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/20170319-ConjunctivePathPrograms/count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 17:26:08,176 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 17:26:08,178 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 17:26:08,190 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 17:26:08,191 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 17:26:08,192 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 17:26:08,193 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 17:26:08,195 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 17:26:08,197 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 17:26:08,198 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 17:26:08,199 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-12-03 17:26:08,224 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 17:26:08,243 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 17:26:08,245 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 17:26:08,245 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 17:26:08,246 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 17:26:08,246 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 17:26:08,246 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 17:26:08,246 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 17:26:08,247 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 17:26:08,247 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 17:26:08,247 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 17:26:08,248 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 17:26:08,248 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 17:26:08,248 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 17:26:08,249 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 17:26:08,249 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 17:26:08,249 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 17:26:08,250 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 17:26:08,251 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 17:26:08,251 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 17:26:08,251 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 17:26:08,252 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 17:26:08,252 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 17:26:08,252 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 17:26:08,252 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 17:26:08,252 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 17:26:08,253 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 17:26:08,253 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 17:26:08,254 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 17:26:08,254 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 17:26:08,254 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 17:26:08,254 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 17:26:08,254 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 17:26:08,255 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 17:26:08,255 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 17:26:08,256 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 17:26:08,256 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 17:26:08,256 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 17:26:08,256 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 17:26:08,256 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 17:26:08,313 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 17:26:08,328 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 17:26:08,333 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 17:26:08,336 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 17:26:08,336 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 17:26:08,337 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170319-ConjunctivePathPrograms/count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl [2018-12-03 17:26:08,337 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170319-ConjunctivePathPrograms/count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl' [2018-12-03 17:26:08,378 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 17:26:08,379 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 17:26:08,380 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 17:26:08,380 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 17:26:08,381 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 17:26:08,399 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:26:08" (1/1) ... [2018-12-03 17:26:08,408 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:26:08" (1/1) ... [2018-12-03 17:26:08,417 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 17:26:08,418 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 17:26:08,418 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 17:26:08,418 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 17:26:08,431 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:26:08" (1/1) ... [2018-12-03 17:26:08,431 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:26:08" (1/1) ... [2018-12-03 17:26:08,432 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:26:08" (1/1) ... [2018-12-03 17:26:08,432 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:26:08" (1/1) ... [2018-12-03 17:26:08,435 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:26:08" (1/1) ... [2018-12-03 17:26:08,437 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:26:08" (1/1) ... [2018-12-03 17:26:08,438 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:26:08" (1/1) ... [2018-12-03 17:26:08,440 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 17:26:08,440 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 17:26:08,441 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 17:26:08,441 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 17:26:08,442 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:26:08" (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 17:26:08,517 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2018-12-03 17:26:08,517 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 17:26:08,517 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 17:26:08,685 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 17:26:08,686 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-03 17:26:08,686 INFO L202 PluginConnector]: Adding new model count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 05:26:08 BoogieIcfgContainer [2018-12-03 17:26:08,686 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 17:26:08,688 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 17:26:08,688 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 17:26:08,691 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 17:26:08,691 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 05:26:08" (1/2) ... [2018-12-03 17:26:08,692 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15e1e053 and model type count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 05:26:08, skipping insertion in model container [2018-12-03 17:26:08,693 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 05:26:08" (2/2) ... [2018-12-03 17:26:08,695 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k.i_3.bplTransformedIcfg_BEv2_3.bpl [2018-12-03 17:26:08,705 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 17:26:08,712 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 17:26:08,730 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 17:26:08,765 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 17:26:08,766 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 17:26:08,766 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 17:26:08,766 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 17:26:08,766 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 17:26:08,767 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 17:26:08,767 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 17:26:08,767 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 17:26:08,783 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-12-03 17:26:08,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-12-03 17:26:08,789 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:08,790 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-12-03 17:26:08,793 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:08,799 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:08,800 INFO L82 PathProgramCache]: Analyzing trace with hash 30017, now seen corresponding path program 1 times [2018-12-03 17:26:08,803 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:08,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:08,860 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:26:08,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:08,860 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:08,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:08,992 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 17:26:08,994 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 17:26:08,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-03 17:26:08,994 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 17:26:08,999 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 17:26:09,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 17:26:09,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 17:26:09,017 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-12-03 17:26:09,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:09,074 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2018-12-03 17:26:09,075 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 17:26:09,076 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-12-03 17:26:09,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:09,087 INFO L225 Difference]: With dead ends: 9 [2018-12-03 17:26:09,088 INFO L226 Difference]: Without dead ends: 5 [2018-12-03 17:26:09,091 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 17:26:09,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states. [2018-12-03 17:26:09,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2018-12-03 17:26:09,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2018-12-03 17:26:09,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 5 transitions. [2018-12-03 17:26:09,126 INFO L78 Accepts]: Start accepts. Automaton has 5 states and 5 transitions. Word has length 3 [2018-12-03 17:26:09,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:09,126 INFO L480 AbstractCegarLoop]: Abstraction has 5 states and 5 transitions. [2018-12-03 17:26:09,127 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 17:26:09,127 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 5 transitions. [2018-12-03 17:26:09,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-03 17:26:09,127 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:09,127 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-12-03 17:26:09,128 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:09,128 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:09,128 INFO L82 PathProgramCache]: Analyzing trace with hash 928552, now seen corresponding path program 1 times [2018-12-03 17:26:09,128 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:09,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:09,129 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:26:09,130 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:09,130 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:09,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:09,230 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:09,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:09,231 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:09,232 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 5 with the following transitions: [2018-12-03 17:26:09,241 INFO L205 CegarAbsIntRunner]: [0], [5], [7], [9] [2018-12-03 17:26:09,341 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 17:26:09,342 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 17:26:09,765 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 17:26:09,771 INFO L272 AbstractInterpreter]: Visited 4 different actions 25 times. Merged at 3 different actions 21 times. Widened at 2 different actions 7 times. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 17:26:09,798 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:09,799 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 17:26:09,800 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:09,800 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:09,820 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:26:09,820 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:26:09,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:09,848 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:09,905 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:09,905 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:10,007 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:10,029 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:10,029 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2018-12-03 17:26:10,029 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:10,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 17:26:10,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 17:26:10,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-12-03 17:26:10,031 INFO L87 Difference]: Start difference. First operand 5 states and 5 transitions. Second operand 5 states. [2018-12-03 17:26:10,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:10,110 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2018-12-03 17:26:10,111 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 17:26:10,111 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 4 [2018-12-03 17:26:10,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:10,111 INFO L225 Difference]: With dead ends: 9 [2018-12-03 17:26:10,111 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 17:26:10,112 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-12-03 17:26:10,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 17:26:10,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-12-03 17:26:10,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 17:26:10,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-12-03 17:26:10,115 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-12-03 17:26:10,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:10,116 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-12-03 17:26:10,116 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 17:26:10,116 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-12-03 17:26:10,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 17:26:10,117 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:10,117 INFO L402 BasicCegarLoop]: trace histogram [3, 1, 1, 1] [2018-12-03 17:26:10,117 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:10,117 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:10,118 INFO L82 PathProgramCache]: Analyzing trace with hash 892275272, now seen corresponding path program 2 times [2018-12-03 17:26:10,118 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:10,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:10,119 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:26:10,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:10,119 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:10,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:10,226 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:10,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:10,227 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:10,227 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:10,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:10,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:10,228 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:10,239 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:26:10,239 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:26:10,257 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-03 17:26:10,258 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:26:10,259 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:10,401 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:10,402 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:10,698 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:10,717 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:10,717 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-12-03 17:26:10,718 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:10,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 17:26:10,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 17:26:10,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2018-12-03 17:26:10,721 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 7 states. [2018-12-03 17:26:10,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:10,943 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-12-03 17:26:10,944 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 17:26:10,944 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 6 [2018-12-03 17:26:10,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:10,945 INFO L225 Difference]: With dead ends: 11 [2018-12-03 17:26:10,945 INFO L226 Difference]: Without dead ends: 9 [2018-12-03 17:26:10,947 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2018-12-03 17:26:10,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-12-03 17:26:10,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-12-03 17:26:10,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-12-03 17:26:10,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-12-03 17:26:10,951 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-12-03 17:26:10,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:10,951 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-12-03 17:26:10,951 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 17:26:10,952 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-12-03 17:26:10,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-03 17:26:10,952 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:10,952 INFO L402 BasicCegarLoop]: trace histogram [5, 1, 1, 1] [2018-12-03 17:26:10,953 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:10,953 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:10,953 INFO L82 PathProgramCache]: Analyzing trace with hash -1516986008, now seen corresponding path program 3 times [2018-12-03 17:26:10,953 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:10,954 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:10,955 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:26:10,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:10,955 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:10,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:11,088 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:11,089 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:11,089 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:11,089 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:11,089 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:11,089 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:11,090 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:11,100 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:26:11,101 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:26:11,110 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:26:11,111 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:26:11,112 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:11,173 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:11,173 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:11,824 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:11,847 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:11,847 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2018-12-03 17:26:11,847 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:11,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-03 17:26:11,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-03 17:26:11,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=145, Unknown=0, NotChecked=0, Total=210 [2018-12-03 17:26:11,849 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 9 states. [2018-12-03 17:26:12,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:12,020 INFO L93 Difference]: Finished difference Result 13 states and 14 transitions. [2018-12-03 17:26:12,020 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 17:26:12,020 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 8 [2018-12-03 17:26:12,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:12,021 INFO L225 Difference]: With dead ends: 13 [2018-12-03 17:26:12,021 INFO L226 Difference]: Without dead ends: 11 [2018-12-03 17:26:12,022 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=129, Invalid=251, Unknown=0, NotChecked=0, Total=380 [2018-12-03 17:26:12,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-12-03 17:26:12,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-12-03 17:26:12,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-12-03 17:26:12,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-12-03 17:26:12,026 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-12-03 17:26:12,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:12,026 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-12-03 17:26:12,026 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-03 17:26:12,027 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-12-03 17:26:12,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 17:26:12,027 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:12,027 INFO L402 BasicCegarLoop]: trace histogram [7, 1, 1, 1] [2018-12-03 17:26:12,027 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:12,028 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:12,028 INFO L82 PathProgramCache]: Analyzing trace with hash -1829703544, now seen corresponding path program 4 times [2018-12-03 17:26:12,028 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:12,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:12,029 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:26:12,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:12,029 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:12,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:12,466 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:12,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:12,466 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:12,467 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:12,467 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:12,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:12,467 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:12,477 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:26:12,477 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:26:12,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:12,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:12,696 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:12,696 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:12,987 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:13,006 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:13,006 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2018-12-03 17:26:13,006 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:13,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 17:26:13,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 17:26:13,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2018-12-03 17:26:13,008 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 11 states. [2018-12-03 17:26:13,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:13,220 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2018-12-03 17:26:13,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 17:26:13,221 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 10 [2018-12-03 17:26:13,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:13,222 INFO L225 Difference]: With dead ends: 15 [2018-12-03 17:26:13,222 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 17:26:13,223 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2018-12-03 17:26:13,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 17:26:13,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-12-03 17:26:13,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-12-03 17:26:13,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-12-03 17:26:13,228 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-12-03 17:26:13,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:13,228 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-12-03 17:26:13,228 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 17:26:13,229 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-12-03 17:26:13,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 17:26:13,229 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:13,229 INFO L402 BasicCegarLoop]: trace histogram [9, 1, 1, 1] [2018-12-03 17:26:13,229 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:13,229 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:13,229 INFO L82 PathProgramCache]: Analyzing trace with hash -1703544920, now seen corresponding path program 5 times [2018-12-03 17:26:13,230 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:13,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:13,230 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:26:13,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:13,231 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:13,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:13,413 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:13,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:13,414 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:13,414 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:13,414 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:13,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:13,414 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:13,424 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:26:13,424 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:26:13,438 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-03 17:26:13,438 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:26:13,439 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:13,478 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:13,478 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:13,753 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:13,772 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:13,773 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-12-03 17:26:13,773 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:13,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 17:26:13,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 17:26:13,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=303, Unknown=0, NotChecked=0, Total=462 [2018-12-03 17:26:13,774 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 13 states. [2018-12-03 17:26:14,043 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 11 [2018-12-03 17:26:14,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:14,323 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2018-12-03 17:26:14,323 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 17:26:14,323 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 12 [2018-12-03 17:26:14,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:14,324 INFO L225 Difference]: With dead ends: 17 [2018-12-03 17:26:14,324 INFO L226 Difference]: Without dead ends: 15 [2018-12-03 17:26:14,325 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=339, Invalid=591, Unknown=0, NotChecked=0, Total=930 [2018-12-03 17:26:14,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-12-03 17:26:14,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-12-03 17:26:14,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-03 17:26:14,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-12-03 17:26:14,328 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-12-03 17:26:14,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:14,329 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-12-03 17:26:14,329 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 17:26:14,329 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-12-03 17:26:14,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-03 17:26:14,329 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:14,329 INFO L402 BasicCegarLoop]: trace histogram [11, 1, 1, 1] [2018-12-03 17:26:14,330 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:14,330 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:14,330 INFO L82 PathProgramCache]: Analyzing trace with hash -724191544, now seen corresponding path program 6 times [2018-12-03 17:26:14,330 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:14,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:14,331 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:26:14,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:14,331 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:14,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:14,737 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:14,737 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:14,738 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:14,738 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:14,738 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:14,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:14,738 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:14,755 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:26:14,755 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:26:14,775 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:26:14,775 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:26:14,778 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:14,902 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:14,902 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:15,391 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:15,412 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:15,412 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2018-12-03 17:26:15,412 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:15,412 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 17:26:15,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 17:26:15,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=472, Unknown=0, NotChecked=0, Total=702 [2018-12-03 17:26:15,413 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 15 states. [2018-12-03 17:26:15,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:15,977 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2018-12-03 17:26:15,978 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 17:26:15,979 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 14 [2018-12-03 17:26:15,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:15,979 INFO L225 Difference]: With dead ends: 19 [2018-12-03 17:26:15,979 INFO L226 Difference]: Without dead ends: 17 [2018-12-03 17:26:15,981 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=504, Invalid=902, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 17:26:15,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-12-03 17:26:15,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-12-03 17:26:15,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-12-03 17:26:15,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-12-03 17:26:15,986 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-12-03 17:26:15,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:15,986 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-12-03 17:26:15,987 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 17:26:15,987 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-12-03 17:26:15,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 17:26:15,987 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:15,988 INFO L402 BasicCegarLoop]: trace histogram [13, 1, 1, 1] [2018-12-03 17:26:15,988 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:15,988 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:15,988 INFO L82 PathProgramCache]: Analyzing trace with hash -163435032, now seen corresponding path program 7 times [2018-12-03 17:26:15,988 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:15,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:15,990 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:26:15,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:15,990 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:16,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:16,306 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:16,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:16,307 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:16,307 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:16,308 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:16,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:16,308 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:16,318 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:26:16,318 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:26:16,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:16,333 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:16,370 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:16,370 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:16,869 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:16,888 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:16,888 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 30 [2018-12-03 17:26:16,888 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:16,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 17:26:16,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 17:26:16,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=621, Unknown=0, NotChecked=0, Total=930 [2018-12-03 17:26:16,890 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 17 states. [2018-12-03 17:26:17,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:17,392 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2018-12-03 17:26:17,392 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 17:26:17,393 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 16 [2018-12-03 17:26:17,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:17,393 INFO L225 Difference]: With dead ends: 21 [2018-12-03 17:26:17,393 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 17:26:17,394 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=685, Invalid=1207, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 17:26:17,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 17:26:17,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-12-03 17:26:17,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 17:26:17,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-12-03 17:26:17,399 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-12-03 17:26:17,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:17,399 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-12-03 17:26:17,400 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 17:26:17,400 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-12-03 17:26:17,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 17:26:17,400 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:17,400 INFO L402 BasicCegarLoop]: trace histogram [15, 1, 1, 1] [2018-12-03 17:26:17,401 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:17,401 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:17,401 INFO L82 PathProgramCache]: Analyzing trace with hash 1852661000, now seen corresponding path program 8 times [2018-12-03 17:26:17,401 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:17,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:17,402 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:26:17,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:17,402 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:17,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:17,680 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:17,680 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:17,680 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:17,681 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:17,681 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:17,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:17,681 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:17,696 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:26:17,696 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:26:17,724 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-03 17:26:17,724 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:26:17,730 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:17,774 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:17,774 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:18,514 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:18,533 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:18,533 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-12-03 17:26:18,533 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:18,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 17:26:18,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 17:26:18,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=396, Invalid=726, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 17:26:18,538 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 19 states. [2018-12-03 17:26:19,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:19,285 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2018-12-03 17:26:19,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 17:26:19,286 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 18 [2018-12-03 17:26:19,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:19,286 INFO L225 Difference]: With dead ends: 23 [2018-12-03 17:26:19,286 INFO L226 Difference]: Without dead ends: 21 [2018-12-03 17:26:19,287 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=876, Invalid=1476, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 17:26:19,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-12-03 17:26:19,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-12-03 17:26:19,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 17:26:19,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-12-03 17:26:19,292 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-12-03 17:26:19,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:19,292 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-12-03 17:26:19,292 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 17:26:19,292 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-12-03 17:26:19,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 17:26:19,293 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:19,293 INFO L402 BasicCegarLoop]: trace histogram [17, 1, 1, 1] [2018-12-03 17:26:19,293 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:19,293 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:19,294 INFO L82 PathProgramCache]: Analyzing trace with hash -2004270040, now seen corresponding path program 9 times [2018-12-03 17:26:19,294 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:19,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:19,295 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:26:19,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:19,295 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:19,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:19,663 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:19,663 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:19,663 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:19,663 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:19,663 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:19,663 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:19,663 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:19,673 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:26:19,673 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:26:19,697 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:26:19,698 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:26:19,703 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:19,824 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:19,824 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:20,553 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:20,572 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:20,572 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 38 [2018-12-03 17:26:20,572 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:20,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 17:26:20,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 17:26:20,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=503, Invalid=979, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 17:26:20,574 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 21 states. [2018-12-03 17:26:20,963 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 11 [2018-12-03 17:26:21,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:21,437 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-12-03 17:26:21,438 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 17:26:21,438 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 20 [2018-12-03 17:26:21,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:21,439 INFO L225 Difference]: With dead ends: 25 [2018-12-03 17:26:21,439 INFO L226 Difference]: Without dead ends: 23 [2018-12-03 17:26:21,441 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1131, Invalid=1949, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 17:26:21,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-12-03 17:26:21,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-12-03 17:26:21,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-12-03 17:26:21,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-12-03 17:26:21,445 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-12-03 17:26:21,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:21,445 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-12-03 17:26:21,446 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 17:26:21,446 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-12-03 17:26:21,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-12-03 17:26:21,446 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:21,446 INFO L402 BasicCegarLoop]: trace histogram [19, 1, 1, 1] [2018-12-03 17:26:21,447 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:21,447 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:21,447 INFO L82 PathProgramCache]: Analyzing trace with hash -1958223032, now seen corresponding path program 10 times [2018-12-03 17:26:21,447 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:21,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:21,448 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:26:21,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:21,448 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:21,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:21,728 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:21,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:21,729 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:21,729 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:21,729 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:21,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:21,729 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:21,738 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:26:21,738 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:26:21,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:21,764 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:21,829 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:21,829 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:22,564 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:22,582 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:22,582 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 42 [2018-12-03 17:26:22,583 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:22,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 17:26:22,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 17:26:22,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=618, Invalid=1188, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 17:26:22,584 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 23 states. [2018-12-03 17:26:23,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:23,474 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2018-12-03 17:26:23,474 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 17:26:23,475 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 22 [2018-12-03 17:26:23,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:23,475 INFO L225 Difference]: With dead ends: 27 [2018-12-03 17:26:23,475 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 17:26:23,477 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1396, Invalid=2386, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 17:26:23,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 17:26:23,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-12-03 17:26:23,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-03 17:26:23,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-12-03 17:26:23,481 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-12-03 17:26:23,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:23,482 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-12-03 17:26:23,482 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 17:26:23,482 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-12-03 17:26:23,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 17:26:23,482 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:23,482 INFO L402 BasicCegarLoop]: trace histogram [21, 1, 1, 1] [2018-12-03 17:26:23,483 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:23,483 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:23,483 INFO L82 PathProgramCache]: Analyzing trace with hash -656721304, now seen corresponding path program 11 times [2018-12-03 17:26:23,483 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:23,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:23,484 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:26:23,484 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:23,484 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:23,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:23,816 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:23,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:23,817 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:23,817 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:23,817 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:23,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:23,818 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:23,834 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:26:23,834 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:26:23,859 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-03 17:26:23,860 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:26:23,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:23,929 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:23,929 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:25,257 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:25,277 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:25,277 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-12-03 17:26:25,278 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:25,278 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-03 17:26:25,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-03 17:26:25,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=1329, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 17:26:25,279 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 25 states. [2018-12-03 17:26:26,175 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2018-12-03 17:26:26,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:26,338 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2018-12-03 17:26:26,339 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 17:26:26,339 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 24 [2018-12-03 17:26:26,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:26,340 INFO L225 Difference]: With dead ends: 29 [2018-12-03 17:26:26,340 INFO L226 Difference]: Without dead ends: 27 [2018-12-03 17:26:26,342 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1665, Invalid=2757, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 17:26:26,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-12-03 17:26:26,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-12-03 17:26:26,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-03 17:26:26,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-12-03 17:26:26,347 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-12-03 17:26:26,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:26,347 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-12-03 17:26:26,347 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-03 17:26:26,347 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-12-03 17:26:26,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-03 17:26:26,348 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:26,348 INFO L402 BasicCegarLoop]: trace histogram [23, 1, 1, 1] [2018-12-03 17:26:26,349 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:26,349 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:26,349 INFO L82 PathProgramCache]: Analyzing trace with hash 250956168, now seen corresponding path program 12 times [2018-12-03 17:26:26,349 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:26,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:26,350 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:26:26,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:26,350 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:26,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:26,957 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:26,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:26,957 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:26,958 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:26,958 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:26,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:26,958 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:26,967 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:26:26,967 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:26:26,996 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:26:26,996 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:26:27,006 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:27,056 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:27,057 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:28,171 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:28,191 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:28,191 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2018-12-03 17:26:28,191 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:28,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 17:26:28,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 17:26:28,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=884, Invalid=1666, Unknown=0, NotChecked=0, Total=2550 [2018-12-03 17:26:28,193 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 27 states. [2018-12-03 17:26:29,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:29,791 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-12-03 17:26:29,791 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 17:26:29,792 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 26 [2018-12-03 17:26:29,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:29,792 INFO L225 Difference]: With dead ends: 31 [2018-12-03 17:26:29,792 INFO L226 Difference]: Without dead ends: 29 [2018-12-03 17:26:29,794 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2010, Invalid=3392, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 17:26:29,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-12-03 17:26:29,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-12-03 17:26:29,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-12-03 17:26:29,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-12-03 17:26:29,798 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-12-03 17:26:29,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:29,799 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-12-03 17:26:29,799 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 17:26:29,799 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-12-03 17:26:29,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-12-03 17:26:29,800 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:29,800 INFO L402 BasicCegarLoop]: trace histogram [25, 1, 1, 1] [2018-12-03 17:26:29,800 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:29,800 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:29,800 INFO L82 PathProgramCache]: Analyzing trace with hash 650645672, now seen corresponding path program 13 times [2018-12-03 17:26:29,800 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:29,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:29,801 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:26:29,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:29,801 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:29,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:30,354 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:30,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:30,355 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:30,355 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:30,356 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:30,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:30,356 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:30,365 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:26:30,365 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:26:30,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:30,406 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:30,479 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:30,480 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:32,590 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:32,609 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:32,609 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 54 [2018-12-03 17:26:32,610 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:32,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 17:26:32,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 17:26:32,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1935, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 17:26:32,612 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 29 states. [2018-12-03 17:26:32,923 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 11 [2018-12-03 17:26:34,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:34,155 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2018-12-03 17:26:34,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 17:26:34,155 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 28 [2018-12-03 17:26:34,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:34,156 INFO L225 Difference]: With dead ends: 33 [2018-12-03 17:26:34,156 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 17:26:34,159 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 377 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=2359, Invalid=3961, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 17:26:34,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 17:26:34,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-12-03 17:26:34,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-03 17:26:34,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-12-03 17:26:34,163 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-12-03 17:26:34,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:34,164 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-12-03 17:26:34,164 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 17:26:34,164 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-12-03 17:26:34,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-03 17:26:34,165 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:34,165 INFO L402 BasicCegarLoop]: trace histogram [27, 1, 1, 1] [2018-12-03 17:26:34,165 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:34,165 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:34,165 INFO L82 PathProgramCache]: Analyzing trace with hash -1794797624, now seen corresponding path program 14 times [2018-12-03 17:26:34,165 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:34,166 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:34,166 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:26:34,166 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:34,166 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:34,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:34,719 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:34,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:34,719 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:34,720 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:34,720 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:34,720 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:34,720 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:34,729 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:26:34,729 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:26:34,748 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-03 17:26:34,748 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:26:34,750 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:34,794 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:34,794 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:36,233 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:36,252 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:36,252 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-12-03 17:26:36,252 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:36,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-12-03 17:26:36,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-12-03 17:26:36,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1194, Invalid=2112, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 17:26:36,254 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 31 states. [2018-12-03 17:26:37,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:37,809 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2018-12-03 17:26:37,809 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 17:26:37,809 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 30 [2018-12-03 17:26:37,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:37,810 INFO L225 Difference]: With dead ends: 35 [2018-12-03 17:26:37,810 INFO L226 Difference]: Without dead ends: 33 [2018-12-03 17:26:37,813 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2706, Invalid=4434, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 17:26:37,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-03 17:26:37,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-12-03 17:26:37,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-03 17:26:37,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-12-03 17:26:37,818 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-12-03 17:26:37,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:37,818 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-12-03 17:26:37,818 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-12-03 17:26:37,818 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-12-03 17:26:37,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 17:26:37,819 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:37,819 INFO L402 BasicCegarLoop]: trace histogram [29, 1, 1, 1] [2018-12-03 17:26:37,819 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:37,820 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:37,820 INFO L82 PathProgramCache]: Analyzing trace with hash 1776273128, now seen corresponding path program 15 times [2018-12-03 17:26:37,820 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:37,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:37,821 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:26:37,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:37,821 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:37,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:38,371 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:38,371 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:38,371 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:38,372 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:38,372 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:38,372 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:38,372 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:38,382 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:26:38,382 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:26:38,419 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:26:38,419 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:26:38,436 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:38,499 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:38,499 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:39,844 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:39,863 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:39,863 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 62 [2018-12-03 17:26:39,863 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:39,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-12-03 17:26:39,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-12-03 17:26:39,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1373, Invalid=2533, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 17:26:39,866 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 33 states. [2018-12-03 17:26:41,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:41,812 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-12-03 17:26:41,812 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 17:26:41,812 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 32 [2018-12-03 17:26:41,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:41,813 INFO L225 Difference]: With dead ends: 37 [2018-12-03 17:26:41,813 INFO L226 Difference]: Without dead ends: 35 [2018-12-03 17:26:41,818 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3141, Invalid=5231, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 17:26:41,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-12-03 17:26:41,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-12-03 17:26:41,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-12-03 17:26:41,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-12-03 17:26:41,823 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-12-03 17:26:41,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:41,823 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-12-03 17:26:41,823 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-12-03 17:26:41,823 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-12-03 17:26:41,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-12-03 17:26:41,824 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:41,824 INFO L402 BasicCegarLoop]: trace histogram [31, 1, 1, 1] [2018-12-03 17:26:41,824 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:41,825 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:41,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1896396296, now seen corresponding path program 16 times [2018-12-03 17:26:41,825 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:41,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:41,826 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:26:41,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:41,826 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:41,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:42,436 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:42,436 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:42,436 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:42,436 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:42,436 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:42,436 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:42,437 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:42,448 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:26:42,449 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:26:42,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:42,513 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:42,582 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:42,582 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:44,080 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:44,098 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:44,098 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 66 [2018-12-03 17:26:44,098 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:44,099 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 17:26:44,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 17:26:44,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1560, Invalid=2862, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 17:26:44,101 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 35 states. [2018-12-03 17:26:46,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:46,338 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-12-03 17:26:46,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 17:26:46,338 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 34 [2018-12-03 17:26:46,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:46,339 INFO L225 Difference]: With dead ends: 39 [2018-12-03 17:26:46,339 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 17:26:46,341 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3574, Invalid=5932, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 17:26:46,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 17:26:46,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-12-03 17:26:46,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-03 17:26:46,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-12-03 17:26:46,346 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-12-03 17:26:46,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:46,346 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-12-03 17:26:46,346 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 17:26:46,346 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-12-03 17:26:46,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-12-03 17:26:46,347 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:46,347 INFO L402 BasicCegarLoop]: trace histogram [33, 1, 1, 1] [2018-12-03 17:26:46,347 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:46,347 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:46,347 INFO L82 PathProgramCache]: Analyzing trace with hash 1370643752, now seen corresponding path program 17 times [2018-12-03 17:26:46,347 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:46,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:46,348 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:26:46,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:46,348 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:46,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:47,192 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:47,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:47,192 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:47,192 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:47,193 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:47,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:47,193 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:47,201 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:26:47,201 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:26:47,224 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-03 17:26:47,224 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:26:47,226 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:47,269 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:47,269 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:48,855 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:48,873 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:48,873 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-12-03 17:26:48,873 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:48,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-12-03 17:26:48,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-12-03 17:26:48,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1755, Invalid=3075, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 17:26:48,875 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 37 states. [2018-12-03 17:26:51,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:51,388 INFO L93 Difference]: Finished difference Result 41 states and 42 transitions. [2018-12-03 17:26:51,389 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 17:26:51,389 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 36 [2018-12-03 17:26:51,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:51,390 INFO L225 Difference]: With dead ends: 41 [2018-12-03 17:26:51,390 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 17:26:51,392 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 595 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3999, Invalid=6507, Unknown=0, NotChecked=0, Total=10506 [2018-12-03 17:26:51,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 17:26:51,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-12-03 17:26:51,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-03 17:26:51,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-12-03 17:26:51,398 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-12-03 17:26:51,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:51,398 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-12-03 17:26:51,398 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-12-03 17:26:51,399 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-12-03 17:26:51,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 17:26:51,399 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:51,399 INFO L402 BasicCegarLoop]: trace histogram [35, 1, 1, 1] [2018-12-03 17:26:51,399 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:51,400 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:51,400 INFO L82 PathProgramCache]: Analyzing trace with hash -1366377400, now seen corresponding path program 18 times [2018-12-03 17:26:51,400 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:51,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:51,401 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:26:51,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:51,401 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:51,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:52,208 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:52,208 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:52,209 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:52,209 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:52,209 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:52,209 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:52,209 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:52,218 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:26:52,218 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:26:52,285 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:26:52,286 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:26:52,315 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:52,365 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:52,365 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:26:54,313 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:54,334 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:26:54,335 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 74 [2018-12-03 17:26:54,335 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:26:54,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-12-03 17:26:54,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-12-03 17:26:54,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1970, Invalid=3580, Unknown=0, NotChecked=0, Total=5550 [2018-12-03 17:26:54,336 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 39 states. [2018-12-03 17:26:56,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:26:56,982 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-12-03 17:26:56,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 17:26:56,983 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 38 [2018-12-03 17:26:56,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:26:56,984 INFO L225 Difference]: With dead ends: 43 [2018-12-03 17:26:56,984 INFO L226 Difference]: Without dead ends: 41 [2018-12-03 17:26:56,985 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 702 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=4524, Invalid=7466, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 17:26:56,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-12-03 17:26:56,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-12-03 17:26:56,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-12-03 17:26:56,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-12-03 17:26:56,991 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-12-03 17:26:56,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:26:56,991 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-12-03 17:26:56,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-12-03 17:26:56,991 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-12-03 17:26:56,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-12-03 17:26:56,992 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:26:56,992 INFO L402 BasicCegarLoop]: trace histogram [37, 1, 1, 1] [2018-12-03 17:26:56,992 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:26:56,993 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:26:56,993 INFO L82 PathProgramCache]: Analyzing trace with hash 1171247976, now seen corresponding path program 19 times [2018-12-03 17:26:56,993 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:26:56,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:56,994 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:26:56,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:26:56,994 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:26:57,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:58,319 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:58,320 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:58,320 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:26:58,320 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:26:58,320 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:26:58,320 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:26:58,320 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:26:58,329 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:26:58,329 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:26:58,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:26:58,421 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:26:58,501 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:26:58,501 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:27:00,882 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:00,902 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:27:00,902 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 78 [2018-12-03 17:27:00,902 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:27:00,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 17:27:00,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 17:27:00,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2193, Invalid=3969, Unknown=0, NotChecked=0, Total=6162 [2018-12-03 17:27:00,904 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 41 states. [2018-12-03 17:27:03,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:27:03,817 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2018-12-03 17:27:03,817 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 17:27:03,817 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 40 [2018-12-03 17:27:03,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:27:03,818 INFO L225 Difference]: With dead ends: 45 [2018-12-03 17:27:03,818 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 17:27:03,820 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 779 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=5041, Invalid=8299, Unknown=0, NotChecked=0, Total=13340 [2018-12-03 17:27:03,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 17:27:03,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-12-03 17:27:03,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-12-03 17:27:03,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-12-03 17:27:03,826 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2018-12-03 17:27:03,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:27:03,826 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-12-03 17:27:03,826 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 17:27:03,826 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-12-03 17:27:03,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 17:27:03,827 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:27:03,827 INFO L402 BasicCegarLoop]: trace histogram [39, 1, 1, 1] [2018-12-03 17:27:03,828 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:27:03,828 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:27:03,828 INFO L82 PathProgramCache]: Analyzing trace with hash 287810184, now seen corresponding path program 20 times [2018-12-03 17:27:03,828 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:27:03,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:27:03,829 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:27:03,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:27:03,829 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:27:03,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:27:05,014 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:05,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:27:05,014 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:27:05,014 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:27:05,014 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:27:05,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:27:05,014 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:27:05,025 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:27:05,025 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:27:05,053 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-12-03 17:27:05,053 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:27:05,056 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:27:05,119 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:05,119 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:27:07,608 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:07,628 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:27:07,629 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-12-03 17:27:07,629 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:27:07,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-12-03 17:27:07,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-12-03 17:27:07,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2424, Invalid=4218, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 17:27:07,630 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 43 states. [2018-12-03 17:27:11,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:27:11,232 INFO L93 Difference]: Finished difference Result 47 states and 48 transitions. [2018-12-03 17:27:11,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 17:27:11,233 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 42 [2018-12-03 17:27:11,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:27:11,234 INFO L225 Difference]: With dead ends: 47 [2018-12-03 17:27:11,234 INFO L226 Difference]: Without dead ends: 45 [2018-12-03 17:27:11,235 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 820 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=5544, Invalid=8976, Unknown=0, NotChecked=0, Total=14520 [2018-12-03 17:27:11,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-12-03 17:27:11,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-12-03 17:27:11,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 17:27:11,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-12-03 17:27:11,242 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2018-12-03 17:27:11,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:27:11,242 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-12-03 17:27:11,242 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-12-03 17:27:11,242 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-12-03 17:27:11,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-03 17:27:11,243 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:27:11,243 INFO L402 BasicCegarLoop]: trace histogram [41, 1, 1, 1] [2018-12-03 17:27:11,243 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:27:11,243 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:27:11,243 INFO L82 PathProgramCache]: Analyzing trace with hash 1707616680, now seen corresponding path program 21 times [2018-12-03 17:27:11,243 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:27:11,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:27:11,244 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:27:11,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:27:11,244 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:27:11,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:27:12,226 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:12,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:27:12,226 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:27:12,226 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:27:12,226 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:27:12,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:27:12,227 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:27:12,236 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:27:12,236 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:27:12,317 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:27:12,317 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:27:12,356 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:27:12,461 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:12,461 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:27:14,945 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:14,964 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:27:14,964 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 86 [2018-12-03 17:27:14,964 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:27:14,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-12-03 17:27:14,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-12-03 17:27:14,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2675, Invalid=4807, Unknown=0, NotChecked=0, Total=7482 [2018-12-03 17:27:14,965 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 45 states. [2018-12-03 17:27:18,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:27:18,853 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-12-03 17:27:18,856 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 17:27:18,857 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 44 [2018-12-03 17:27:18,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:27:18,857 INFO L225 Difference]: With dead ends: 49 [2018-12-03 17:27:18,858 INFO L226 Difference]: Without dead ends: 47 [2018-12-03 17:27:18,859 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 945 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=6159, Invalid=10097, Unknown=0, NotChecked=0, Total=16256 [2018-12-03 17:27:18,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-12-03 17:27:18,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-12-03 17:27:18,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-12-03 17:27:18,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-12-03 17:27:18,864 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2018-12-03 17:27:18,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:27:18,864 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-12-03 17:27:18,865 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-12-03 17:27:18,865 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-12-03 17:27:18,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-12-03 17:27:18,865 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:27:18,865 INFO L402 BasicCegarLoop]: trace histogram [43, 1, 1, 1] [2018-12-03 17:27:18,866 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:27:18,866 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:27:18,866 INFO L82 PathProgramCache]: Analyzing trace with hash 342059208, now seen corresponding path program 22 times [2018-12-03 17:27:18,866 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:27:18,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:27:18,867 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:27:18,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:27:18,867 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:27:18,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:27:19,931 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:19,932 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:27:19,932 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:27:19,932 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:27:19,932 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:27:19,932 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:27:19,932 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:27:19,942 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:27:19,942 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:27:20,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:27:20,076 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:27:20,152 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:20,152 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:27:23,144 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:23,163 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:27:23,163 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 90 [2018-12-03 17:27:23,163 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:27:23,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 17:27:23,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 17:27:23,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2934, Invalid=5256, Unknown=0, NotChecked=0, Total=8190 [2018-12-03 17:27:23,165 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 47 states. [2018-12-03 17:27:27,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:27:27,453 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2018-12-03 17:27:27,454 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 17:27:27,454 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 46 [2018-12-03 17:27:27,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:27:27,455 INFO L225 Difference]: With dead ends: 51 [2018-12-03 17:27:27,455 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 17:27:27,456 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1034 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=6760, Invalid=11062, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 17:27:27,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 17:27:27,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-12-03 17:27:27,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-03 17:27:27,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-12-03 17:27:27,461 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2018-12-03 17:27:27,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:27:27,461 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-12-03 17:27:27,461 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 17:27:27,461 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-12-03 17:27:27,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 17:27:27,462 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:27:27,462 INFO L402 BasicCegarLoop]: trace histogram [45, 1, 1, 1] [2018-12-03 17:27:27,462 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:27:27,462 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:27:27,462 INFO L82 PathProgramCache]: Analyzing trace with hash -1993646104, now seen corresponding path program 23 times [2018-12-03 17:27:27,463 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:27:27,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:27:27,463 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:27:27,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:27:27,463 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:27:27,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:27:28,730 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:28,730 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:27:28,730 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:27:28,731 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:27:28,731 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:27:28,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:27:28,731 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:27:28,741 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:27:28,741 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:27:28,823 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 17:27:28,824 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:27:28,826 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:27:29,065 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:29,065 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:27:32,089 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:32,111 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:27:32,111 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-12-03 17:27:32,111 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:27:32,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-12-03 17:27:32,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-12-03 17:27:32,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3201, Invalid=5541, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 17:27:32,112 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 49 states. [2018-12-03 17:27:36,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:27:36,913 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2018-12-03 17:27:36,914 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-12-03 17:27:36,914 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 48 [2018-12-03 17:27:36,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:27:36,915 INFO L225 Difference]: With dead ends: 53 [2018-12-03 17:27:36,915 INFO L226 Difference]: Without dead ends: 51 [2018-12-03 17:27:36,916 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1081 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=7341, Invalid=11841, Unknown=0, NotChecked=0, Total=19182 [2018-12-03 17:27:36,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-12-03 17:27:36,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-12-03 17:27:36,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-03 17:27:36,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-12-03 17:27:36,921 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2018-12-03 17:27:36,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:27:36,922 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-12-03 17:27:36,922 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-12-03 17:27:36,922 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-12-03 17:27:36,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-12-03 17:27:36,922 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:27:36,922 INFO L402 BasicCegarLoop]: trace histogram [47, 1, 1, 1] [2018-12-03 17:27:36,923 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:27:36,923 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:27:36,923 INFO L82 PathProgramCache]: Analyzing trace with hash -338555128, now seen corresponding path program 24 times [2018-12-03 17:27:36,923 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:27:36,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:27:36,924 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:27:36,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:27:36,924 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:27:37,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:27:38,179 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:38,179 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:27:38,179 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:27:38,179 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:27:38,180 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:27:38,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:27:38,180 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:27:38,188 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:27:38,188 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:27:38,296 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:27:38,296 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:27:38,353 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:27:38,438 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:38,438 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:27:41,987 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:42,006 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:27:42,007 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 98 [2018-12-03 17:27:42,007 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:27:42,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-12-03 17:27:42,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-12-03 17:27:42,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3488, Invalid=6214, Unknown=0, NotChecked=0, Total=9702 [2018-12-03 17:27:42,008 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 51 states. [2018-12-03 17:27:42,246 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 9 [2018-12-03 17:27:47,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:27:47,255 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-12-03 17:27:47,255 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-12-03 17:27:47,255 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 50 [2018-12-03 17:27:47,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:27:47,256 INFO L225 Difference]: With dead ends: 55 [2018-12-03 17:27:47,256 INFO L226 Difference]: Without dead ends: 53 [2018-12-03 17:27:47,258 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1224 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=8046, Invalid=13124, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 17:27:47,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-12-03 17:27:47,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-12-03 17:27:47,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-12-03 17:27:47,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-12-03 17:27:47,262 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2018-12-03 17:27:47,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:27:47,262 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-12-03 17:27:47,263 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-12-03 17:27:47,263 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-12-03 17:27:47,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-12-03 17:27:47,263 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:27:47,263 INFO L402 BasicCegarLoop]: trace histogram [49, 1, 1, 1] [2018-12-03 17:27:47,263 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:27:47,264 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:27:47,264 INFO L82 PathProgramCache]: Analyzing trace with hash 1065973288, now seen corresponding path program 25 times [2018-12-03 17:27:47,264 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:27:47,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:27:47,264 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:27:47,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:27:47,265 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:27:47,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:27:48,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:48,787 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:27:48,787 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:27:48,788 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:27:48,788 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:27:48,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:27:48,788 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:27:48,802 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:27:48,802 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:27:48,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:27:48,985 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:27:49,066 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:49,066 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:27:52,737 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:52,769 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:27:52,769 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 102 [2018-12-03 17:27:52,769 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:27:52,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 17:27:52,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 17:27:52,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3783, Invalid=6723, Unknown=0, NotChecked=0, Total=10506 [2018-12-03 17:27:52,771 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 53 states. [2018-12-03 17:27:53,056 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 9 [2018-12-03 17:27:53,177 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:27:53,302 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:27:53,428 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 17:27:58,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:27:58,470 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2018-12-03 17:27:58,470 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 17:27:58,470 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 52 [2018-12-03 17:27:58,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:27:58,471 INFO L225 Difference]: With dead ends: 57 [2018-12-03 17:27:58,471 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 17:27:58,473 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1325 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=8731, Invalid=14221, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 17:27:58,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 17:27:58,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-12-03 17:27:58,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-12-03 17:27:58,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-12-03 17:27:58,478 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2018-12-03 17:27:58,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:27:58,478 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-12-03 17:27:58,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 17:27:58,479 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-12-03 17:27:58,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-12-03 17:27:58,479 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:27:58,479 INFO L402 BasicCegarLoop]: trace histogram [51, 1, 1, 1] [2018-12-03 17:27:58,479 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:27:58,480 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:27:58,480 INFO L82 PathProgramCache]: Analyzing trace with hash -2096917176, now seen corresponding path program 26 times [2018-12-03 17:27:58,480 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:27:58,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:27:58,481 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:27:58,481 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:27:58,481 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:27:58,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:27:59,903 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:27:59,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:27:59,904 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:27:59,904 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:27:59,904 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:27:59,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:27:59,904 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:27:59,913 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:27:59,914 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:27:59,946 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-12-03 17:27:59,947 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:27:59,949 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:28:00,023 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:28:00,023 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:28:03,873 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:28:03,892 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:28:03,892 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-12-03 17:28:03,892 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:28:03,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 17:28:03,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 17:28:03,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4086, Invalid=7044, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 17:28:03,894 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 55 states. [2018-12-03 17:28:04,021 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 8 [2018-12-03 17:28:04,145 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 9 [2018-12-03 17:28:04,274 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:28:04,398 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:28:04,527 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:28:10,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:28:10,019 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2018-12-03 17:28:10,019 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 17:28:10,019 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 54 [2018-12-03 17:28:10,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:28:10,020 INFO L225 Difference]: With dead ends: 59 [2018-12-03 17:28:10,020 INFO L226 Difference]: Without dead ends: 57 [2018-12-03 17:28:10,022 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1378 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=9390, Invalid=15102, Unknown=0, NotChecked=0, Total=24492 [2018-12-03 17:28:10,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-12-03 17:28:10,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-12-03 17:28:10,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-03 17:28:10,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-12-03 17:28:10,027 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2018-12-03 17:28:10,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:28:10,028 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-12-03 17:28:10,028 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 17:28:10,028 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-12-03 17:28:10,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-12-03 17:28:10,028 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:28:10,028 INFO L402 BasicCegarLoop]: trace histogram [53, 1, 1, 1] [2018-12-03 17:28:10,029 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:28:10,029 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:28:10,029 INFO L82 PathProgramCache]: Analyzing trace with hash -797807512, now seen corresponding path program 27 times [2018-12-03 17:28:10,029 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:28:10,030 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:28:10,030 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:28:10,030 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:28:10,030 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:28:10,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:28:11,583 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:28:11,583 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:28:11,584 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:28:11,584 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:28:11,584 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:28:11,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:28:11,584 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:28:11,593 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:28:11,594 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:28:11,736 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:28:11,737 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:28:11,817 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:28:11,965 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:28:11,966 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:28:16,398 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:28:16,417 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:28:16,417 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 110 [2018-12-03 17:28:16,417 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:28:16,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-12-03 17:28:16,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-12-03 17:28:16,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4409, Invalid=7801, Unknown=0, NotChecked=0, Total=12210 [2018-12-03 17:28:16,418 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 57 states. [2018-12-03 17:28:16,561 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2018-12-03 17:28:16,695 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2018-12-03 17:28:16,830 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:28:16,966 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:28:17,103 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:28:17,245 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:28:17,399 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:28:17,544 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:28:20,703 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 11 [2018-12-03 17:28:23,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:28:23,362 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-12-03 17:28:23,362 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 17:28:23,362 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 56 [2018-12-03 17:28:23,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:28:23,363 INFO L225 Difference]: With dead ends: 61 [2018-12-03 17:28:23,363 INFO L226 Difference]: Without dead ends: 59 [2018-12-03 17:28:23,365 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1539 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=10185, Invalid=16547, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 17:28:23,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-12-03 17:28:23,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-12-03 17:28:23,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-12-03 17:28:23,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-12-03 17:28:23,370 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2018-12-03 17:28:23,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:28:23,370 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-12-03 17:28:23,370 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-12-03 17:28:23,371 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-12-03 17:28:23,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-12-03 17:28:23,371 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:28:23,371 INFO L402 BasicCegarLoop]: trace histogram [55, 1, 1, 1] [2018-12-03 17:28:23,371 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:28:23,372 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:28:23,372 INFO L82 PathProgramCache]: Analyzing trace with hash 2106063752, now seen corresponding path program 28 times [2018-12-03 17:28:23,372 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:28:23,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:28:23,373 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:28:23,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:28:23,373 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:28:23,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:28:25,055 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:28:25,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:28:25,055 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:28:25,055 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:28:25,055 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:28:25,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:28:25,055 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:28:25,064 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:28:25,064 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:28:25,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:28:25,311 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:28:25,424 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:28:25,425 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:28:30,044 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:28:30,064 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:28:30,064 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 114 [2018-12-03 17:28:30,064 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:28:30,065 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 17:28:30,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 17:28:30,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4740, Invalid=8370, Unknown=0, NotChecked=0, Total=13110 [2018-12-03 17:28:30,066 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 59 states. [2018-12-03 17:28:30,212 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 8 [2018-12-03 17:28:30,348 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 9 [2018-12-03 17:28:30,513 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:28:30,665 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:28:30,808 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:28:30,946 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:28:31,089 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:28:31,233 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:28:31,381 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:28:31,533 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:28:32,772 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 125 DAG size of output: 11 [2018-12-03 17:28:37,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:28:37,441 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2018-12-03 17:28:37,441 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 17:28:37,442 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 58 [2018-12-03 17:28:37,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:28:37,442 INFO L225 Difference]: With dead ends: 63 [2018-12-03 17:28:37,443 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 17:28:37,444 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1652 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=10954, Invalid=17776, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 17:28:37,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 17:28:37,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-12-03 17:28:37,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-12-03 17:28:37,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-12-03 17:28:37,449 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2018-12-03 17:28:37,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:28:37,449 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-12-03 17:28:37,449 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 17:28:37,449 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-12-03 17:28:37,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-12-03 17:28:37,450 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:28:37,450 INFO L402 BasicCegarLoop]: trace histogram [57, 1, 1, 1] [2018-12-03 17:28:37,450 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:28:37,450 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:28:37,450 INFO L82 PathProgramCache]: Analyzing trace with hash 997606056, now seen corresponding path program 29 times [2018-12-03 17:28:37,450 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:28:37,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:28:37,451 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:28:37,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:28:37,451 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:28:37,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:28:39,515 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:28:39,515 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:28:39,515 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:28:39,516 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:28:39,516 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:28:39,516 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:28:39,516 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:28:39,525 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:28:39,525 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:28:39,562 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-12-03 17:28:39,562 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:28:39,565 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:28:39,664 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:28:39,665 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:28:44,449 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:28:44,467 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:28:44,468 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 117 [2018-12-03 17:28:44,468 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:28:44,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-12-03 17:28:44,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-12-03 17:28:44,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5079, Invalid=8727, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 17:28:44,470 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 61 states. [2018-12-03 17:28:44,621 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 8 [2018-12-03 17:28:44,766 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 9 [2018-12-03 17:28:44,920 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:28:45,065 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:28:45,219 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:28:45,366 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:28:45,515 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:28:45,666 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:28:45,818 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:28:45,978 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:28:46,136 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:28:46,795 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 17:28:52,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:28:52,549 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2018-12-03 17:28:52,549 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-12-03 17:28:52,549 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 60 [2018-12-03 17:28:52,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:28:52,550 INFO L225 Difference]: With dead ends: 65 [2018-12-03 17:28:52,550 INFO L226 Difference]: Without dead ends: 63 [2018-12-03 17:28:52,552 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1711 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=11691, Invalid=18759, Unknown=0, NotChecked=0, Total=30450 [2018-12-03 17:28:52,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-12-03 17:28:52,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-12-03 17:28:52,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-03 17:28:52,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-12-03 17:28:52,558 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2018-12-03 17:28:52,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:28:52,558 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-12-03 17:28:52,558 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-12-03 17:28:52,558 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-12-03 17:28:52,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 17:28:52,559 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:28:52,559 INFO L402 BasicCegarLoop]: trace histogram [59, 1, 1, 1] [2018-12-03 17:28:52,559 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:28:52,559 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:28:52,559 INFO L82 PathProgramCache]: Analyzing trace with hash 921649608, now seen corresponding path program 30 times [2018-12-03 17:28:52,560 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:28:52,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:28:52,560 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:28:52,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:28:52,561 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:28:52,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:28:54,750 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:28:54,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:28:54,750 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:28:54,750 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:28:54,750 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:28:54,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:28:54,750 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:28:54,760 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:28:54,761 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:28:54,950 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:28:54,951 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:28:55,058 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:28:55,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:28:55,204 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:29:00,408 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:29:00,428 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:29:00,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 122 [2018-12-03 17:29:00,428 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:29:00,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-12-03 17:29:00,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-12-03 17:29:00,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5438, Invalid=9568, Unknown=0, NotChecked=0, Total=15006 [2018-12-03 17:29:00,430 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 63 states. [2018-12-03 17:29:00,604 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 8 [2018-12-03 17:29:00,757 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 9 [2018-12-03 17:29:00,919 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:29:01,077 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:29:01,242 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:29:01,400 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:29:01,557 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:29:01,719 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:29:01,883 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:29:02,051 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:29:02,216 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:29:02,377 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:29:03,590 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 11 [2018-12-03 17:29:09,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:29:09,244 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-12-03 17:29:09,244 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 17:29:09,245 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 62 [2018-12-03 17:29:09,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:29:09,245 INFO L225 Difference]: With dead ends: 67 [2018-12-03 17:29:09,246 INFO L226 Difference]: Without dead ends: 65 [2018-12-03 17:29:09,247 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1890 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=12576, Invalid=20366, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 17:29:09,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-12-03 17:29:09,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2018-12-03 17:29:09,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-12-03 17:29:09,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-12-03 17:29:09,251 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2018-12-03 17:29:09,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:29:09,251 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-12-03 17:29:09,252 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-12-03 17:29:09,252 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-12-03 17:29:09,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-12-03 17:29:09,252 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:29:09,252 INFO L402 BasicCegarLoop]: trace histogram [61, 1, 1, 1] [2018-12-03 17:29:09,252 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:29:09,252 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:29:09,253 INFO L82 PathProgramCache]: Analyzing trace with hash 941947112, now seen corresponding path program 31 times [2018-12-03 17:29:09,253 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:29:09,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:29:09,253 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:29:09,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:29:09,254 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:29:09,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:29:11,207 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:29:11,208 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:29:11,208 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:29:11,208 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:29:11,208 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:29:11,208 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:29:11,208 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:29:11,216 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:29:11,216 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:29:11,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:29:11,543 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:29:11,649 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:29:11,649 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:29:17,241 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:29:17,260 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:29:17,260 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 126 [2018-12-03 17:29:17,260 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:29:17,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 17:29:17,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 17:29:17,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5805, Invalid=10197, Unknown=0, NotChecked=0, Total=16002 [2018-12-03 17:29:17,261 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 65 states. [2018-12-03 17:29:17,433 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2018-12-03 17:29:17,596 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 9 [2018-12-03 17:29:17,759 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:29:17,920 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:29:18,088 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:29:18,257 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:29:18,429 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:29:18,592 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:29:18,787 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:29:18,980 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:29:19,162 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:29:19,330 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:29:19,503 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:29:19,687 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:29:19,871 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:29:26,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:29:26,607 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-12-03 17:29:26,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 17:29:26,608 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 64 [2018-12-03 17:29:26,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:29:26,609 INFO L225 Difference]: With dead ends: 69 [2018-12-03 17:29:26,609 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 17:29:26,611 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2015 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=13429, Invalid=21727, Unknown=0, NotChecked=0, Total=35156 [2018-12-03 17:29:26,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 17:29:26,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-12-03 17:29:26,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-12-03 17:29:26,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2018-12-03 17:29:26,616 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2018-12-03 17:29:26,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:29:26,616 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2018-12-03 17:29:26,616 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 17:29:26,617 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2018-12-03 17:29:26,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-12-03 17:29:26,617 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:29:26,617 INFO L402 BasicCegarLoop]: trace histogram [63, 1, 1, 1] [2018-12-03 17:29:26,617 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:29:26,618 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:29:26,618 INFO L82 PathProgramCache]: Analyzing trace with hash -1026988024, now seen corresponding path program 32 times [2018-12-03 17:29:26,618 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:29:26,618 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:29:26,619 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:29:26,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:29:26,619 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:29:26,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:29:29,544 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:29:29,544 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:29:29,544 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:29:29,545 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:29:29,545 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:29:29,545 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:29:29,545 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:29:29,553 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:29:29,553 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:29:29,616 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-12-03 17:29:29,616 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:29:29,619 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:29:29,725 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:29:29,725 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:29:35,474 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:29:35,493 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:29:35,493 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 129 [2018-12-03 17:29:35,493 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:29:35,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-12-03 17:29:35,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-12-03 17:29:35,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6180, Invalid=10590, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 17:29:35,495 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 67 states. [2018-12-03 17:29:35,670 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 8 [2018-12-03 17:29:35,843 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 9 [2018-12-03 17:29:36,017 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:29:36,190 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:29:36,374 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:29:36,548 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:29:36,722 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:29:36,893 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:29:37,071 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:29:37,253 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:29:37,430 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:29:37,616 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:29:37,791 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:29:37,972 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:29:38,160 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:29:38,340 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:29:39,296 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 17:29:39,508 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-12-03 17:29:45,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:29:45,724 INFO L93 Difference]: Finished difference Result 71 states and 72 transitions. [2018-12-03 17:29:45,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 17:29:45,725 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 66 [2018-12-03 17:29:45,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:29:45,726 INFO L225 Difference]: With dead ends: 71 [2018-12-03 17:29:45,726 INFO L226 Difference]: Without dead ends: 69 [2018-12-03 17:29:45,727 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2080 ImplicationChecksByTransitivity, 18.4s TimeCoverageRelationStatistics Valid=14244, Invalid=22812, Unknown=0, NotChecked=0, Total=37056 [2018-12-03 17:29:45,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-12-03 17:29:45,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-12-03 17:29:45,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-12-03 17:29:45,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-12-03 17:29:45,733 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2018-12-03 17:29:45,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:29:45,733 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-12-03 17:29:45,733 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-12-03 17:29:45,733 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-12-03 17:29:45,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-12-03 17:29:45,734 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:29:45,734 INFO L402 BasicCegarLoop]: trace histogram [65, 1, 1, 1] [2018-12-03 17:29:45,734 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:29:45,734 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:29:45,734 INFO L82 PathProgramCache]: Analyzing trace with hash 906923816, now seen corresponding path program 33 times [2018-12-03 17:29:45,734 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:29:45,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:29:45,735 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:29:45,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:29:45,735 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:29:45,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:29:48,071 INFO L134 CoverageAnalysis]: Checked inductivity of 2145 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:29:48,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:29:48,071 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:29:48,071 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:29:48,071 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:29:48,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:29:48,072 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:29:48,081 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:29:48,081 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:29:48,325 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:29:48,326 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:29:48,467 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:29:48,571 INFO L134 CoverageAnalysis]: Checked inductivity of 2145 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:29:48,571 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:29:55,276 INFO L134 CoverageAnalysis]: Checked inductivity of 2145 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:29:55,295 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:29:55,295 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 134 [2018-12-03 17:29:55,295 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:29:55,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-12-03 17:29:55,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-12-03 17:29:55,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6575, Invalid=11515, Unknown=0, NotChecked=0, Total=18090 [2018-12-03 17:29:55,296 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 69 states. [2018-12-03 17:29:55,485 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2018-12-03 17:29:55,661 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2018-12-03 17:29:55,844 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:29:56,028 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:29:56,215 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:29:56,396 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:29:56,579 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:29:56,769 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:29:56,957 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:29:57,153 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:29:57,346 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:29:57,540 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:29:57,715 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:29:57,899 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:29:58,091 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:29:58,277 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:29:58,465 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:29:58,662 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:29:58,854 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:29:59,051 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:30:06,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:30:06,240 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2018-12-03 17:30:06,241 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-12-03 17:30:06,241 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 68 [2018-12-03 17:30:06,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:30:06,242 INFO L225 Difference]: With dead ends: 73 [2018-12-03 17:30:06,242 INFO L226 Difference]: Without dead ends: 71 [2018-12-03 17:30:06,243 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2277 ImplicationChecksByTransitivity, 19.4s TimeCoverageRelationStatistics Valid=15219, Invalid=24581, Unknown=0, NotChecked=0, Total=39800 [2018-12-03 17:30:06,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-12-03 17:30:06,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2018-12-03 17:30:06,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-12-03 17:30:06,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2018-12-03 17:30:06,247 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2018-12-03 17:30:06,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:30:06,247 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2018-12-03 17:30:06,247 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-12-03 17:30:06,247 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2018-12-03 17:30:06,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-12-03 17:30:06,248 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:30:06,248 INFO L402 BasicCegarLoop]: trace histogram [67, 1, 1, 1] [2018-12-03 17:30:06,248 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:30:06,248 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:30:06,248 INFO L82 PathProgramCache]: Analyzing trace with hash -324637112, now seen corresponding path program 34 times [2018-12-03 17:30:06,248 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:30:06,249 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:30:06,249 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:30:06,249 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:30:06,249 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:30:06,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:30:09,588 INFO L134 CoverageAnalysis]: Checked inductivity of 2278 backedges. 0 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:30:09,588 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:30:09,588 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:30:09,588 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:30:09,588 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:30:09,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:30:09,589 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:30:09,599 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:30:09,599 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:30:09,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:30:10,026 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:30:10,169 INFO L134 CoverageAnalysis]: Checked inductivity of 2278 backedges. 0 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:30:10,169 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:30:16,858 INFO L134 CoverageAnalysis]: Checked inductivity of 2278 backedges. 0 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:30:16,876 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:30:16,876 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 138 [2018-12-03 17:30:16,877 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:30:16,877 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 17:30:16,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 17:30:16,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6978, Invalid=12204, Unknown=0, NotChecked=0, Total=19182 [2018-12-03 17:30:16,878 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 71 states. [2018-12-03 17:30:17,069 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 8 [2018-12-03 17:30:17,255 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 9 [2018-12-03 17:30:17,451 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:30:17,655 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:30:17,848 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:30:18,037 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:30:18,232 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:30:18,435 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:30:18,638 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:30:18,839 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:30:19,034 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:30:19,241 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:30:19,442 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:30:19,633 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:30:19,838 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:30:20,033 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:30:20,263 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:30:20,496 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:30:20,693 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:30:20,895 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:30:21,101 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:30:28,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:30:28,654 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2018-12-03 17:30:28,655 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 17:30:28,655 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 70 [2018-12-03 17:30:28,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:30:28,656 INFO L225 Difference]: With dead ends: 75 [2018-12-03 17:30:28,656 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 17:30:28,658 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2414 ImplicationChecksByTransitivity, 21.3s TimeCoverageRelationStatistics Valid=16156, Invalid=26074, Unknown=0, NotChecked=0, Total=42230 [2018-12-03 17:30:28,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 17:30:28,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2018-12-03 17:30:28,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-03 17:30:28,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2018-12-03 17:30:28,663 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2018-12-03 17:30:28,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:30:28,664 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2018-12-03 17:30:28,664 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 17:30:28,664 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2018-12-03 17:30:28,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 17:30:28,664 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:30:28,664 INFO L402 BasicCegarLoop]: trace histogram [69, 1, 1, 1] [2018-12-03 17:30:28,665 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:30:28,665 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:30:28,665 INFO L82 PathProgramCache]: Analyzing trace with hash 1556284776, now seen corresponding path program 35 times [2018-12-03 17:30:28,665 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:30:28,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:30:28,666 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:30:28,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:30:28,666 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:30:28,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:30:31,736 INFO L134 CoverageAnalysis]: Checked inductivity of 2415 backedges. 0 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:30:31,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:30:31,736 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:30:31,736 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:30:31,736 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:30:31,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:30:31,737 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:30:31,744 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:30:31,745 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:30:31,796 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-12-03 17:30:31,796 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:30:31,799 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:30:31,901 INFO L134 CoverageAnalysis]: Checked inductivity of 2415 backedges. 0 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:30:31,901 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:30:38,670 INFO L134 CoverageAnalysis]: Checked inductivity of 2415 backedges. 0 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:30:38,689 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:30:38,690 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 141 [2018-12-03 17:30:38,690 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:30:38,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-12-03 17:30:38,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-12-03 17:30:38,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7389, Invalid=12633, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 17:30:38,691 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 73 states. [2018-12-03 17:30:38,889 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 8 [2018-12-03 17:30:39,081 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 9 [2018-12-03 17:30:39,284 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:30:39,486 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:30:39,691 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:30:39,887 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:30:40,090 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:30:40,292 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:30:40,515 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:30:40,738 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:30:40,971 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:30:41,182 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:30:41,386 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:30:41,593 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:30:41,812 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:30:42,023 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:30:42,235 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:30:42,446 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:30:42,658 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:30:42,870 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:30:43,094 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:30:43,315 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:30:43,533 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:30:46,109 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 116 DAG size of output: 11 [2018-12-03 17:30:51,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:30:51,580 INFO L93 Difference]: Finished difference Result 77 states and 78 transitions. [2018-12-03 17:30:51,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-12-03 17:30:51,581 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 72 [2018-12-03 17:30:51,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:30:51,581 INFO L225 Difference]: With dead ends: 77 [2018-12-03 17:30:51,582 INFO L226 Difference]: Without dead ends: 75 [2018-12-03 17:30:51,583 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2485 ImplicationChecksByTransitivity, 22.1s TimeCoverageRelationStatistics Valid=17049, Invalid=27261, Unknown=0, NotChecked=0, Total=44310 [2018-12-03 17:30:51,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-12-03 17:30:51,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-12-03 17:30:51,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-12-03 17:30:51,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-12-03 17:30:51,589 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2018-12-03 17:30:51,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:30:51,589 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-12-03 17:30:51,589 INFO L481 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-12-03 17:30:51,589 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-12-03 17:30:51,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-12-03 17:30:51,589 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:30:51,590 INFO L402 BasicCegarLoop]: trace histogram [71, 1, 1, 1] [2018-12-03 17:30:51,590 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:30:51,590 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:30:51,590 INFO L82 PathProgramCache]: Analyzing trace with hash 940987528, now seen corresponding path program 36 times [2018-12-03 17:30:51,590 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:30:51,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:30:51,591 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:30:51,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:30:51,591 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:30:51,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:30:54,345 INFO L134 CoverageAnalysis]: Checked inductivity of 2556 backedges. 0 proven. 2556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:30:54,345 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:30:54,345 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:30:54,345 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:30:54,345 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:30:54,345 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:30:54,346 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:30:54,354 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:30:54,354 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:30:54,661 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:30:54,661 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:30:54,844 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:30:55,005 INFO L134 CoverageAnalysis]: Checked inductivity of 2556 backedges. 0 proven. 2556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:30:55,005 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:31:02,572 INFO L134 CoverageAnalysis]: Checked inductivity of 2556 backedges. 0 proven. 2556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:31:02,591 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:31:02,591 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 146 [2018-12-03 17:31:02,591 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:31:02,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-12-03 17:31:02,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-12-03 17:31:02,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7820, Invalid=13642, Unknown=0, NotChecked=0, Total=21462 [2018-12-03 17:31:02,593 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 75 states. [2018-12-03 17:31:02,849 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 8 [2018-12-03 17:31:03,045 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 9 [2018-12-03 17:31:03,252 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:31:03,461 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:31:03,668 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:31:03,870 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:31:04,076 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:31:04,301 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:31:04,524 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:31:04,738 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:31:04,957 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:31:05,173 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:31:05,390 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:31:05,604 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:31:05,822 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:31:06,050 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:31:06,290 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:31:06,564 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:31:06,788 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:31:07,014 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:31:07,255 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:31:07,477 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:31:07,693 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:31:07,922 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:31:08,148 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:31:08,365 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:31:09,032 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 17:31:16,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:31:16,527 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-12-03 17:31:16,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 17:31:16,528 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 74 [2018-12-03 17:31:16,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:31:16,529 INFO L225 Difference]: With dead ends: 79 [2018-12-03 17:31:16,529 INFO L226 Difference]: Without dead ends: 77 [2018-12-03 17:31:16,530 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2700 ImplicationChecksByTransitivity, 23.5s TimeCoverageRelationStatistics Valid=18114, Invalid=29192, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 17:31:16,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-12-03 17:31:16,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2018-12-03 17:31:16,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-12-03 17:31:16,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2018-12-03 17:31:16,536 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2018-12-03 17:31:16,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:31:16,536 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2018-12-03 17:31:16,536 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-12-03 17:31:16,537 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2018-12-03 17:31:16,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-12-03 17:31:16,537 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:31:16,537 INFO L402 BasicCegarLoop]: trace histogram [73, 1, 1, 1] [2018-12-03 17:31:16,537 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:31:16,538 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:31:16,538 INFO L82 PathProgramCache]: Analyzing trace with hash -1949148248, now seen corresponding path program 37 times [2018-12-03 17:31:16,538 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:31:16,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:31:16,539 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:31:16,539 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:31:16,539 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:31:16,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:31:19,405 INFO L134 CoverageAnalysis]: Checked inductivity of 2701 backedges. 0 proven. 2701 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:31:19,406 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:31:19,406 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:31:19,406 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:31:19,406 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:31:19,406 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:31:19,407 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:31:19,423 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:31:19,423 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:31:19,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:31:19,981 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:31:20,100 INFO L134 CoverageAnalysis]: Checked inductivity of 2701 backedges. 0 proven. 2701 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:31:20,101 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:31:28,021 INFO L134 CoverageAnalysis]: Checked inductivity of 2701 backedges. 0 proven. 2701 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:31:28,039 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:31:28,040 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 150 [2018-12-03 17:31:28,040 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:31:28,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 17:31:28,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 17:31:28,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8259, Invalid=14391, Unknown=0, NotChecked=0, Total=22650 [2018-12-03 17:31:28,041 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 77 states. [2018-12-03 17:31:28,272 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2018-12-03 17:31:28,481 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 9 [2018-12-03 17:31:28,702 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:31:28,916 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:31:29,141 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:31:29,356 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:31:29,575 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:31:29,798 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:31:30,029 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:31:30,260 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:31:30,494 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:31:30,726 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:31:30,949 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:31:31,171 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:31:31,403 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:31:31,648 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:31:31,922 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:31:32,192 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:31:32,429 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:31:32,668 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:31:32,902 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:31:33,139 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:31:33,377 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:31:33,615 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:31:33,858 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:31:34,108 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:31:34,344 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:31:34,573 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:31:42,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:31:42,870 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2018-12-03 17:31:42,870 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 17:31:42,870 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 76 [2018-12-03 17:31:42,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:31:42,871 INFO L225 Difference]: With dead ends: 81 [2018-12-03 17:31:42,871 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 17:31:42,873 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2849 ImplicationChecksByTransitivity, 24.9s TimeCoverageRelationStatistics Valid=19135, Invalid=30817, Unknown=0, NotChecked=0, Total=49952 [2018-12-03 17:31:42,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 17:31:42,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-12-03 17:31:42,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-12-03 17:31:42,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-12-03 17:31:42,878 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2018-12-03 17:31:42,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:31:42,878 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-12-03 17:31:42,878 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 17:31:42,878 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-12-03 17:31:42,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-12-03 17:31:42,878 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:31:42,878 INFO L402 BasicCegarLoop]: trace histogram [75, 1, 1, 1] [2018-12-03 17:31:42,879 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:31:42,879 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:31:42,879 INFO L82 PathProgramCache]: Analyzing trace with hash -525788472, now seen corresponding path program 38 times [2018-12-03 17:31:42,879 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:31:42,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:31:42,880 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:31:42,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:31:42,880 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:31:43,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:31:46,269 INFO L134 CoverageAnalysis]: Checked inductivity of 2850 backedges. 0 proven. 2850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:31:46,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:31:46,270 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:31:46,270 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:31:46,270 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:31:46,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:31:46,270 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:31:46,287 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:31:46,287 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:31:46,404 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-12-03 17:31:46,404 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:31:46,408 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:31:46,530 INFO L134 CoverageAnalysis]: Checked inductivity of 2850 backedges. 0 proven. 2850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:31:46,530 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:31:54,737 INFO L134 CoverageAnalysis]: Checked inductivity of 2850 backedges. 0 proven. 2850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:31:54,757 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:31:54,757 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 153 [2018-12-03 17:31:54,757 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:31:54,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-12-03 17:31:54,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-12-03 17:31:54,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8706, Invalid=14856, Unknown=0, NotChecked=0, Total=23562 [2018-12-03 17:31:54,759 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 79 states. [2018-12-03 17:31:55,033 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 8 [2018-12-03 17:31:55,255 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 9 [2018-12-03 17:31:55,482 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:31:55,704 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:31:55,931 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:31:56,157 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:31:56,386 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:31:56,629 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:31:56,869 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:31:57,109 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:31:57,347 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:31:57,614 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:31:57,858 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:31:58,098 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:31:58,347 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:31:58,590 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:31:58,844 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:31:59,088 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:31:59,337 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:31:59,582 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:31:59,839 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:32:00,080 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:32:00,330 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:32:00,575 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:32:00,817 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:32:01,070 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:32:01,309 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:32:01,556 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:32:01,803 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:32:02,795 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 17:32:10,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:10,427 INFO L93 Difference]: Finished difference Result 83 states and 84 transitions. [2018-12-03 17:32:10,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-12-03 17:32:10,428 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 78 [2018-12-03 17:32:10,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:10,429 INFO L225 Difference]: With dead ends: 83 [2018-12-03 17:32:10,429 INFO L226 Difference]: Without dead ends: 81 [2018-12-03 17:32:10,431 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 227 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2926 ImplicationChecksByTransitivity, 26.5s TimeCoverageRelationStatistics Valid=20106, Invalid=32106, Unknown=0, NotChecked=0, Total=52212 [2018-12-03 17:32:10,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-12-03 17:32:10,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-12-03 17:32:10,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-12-03 17:32:10,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-12-03 17:32:10,435 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2018-12-03 17:32:10,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:10,436 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-12-03 17:32:10,436 INFO L481 AbstractCegarLoop]: Interpolant automaton has 79 states. [2018-12-03 17:32:10,436 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-12-03 17:32:10,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-12-03 17:32:10,436 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:10,436 INFO L402 BasicCegarLoop]: trace histogram [77, 1, 1, 1] [2018-12-03 17:32:10,436 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:10,436 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:10,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1523356136, now seen corresponding path program 39 times [2018-12-03 17:32:10,437 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:10,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:10,437 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:32:10,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:10,437 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:10,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:14,028 INFO L134 CoverageAnalysis]: Checked inductivity of 3003 backedges. 0 proven. 3003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:32:14,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:14,028 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:14,028 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:14,029 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:14,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:14,029 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:32:14,037 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:32:14,037 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:32:14,450 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:32:14,450 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:32:14,684 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:14,804 INFO L134 CoverageAnalysis]: Checked inductivity of 3003 backedges. 0 proven. 3003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:32:14,805 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:23,687 INFO L134 CoverageAnalysis]: Checked inductivity of 3003 backedges. 0 proven. 3003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:32:23,707 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:23,707 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 158 [2018-12-03 17:32:23,707 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:23,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-12-03 17:32:23,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-12-03 17:32:23,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9173, Invalid=15949, Unknown=0, NotChecked=0, Total=25122 [2018-12-03 17:32:23,709 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 81 states. [2018-12-03 17:32:23,952 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 8 [2018-12-03 17:32:24,185 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 9 [2018-12-03 17:32:24,423 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:32:24,657 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:32:24,898 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:32:25,131 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:32:25,374 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:32:25,613 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:32:25,865 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:32:26,114 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:32:26,358 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:32:26,612 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:32:26,854 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:32:27,091 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:32:27,358 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:32:27,607 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:32:27,860 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:32:28,118 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:32:28,396 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:32:28,670 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:32:28,932 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:32:29,190 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:32:29,456 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:32:29,719 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:32:29,974 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:32:30,230 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:32:30,478 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:32:30,734 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:32:30,984 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:32:31,237 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:32:31,497 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:32:40,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:32:40,530 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2018-12-03 17:32:40,530 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 17:32:40,530 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 80 [2018-12-03 17:32:40,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:32:40,531 INFO L225 Difference]: With dead ends: 85 [2018-12-03 17:32:40,531 INFO L226 Difference]: Without dead ends: 83 [2018-12-03 17:32:40,533 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3159 ImplicationChecksByTransitivity, 28.5s TimeCoverageRelationStatistics Valid=21261, Invalid=34199, Unknown=0, NotChecked=0, Total=55460 [2018-12-03 17:32:40,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-12-03 17:32:40,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2018-12-03 17:32:40,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-12-03 17:32:40,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2018-12-03 17:32:40,538 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2018-12-03 17:32:40,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:32:40,538 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2018-12-03 17:32:40,538 INFO L481 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-12-03 17:32:40,538 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2018-12-03 17:32:40,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-12-03 17:32:40,538 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:32:40,538 INFO L402 BasicCegarLoop]: trace histogram [79, 1, 1, 1] [2018-12-03 17:32:40,539 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:32:40,539 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:32:40,539 INFO L82 PathProgramCache]: Analyzing trace with hash -638664440, now seen corresponding path program 40 times [2018-12-03 17:32:40,539 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:32:40,539 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:40,539 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:32:40,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:32:40,540 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:32:40,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:44,436 INFO L134 CoverageAnalysis]: Checked inductivity of 3160 backedges. 0 proven. 3160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:32:44,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:44,437 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:32:44,437 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:32:44,437 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:32:44,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:32:44,437 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:32:44,446 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:32:44,446 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:32:44,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:32:45,108 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:32:45,226 INFO L134 CoverageAnalysis]: Checked inductivity of 3160 backedges. 0 proven. 3160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:32:45,226 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:32:54,508 INFO L134 CoverageAnalysis]: Checked inductivity of 3160 backedges. 0 proven. 3160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:32:54,527 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:32:54,527 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 162 [2018-12-03 17:32:54,527 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:32:54,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 17:32:54,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 17:32:54,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9648, Invalid=16758, Unknown=0, NotChecked=0, Total=26406 [2018-12-03 17:32:54,529 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 83 states. [2018-12-03 17:32:54,781 WARN L180 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 8 [2018-12-03 17:32:55,029 WARN L180 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 9 [2018-12-03 17:32:55,272 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:32:55,522 WARN L180 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:32:55,770 WARN L180 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:32:56,006 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:32:56,255 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:32:56,503 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:32:56,760 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:32:57,010 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:32:57,265 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:32:57,524 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:32:57,792 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:32:58,040 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:32:58,311 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:32:58,575 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:32:58,839 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:32:59,135 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:32:59,420 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:32:59,686 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:32:59,958 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:33:00,236 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:33:00,519 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:33:00,792 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:33:01,072 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:33:01,336 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:33:01,612 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:33:01,884 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:33:02,150 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:33:02,410 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:33:02,677 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:33:02,937 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:33:03,193 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:33:03,454 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:33:04,250 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 17:33:12,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:33:12,325 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2018-12-03 17:33:12,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 17:33:12,325 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 82 [2018-12-03 17:33:12,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:33:12,326 INFO L225 Difference]: With dead ends: 87 [2018-12-03 17:33:12,326 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 17:33:12,328 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 240 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3320 ImplicationChecksByTransitivity, 30.2s TimeCoverageRelationStatistics Valid=22366, Invalid=35956, Unknown=0, NotChecked=0, Total=58322 [2018-12-03 17:33:12,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 17:33:12,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2018-12-03 17:33:12,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-12-03 17:33:12,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2018-12-03 17:33:12,333 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2018-12-03 17:33:12,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:33:12,333 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2018-12-03 17:33:12,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 17:33:12,333 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2018-12-03 17:33:12,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-12-03 17:33:12,334 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:33:12,334 INFO L402 BasicCegarLoop]: trace histogram [81, 1, 1, 1] [2018-12-03 17:33:12,334 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:33:12,334 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:33:12,334 INFO L82 PathProgramCache]: Analyzing trace with hash 423733288, now seen corresponding path program 41 times [2018-12-03 17:33:12,334 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:33:12,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:33:12,335 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:33:12,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:33:12,335 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:33:12,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:33:16,171 INFO L134 CoverageAnalysis]: Checked inductivity of 3321 backedges. 0 proven. 3321 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:33:16,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:33:16,171 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:33:16,172 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:33:16,172 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:33:16,172 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:33:16,172 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:33:16,180 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:33:16,180 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:33:16,239 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-12-03 17:33:16,239 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:33:16,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:33:16,361 INFO L134 CoverageAnalysis]: Checked inductivity of 3321 backedges. 0 proven. 3321 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:33:16,361 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:33:26,030 INFO L134 CoverageAnalysis]: Checked inductivity of 3321 backedges. 0 proven. 3321 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:33:26,049 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:33:26,049 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 165 [2018-12-03 17:33:26,050 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:33:26,050 INFO L459 AbstractCegarLoop]: Interpolant automaton has 85 states [2018-12-03 17:33:26,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2018-12-03 17:33:26,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10131, Invalid=17259, Unknown=0, NotChecked=0, Total=27390 [2018-12-03 17:33:26,051 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 85 states. [2018-12-03 17:33:26,309 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 8 [2018-12-03 17:33:26,554 WARN L180 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 9 [2018-12-03 17:33:26,816 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 17:33:27,071 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 17:33:27,338 WARN L180 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:33:27,597 WARN L180 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:33:27,855 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:33:28,113 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:33:28,380 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:33:28,646 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:33:28,909 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:33:29,197 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:33:29,460 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:33:29,746 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:33:30,035 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:33:30,307 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:33:30,587 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:33:30,863 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:33:31,151 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:33:31,432 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:33:31,715 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:33:31,995 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:33:32,283 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:33:32,565 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:33:32,842 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:33:33,140 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:33:33,417 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:33:33,695 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:33:33,969 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:33:34,240 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:33:34,513 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:33:34,801 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:33:35,076 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:33:35,344 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:33:35,887 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:33:45,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:33:45,054 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2018-12-03 17:33:45,054 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-12-03 17:33:45,054 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 84 [2018-12-03 17:33:45,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:33:45,055 INFO L225 Difference]: With dead ends: 89 [2018-12-03 17:33:45,055 INFO L226 Difference]: Without dead ends: 87 [2018-12-03 17:33:45,057 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3403 ImplicationChecksByTransitivity, 31.6s TimeCoverageRelationStatistics Valid=23415, Invalid=37347, Unknown=0, NotChecked=0, Total=60762 [2018-12-03 17:33:45,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-12-03 17:33:45,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-12-03 17:33:45,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-03 17:33:45,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-12-03 17:33:45,064 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2018-12-03 17:33:45,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:33:45,064 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-12-03 17:33:45,065 INFO L481 AbstractCegarLoop]: Interpolant automaton has 85 states. [2018-12-03 17:33:45,065 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-12-03 17:33:45,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 17:33:45,065 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:33:45,065 INFO L402 BasicCegarLoop]: trace histogram [83, 1, 1, 1] [2018-12-03 17:33:45,065 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:33:45,066 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:33:45,066 INFO L82 PathProgramCache]: Analyzing trace with hash -814266552, now seen corresponding path program 42 times [2018-12-03 17:33:45,066 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:33:45,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:33:45,067 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:33:45,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:33:45,067 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:33:45,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:33:49,098 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 0 proven. 3486 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:33:49,098 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:33:49,098 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:33:49,098 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:33:49,099 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:33:49,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:33:49,099 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:33:49,117 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:33:49,117 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:33:49,609 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:33:49,610 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:33:49,899 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:33:50,020 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 0 proven. 3486 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:33:50,020 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:34:00,225 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 0 proven. 3486 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:34:00,244 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:34:00,245 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 170 [2018-12-03 17:34:00,245 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:34:00,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-12-03 17:34:00,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-12-03 17:34:00,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10634, Invalid=18436, Unknown=0, NotChecked=0, Total=29070 [2018-12-03 17:34:00,246 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 87 states. [2018-12-03 17:34:00,551 WARN L180 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 8 [2018-12-03 17:34:00,832 WARN L180 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 9 [2018-12-03 17:34:01,098 WARN L180 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 17:34:01,371 WARN L180 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 17:34:01,637 WARN L180 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 17:34:01,904 WARN L180 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 17:34:02,177 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:34:02,448 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:34:02,724 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:34:03,009 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:34:03,285 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:34:03,570 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:34:03,848 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:34:04,124 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:34:04,408 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:34:04,689 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:34:04,986 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:34:05,273 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:34:05,573 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:34:05,876 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:34:06,169 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:34:06,466 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:34:06,772 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:34:07,070 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:34:07,365 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:34:07,663 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:34:07,956 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:34:08,247 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:34:08,548 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:34:08,834 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:34:09,128 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:34:09,404 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:34:09,686 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:34:09,970 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:34:10,246 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:34:10,533 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:34:10,833 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:34:11,116 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:34:20,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:34:20,526 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2018-12-03 17:34:20,526 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-12-03 17:34:20,526 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 86 [2018-12-03 17:34:20,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:34:20,527 INFO L225 Difference]: With dead ends: 91 [2018-12-03 17:34:20,528 INFO L226 Difference]: Without dead ends: 89 [2018-12-03 17:34:20,530 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3654 ImplicationChecksByTransitivity, 33.6s TimeCoverageRelationStatistics Valid=24660, Invalid=39602, Unknown=0, NotChecked=0, Total=64262 [2018-12-03 17:34:20,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-12-03 17:34:20,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2018-12-03 17:34:20,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-12-03 17:34:20,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2018-12-03 17:34:20,535 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2018-12-03 17:34:20,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:34:20,535 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2018-12-03 17:34:20,535 INFO L481 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-12-03 17:34:20,535 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2018-12-03 17:34:20,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-12-03 17:34:20,536 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:34:20,536 INFO L402 BasicCegarLoop]: trace histogram [85, 1, 1, 1] [2018-12-03 17:34:20,536 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:34:20,536 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:34:20,536 INFO L82 PathProgramCache]: Analyzing trace with hash -826171800, now seen corresponding path program 43 times [2018-12-03 17:34:20,536 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:34:20,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:34:20,537 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:34:20,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:34:20,537 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:34:20,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:34:24,460 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 0 proven. 3655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:34:24,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:34:24,460 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:34:24,461 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:34:24,461 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:34:24,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:34:24,461 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:34:24,470 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:34:24,470 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:34:24,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:34:25,285 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:34:25,408 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 0 proven. 3655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:34:25,409 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:34:36,014 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 0 proven. 3655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:34:36,033 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:34:36,033 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 174 [2018-12-03 17:34:36,033 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:34:36,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 17:34:36,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 17:34:36,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11145, Invalid=19305, Unknown=0, NotChecked=0, Total=30450 [2018-12-03 17:34:36,035 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 89 states. [2018-12-03 17:34:36,342 WARN L180 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 8 [2018-12-03 17:34:36,640 WARN L180 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 9 [2018-12-03 17:34:36,923 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 17:34:37,210 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 17:34:37,493 WARN L180 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 17:34:37,764 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 17:34:38,051 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 17:34:38,344 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 17:34:38,628 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:34:38,923 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:34:39,208 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:34:39,494 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:34:39,783 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:34:40,078 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:34:40,381 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:34:40,675 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:34:40,976 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:34:41,283 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:34:41,614 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:34:41,934 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:34:42,248 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:34:42,563 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:34:42,868 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:34:43,170 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:34:43,488 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:34:43,801 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:34:44,117 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:34:44,417 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:34:44,711 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:34:45,014 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:34:45,308 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:34:45,606 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:34:45,900 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:34:46,202 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:34:46,513 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:34:46,821 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:34:47,108 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:34:47,395 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:34:47,676 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:34:57,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:34:57,745 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2018-12-03 17:34:57,746 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-12-03 17:34:57,746 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 88 [2018-12-03 17:34:57,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:34:57,747 INFO L225 Difference]: With dead ends: 93 [2018-12-03 17:34:57,747 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 17:34:57,749 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 258 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3827 ImplicationChecksByTransitivity, 35.3s TimeCoverageRelationStatistics Valid=25849, Invalid=41491, Unknown=0, NotChecked=0, Total=67340 [2018-12-03 17:34:57,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 17:34:57,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-12-03 17:34:57,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-12-03 17:34:57,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2018-12-03 17:34:57,755 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2018-12-03 17:34:57,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:34:57,755 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2018-12-03 17:34:57,755 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 17:34:57,755 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2018-12-03 17:34:57,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-12-03 17:34:57,756 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:34:57,756 INFO L402 BasicCegarLoop]: trace histogram [87, 1, 1, 1] [2018-12-03 17:34:57,756 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:34:57,756 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:34:57,756 INFO L82 PathProgramCache]: Analyzing trace with hash 617786760, now seen corresponding path program 44 times [2018-12-03 17:34:57,756 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:34:57,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:34:57,757 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:34:57,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:34:57,757 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:34:58,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:35:01,735 INFO L134 CoverageAnalysis]: Checked inductivity of 3828 backedges. 0 proven. 3828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:35:01,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:35:01,736 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:35:01,736 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:35:01,736 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:35:01,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:35:01,736 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:35:01,746 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:35:01,747 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:35:01,822 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-12-03 17:35:01,822 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:35:01,825 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:35:02,060 INFO L134 CoverageAnalysis]: Checked inductivity of 3828 backedges. 0 proven. 3828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:35:02,060 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:35:12,818 INFO L134 CoverageAnalysis]: Checked inductivity of 3828 backedges. 0 proven. 3828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:35:12,836 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:35:12,837 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 177 [2018-12-03 17:35:12,837 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:35:12,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2018-12-03 17:35:12,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2018-12-03 17:35:12,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11664, Invalid=19842, Unknown=0, NotChecked=0, Total=31506 [2018-12-03 17:35:12,838 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 91 states. [2018-12-03 17:35:13,133 WARN L180 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 8 [2018-12-03 17:35:13,410 WARN L180 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 9 [2018-12-03 17:35:13,697 WARN L180 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 17:35:13,982 WARN L180 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 17:35:14,288 WARN L180 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 17:35:14,566 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 17:35:14,858 WARN L180 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 17:35:15,140 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 17:35:15,434 WARN L180 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 17:35:15,734 WARN L180 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 17:35:16,036 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:35:16,345 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:35:16,638 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:35:16,933 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:35:17,258 WARN L180 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:35:17,584 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:35:17,896 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:35:18,208 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:35:18,519 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:35:18,850 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:35:19,165 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:35:19,495 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:35:19,815 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:35:20,130 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:35:20,449 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:35:20,785 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:35:21,112 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:35:21,440 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:35:21,754 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:35:22,065 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:35:22,409 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:35:22,750 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:35:23,068 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:35:23,384 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:35:23,679 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:35:23,984 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:35:24,283 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:35:24,586 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:35:24,895 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:35:25,182 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:35:25,746 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:35:35,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:35:35,644 INFO L93 Difference]: Finished difference Result 95 states and 96 transitions. [2018-12-03 17:35:35,644 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 17:35:35,645 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 90 [2018-12-03 17:35:35,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:35:35,646 INFO L225 Difference]: With dead ends: 95 [2018-12-03 17:35:35,646 INFO L226 Difference]: Without dead ends: 93 [2018-12-03 17:35:35,648 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 263 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3916 ImplicationChecksByTransitivity, 36.7s TimeCoverageRelationStatistics Valid=26976, Invalid=42984, Unknown=0, NotChecked=0, Total=69960 [2018-12-03 17:35:35,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-12-03 17:35:35,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-12-03 17:35:35,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-12-03 17:35:35,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-12-03 17:35:35,655 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2018-12-03 17:35:35,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:35:35,655 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-12-03 17:35:35,655 INFO L481 AbstractCegarLoop]: Interpolant automaton has 91 states. [2018-12-03 17:35:35,655 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-12-03 17:35:35,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-12-03 17:35:35,656 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:35:35,656 INFO L402 BasicCegarLoop]: trace histogram [89, 1, 1, 1] [2018-12-03 17:35:35,656 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:35:35,656 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:35:35,656 INFO L82 PathProgramCache]: Analyzing trace with hash 987526312, now seen corresponding path program 45 times [2018-12-03 17:35:35,657 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:35:35,657 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:35:35,657 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:35:35,657 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:35:35,658 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:35:36,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:35:40,164 INFO L134 CoverageAnalysis]: Checked inductivity of 4005 backedges. 0 proven. 4005 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:35:40,164 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:35:40,164 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:35:40,164 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:35:40,164 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:35:40,164 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:35:40,165 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:35:40,175 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:35:40,175 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:35:40,753 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:35:40,754 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:35:41,104 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:35:41,233 INFO L134 CoverageAnalysis]: Checked inductivity of 4005 backedges. 0 proven. 4005 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:35:41,233 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:35:52,642 INFO L134 CoverageAnalysis]: Checked inductivity of 4005 backedges. 0 proven. 4005 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:35:52,661 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:35:52,661 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 182 [2018-12-03 17:35:52,661 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:35:52,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2018-12-03 17:35:52,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2018-12-03 17:35:52,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12203, Invalid=21103, Unknown=0, NotChecked=0, Total=33306 [2018-12-03 17:35:52,663 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 93 states. [2018-12-03 17:35:52,979 WARN L180 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 8 [2018-12-03 17:35:53,286 WARN L180 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 9 [2018-12-03 17:35:53,589 WARN L180 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 17:35:53,904 WARN L180 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 17:35:54,219 WARN L180 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 17:35:54,511 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 17:35:54,808 WARN L180 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 17:35:55,119 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 17:35:55,424 WARN L180 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 17:35:55,735 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 17:35:56,058 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 17:35:56,377 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 17:35:56,681 WARN L180 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:35:56,989 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:35:57,309 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:35:57,631 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:35:57,955 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:35:58,313 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:35:58,660 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:35:59,001 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:35:59,336 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:35:59,661 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:35:59,992 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:36:00,335 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:36:00,663 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:36:01,003 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:36:01,332 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:36:01,672 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:36:02,005 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:36:02,330 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:36:02,669 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:36:03,010 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:36:03,352 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:36:03,701 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:36:04,020 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:36:04,345 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:36:04,658 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:36:04,979 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:36:05,293 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:36:05,595 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:36:05,905 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:36:06,204 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:36:17,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:36:17,169 INFO L93 Difference]: Finished difference Result 97 states and 98 transitions. [2018-12-03 17:36:17,169 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-12-03 17:36:17,170 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 92 [2018-12-03 17:36:17,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:36:17,170 INFO L225 Difference]: With dead ends: 97 [2018-12-03 17:36:17,170 INFO L226 Difference]: Without dead ends: 95 [2018-12-03 17:36:17,172 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 270 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4185 ImplicationChecksByTransitivity, 39.3s TimeCoverageRelationStatistics Valid=28311, Invalid=45401, Unknown=0, NotChecked=0, Total=73712 [2018-12-03 17:36:17,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-12-03 17:36:17,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2018-12-03 17:36:17,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-12-03 17:36:17,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2018-12-03 17:36:17,178 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2018-12-03 17:36:17,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:36:17,178 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2018-12-03 17:36:17,178 INFO L481 AbstractCegarLoop]: Interpolant automaton has 93 states. [2018-12-03 17:36:17,178 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2018-12-03 17:36:17,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-12-03 17:36:17,178 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:36:17,179 INFO L402 BasicCegarLoop]: trace histogram [91, 1, 1, 1] [2018-12-03 17:36:17,179 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:36:17,179 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:36:17,179 INFO L82 PathProgramCache]: Analyzing trace with hash -175049784, now seen corresponding path program 46 times [2018-12-03 17:36:17,179 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:36:17,179 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:36:17,180 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:36:17,180 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:36:17,180 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:36:17,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:36:22,060 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:36:22,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:36:22,061 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:36:22,061 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:36:22,061 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:36:22,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:36:22,061 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:36:22,070 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:36:22,071 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:36:22,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:36:23,061 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:36:23,191 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:36:23,192 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:36:35,390 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:36:35,410 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:36:35,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 186 [2018-12-03 17:36:35,410 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:36:35,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 17:36:35,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 17:36:35,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12750, Invalid=22032, Unknown=0, NotChecked=0, Total=34782 [2018-12-03 17:36:35,413 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 95 states. [2018-12-03 17:36:35,731 WARN L180 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 8 [2018-12-03 17:36:36,036 WARN L180 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 9 [2018-12-03 17:36:36,354 WARN L180 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 17:36:36,693 WARN L180 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 17:36:37,007 WARN L180 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 17:36:37,316 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 17:36:37,622 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 17:36:37,939 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 17:36:38,258 WARN L180 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 17:36:38,585 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 17:36:38,911 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 17:36:39,259 WARN L180 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 17:36:39,595 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 17:36:39,922 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 17:36:40,252 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:36:40,583 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:36:40,918 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:36:41,291 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:36:41,634 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:36:41,973 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:36:42,323 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:36:42,660 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:36:43,003 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:36:43,347 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:36:43,700 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:36:44,050 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:36:44,414 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:36:44,802 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:36:45,147 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:36:45,483 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:36:45,837 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:36:46,179 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:36:46,520 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:36:46,872 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:36:47,210 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:36:47,555 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:36:47,885 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:36:48,227 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:36:48,550 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:36:48,858 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:36:49,171 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:36:49,524 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:36:49,841 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:36:50,153 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:36:50,779 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:37:01,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:37:01,322 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-12-03 17:37:01,322 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 17:37:01,323 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 94 [2018-12-03 17:37:01,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:37:01,324 INFO L225 Difference]: With dead ends: 99 [2018-12-03 17:37:01,324 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 17:37:01,325 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 276 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4370 ImplicationChecksByTransitivity, 41.9s TimeCoverageRelationStatistics Valid=29584, Invalid=47422, Unknown=0, NotChecked=0, Total=77006 [2018-12-03 17:37:01,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 17:37:01,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-12-03 17:37:01,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-12-03 17:37:01,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2018-12-03 17:37:01,331 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2018-12-03 17:37:01,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:37:01,331 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2018-12-03 17:37:01,331 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 17:37:01,331 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2018-12-03 17:37:01,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-12-03 17:37:01,332 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:37:01,332 INFO L402 BasicCegarLoop]: trace histogram [93, 1, 1, 1] [2018-12-03 17:37:01,332 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:37:01,332 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:37:01,332 INFO L82 PathProgramCache]: Analyzing trace with hash -719181080, now seen corresponding path program 47 times [2018-12-03 17:37:01,332 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:37:01,333 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:37:01,333 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:37:01,333 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:37:01,333 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:37:01,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:37:06,247 INFO L134 CoverageAnalysis]: Checked inductivity of 4371 backedges. 0 proven. 4371 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:37:06,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:37:06,247 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:37:06,248 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:37:06,248 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:37:06,248 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:37:06,248 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:37:06,257 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:37:06,257 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:37:06,325 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-12-03 17:37:06,326 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:37:06,330 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:37:06,564 INFO L134 CoverageAnalysis]: Checked inductivity of 4371 backedges. 0 proven. 4371 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:37:06,564 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:37:18,725 INFO L134 CoverageAnalysis]: Checked inductivity of 4371 backedges. 0 proven. 4371 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:37:18,744 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:37:18,744 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 189 [2018-12-03 17:37:18,744 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:37:18,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 97 states [2018-12-03 17:37:18,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2018-12-03 17:37:18,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13305, Invalid=22605, Unknown=0, NotChecked=0, Total=35910 [2018-12-03 17:37:18,746 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 97 states. [2018-12-03 17:37:19,062 WARN L180 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 8 [2018-12-03 17:37:19,373 WARN L180 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 9 [2018-12-03 17:37:19,695 WARN L180 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 17:37:20,025 WARN L180 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 17:37:20,376 WARN L180 SmtUtils]: Spent 302.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 17:37:20,695 WARN L180 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 17:37:21,019 WARN L180 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 17:37:21,343 WARN L180 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 17:37:21,672 WARN L180 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 17:37:22,017 WARN L180 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 17:37:22,346 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 17:37:22,730 WARN L180 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 17:37:23,058 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 17:37:23,383 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 17:37:23,732 WARN L180 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 17:37:24,087 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 17:37:24,422 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:37:24,768 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:37:25,113 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:37:25,487 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:37:25,850 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:37:26,206 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:37:26,565 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:37:26,922 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:37:27,275 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:37:27,655 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:37:28,022 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:37:28,384 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:37:28,747 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:37:29,095 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:37:29,454 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:37:29,803 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:37:30,158 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:37:30,554 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:37:30,900 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:37:31,260 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:37:31,613 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:37:31,961 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:37:32,309 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:37:32,632 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:37:32,969 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:37:33,293 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:37:33,626 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:37:33,951 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:37:34,594 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:37:34,915 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:37:35,240 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:37:35,605 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 17:37:46,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:37:46,208 INFO L93 Difference]: Finished difference Result 101 states and 102 transitions. [2018-12-03 17:37:46,209 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-12-03 17:37:46,209 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 96 [2018-12-03 17:37:46,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:37:46,210 INFO L225 Difference]: With dead ends: 101 [2018-12-03 17:37:46,210 INFO L226 Difference]: Without dead ends: 99 [2018-12-03 17:37:46,213 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 281 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4465 ImplicationChecksByTransitivity, 43.6s TimeCoverageRelationStatistics Valid=30789, Invalid=49017, Unknown=0, NotChecked=0, Total=79806 [2018-12-03 17:37:46,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-12-03 17:37:46,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-12-03 17:37:46,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-12-03 17:37:46,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-12-03 17:37:46,218 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2018-12-03 17:37:46,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:37:46,219 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-12-03 17:37:46,219 INFO L481 AbstractCegarLoop]: Interpolant automaton has 97 states. [2018-12-03 17:37:46,219 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-12-03 17:37:46,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-12-03 17:37:46,219 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:37:46,219 INFO L402 BasicCegarLoop]: trace histogram [95, 1, 1, 1] [2018-12-03 17:37:46,219 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:37:46,219 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:37:46,220 INFO L82 PathProgramCache]: Analyzing trace with hash 356653576, now seen corresponding path program 48 times [2018-12-03 17:37:46,220 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:37:46,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:37:46,220 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:37:46,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:37:46,221 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:37:46,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:37:52,241 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 0 proven. 4560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:37:52,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:37:52,241 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:37:52,241 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:37:52,241 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:37:52,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:37:52,241 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:37:52,249 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:37:52,249 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:37:52,947 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:37:52,947 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:37:53,374 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:37:54,640 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 0 proven. 4560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:37:54,641 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:38:08,004 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 0 proven. 4560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:38:08,024 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:38:08,024 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 194 [2018-12-03 17:38:08,024 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:38:08,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-12-03 17:38:08,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-12-03 17:38:08,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13880, Invalid=23950, Unknown=0, NotChecked=0, Total=37830 [2018-12-03 17:38:08,026 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 99 states. [2018-12-03 17:38:08,365 WARN L180 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 8 [2018-12-03 17:38:08,683 WARN L180 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 9 [2018-12-03 17:38:09,024 WARN L180 SmtUtils]: Spent 312.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2018-12-03 17:38:09,353 WARN L180 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2018-12-03 17:38:09,685 WARN L180 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 17:38:10,011 WARN L180 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 17:38:10,348 WARN L180 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 17:38:10,688 WARN L180 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 17:38:11,032 WARN L180 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 17:38:11,392 WARN L180 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 17:38:11,756 WARN L180 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 17:38:12,102 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 17:38:12,438 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 17:38:12,774 WARN L180 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 17:38:13,134 WARN L180 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 17:38:13,496 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 17:38:13,851 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 17:38:14,212 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 17:38:14,567 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:38:14,943 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:38:15,302 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:38:15,662 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:38:16,037 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:38:16,422 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:38:16,820 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:38:17,196 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:38:17,573 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:38:17,938 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:38:18,315 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:38:18,688 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:38:19,055 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:38:19,417 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:38:19,790 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:38:20,163 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:38:20,541 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:38:20,909 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:38:21,272 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:38:21,679 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:38:22,033 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:38:22,379 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:38:22,729 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:38:23,063 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:38:23,390 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:38:23,722 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:38:24,056 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:38:24,387 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:38:24,725 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:38:25,056 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 17:38:25,387 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 17:38:25,733 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 17:38:26,758 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 17:38:36,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:38:36,738 INFO L93 Difference]: Finished difference Result 103 states and 104 transitions. [2018-12-03 17:38:36,739 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 17:38:36,739 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 98 [2018-12-03 17:38:36,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:38:36,740 INFO L225 Difference]: With dead ends: 103 [2018-12-03 17:38:36,740 INFO L226 Difference]: Without dead ends: 101 [2018-12-03 17:38:36,742 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 288 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4752 ImplicationChecksByTransitivity, 48.1s TimeCoverageRelationStatistics Valid=32214, Invalid=51596, Unknown=0, NotChecked=0, Total=83810 [2018-12-03 17:38:36,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2018-12-03 17:38:36,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2018-12-03 17:38:36,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-12-03 17:38:36,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2018-12-03 17:38:36,748 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2018-12-03 17:38:36,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:38:36,749 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2018-12-03 17:38:36,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-12-03 17:38:36,749 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2018-12-03 17:38:36,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-12-03 17:38:36,750 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:38:36,750 INFO L402 BasicCegarLoop]: trace histogram [97, 1, 1, 1] [2018-12-03 17:38:36,750 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:38:36,750 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:38:36,750 INFO L82 PathProgramCache]: Analyzing trace with hash -853360344, now seen corresponding path program 49 times [2018-12-03 17:38:36,750 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:38:36,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:38:36,751 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:38:36,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:38:36,751 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:38:37,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:38:42,815 INFO L134 CoverageAnalysis]: Checked inductivity of 4753 backedges. 0 proven. 4753 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:38:42,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:38:42,816 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:38:42,816 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:38:42,816 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:38:42,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:38:42,816 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:38:42,824 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:38:42,825 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:38:43,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:38:44,124 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:38:44,256 INFO L134 CoverageAnalysis]: Checked inductivity of 4753 backedges. 0 proven. 4753 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:38:44,256 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:38:58,143 INFO L134 CoverageAnalysis]: Checked inductivity of 4753 backedges. 0 proven. 4753 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:38:58,162 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:38:58,162 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 198 [2018-12-03 17:38:58,162 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:38:58,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 17:38:58,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 17:38:58,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14463, Invalid=24939, Unknown=0, NotChecked=0, Total=39402 [2018-12-03 17:38:58,165 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 101 states. [2018-12-03 17:38:58,507 WARN L180 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 8 [2018-12-03 17:38:58,836 WARN L180 SmtUtils]: Spent 304.00 ms on a formula simplification. DAG size of input: 297 DAG size of output: 9 [2018-12-03 17:38:59,170 WARN L180 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2018-12-03 17:38:59,511 WARN L180 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2018-12-03 17:38:59,877 WARN L180 SmtUtils]: Spent 317.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2018-12-03 17:39:00,213 WARN L180 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2018-12-03 17:39:00,547 WARN L180 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 17:39:00,897 WARN L180 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 17:39:01,255 WARN L180 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 17:39:01,628 WARN L180 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 17:39:01,988 WARN L180 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 17:39:02,342 WARN L180 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 17:39:02,709 WARN L180 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 17:39:03,070 WARN L180 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 17:39:03,441 WARN L180 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 17:39:03,824 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 17:39:04,182 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 17:39:04,570 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 17:39:04,938 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 17:39:05,307 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 17:39:05,701 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 17:39:06,094 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 17:39:06,475 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 17:39:06,867 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 17:39:07,256 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 17:39:07,643 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 17:39:08,043 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 17:39:08,437 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 17:39:08,823 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 17:39:09,210 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 17:39:09,591 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 17:39:09,970 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 17:39:10,357 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 17:39:10,736 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 17:39:11,127 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 17:39:11,512 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 17:39:11,882 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 17:39:12,261 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 17:39:12,642 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 17:39:13,008 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 17:39:13,375 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 17:39:13,731 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 17:39:14,104 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 17:39:14,452 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 17:39:14,795 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 17:39:15,142 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 17:39:15,495 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 17:39:15,841 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 17:39:16,184 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 17:39:16,879 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11