java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/eureka_01.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-a9d37a5-m [2019-02-28 10:37:48,485 INFO L170 SettingsManager]: Resetting all preferences to default values... [2019-02-28 10:37:48,487 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2019-02-28 10:37:48,502 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-02-28 10:37:48,503 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-02-28 10:37:48,504 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-02-28 10:37:48,506 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-02-28 10:37:48,509 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2019-02-28 10:37:48,511 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-02-28 10:37:48,512 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-02-28 10:37:48,520 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2019-02-28 10:37:48,551 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-02-28 10:37:48,551 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-02-28 10:37:48,553 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-02-28 10:37:48,553 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-02-28 10:37:48,554 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-02-28 10:37:48,557 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2019-02-28 10:37:48,559 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-02-28 10:37:48,559 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2019-02-28 10:37:48,560 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2019-02-28 10:37:48,565 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf [2019-02-28 10:37:48,586 INFO L110 SettingsManager]: Loading preferences was successful [2019-02-28 10:37:48,586 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2019-02-28 10:37:48,588 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2019-02-28 10:37:48,588 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2019-02-28 10:37:48,588 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-02-28 10:37:48,589 INFO L133 SettingsManager]: * User list type=DISABLED [2019-02-28 10:37:48,589 INFO L133 SettingsManager]: * Inline calls to unimplemented procedures=true [2019-02-28 10:37:48,589 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-02-28 10:37:48,590 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-02-28 10:37:48,590 INFO L133 SettingsManager]: * Underlying domain=OctagonDomain [2019-02-28 10:37:48,590 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2019-02-28 10:37:48,590 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-02-28 10:37:48,591 INFO L133 SettingsManager]: * Interval Domain=false [2019-02-28 10:37:48,591 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-02-28 10:37:48,592 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2019-02-28 10:37:48,592 INFO L133 SettingsManager]: * Use SBE=true [2019-02-28 10:37:48,592 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-02-28 10:37:48,592 INFO L133 SettingsManager]: * sizeof long=4 [2019-02-28 10:37:48,592 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2019-02-28 10:37:48,593 INFO L133 SettingsManager]: * sizeof POINTER=4 [2019-02-28 10:37:48,593 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2019-02-28 10:37:48,593 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-02-28 10:37:48,593 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-02-28 10:37:48,593 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-02-28 10:37:48,595 INFO L133 SettingsManager]: * sizeof long double=12 [2019-02-28 10:37:48,595 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2019-02-28 10:37:48,596 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-02-28 10:37:48,596 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-02-28 10:37:48,596 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-02-28 10:37:48,596 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2019-02-28 10:37:48,596 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:16092 -smt2 -in -t:200000 [2019-02-28 10:37:48,597 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-02-28 10:37:48,597 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-02-28 10:37:48,597 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-02-28 10:37:48,597 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-02-28 10:37:48,597 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-02-28 10:37:48,598 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:16092 -smt2 -in [2019-02-28 10:37:48,598 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-02-28 10:37:48,598 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-02-28 10:37:48,645 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-02-28 10:37:48,657 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-02-28 10:37:48,660 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-02-28 10:37:48,662 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2019-02-28 10:37:48,662 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2019-02-28 10:37:48,663 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/eureka_01.i_3.bpl [2019-02-28 10:37:48,663 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/eureka_01.i_3.bpl' [2019-02-28 10:37:48,720 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-02-28 10:37:48,722 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-02-28 10:37:48,723 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-02-28 10:37:48,723 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-02-28 10:37:48,723 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2019-02-28 10:37:48,740 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "eureka_01.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:48" (1/1) ... [2019-02-28 10:37:48,754 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "eureka_01.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:48" (1/1) ... [2019-02-28 10:37:48,769 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-02-28 10:37:48,770 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-02-28 10:37:48,770 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-02-28 10:37:48,770 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2019-02-28 10:37:48,782 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "eureka_01.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:48" (1/1) ... [2019-02-28 10:37:48,782 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "eureka_01.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:48" (1/1) ... [2019-02-28 10:37:48,786 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "eureka_01.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:48" (1/1) ... [2019-02-28 10:37:48,787 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "eureka_01.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:48" (1/1) ... [2019-02-28 10:37:48,793 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "eureka_01.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:48" (1/1) ... [2019-02-28 10:37:48,795 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "eureka_01.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:48" (1/1) ... [2019-02-28 10:37:48,797 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "eureka_01.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:48" (1/1) ... [2019-02-28 10:37:48,800 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-02-28 10:37:48,800 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-02-28 10:37:48,800 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-02-28 10:37:48,801 INFO L276 PluginConnector]: RCFGBuilder initialized [2019-02-28 10:37:48,802 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "eureka_01.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:48" (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 10:37:48,865 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-02-28 10:37:48,865 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-02-28 10:37:49,229 INFO L281 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-02-28 10:37:49,229 INFO L286 CfgBuilder]: Removed 5 assue(true) statements. [2019-02-28 10:37:49,231 INFO L202 PluginConnector]: Adding new model eureka_01.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.02 10:37:49 BoogieIcfgContainer [2019-02-28 10:37:49,231 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-02-28 10:37:49,232 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-02-28 10:37:49,232 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-02-28 10:37:49,237 INFO L276 PluginConnector]: TraceAbstraction initialized [2019-02-28 10:37:49,237 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "eureka_01.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:48" (1/2) ... [2019-02-28 10:37:49,239 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@198c6743 and model type eureka_01.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.02 10:37:49, skipping insertion in model container [2019-02-28 10:37:49,239 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "eureka_01.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.02 10:37:49" (2/2) ... [2019-02-28 10:37:49,241 INFO L112 eAbstractionObserver]: Analyzing ICFG eureka_01.i_3.bpl [2019-02-28 10:37:49,254 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-02-28 10:37:49,264 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-02-28 10:37:49,280 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-02-28 10:37:49,318 INFO L382 AbstractCegarLoop]: Interprodecural is true [2019-02-28 10:37:49,318 INFO L383 AbstractCegarLoop]: Hoare is true [2019-02-28 10:37:49,319 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-02-28 10:37:49,319 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-02-28 10:37:49,319 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-02-28 10:37:49,319 INFO L387 AbstractCegarLoop]: Difference is false [2019-02-28 10:37:49,319 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-02-28 10:37:49,320 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-02-28 10:37:49,336 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2019-02-28 10:37:49,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2019-02-28 10:37:49,342 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:37:49,343 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2019-02-28 10:37:49,346 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:37:49,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:37:49,353 INFO L82 PathProgramCache]: Analyzing trace with hash 928714, now seen corresponding path program 1 times [2019-02-28 10:37:49,356 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:37:49,400 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:37:49,401 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:37:49,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:37:49,401 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:37:49,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:37:49,626 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 10:37:49,628 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-02-28 10:37:49,629 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-02-28 10:37:49,629 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-02-28 10:37:49,634 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-02-28 10:37:49,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-02-28 10:37:49,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-02-28 10:37:49,664 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2019-02-28 10:37:49,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:37:49,792 INFO L93 Difference]: Finished difference Result 11 states and 14 transitions. [2019-02-28 10:37:49,793 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-02-28 10:37:49,795 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2019-02-28 10:37:49,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:37:49,807 INFO L225 Difference]: With dead ends: 11 [2019-02-28 10:37:49,808 INFO L226 Difference]: Without dead ends: 7 [2019-02-28 10:37:49,811 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-02-28 10:37:49,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2019-02-28 10:37:49,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 6. [2019-02-28 10:37:49,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2019-02-28 10:37:49,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 7 transitions. [2019-02-28 10:37:49,844 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 7 transitions. Word has length 4 [2019-02-28 10:37:49,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:37:49,845 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 7 transitions. [2019-02-28 10:37:49,845 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-02-28 10:37:49,845 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 7 transitions. [2019-02-28 10:37:49,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2019-02-28 10:37:49,846 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:37:49,846 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2019-02-28 10:37:49,846 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:37:49,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:37:49,847 INFO L82 PathProgramCache]: Analyzing trace with hash 28791948, now seen corresponding path program 1 times [2019-02-28 10:37:49,847 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:37:49,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:37:49,848 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:37:49,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:37:49,849 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:37:49,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:37:49,973 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:37:49,973 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-02-28 10:37:49,974 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-02-28 10:37:49,974 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-02-28 10:37:49,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-02-28 10:37:49,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-02-28 10:37:49,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-02-28 10:37:49,977 INFO L87 Difference]: Start difference. First operand 6 states and 7 transitions. Second operand 4 states. [2019-02-28 10:37:50,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:37:50,054 INFO L93 Difference]: Finished difference Result 11 states and 13 transitions. [2019-02-28 10:37:50,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-02-28 10:37:50,055 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 5 [2019-02-28 10:37:50,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:37:50,055 INFO L225 Difference]: With dead ends: 11 [2019-02-28 10:37:50,056 INFO L226 Difference]: Without dead ends: 7 [2019-02-28 10:37:50,057 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-02-28 10:37:50,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2019-02-28 10:37:50,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2019-02-28 10:37:50,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2019-02-28 10:37:50,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2019-02-28 10:37:50,060 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 5 [2019-02-28 10:37:50,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:37:50,060 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2019-02-28 10:37:50,060 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-02-28 10:37:50,061 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2019-02-28 10:37:50,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-02-28 10:37:50,061 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:37:50,061 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-02-28 10:37:50,062 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:37:50,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:37:50,062 INFO L82 PathProgramCache]: Analyzing trace with hash 894131125, now seen corresponding path program 1 times [2019-02-28 10:37:50,062 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:37:50,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:37:50,064 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:37:50,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:37:50,064 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:37:50,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:37:50,186 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-02-28 10:37:50,187 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:37:50,187 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:37:50,188 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 7 with the following transitions: [2019-02-28 10:37:50,190 INFO L207 CegarAbsIntRunner]: [0], [5], [7], [12], [14], [16] [2019-02-28 10:37:50,245 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2019-02-28 10:37:50,245 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2)