java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_oct_cong.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/invert_string.i_4.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 17:44:25,941 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 17:44:25,945 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 17:44:25,957 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2018-12-03 17:44:26,009 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_oct_cong.epf [2018-12-03 17:44:26,033 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 17:44:26,034 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 17:44:26,035 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 17:44:26,035 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 17:44:26,036 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 17:44:26,036 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 17:44:26,036 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 17:44:26,036 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 17:44:26,037 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 17:44:26,037 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 17:44:26,037 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 17:44:26,037 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 17:44:26,037 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 17:44:26,038 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 17:44:26,039 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 17:44:26,039 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 17:44:26,039 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 17:44:26,039 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 17:44:26,039 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 17:44:26,041 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 17:44:26,041 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 17:44:26,042 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 17:44:26,042 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 17:44:26,042 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 17:44:26,042 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 17:44:26,043 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 17:44:26,043 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 17:44:26,043 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 17:44:26,043 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 17:44:26,043 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 17:44:26,044 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 17:44:26,045 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 17:44:26,045 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 17:44:26,045 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 17:44:26,045 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 17:44:26,045 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 17:44:26,046 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 17:44:26,046 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 17:44:26,046 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 17:44:26,101 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 17:44:26,117 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 17:44:26,123 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 17:44:26,126 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 17:44:26,126 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 17:44:26,127 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/invert_string.i_4.bpl [2018-12-03 17:44:26,127 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/invert_string.i_4.bpl' [2018-12-03 17:44:26,174 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 17:44:26,175 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 17:44:26,176 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 17:44:26,176 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 17:44:26,176 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 17:44:26,197 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "invert_string.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:44:26" (1/1) ... [2018-12-03 17:44:26,209 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "invert_string.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:44:26" (1/1) ... [2018-12-03 17:44:26,219 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 17:44:26,220 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 17:44:26,221 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 17:44:26,221 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 17:44:26,233 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "invert_string.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:44:26" (1/1) ... [2018-12-03 17:44:26,233 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "invert_string.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:44:26" (1/1) ... [2018-12-03 17:44:26,234 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "invert_string.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:44:26" (1/1) ... [2018-12-03 17:44:26,235 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "invert_string.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:44:26" (1/1) ... [2018-12-03 17:44:26,239 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "invert_string.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:44:26" (1/1) ... [2018-12-03 17:44:26,241 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "invert_string.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:44:26" (1/1) ... [2018-12-03 17:44:26,242 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "invert_string.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:44:26" (1/1) ... [2018-12-03 17:44:26,246 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 17:44:26,247 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 17:44:26,247 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 17:44:26,247 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 17:44:26,248 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "invert_string.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:44:26" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 17:44:26,322 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 17:44:26,323 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 17:44:26,579 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 17:44:26,580 INFO L280 CfgBuilder]: Removed 3 assue(true) statements. [2018-12-03 17:44:26,580 INFO L202 PluginConnector]: Adding new model invert_string.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 05:44:26 BoogieIcfgContainer [2018-12-03 17:44:26,580 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 17:44:26,582 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 17:44:26,582 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 17:44:26,585 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 17:44:26,585 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "invert_string.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:44:26" (1/2) ... [2018-12-03 17:44:26,587 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1be69d5e and model type invert_string.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 05:44:26, skipping insertion in model container [2018-12-03 17:44:26,587 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "invert_string.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 05:44:26" (2/2) ... [2018-12-03 17:44:26,589 INFO L112 eAbstractionObserver]: Analyzing ICFG invert_string.i_4.bpl [2018-12-03 17:44:26,601 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 17:44:26,610 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 17:44:26,629 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 17:44:26,665 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 17:44:26,666 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 17:44:26,666 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 17:44:26,666 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 17:44:26,667 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 17:44:26,667 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 17:44:26,667 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 17:44:26,667 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 17:44:26,684 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-12-03 17:44:26,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-03 17:44:26,691 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:44:26,692 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-12-03 17:44:26,695 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:44:26,701 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:44:26,702 INFO L82 PathProgramCache]: Analyzing trace with hash 928714, now seen corresponding path program 1 times [2018-12-03 17:44:26,704 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:44:26,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:44:26,762 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:44:26,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:44:26,763 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:44:26,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:44:26,877 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:44:26,880 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 17:44:26,880 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 17:44:26,881 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 17:44:26,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 17:44:26,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 17:44:26,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 17:44:26,920 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-12-03 17:44:27,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:44:27,027 INFO L93 Difference]: Finished difference Result 10 states and 12 transitions. [2018-12-03 17:44:27,028 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 17:44:27,029 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-12-03 17:44:27,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:44:27,042 INFO L225 Difference]: With dead ends: 10 [2018-12-03 17:44:27,042 INFO L226 Difference]: Without dead ends: 6 [2018-12-03 17:44:27,045 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 [2018-12-03 17:44:27,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2018-12-03 17:44:27,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2018-12-03 17:44:27,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2018-12-03 17:44:27,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 7 transitions. [2018-12-03 17:44:27,092 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 7 transitions. Word has length 4 [2018-12-03 17:44:27,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:44:27,092 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 7 transitions. [2018-12-03 17:44:27,092 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 17:44:27,092 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 7 transitions. [2018-12-03 17:44:27,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-03 17:44:27,093 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:44:27,093 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2018-12-03 17:44:27,093 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:44:27,094 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:44:27,094 INFO L82 PathProgramCache]: Analyzing trace with hash 28791948, now seen corresponding path program 1 times [2018-12-03 17:44:27,094 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:44:27,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:44:27,096 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:44:27,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:44:27,096 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:44:27,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:44:27,292 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:44:27,292 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 17:44:27,292 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 17:44:27,293 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 17:44:27,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 17:44:27,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 17:44:27,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-12-03 17:44:27,297 INFO L87 Difference]: Start difference. First operand 6 states and 7 transitions. Second operand 4 states. [2018-12-03 17:44:27,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:44:27,431 INFO L93 Difference]: Finished difference Result 11 states and 13 transitions. [2018-12-03 17:44:27,431 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 17:44:27,432 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 5 [2018-12-03 17:44:27,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:44:27,432 INFO L225 Difference]: With dead ends: 11 [2018-12-03 17:44:27,433 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 17:44:27,434 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-12-03 17:44:27,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 17:44:27,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-12-03 17:44:27,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 17:44:27,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2018-12-03 17:44:27,437 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 5 [2018-12-03 17:44:27,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:44:27,437 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2018-12-03 17:44:27,437 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 17:44:27,437 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2018-12-03 17:44:27,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 17:44:27,438 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:44:27,438 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-12-03 17:44:27,438 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:44:27,439 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:44:27,439 INFO L82 PathProgramCache]: Analyzing trace with hash 894131125, now seen corresponding path program 1 times [2018-12-03 17:44:27,439 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:44:27,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:44:27,440 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:44:27,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:44:27,441 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:44:27,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:44:27,643 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 11 DAG size of output: 11 [2018-12-03 17:44:27,717 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:44:27,718 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:44:27,718 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:44:27,719 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 7 with the following transitions: [2018-12-03 17:44:27,721 INFO L205 CegarAbsIntRunner]: [0], [5], [7], [12], [14], [16] [2018-12-03 17:44:27,780 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 17:44:27,781 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 17:44:27,873 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation.