SDtfs, 7610 SDslu, 7951 SDs, 0 SdLazy, 28139 SolverSat, 355 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 27.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 46154 GetRequests, 30803 SyntacticMatches, 2649 SemanticMatches, 12702 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1303267 ImplicationChecksByTransitivity, 621.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=405occurred in iteration=100, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s 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, 2.7s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 1.0s SsaConstructionTime, 13.9s SatisfiabilityAnalysisTime, 653.9s InterpolantComputationTime, 41204 NumberOfCodeBlocks, 41204 NumberOfCodeBlocksAsserted, 1884 NumberOfCheckSat, 61503 ConstructedInterpolants, 0 QuantifiedInterpolants, 126003756 SizeOfPredicates, 596 NumberOfNonLiveVariables, 37650 ConjunctsInSsa, 15943 ConjunctsInUnsatCore, 301 InterpolantComputations, 1 PerfectInterpolantSequences, 59603/2045250 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...