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_exp_cong.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/count_by_k.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 16:28:50,924 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 16:28:50,926 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 16:28:50,938 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 16:28:50,938 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 16:28:50,939 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 16:28:50,940 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 16:28:50,942 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 16:28:50,944 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 16:28:50,944 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 16:28:50,945 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-12-03 16:28:50,977 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_exp_cong.epf [2018-12-03 16:28:51,007 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 16:28:51,008 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 16:28:51,009 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 16:28:51,010 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 16:28:51,010 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 16:28:51,010 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 16:28:51,010 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 16:28:51,010 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 16:28:51,011 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-03 16:28:51,011 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 16:28:51,011 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-03 16:28:51,011 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 16:28:51,012 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 16:28:51,012 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 16:28:51,012 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 16:28:51,013 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 16:28:51,013 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 16:28:51,013 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 16:28:51,013 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 16:28:51,013 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 16:28:51,014 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 16:28:51,015 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 16:28:51,015 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 16:28:51,016 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 16:28:51,016 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 16:28:51,016 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 16:28:51,016 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 16:28:51,017 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 16:28:51,017 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 16:28:51,017 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 16:28:51,017 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 16:28:51,017 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 16:28:51,017 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 16:28:51,019 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 16:28:51,019 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 16:28:51,019 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 16:28:51,019 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 16:28:51,019 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 16:28:51,020 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 16:28:51,020 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 16:28:51,020 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 16:28:51,066 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 16:28:51,078 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 16:28:51,082 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 16:28:51,084 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 16:28:51,085 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 16:28:51,086 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/count_by_k.i_3.bpl [2018-12-03 16:28:51,086 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/count_by_k.i_3.bpl' [2018-12-03 16:28:51,116 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 16:28:51,117 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 16:28:51,118 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 16:28:51,118 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 16:28:51,118 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 16:28:51,134 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:28:51" (1/1) ... [2018-12-03 16:28:51,142 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:28:51" (1/1) ... [2018-12-03 16:28:51,150 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 16:28:51,151 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 16:28:51,151 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 16:28:51,151 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 16:28:51,162 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:28:51" (1/1) ... [2018-12-03 16:28:51,163 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:28:51" (1/1) ... [2018-12-03 16:28:51,163 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:28:51" (1/1) ... [2018-12-03 16:28:51,164 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:28:51" (1/1) ... [2018-12-03 16:28:51,167 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:28:51" (1/1) ... [2018-12-03 16:28:51,169 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:28:51" (1/1) ... [2018-12-03 16:28:51,170 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:28:51" (1/1) ... [2018-12-03 16:28:51,171 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 16:28:51,172 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 16:28:51,172 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 16:28:51,172 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 16:28:51,173 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:28:51" (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 16:28:51,244 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 16:28:51,244 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 16:28:51,468 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 16:28:51,468 INFO L280 CfgBuilder]: Removed 1 assue(true) statements. [2018-12-03 16:28:51,469 INFO L202 PluginConnector]: Adding new model count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 04:28:51 BoogieIcfgContainer [2018-12-03 16:28:51,469 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 16:28:51,470 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 16:28:51,470 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 16:28:51,473 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 16:28:51,474 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:28:51" (1/2) ... [2018-12-03 16:28:51,475 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a4d7e7e and model type count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 04:28:51, skipping insertion in model container [2018-12-03 16:28:51,475 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 04:28:51" (2/2) ... [2018-12-03 16:28:51,477 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k.i_3.bpl [2018-12-03 16:28:51,488 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 16:28:51,497 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 16:28:51,515 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 16:28:51,551 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 16:28:51,551 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 16:28:51,551 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 16:28:51,551 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 16:28:51,552 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 16:28:51,552 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 16:28:51,552 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 16:28:51,552 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 16:28:51,568 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-12-03 16:28:51,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-12-03 16:28:51,575 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:28:51,576 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-12-03 16:28:51,578 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:28:51,584 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:28:51,584 INFO L82 PathProgramCache]: Analyzing trace with hash 29955, now seen corresponding path program 1 times [2018-12-03 16:28:51,587 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:28:51,644 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:51,644 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:28:51,644 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:51,644 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:28:51,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:28:51,804 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 16:28:51,806 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:28:51,806 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-03 16:28:51,806 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:28:51,812 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 16:28:51,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 16:28:51,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 16:28:51,826 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-12-03 16:28:51,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:28:51,879 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2018-12-03 16:28:51,880 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 16:28:51,881 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-12-03 16:28:51,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:28:51,892 INFO L225 Difference]: With dead ends: 9 [2018-12-03 16:28:51,893 INFO L226 Difference]: Without dead ends: 5 [2018-12-03 16:28:51,896 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 16:28:51,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states. [2018-12-03 16:28:51,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2018-12-03 16:28:51,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2018-12-03 16:28:51,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 5 transitions. [2018-12-03 16:28:51,934 INFO L78 Accepts]: Start accepts. Automaton has 5 states and 5 transitions. Word has length 3 [2018-12-03 16:28:51,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:28:51,934 INFO L480 AbstractCegarLoop]: Abstraction has 5 states and 5 transitions. [2018-12-03 16:28:51,934 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 16:28:51,935 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 5 transitions. [2018-12-03 16:28:51,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-03 16:28:51,935 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:28:51,935 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-12-03 16:28:51,936 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:28:51,936 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:28:51,936 INFO L82 PathProgramCache]: Analyzing trace with hash 930412, now seen corresponding path program 1 times [2018-12-03 16:28:51,936 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:28:51,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:51,937 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:28:51,940 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:51,940 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:28:51,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:28:52,069 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 16:28:52,069 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:28:52,069 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:28:52,070 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 5 with the following transitions: [2018-12-03 16:28:52,072 INFO L205 CegarAbsIntRunner]: [0], [5], [7], [9] [2018-12-03 16:28:52,141 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:28:52,142 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:28:52,434 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:28:52,436 INFO L272 AbstractInterpreter]: Visited 4 different actions 10 times. Merged at 3 different actions 6 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 16:28:52,467 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:28:52,468 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:28:52,468 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:28:52,469 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 16:28:52,485 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:28:52,485 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:28:52,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:28:52,519 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:28:52,567 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 16:28:52,568 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:28:52,641 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 16:28:52,661 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:28:52,661 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2018-12-03 16:28:52,661 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:28:52,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 16:28:52,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 16:28:52,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-03 16:28:52,664 INFO L87 Difference]: Start difference. First operand 5 states and 5 transitions. Second operand 5 states. [2018-12-03 16:28:52,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:28:52,690 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2018-12-03 16:28:52,691 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 16:28:52,691 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 4 [2018-12-03 16:28:52,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:28:52,692 INFO L225 Difference]: With dead ends: 9 [2018-12-03 16:28:52,692 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 16:28:52,693 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-03 16:28:52,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 16:28:52,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-12-03 16:28:52,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 16:28:52,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-12-03 16:28:52,697 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-12-03 16:28:52,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:28:52,697 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-12-03 16:28:52,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 16:28:52,697 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-12-03 16:28:52,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 16:28:52,698 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:28:52,698 INFO L402 BasicCegarLoop]: trace histogram [3, 1, 1, 1] [2018-12-03 16:28:52,699 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:28:52,699 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:28:52,699 INFO L82 PathProgramCache]: Analyzing trace with hash 894183756, now seen corresponding path program 2 times [2018-12-03 16:28:52,699 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:28:52,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:52,701 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:28:52,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:52,701 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:28:52,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:28:52,808 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 16:28:52,809 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:28:52,809 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:28:52,809 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:28:52,810 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:28:52,810 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:28:52,810 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 16:28:52,821 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:28:52,821 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:28:52,872 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-03 16:28:52,872 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:28:52,874 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:28:52,944 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 16:28:52,945 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:28:53,414 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 16:28:53,433 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:28:53,433 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-12-03 16:28:53,433 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:28:53,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:28:53,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:28:53,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2018-12-03 16:28:53,435 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 7 states. [2018-12-03 16:28:53,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:28:53,634 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-12-03 16:28:53,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 16:28:53,635 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 6 [2018-12-03 16:28:53,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:28:53,636 INFO L225 Difference]: With dead ends: 11 [2018-12-03 16:28:53,636 INFO L226 Difference]: Without dead ends: 9 [2018-12-03 16:28:53,637 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 16:28:53,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-12-03 16:28:53,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-12-03 16:28:53,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-12-03 16:28:53,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-12-03 16:28:53,644 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-12-03 16:28:53,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:28:53,645 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-12-03 16:28:53,645 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:28:53,645 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-12-03 16:28:53,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-03 16:28:53,646 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:28:53,646 INFO L402 BasicCegarLoop]: trace histogram [5, 1, 1, 1] [2018-12-03 16:28:53,647 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:28:53,647 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:28:53,647 INFO L82 PathProgramCache]: Analyzing trace with hash 317188140, now seen corresponding path program 3 times [2018-12-03 16:28:53,647 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:28:53,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:53,653 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:28:53,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:53,653 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:28:53,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:28:53,925 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 16:28:53,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:28:53,926 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:28:53,926 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:28:53,927 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:28:53,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:28:53,927 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 16:28:53,937 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:28:53,937 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:28:53,955 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:28:53,956 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:28:53,957 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:28:54,007 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 16:28:54,008 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:28:54,502 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 16:28:54,531 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:28:54,532 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-12-03 16:28:54,532 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:28:54,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-03 16:28:54,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-03 16:28:54,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-12-03 16:28:54,534 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 9 states. [2018-12-03 16:28:54,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:28:54,753 INFO L93 Difference]: Finished difference Result 13 states and 14 transitions. [2018-12-03 16:28:54,753 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 16:28:54,754 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 8 [2018-12-03 16:28:54,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:28:54,754 INFO L225 Difference]: With dead ends: 13 [2018-12-03 16:28:54,754 INFO L226 Difference]: Without dead ends: 11 [2018-12-03 16:28:54,755 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=121, Invalid=221, Unknown=0, NotChecked=0, Total=342 [2018-12-03 16:28:54,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-12-03 16:28:54,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-12-03 16:28:54,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-12-03 16:28:54,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-12-03 16:28:54,760 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-12-03 16:28:54,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:28:54,760 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-12-03 16:28:54,760 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-03 16:28:54,760 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-12-03 16:28:54,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 16:28:54,761 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:28:54,761 INFO L402 BasicCegarLoop]: trace histogram [7, 1, 1, 1] [2018-12-03 16:28:54,761 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:28:54,762 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:28:54,762 INFO L82 PathProgramCache]: Analyzing trace with hash -124817652, now seen corresponding path program 4 times [2018-12-03 16:28:54,762 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:28:54,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:54,763 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:28:54,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:54,763 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:28:54,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:28:54,899 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 16:28:54,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:28:54,900 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:28:54,900 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:28:54,901 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:28:54,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:28:54,901 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 16:28:54,911 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:28:54,911 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:28:54,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:28:54,921 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:28:54,964 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 16:28:54,964 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:28:55,219 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 16:28:55,239 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:28:55,239 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2018-12-03 16:28:55,239 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:28:55,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 16:28:55,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 16:28:55,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2018-12-03 16:28:55,241 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 11 states. [2018-12-03 16:28:55,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:28:55,523 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2018-12-03 16:28:55,523 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 16:28:55,523 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 10 [2018-12-03 16:28:55,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:28:55,524 INFO L225 Difference]: With dead ends: 15 [2018-12-03 16:28:55,524 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 16:28:55,525 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=216, Invalid=384, Unknown=0, NotChecked=0, Total=600 [2018-12-03 16:28:55,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 16:28:55,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-12-03 16:28:55,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-12-03 16:28:55,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-12-03 16:28:55,529 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-12-03 16:28:55,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:28:55,530 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-12-03 16:28:55,530 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 16:28:55,530 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-12-03 16:28:55,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 16:28:55,531 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:28:55,531 INFO L402 BasicCegarLoop]: trace histogram [9, 1, 1, 1] [2018-12-03 16:28:55,531 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:28:55,531 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:28:55,531 INFO L82 PathProgramCache]: Analyzing trace with hash 309378540, now seen corresponding path program 5 times [2018-12-03 16:28:55,532 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:28:55,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:55,533 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:28:55,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:55,533 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:28:55,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:28:55,921 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 16:28:55,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:28:55,922 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:28:55,922 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:28:55,922 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:28:55,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:28:55,922 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 16:28:55,934 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:28:55,934 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:28:55,957 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-03 16:28:55,957 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:28:55,959 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:28:56,005 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 16:28:56,005 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:28:56,316 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 16:28:56,335 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:28:56,335 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-12-03 16:28:56,335 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:28:56,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 16:28:56,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 16:28:56,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=303, Unknown=0, NotChecked=0, Total=462 [2018-12-03 16:28:56,337 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 13 states. [2018-12-03 16:28:56,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:28:56,686 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2018-12-03 16:28:56,690 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 16:28:56,690 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 12 [2018-12-03 16:28:56,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:28:56,691 INFO L225 Difference]: With dead ends: 17 [2018-12-03 16:28:56,691 INFO L226 Difference]: Without dead ends: 15 [2018-12-03 16:28:56,692 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=339, Invalid=591, Unknown=0, NotChecked=0, Total=930 [2018-12-03 16:28:56,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-12-03 16:28:56,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-12-03 16:28:56,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-03 16:28:56,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-12-03 16:28:56,696 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-12-03 16:28:56,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:28:56,697 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-12-03 16:28:56,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 16:28:56,697 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-12-03 16:28:56,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-03 16:28:56,697 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:28:56,698 INFO L402 BasicCegarLoop]: trace histogram [11, 1, 1, 1] [2018-12-03 16:28:56,698 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:28:56,698 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:28:56,698 INFO L82 PathProgramCache]: Analyzing trace with hash 960091340, now seen corresponding path program 6 times [2018-12-03 16:28:56,698 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:28:56,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:56,699 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:28:56,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:56,699 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:28:56,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:28:56,932 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 16:28:56,933 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:28:56,933 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:28:56,933 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:28:56,933 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:28:56,934 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:28:56,934 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 16:28:56,950 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:28:56,950 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:28:56,983 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:28:56,983 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:28:56,987 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:28:57,258 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 16:28:57,259 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:28:57,666 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 16:28:57,685 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:28:57,685 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-12-03 16:28:57,686 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:28:57,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 16:28:57,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 16:28:57,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:28:57,688 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 15 states. [2018-12-03 16:28:58,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:28:58,180 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2018-12-03 16:28:58,182 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 16:28:58,182 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 14 [2018-12-03 16:28:58,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:28:58,183 INFO L225 Difference]: With dead ends: 19 [2018-12-03 16:28:58,183 INFO L226 Difference]: Without dead ends: 17 [2018-12-03 16:28:58,185 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=490, Invalid=842, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 16:28:58,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-12-03 16:28:58,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-12-03 16:28:58,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-12-03 16:28:58,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-12-03 16:28:58,189 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-12-03 16:28:58,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:28:58,190 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-12-03 16:28:58,190 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 16:28:58,190 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-12-03 16:28:58,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 16:28:58,190 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:28:58,191 INFO L402 BasicCegarLoop]: trace histogram [13, 1, 1, 1] [2018-12-03 16:28:58,191 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:28:58,191 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:28:58,191 INFO L82 PathProgramCache]: Analyzing trace with hash -770133076, now seen corresponding path program 7 times [2018-12-03 16:28:58,191 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:28:58,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:58,193 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:28:58,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:58,193 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:28:58,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:28:58,648 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 16:28:58,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:28:58,648 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:28:58,648 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:28:58,649 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:28:58,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:28:58,649 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 16:28:58,658 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:28:58,659 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:28:58,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:28:58,686 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:28:58,737 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 16:28:58,738 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:28:59,459 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 16:28:59,477 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:28:59,478 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2018-12-03 16:28:59,478 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:28:59,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 16:28:59,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 16:28:59,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=565, Unknown=0, NotChecked=0, Total=870 [2018-12-03 16:28:59,480 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 17 states. [2018-12-03 16:28:59,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:28:59,968 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2018-12-03 16:28:59,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 16:28:59,968 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 16 [2018-12-03 16:28:59,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:28:59,969 INFO L225 Difference]: With dead ends: 21 [2018-12-03 16:28:59,969 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 16:28:59,970 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=669, Invalid=1137, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 16:28:59,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 16:28:59,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-12-03 16:28:59,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 16:28:59,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-12-03 16:28:59,975 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-12-03 16:28:59,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:28:59,976 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-12-03 16:28:59,976 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 16:28:59,976 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-12-03 16:28:59,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 16:28:59,977 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:28:59,977 INFO L402 BasicCegarLoop]: trace histogram [15, 1, 1, 1] [2018-12-03 16:28:59,977 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:28:59,977 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:28:59,977 INFO L82 PathProgramCache]: Analyzing trace with hash -1363453300, now seen corresponding path program 8 times [2018-12-03 16:28:59,978 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:28:59,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:59,978 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:28:59,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:28:59,979 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:28:59,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:00,274 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 16:29:00,274 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:00,275 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:29:00,275 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:29:00,275 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:29:00,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:00,275 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 16:29:00,284 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:29:00,285 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:29:00,304 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-03 16:29:00,304 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:29:00,307 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:29:00,348 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 16:29:00,349 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:29:01,239 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 16:29:01,258 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:29:01,258 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-12-03 16:29:01,258 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:29:01,259 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 16:29:01,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 16:29:01,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=396, Invalid=726, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 16:29:01,260 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 19 states. [2018-12-03 16:29:01,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:29:01,997 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2018-12-03 16:29:01,997 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 16:29:01,997 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 18 [2018-12-03 16:29:01,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:29:01,998 INFO L225 Difference]: With dead ends: 23 [2018-12-03 16:29:01,998 INFO L226 Difference]: Without dead ends: 21 [2018-12-03 16:29:02,000 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=876, Invalid=1476, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 16:29:02,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-12-03 16:29:02,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-12-03 16:29:02,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 16:29:02,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-12-03 16:29:02,005 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-12-03 16:29:02,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:29:02,006 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-12-03 16:29:02,006 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 16:29:02,006 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-12-03 16:29:02,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 16:29:02,007 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:29:02,007 INFO L402 BasicCegarLoop]: trace histogram [17, 1, 1, 1] [2018-12-03 16:29:02,007 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:29:02,007 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:29:02,007 INFO L82 PathProgramCache]: Analyzing trace with hash -313538196, now seen corresponding path program 9 times [2018-12-03 16:29:02,007 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:29:02,008 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:02,008 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:29:02,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:02,009 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:29:02,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:02,315 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 16:29:02,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:02,315 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:29:02,315 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:29:02,316 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:29:02,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:02,316 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 16:29:02,325 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:29:02,325 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:29:02,345 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:29:02,345 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:29:02,350 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:29:02,486 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 16:29:02,486 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:29:03,205 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 16:29:03,225 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:29:03,225 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-12-03 16:29:03,225 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:29:03,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 16:29:03,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 16:29:03,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=499, Invalid=907, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 16:29:03,227 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 21 states. [2018-12-03 16:29:03,577 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 11 [2018-12-03 16:29:03,942 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 11 [2018-12-03 16:29:04,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:29:04,550 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-12-03 16:29:04,551 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 16:29:04,551 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 20 [2018-12-03 16:29:04,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:29:04,552 INFO L225 Difference]: With dead ends: 25 [2018-12-03 16:29:04,552 INFO L226 Difference]: Without dead ends: 23 [2018-12-03 16:29:04,553 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1111, Invalid=1859, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 16:29:04,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-12-03 16:29:04,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-12-03 16:29:04,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-12-03 16:29:04,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-12-03 16:29:04,558 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-12-03 16:29:04,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:29:04,558 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-12-03 16:29:04,558 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 16:29:04,558 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-12-03 16:29:04,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-12-03 16:29:04,559 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:29:04,559 INFO L402 BasicCegarLoop]: trace histogram [19, 1, 1, 1] [2018-12-03 16:29:04,559 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:29:04,560 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:29:04,560 INFO L82 PathProgramCache]: Analyzing trace with hash -662437812, now seen corresponding path program 10 times [2018-12-03 16:29:04,560 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:29:04,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:04,561 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:29:04,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:04,561 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:29:04,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:04,983 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 16:29:04,984 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:04,984 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:29:04,984 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:29:04,984 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:29:04,984 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:04,984 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 16:29:04,993 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:29:04,994 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:29:05,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:05,019 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:29:05,053 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 16:29:05,053 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:29:05,680 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 16:29:05,708 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:29:05,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2018-12-03 16:29:05,708 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:29:05,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 16:29:05,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 16:29:05,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=614, Invalid=1108, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 16:29:05,710 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 23 states. [2018-12-03 16:29:06,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:29:06,516 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2018-12-03 16:29:06,517 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 16:29:06,517 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 22 [2018-12-03 16:29:06,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:29:06,518 INFO L225 Difference]: With dead ends: 27 [2018-12-03 16:29:06,518 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 16:29:06,519 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1374, Invalid=2286, Unknown=0, NotChecked=0, Total=3660 [2018-12-03 16:29:06,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 16:29:06,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-12-03 16:29:06,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-03 16:29:06,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-12-03 16:29:06,524 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-12-03 16:29:06,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:29:06,524 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-12-03 16:29:06,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 16:29:06,524 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-12-03 16:29:06,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 16:29:06,524 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:29:06,525 INFO L402 BasicCegarLoop]: trace histogram [21, 1, 1, 1] [2018-12-03 16:29:06,525 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:29:06,525 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:29:06,525 INFO L82 PathProgramCache]: Analyzing trace with hash -947519700, now seen corresponding path program 11 times [2018-12-03 16:29:06,525 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:29:06,526 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:06,526 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:29:06,526 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:06,526 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:29:06,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:06,833 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 16:29:06,834 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:06,834 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:29:06,834 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:29:06,834 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:29:06,834 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:06,834 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 16:29:06,855 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:29:06,856 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:29:06,878 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-03 16:29:06,878 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:29:06,881 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:29:06,939 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 16:29:06,939 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:29:08,293 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 16:29:08,312 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:29:08,313 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-12-03 16:29:08,313 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:29:08,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-03 16:29:08,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-03 16:29:08,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=1329, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 16:29:08,314 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 25 states. [2018-12-03 16:29:09,806 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 11 [2018-12-03 16:29:10,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:29:10,058 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2018-12-03 16:29:10,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 16:29:10,060 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 24 [2018-12-03 16:29:10,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:29:10,061 INFO L225 Difference]: With dead ends: 29 [2018-12-03 16:29:10,061 INFO L226 Difference]: Without dead ends: 27 [2018-12-03 16:29:10,063 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1665, Invalid=2757, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 16:29:10,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-12-03 16:29:10,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-12-03 16:29:10,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-03 16:29:10,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-12-03 16:29:10,068 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-12-03 16:29:10,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:29:10,068 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-12-03 16:29:10,068 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-03 16:29:10,068 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-12-03 16:29:10,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-03 16:29:10,069 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:29:10,069 INFO L402 BasicCegarLoop]: trace histogram [23, 1, 1, 1] [2018-12-03 16:29:10,069 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:29:10,070 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:29:10,070 INFO L82 PathProgramCache]: Analyzing trace with hash -33307124, now seen corresponding path program 12 times [2018-12-03 16:29:10,070 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:29:10,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:10,071 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:29:10,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:10,071 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:29:10,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:10,481 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 16:29:10,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:10,481 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:29:10,481 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:29:10,481 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:29:10,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:10,482 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 16:29:10,492 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:29:10,492 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:29:10,543 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:29:10,543 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:29:10,556 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:29:10,763 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 16:29:10,763 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:29:11,636 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 16:29:11,654 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:29:11,655 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-12-03 16:29:11,655 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:29:11,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 16:29:11,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 16:29:11,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=880, Invalid=1570, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 16:29:11,656 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 27 states. [2018-12-03 16:29:13,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:29:13,094 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-12-03 16:29:13,094 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 16:29:13,094 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 26 [2018-12-03 16:29:13,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:29:13,095 INFO L225 Difference]: With dead ends: 31 [2018-12-03 16:29:13,095 INFO L226 Difference]: Without dead ends: 29 [2018-12-03 16:29:13,098 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1984, Invalid=3272, Unknown=0, NotChecked=0, Total=5256 [2018-12-03 16:29:13,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-12-03 16:29:13,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-12-03 16:29:13,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-12-03 16:29:13,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-12-03 16:29:13,103 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-12-03 16:29:13,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:29:13,103 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-12-03 16:29:13,103 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 16:29:13,104 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-12-03 16:29:13,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-12-03 16:29:13,104 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:29:13,104 INFO L402 BasicCegarLoop]: trace histogram [25, 1, 1, 1] [2018-12-03 16:29:13,105 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:29:13,105 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:29:13,105 INFO L82 PathProgramCache]: Analyzing trace with hash -1943317268, now seen corresponding path program 13 times [2018-12-03 16:29:13,105 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:29:13,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:13,106 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:29:13,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:13,106 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:29:13,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:13,569 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 16:29:13,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:13,569 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:29:13,570 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:29:13,570 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:29:13,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:13,570 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 16:29:13,580 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:29:13,580 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:29:13,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:13,619 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:29:13,832 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 16:29:13,832 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:29:15,151 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 16:29:15,172 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:29:15,173 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2018-12-03 16:29:15,173 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:29:15,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 16:29:15,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 16:29:15,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1031, Invalid=1831, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 16:29:15,175 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 29 states. [2018-12-03 16:29:15,435 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 11 [2018-12-03 16:29:16,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:29:16,814 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2018-12-03 16:29:16,814 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 16:29:16,814 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 28 [2018-12-03 16:29:16,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:29:16,815 INFO L225 Difference]: With dead ends: 33 [2018-12-03 16:29:16,815 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 16:29:16,818 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2331, Invalid=3831, Unknown=0, NotChecked=0, Total=6162 [2018-12-03 16:29:16,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 16:29:16,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-12-03 16:29:16,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-03 16:29:16,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-12-03 16:29:16,824 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-12-03 16:29:16,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:29:16,824 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-12-03 16:29:16,824 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 16:29:16,824 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-12-03 16:29:16,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-03 16:29:16,825 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:29:16,825 INFO L402 BasicCegarLoop]: trace histogram [27, 1, 1, 1] [2018-12-03 16:29:16,825 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:29:16,825 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:29:16,826 INFO L82 PathProgramCache]: Analyzing trace with hash 782937036, now seen corresponding path program 14 times [2018-12-03 16:29:16,826 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:29:16,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:16,827 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:29:16,827 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:16,827 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:29:16,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:17,422 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 16:29:17,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:17,422 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:29:17,422 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:29:17,423 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:29:17,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:17,423 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 16:29:17,435 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:29:17,435 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:29:17,454 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-03 16:29:17,455 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:29:17,457 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:29:17,540 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 16:29:17,540 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:29:19,202 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 16:29:19,220 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:29:19,220 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-12-03 16:29:19,220 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:29:19,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-12-03 16:29:19,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-12-03 16:29:19,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1194, Invalid=2112, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 16:29:19,222 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 31 states. [2018-12-03 16:29:20,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:29:20,862 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2018-12-03 16:29:20,863 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 16:29:20,863 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 30 [2018-12-03 16:29:20,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:29:20,864 INFO L225 Difference]: With dead ends: 35 [2018-12-03 16:29:20,864 INFO L226 Difference]: Without dead ends: 33 [2018-12-03 16:29:20,867 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2706, Invalid=4434, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 16:29:20,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-03 16:29:20,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-12-03 16:29:20,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-03 16:29:20,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-12-03 16:29:20,872 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-12-03 16:29:20,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:29:20,872 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-12-03 16:29:20,872 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-12-03 16:29:20,872 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-12-03 16:29:20,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 16:29:20,873 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:29:20,873 INFO L402 BasicCegarLoop]: trace histogram [29, 1, 1, 1] [2018-12-03 16:29:20,874 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:29:20,874 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:29:20,874 INFO L82 PathProgramCache]: Analyzing trace with hash 783272620, now seen corresponding path program 15 times [2018-12-03 16:29:20,874 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:29:20,875 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:20,875 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:29:20,875 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:20,875 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:29:20,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:21,411 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 16:29:21,411 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:21,412 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:29:21,412 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:29:21,412 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:29:21,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:21,412 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 16:29:21,421 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:29:21,421 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:29:21,459 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:29:21,460 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:29:21,477 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:29:21,540 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 16:29:21,540 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:29:22,859 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 16:29:22,877 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:29:22,877 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-12-03 16:29:22,877 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:29:22,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-12-03 16:29:22,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-12-03 16:29:22,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1369, Invalid=2413, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 16:29:22,880 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 33 states. [2018-12-03 16:29:24,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:29:24,877 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-12-03 16:29:24,877 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 16:29:24,877 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 32 [2018-12-03 16:29:24,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:29:24,878 INFO L225 Difference]: With dead ends: 37 [2018-12-03 16:29:24,878 INFO L226 Difference]: Without dead ends: 35 [2018-12-03 16:29:24,881 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 465 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3109, Invalid=5081, Unknown=0, NotChecked=0, Total=8190 [2018-12-03 16:29:24,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-12-03 16:29:24,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-12-03 16:29:24,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-12-03 16:29:24,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-12-03 16:29:24,886 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-12-03 16:29:24,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:29:24,886 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-12-03 16:29:24,887 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-12-03 16:29:24,887 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-12-03 16:29:24,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-12-03 16:29:24,887 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:29:24,888 INFO L402 BasicCegarLoop]: trace histogram [31, 1, 1, 1] [2018-12-03 16:29:24,888 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:29:24,888 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:29:24,888 INFO L82 PathProgramCache]: Analyzing trace with hash 1105768844, now seen corresponding path program 16 times [2018-12-03 16:29:24,888 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:29:24,889 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:24,889 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:29:24,889 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:24,889 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:29:24,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:25,559 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 16:29:25,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:25,560 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:29:25,560 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:29:25,560 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:29:25,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:25,560 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 16:29:25,570 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:29:25,570 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:29:25,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:25,639 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:29:25,706 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 16:29:25,706 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:29:27,289 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 16:29:27,307 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:29:27,307 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 65 [2018-12-03 16:29:27,307 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:29:27,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 16:29:27,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 16:29:27,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1556, Invalid=2734, Unknown=0, NotChecked=0, Total=4290 [2018-12-03 16:29:27,309 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 35 states. [2018-12-03 16:29:29,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:29:29,384 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-12-03 16:29:29,385 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 16:29:29,385 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 34 [2018-12-03 16:29:29,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:29:29,386 INFO L225 Difference]: With dead ends: 39 [2018-12-03 16:29:29,386 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 16:29:29,388 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3540, Invalid=5772, Unknown=0, NotChecked=0, Total=9312 [2018-12-03 16:29:29,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 16:29:29,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-12-03 16:29:29,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-03 16:29:29,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-12-03 16:29:29,392 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-12-03 16:29:29,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:29:29,392 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-12-03 16:29:29,392 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 16:29:29,392 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-12-03 16:29:29,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-12-03 16:29:29,393 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:29:29,393 INFO L402 BasicCegarLoop]: trace histogram [33, 1, 1, 1] [2018-12-03 16:29:29,393 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:29:29,393 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:29:29,394 INFO L82 PathProgramCache]: Analyzing trace with hash 1786994796, now seen corresponding path program 17 times [2018-12-03 16:29:29,394 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:29:29,394 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:29,394 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:29:29,394 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:29,395 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:29:29,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:30,260 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 16:29:30,260 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:30,260 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:29:30,261 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:29:30,261 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:29:30,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:30,261 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 16:29:30,279 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:29:30,279 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:29:30,318 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-03 16:29:30,318 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:29:30,321 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:29:30,378 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 16:29:30,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:29:32,075 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 16:29:32,094 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:29:32,094 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-12-03 16:29:32,094 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:29:32,094 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-12-03 16:29:32,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-12-03 16:29:32,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1755, Invalid=3075, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 16:29:32,095 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 37 states. [2018-12-03 16:29:34,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:29:34,503 INFO L93 Difference]: Finished difference Result 41 states and 42 transitions. [2018-12-03 16:29:34,504 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 16:29:34,504 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 36 [2018-12-03 16:29:34,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:29:34,505 INFO L225 Difference]: With dead ends: 41 [2018-12-03 16:29:34,505 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 16:29:34,507 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 595 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=3999, Invalid=6507, Unknown=0, NotChecked=0, Total=10506 [2018-12-03 16:29:34,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 16:29:34,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-12-03 16:29:34,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-03 16:29:34,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-12-03 16:29:34,512 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-12-03 16:29:34,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:29:34,513 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-12-03 16:29:34,513 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-12-03 16:29:34,513 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-12-03 16:29:34,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 16:29:34,514 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:29:34,514 INFO L402 BasicCegarLoop]: trace histogram [35, 1, 1, 1] [2018-12-03 16:29:34,514 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:29:34,514 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:29:34,514 INFO L82 PathProgramCache]: Analyzing trace with hash -684861620, now seen corresponding path program 18 times [2018-12-03 16:29:34,514 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:29:34,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:34,515 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:29:34,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:34,515 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:29:34,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:35,582 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 16:29:35,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:35,582 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:29:35,583 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:29:35,583 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:29:35,583 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:35,583 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 16:29:35,592 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:29:35,593 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:29:35,645 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:29:35,646 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:29:35,671 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:29:35,741 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 16:29:35,741 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:29:37,732 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 16:29:37,753 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:29:37,753 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-12-03 16:29:37,753 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:29:37,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-12-03 16:29:37,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-12-03 16:29:37,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1966, Invalid=3436, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 16:29:37,755 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 39 states. [2018-12-03 16:29:40,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:29:40,579 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-12-03 16:29:40,580 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 16:29:40,580 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 38 [2018-12-03 16:29:40,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:29:40,581 INFO L225 Difference]: With dead ends: 43 [2018-12-03 16:29:40,581 INFO L226 Difference]: Without dead ends: 41 [2018-12-03 16:29:40,583 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=4486, Invalid=7286, Unknown=0, NotChecked=0, Total=11772 [2018-12-03 16:29:40,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-12-03 16:29:40,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-12-03 16:29:40,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-12-03 16:29:40,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-12-03 16:29:40,589 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-12-03 16:29:40,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:29:40,589 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-12-03 16:29:40,589 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-12-03 16:29:40,589 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-12-03 16:29:40,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-12-03 16:29:40,590 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:29:40,590 INFO L402 BasicCegarLoop]: trace histogram [37, 1, 1, 1] [2018-12-03 16:29:40,590 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:29:40,591 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:29:40,591 INFO L82 PathProgramCache]: Analyzing trace with hash -1021962708, now seen corresponding path program 19 times [2018-12-03 16:29:40,591 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:29:40,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:40,592 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:29:40,592 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:40,592 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:29:40,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:42,112 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 16:29:42,113 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:42,113 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:29:42,113 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:29:42,113 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:29:42,113 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:42,113 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 16:29:42,122 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:29:42,123 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:29:42,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:42,213 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:29:42,295 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 16:29:42,295 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:29:44,255 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 16:29:44,274 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:29:44,274 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 77 [2018-12-03 16:29:44,274 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:29:44,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 16:29:44,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 16:29:44,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2189, Invalid=3817, Unknown=0, NotChecked=0, Total=6006 [2018-12-03 16:29:44,276 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 41 states. [2018-12-03 16:29:47,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:29:47,315 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2018-12-03 16:29:47,315 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 16:29:47,315 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 40 [2018-12-03 16:29:47,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:29:47,316 INFO L225 Difference]: With dead ends: 45 [2018-12-03 16:29:47,316 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 16:29:47,317 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 741 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=5001, Invalid=8109, Unknown=0, NotChecked=0, Total=13110 [2018-12-03 16:29:47,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 16:29:47,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-12-03 16:29:47,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-12-03 16:29:47,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-12-03 16:29:47,323 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2018-12-03 16:29:47,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:29:47,324 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-12-03 16:29:47,324 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 16:29:47,324 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-12-03 16:29:47,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 16:29:47,325 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:29:47,325 INFO L402 BasicCegarLoop]: trace histogram [39, 1, 1, 1] [2018-12-03 16:29:47,325 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:29:47,325 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:29:47,325 INFO L82 PathProgramCache]: Analyzing trace with hash 1441406220, now seen corresponding path program 20 times [2018-12-03 16:29:47,326 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:29:47,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:47,326 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:29:47,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:47,326 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:29:47,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:48,241 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 16:29:48,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:48,241 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:29:48,241 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:29:48,241 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:29:48,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:48,242 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 16:29:48,252 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:29:48,252 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:29:48,280 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-12-03 16:29:48,280 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:29:48,285 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:29:48,368 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 16:29:48,368 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:29:50,856 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 16:29:50,875 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:29:50,875 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-12-03 16:29:50,876 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:29:50,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-12-03 16:29:50,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-12-03 16:29:50,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2424, Invalid=4218, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 16:29:50,877 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 43 states. [2018-12-03 16:29:54,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:29:54,235 INFO L93 Difference]: Finished difference Result 47 states and 48 transitions. [2018-12-03 16:29:54,235 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 16:29:54,235 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 42 [2018-12-03 16:29:54,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:29:54,236 INFO L225 Difference]: With dead ends: 47 [2018-12-03 16:29:54,236 INFO L226 Difference]: Without dead ends: 45 [2018-12-03 16:29:54,237 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 820 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=5544, Invalid=8976, Unknown=0, NotChecked=0, Total=14520 [2018-12-03 16:29:54,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-12-03 16:29:54,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-12-03 16:29:54,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 16:29:54,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-12-03 16:29:54,242 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2018-12-03 16:29:54,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:29:54,243 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-12-03 16:29:54,243 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-12-03 16:29:54,243 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-12-03 16:29:54,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-03 16:29:54,243 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:29:54,244 INFO L402 BasicCegarLoop]: trace histogram [41, 1, 1, 1] [2018-12-03 16:29:54,244 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:29:54,244 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:29:54,244 INFO L82 PathProgramCache]: Analyzing trace with hash -2083001364, now seen corresponding path program 21 times [2018-12-03 16:29:54,244 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:29:54,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:54,245 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:29:54,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:29:54,245 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:29:54,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:29:55,368 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 16:29:55,368 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:55,369 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:29:55,369 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:29:55,369 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:29:55,369 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:29:55,369 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 16:29:55,378 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:29:55,378 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:29:55,454 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:29:55,454 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:29:55,493 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:29:55,634 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 16:29:55,634 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:29:58,140 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 16:29:58,158 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:29:58,158 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2018-12-03 16:29:58,159 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:29:58,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-12-03 16:29:58,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-12-03 16:29:58,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2671, Invalid=4639, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 16:29:58,160 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 45 states. [2018-12-03 16:30:01,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:30:01,990 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-12-03 16:30:01,994 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 16:30:01,994 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 44 [2018-12-03 16:30:01,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:30:01,994 INFO L225 Difference]: With dead ends: 49 [2018-12-03 16:30:01,994 INFO L226 Difference]: Without dead ends: 47 [2018-12-03 16:30:01,996 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 903 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=6115, Invalid=9887, Unknown=0, NotChecked=0, Total=16002 [2018-12-03 16:30:01,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-12-03 16:30:02,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-12-03 16:30:02,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-12-03 16:30:02,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-12-03 16:30:02,002 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2018-12-03 16:30:02,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:30:02,002 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-12-03 16:30:02,002 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-12-03 16:30:02,002 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-12-03 16:30:02,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-12-03 16:30:02,003 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:30:02,003 INFO L402 BasicCegarLoop]: trace histogram [43, 1, 1, 1] [2018-12-03 16:30:02,003 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:30:02,003 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:30:02,003 INFO L82 PathProgramCache]: Analyzing trace with hash -309493044, now seen corresponding path program 22 times [2018-12-03 16:30:02,003 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:30:02,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:30:02,004 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:30:02,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:30:02,004 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:30:02,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:30:03,076 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 16:30:03,076 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:30:03,077 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:30:03,077 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:30:03,077 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:30:03,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:30:03,077 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 16:30:03,086 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:30:03,086 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:30:03,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:30:03,217 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:30:03,313 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 16:30:03,313 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:30:06,215 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 16:30:06,233 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:30:06,234 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 89 [2018-12-03 16:30:06,234 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:30:06,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 16:30:06,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 16:30:06,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2930, Invalid=5080, Unknown=0, NotChecked=0, Total=8010 [2018-12-03 16:30:06,235 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 47 states. [2018-12-03 16:30:10,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:30:10,343 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2018-12-03 16:30:10,344 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 16:30:10,344 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 46 [2018-12-03 16:30:10,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:30:10,345 INFO L225 Difference]: With dead ends: 51 [2018-12-03 16:30:10,345 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 16:30:10,345 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 990 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=6714, Invalid=10842, Unknown=0, NotChecked=0, Total=17556 [2018-12-03 16:30:10,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 16:30:10,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-12-03 16:30:10,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-03 16:30:10,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-12-03 16:30:10,351 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2018-12-03 16:30:10,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:30:10,351 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-12-03 16:30:10,351 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 16:30:10,352 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-12-03 16:30:10,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 16:30:10,352 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:30:10,352 INFO L402 BasicCegarLoop]: trace histogram [45, 1, 1, 1] [2018-12-03 16:30:10,353 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:30:10,353 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:30:10,353 INFO L82 PathProgramCache]: Analyzing trace with hash -1070014036, now seen corresponding path program 23 times [2018-12-03 16:30:10,353 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:30:10,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:30:10,354 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:30:10,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:30:10,354 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:30:10,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:30:12,266 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 16:30:12,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:30:12,267 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:30:12,267 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:30:12,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:30:12,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:30:12,268 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 16:30:12,277 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:30:12,277 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:30:12,345 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 16:30:12,346 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:30:12,349 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:30:12,570 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 16:30:12,571 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:30:15,459 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 16:30:15,477 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:30:15,477 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-12-03 16:30:15,478 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:30:15,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-12-03 16:30:15,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-12-03 16:30:15,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3201, Invalid=5541, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 16:30:15,479 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 49 states. [2018-12-03 16:30:15,833 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 16:30:15,961 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-12-03 16:30:20,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:30:20,102 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2018-12-03 16:30:20,102 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-12-03 16:30:20,103 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 48 [2018-12-03 16:30:20,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:30:20,104 INFO L225 Difference]: With dead ends: 53 [2018-12-03 16:30:20,104 INFO L226 Difference]: Without dead ends: 51 [2018-12-03 16:30:20,105 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1081 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=7341, Invalid=11841, Unknown=0, NotChecked=0, Total=19182 [2018-12-03 16:30:20,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-12-03 16:30:20,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-12-03 16:30:20,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-03 16:30:20,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-12-03 16:30:20,110 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2018-12-03 16:30:20,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:30:20,111 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-12-03 16:30:20,111 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-12-03 16:30:20,111 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-12-03 16:30:20,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-12-03 16:30:20,111 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:30:20,112 INFO L402 BasicCegarLoop]: trace histogram [47, 1, 1, 1] [2018-12-03 16:30:20,112 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:30:20,112 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:30:20,112 INFO L82 PathProgramCache]: Analyzing trace with hash -1786247028, now seen corresponding path program 24 times [2018-12-03 16:30:20,112 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:30:20,113 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:30:20,113 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:30:20,113 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:30:20,113 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:30:20,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:30:21,639 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 16:30:21,639 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:30:21,640 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:30:21,640 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:30:21,640 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:30:21,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:30:21,640 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 16:30:21,648 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:30:21,648 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:30:21,754 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:30:21,755 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:30:21,810 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:30:21,892 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 16:30:21,893 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:30:25,076 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 16:30:25,094 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:30:25,095 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2018-12-03 16:30:25,095 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:30:25,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-12-03 16:30:25,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-12-03 16:30:25,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3484, Invalid=6022, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 16:30:25,096 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 51 states. [2018-12-03 16:30:25,446 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 16:30:30,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:30:30,221 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-12-03 16:30:30,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-12-03 16:30:30,221 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 50 [2018-12-03 16:30:30,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:30:30,222 INFO L225 Difference]: With dead ends: 55 [2018-12-03 16:30:30,222 INFO L226 Difference]: Without dead ends: 53 [2018-12-03 16:30:30,224 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1176 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=7996, Invalid=12884, Unknown=0, NotChecked=0, Total=20880 [2018-12-03 16:30:30,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-12-03 16:30:30,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-12-03 16:30:30,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-12-03 16:30:30,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-12-03 16:30:30,229 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2018-12-03 16:30:30,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:30:30,229 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-12-03 16:30:30,229 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-12-03 16:30:30,229 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-12-03 16:30:30,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-12-03 16:30:30,230 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:30:30,230 INFO L402 BasicCegarLoop]: trace histogram [49, 1, 1, 1] [2018-12-03 16:30:30,230 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:30:30,230 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:30:30,230 INFO L82 PathProgramCache]: Analyzing trace with hash 1403582316, now seen corresponding path program 25 times [2018-12-03 16:30:30,230 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:30:30,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:30:30,231 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:30:30,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:30:30,231 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:30:30,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:30:31,883 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 16:30:31,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:30:31,884 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:30:31,884 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:30:31,884 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:30:31,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:30:31,884 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 16:30:31,893 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:30:31,893 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:30:32,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:30:32,075 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:30:32,155 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 16:30:32,156 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:30:35,453 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 16:30:35,471 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:30:35,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 101 [2018-12-03 16:30:35,472 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:30:35,472 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 16:30:35,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 16:30:35,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3779, Invalid=6523, Unknown=0, NotChecked=0, Total=10302 [2018-12-03 16:30:35,473 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 53 states. [2018-12-03 16:30:35,722 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 9 [2018-12-03 16:30:35,845 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:30:36,092 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 16:30:36,232 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 16:30:36,382 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 16:30:36,528 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-12-03 16:30:41,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:30:41,121 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2018-12-03 16:30:41,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 16:30:41,122 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 52 [2018-12-03 16:30:41,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:30:41,123 INFO L225 Difference]: With dead ends: 57 [2018-12-03 16:30:41,123 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 16:30:41,124 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1275 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=8679, Invalid=13971, Unknown=0, NotChecked=0, Total=22650 [2018-12-03 16:30:41,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 16:30:41,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-12-03 16:30:41,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-12-03 16:30:41,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-12-03 16:30:41,129 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2018-12-03 16:30:41,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:30:41,130 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-12-03 16:30:41,130 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 16:30:41,130 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-12-03 16:30:41,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-12-03 16:30:41,130 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:30:41,131 INFO L402 BasicCegarLoop]: trace histogram [51, 1, 1, 1] [2018-12-03 16:30:41,131 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:30:41,131 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:30:41,131 INFO L82 PathProgramCache]: Analyzing trace with hash 222932556, now seen corresponding path program 26 times [2018-12-03 16:30:41,131 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:30:41,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:30:41,132 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:30:41,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:30:41,132 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:30:41,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:30:42,788 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 16:30:42,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:30:42,788 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:30:42,788 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:30:42,788 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:30:42,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:30:42,788 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 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 16:30:42,797 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:30:42,797 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:30:42,832 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-12-03 16:30:42,832 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:30:42,835 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:30:42,957 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 16:30:42,957 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:30:46,925 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 16:30:46,945 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:30:46,945 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-12-03 16:30:46,945 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:30:46,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 16:30:46,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 16:30:46,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4086, Invalid=7044, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 16:30:46,947 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 55 states. [2018-12-03 16:30:47,076 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 8 [2018-12-03 16:30:47,202 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 9 [2018-12-03 16:30:47,333 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:30:47,464 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:30:47,595 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:30:47,728 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:30:53,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:30:53,131 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2018-12-03 16:30:53,131 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 16:30:53,131 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 54 [2018-12-03 16:30:53,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:30:53,132 INFO L225 Difference]: With dead ends: 59 [2018-12-03 16:30:53,132 INFO L226 Difference]: Without dead ends: 57 [2018-12-03 16:30:53,134 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1378 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=9390, Invalid=15102, Unknown=0, NotChecked=0, Total=24492 [2018-12-03 16:30:53,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-12-03 16:30:53,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-12-03 16:30:53,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-03 16:30:53,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-12-03 16:30:53,139 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2018-12-03 16:30:53,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:30:53,139 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-12-03 16:30:53,139 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 16:30:53,139 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-12-03 16:30:53,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-12-03 16:30:53,140 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:30:53,140 INFO L402 BasicCegarLoop]: trace histogram [53, 1, 1, 1] [2018-12-03 16:30:53,140 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:30:53,140 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:30:53,140 INFO L82 PathProgramCache]: Analyzing trace with hash -510120660, now seen corresponding path program 27 times [2018-12-03 16:30:53,140 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:30:53,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:30:53,141 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:30:53,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:30:53,141 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:30:53,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:30:54,694 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 16:30:54,694 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:30:54,694 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:30:54,694 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:30:54,694 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:30:54,694 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:30:54,695 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 16:30:54,703 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:30:54,703 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:30:54,851 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:30:54,851 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:30:54,932 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:30:55,023 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 16:30:55,024 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:30:59,286 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 16:30:59,305 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:30:59,305 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 109 [2018-12-03 16:30:59,305 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:30:59,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-12-03 16:30:59,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-12-03 16:30:59,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4405, Invalid=7585, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 16:30:59,306 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 57 states. [2018-12-03 16:30:59,448 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2018-12-03 16:30:59,578 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2018-12-03 16:30:59,716 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:30:59,850 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:30:59,989 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:31:00,122 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:31:00,258 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:31:00,539 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 16:31:05,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:31:05,979 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-12-03 16:31:05,980 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 16:31:05,980 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 56 [2018-12-03 16:31:05,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:31:05,980 INFO L225 Difference]: With dead ends: 61 [2018-12-03 16:31:05,980 INFO L226 Difference]: Without dead ends: 59 [2018-12-03 16:31:05,981 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1485 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=10129, Invalid=16277, Unknown=0, NotChecked=0, Total=26406 [2018-12-03 16:31:05,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-12-03 16:31:05,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-12-03 16:31:05,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-12-03 16:31:05,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-12-03 16:31:05,985 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2018-12-03 16:31:05,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:31:05,985 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-12-03 16:31:05,985 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-12-03 16:31:05,985 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-12-03 16:31:05,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-12-03 16:31:05,985 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:31:05,986 INFO L402 BasicCegarLoop]: trace histogram [55, 1, 1, 1] [2018-12-03 16:31:05,986 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:31:05,986 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:31:05,986 INFO L82 PathProgramCache]: Analyzing trace with hash -599624692, now seen corresponding path program 28 times [2018-12-03 16:31:05,986 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:31:05,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:31:05,987 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:31:05,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:31:05,987 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:31:06,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:31:08,396 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 16:31:08,396 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:31:08,396 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:31:08,396 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:31:08,396 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:31:08,397 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:31:08,397 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 16:31:08,408 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:31:08,409 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:31:08,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:31:08,650 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:31:08,763 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 16:31:08,764 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:31:13,415 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 16:31:13,433 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:31:13,433 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 113 [2018-12-03 16:31:13,434 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:31:13,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 16:31:13,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 16:31:13,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4736, Invalid=8146, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 16:31:13,435 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 59 states. [2018-12-03 16:31:13,583 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 8 [2018-12-03 16:31:13,724 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 9 [2018-12-03 16:31:13,886 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:31:14,032 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:31:14,178 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:31:14,315 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:31:14,461 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:31:14,607 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:31:14,753 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:31:14,909 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:31:20,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:31:20,825 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2018-12-03 16:31:20,825 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 16:31:20,825 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 58 [2018-12-03 16:31:20,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:31:20,826 INFO L225 Difference]: With dead ends: 63 [2018-12-03 16:31:20,826 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 16:31:20,828 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1596 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=10896, Invalid=17496, Unknown=0, NotChecked=0, Total=28392 [2018-12-03 16:31:20,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 16:31:20,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-12-03 16:31:20,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-12-03 16:31:20,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-12-03 16:31:20,833 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2018-12-03 16:31:20,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:31:20,833 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-12-03 16:31:20,833 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 16:31:20,833 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-12-03 16:31:20,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-12-03 16:31:20,833 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:31:20,834 INFO L402 BasicCegarLoop]: trace histogram [57, 1, 1, 1] [2018-12-03 16:31:20,834 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:31:20,834 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:31:20,834 INFO L82 PathProgramCache]: Analyzing trace with hash -713653524, now seen corresponding path program 29 times [2018-12-03 16:31:20,834 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:31:20,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:31:20,835 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:31:20,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:31:20,835 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:31:20,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:31:22,832 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 16:31:22,833 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:31:22,833 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:31:22,833 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:31:22,833 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:31:22,833 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:31:22,833 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 16:31:22,841 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:31:22,841 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:31:22,892 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-12-03 16:31:22,892 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:31:22,896 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:31:23,028 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 16:31:23,028 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:31:27,761 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 16:31:27,779 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:31:27,779 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 117 [2018-12-03 16:31:27,779 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:31:27,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-12-03 16:31:27,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-12-03 16:31:27,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5079, Invalid=8727, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 16:31:27,781 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 61 states. [2018-12-03 16:31:27,935 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 8 [2018-12-03 16:31:28,082 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 9 [2018-12-03 16:31:28,234 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:31:28,384 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:31:28,537 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:31:28,685 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:31:28,849 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:31:28,999 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:31:29,154 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:31:29,310 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:31:29,465 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:31:35,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:31:35,895 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2018-12-03 16:31:35,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-12-03 16:31:35,895 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 60 [2018-12-03 16:31:35,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:31:35,896 INFO L225 Difference]: With dead ends: 65 [2018-12-03 16:31:35,896 INFO L226 Difference]: Without dead ends: 63 [2018-12-03 16:31:35,898 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 16:31:35,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-12-03 16:31:35,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-12-03 16:31:35,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-03 16:31:35,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-12-03 16:31:35,902 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2018-12-03 16:31:35,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:31:35,903 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-12-03 16:31:35,903 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-12-03 16:31:35,903 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-12-03 16:31:35,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 16:31:35,903 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:31:35,904 INFO L402 BasicCegarLoop]: trace histogram [59, 1, 1, 1] [2018-12-03 16:31:35,904 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:31:35,904 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:31:35,904 INFO L82 PathProgramCache]: Analyzing trace with hash 1373788620, now seen corresponding path program 30 times [2018-12-03 16:31:35,904 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:31:35,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:31:35,905 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:31:35,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:31:35,905 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:31:36,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:31:38,058 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 16:31:38,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:31:38,058 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:31:38,058 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:31:38,059 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:31:38,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:31:38,059 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 16:31:38,069 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:31:38,070 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:31:38,264 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:31:38,264 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:31:38,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:31:38,534 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 16:31:38,534 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:31:43,751 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 16:31:43,770 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:31:43,770 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 121 [2018-12-03 16:31:43,770 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:31:43,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-12-03 16:31:43,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-12-03 16:31:43,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5434, Invalid=9328, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 16:31:43,772 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 63 states. [2018-12-03 16:31:43,941 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 8 [2018-12-03 16:31:44,094 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 9 [2018-12-03 16:31:44,256 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:31:44,411 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:31:44,574 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:31:44,730 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:31:44,885 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:31:45,050 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:31:45,216 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:31:45,384 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:31:45,550 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:31:45,713 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:31:45,881 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:31:46,617 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 16:31:52,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:31:52,414 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-12-03 16:31:52,414 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 16:31:52,414 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 62 [2018-12-03 16:31:52,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:31:52,415 INFO L225 Difference]: With dead ends: 67 [2018-12-03 16:31:52,415 INFO L226 Difference]: Without dead ends: 65 [2018-12-03 16:31:52,416 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1830 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=12514, Invalid=20066, Unknown=0, NotChecked=0, Total=32580 [2018-12-03 16:31:52,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-12-03 16:31:52,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2018-12-03 16:31:52,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-12-03 16:31:52,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-12-03 16:31:52,421 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2018-12-03 16:31:52,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:31:52,422 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-12-03 16:31:52,422 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-12-03 16:31:52,422 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-12-03 16:31:52,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-12-03 16:31:52,422 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:31:52,422 INFO L402 BasicCegarLoop]: trace histogram [61, 1, 1, 1] [2018-12-03 16:31:52,423 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:31:52,423 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:31:52,423 INFO L82 PathProgramCache]: Analyzing trace with hash 1655961772, now seen corresponding path program 31 times [2018-12-03 16:31:52,423 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:31:52,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:31:52,425 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:31:52,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:31:52,425 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:31:52,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:31:54,718 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 16:31:54,718 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:31:54,718 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:31:54,718 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:31:54,718 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:31:54,718 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:31:54,718 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 16:31:54,726 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:31:54,727 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:31:54,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:31:55,051 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:31:55,173 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 16:31:55,173 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:32:00,640 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 16:32:00,659 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:32:00,659 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 125 [2018-12-03 16:32:00,659 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:32:00,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 16:32:00,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 16:32:00,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5801, Invalid=9949, Unknown=0, NotChecked=0, Total=15750 [2018-12-03 16:32:00,661 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 65 states. [2018-12-03 16:32:00,833 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2018-12-03 16:32:00,993 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 9 [2018-12-03 16:32:01,163 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:32:01,330 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:32:01,496 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:32:01,658 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:32:01,845 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:32:02,010 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:32:02,183 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:32:02,362 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:32:02,535 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:32:02,702 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:32:02,874 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:32:03,042 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:32:03,237 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:32:03,440 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:32:10,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:32:10,205 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-12-03 16:32:10,206 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 16:32:10,206 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 64 [2018-12-03 16:32:10,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:32:10,207 INFO L225 Difference]: With dead ends: 69 [2018-12-03 16:32:10,207 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 16:32:10,209 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1953 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=13365, Invalid=21417, Unknown=0, NotChecked=0, Total=34782 [2018-12-03 16:32:10,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 16:32:10,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-12-03 16:32:10,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-12-03 16:32:10,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2018-12-03 16:32:10,214 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2018-12-03 16:32:10,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:32:10,215 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2018-12-03 16:32:10,215 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 16:32:10,215 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2018-12-03 16:32:10,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-12-03 16:32:10,216 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:32:10,216 INFO L402 BasicCegarLoop]: trace histogram [63, 1, 1, 1] [2018-12-03 16:32:10,216 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:32:10,216 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:32:10,216 INFO L82 PathProgramCache]: Analyzing trace with hash -2053546100, now seen corresponding path program 32 times [2018-12-03 16:32:10,216 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:32:10,217 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:32:10,217 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:32:10,217 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:32:10,217 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:32:10,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:32:12,409 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 16:32:12,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:32:12,410 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:32:12,410 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:32:12,410 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:32:12,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:32:12,410 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 16:32:12,419 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:32:12,419 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:32:12,466 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-12-03 16:32:12,467 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:32:12,471 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:32:12,575 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 16:32:12,575 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:32:18,293 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 16:32:18,312 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:32:18,312 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 129 [2018-12-03 16:32:18,312 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:32:18,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-12-03 16:32:18,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-12-03 16:32:18,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6180, Invalid=10590, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 16:32:18,313 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 67 states. [2018-12-03 16:32:18,493 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 8 [2018-12-03 16:32:18,682 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 9 [2018-12-03 16:32:18,883 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:32:19,057 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:32:19,239 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:32:19,419 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:32:19,607 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:32:19,788 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:32:19,974 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:32:20,152 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:32:20,330 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:32:20,511 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:32:20,695 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:32:20,887 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:32:21,077 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:32:21,445 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:32:28,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:32:28,516 INFO L93 Difference]: Finished difference Result 71 states and 72 transitions. [2018-12-03 16:32:28,517 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 16:32:28,517 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 66 [2018-12-03 16:32:28,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:32:28,518 INFO L225 Difference]: With dead ends: 71 [2018-12-03 16:32:28,518 INFO L226 Difference]: Without dead ends: 69 [2018-12-03 16:32:28,519 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2080 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=14244, Invalid=22812, Unknown=0, NotChecked=0, Total=37056 [2018-12-03 16:32:28,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-12-03 16:32:28,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-12-03 16:32:28,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-12-03 16:32:28,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-12-03 16:32:28,524 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2018-12-03 16:32:28,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:32:28,525 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-12-03 16:32:28,525 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-12-03 16:32:28,525 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-12-03 16:32:28,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-12-03 16:32:28,525 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:32:28,525 INFO L402 BasicCegarLoop]: trace histogram [65, 1, 1, 1] [2018-12-03 16:32:28,525 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:32:28,526 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:32:28,526 INFO L82 PathProgramCache]: Analyzing trace with hash -2067755412, now seen corresponding path program 33 times [2018-12-03 16:32:28,526 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:32:28,526 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:32:28,526 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:32:28,526 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:32:28,527 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:32:28,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:32:30,968 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 16:32:30,969 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:32:30,969 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:32:30,969 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:32:30,969 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:32:30,969 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:32:30,969 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 16:32:30,979 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:32:30,979 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:32:31,223 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:32:31,224 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:32:31,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:32:31,542 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 16:32:31,543 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:32:37,550 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 16:32:37,568 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:32:37,569 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 133 [2018-12-03 16:32:37,569 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:32:37,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-12-03 16:32:37,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-12-03 16:32:37,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6571, Invalid=11251, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 16:32:37,570 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 69 states. [2018-12-03 16:32:37,755 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2018-12-03 16:32:37,931 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2018-12-03 16:32:38,121 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:32:38,307 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:32:38,498 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:32:38,682 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:32:38,870 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:32:39,076 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:32:39,293 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:32:39,497 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:32:39,689 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:32:39,884 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:32:40,070 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:32:40,253 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:32:40,449 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:32:40,644 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:32:40,835 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:32:41,034 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:32:41,233 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:32:48,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:32:48,477 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2018-12-03 16:32:48,477 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-12-03 16:32:48,477 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 68 [2018-12-03 16:32:48,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:32:48,478 INFO L225 Difference]: With dead ends: 73 [2018-12-03 16:32:48,478 INFO L226 Difference]: Without dead ends: 71 [2018-12-03 16:32:48,479 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2211 ImplicationChecksByTransitivity, 18.9s TimeCoverageRelationStatistics Valid=15151, Invalid=24251, Unknown=0, NotChecked=0, Total=39402 [2018-12-03 16:32:48,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-12-03 16:32:48,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2018-12-03 16:32:48,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-12-03 16:32:48,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2018-12-03 16:32:48,483 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2018-12-03 16:32:48,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:32:48,483 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2018-12-03 16:32:48,483 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-12-03 16:32:48,483 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2018-12-03 16:32:48,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-12-03 16:32:48,484 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:32:48,484 INFO L402 BasicCegarLoop]: trace histogram [67, 1, 1, 1] [2018-12-03 16:32:48,484 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:32:48,484 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:32:48,485 INFO L82 PathProgramCache]: Analyzing trace with hash 1456964940, now seen corresponding path program 34 times [2018-12-03 16:32:48,485 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:32:48,485 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:32:48,485 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:32:48,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:32:48,486 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:32:48,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:32:52,382 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 16:32:52,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:32:52,382 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:32:52,383 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:32:52,383 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:32:52,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:32:52,383 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 16:32:52,391 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:32:52,392 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:32:52,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:32:52,815 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:32:52,904 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 16:32:52,904 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:32:59,871 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 16:32:59,889 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:32:59,889 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 137 [2018-12-03 16:32:59,889 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:32:59,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 16:32:59,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 16:32:59,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6974, Invalid=11932, Unknown=0, NotChecked=0, Total=18906 [2018-12-03 16:32:59,891 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 71 states. [2018-12-03 16:33:00,084 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 8 [2018-12-03 16:33:00,264 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 9 [2018-12-03 16:33:00,457 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:33:00,648 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:33:00,847 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:33:01,041 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:33:01,246 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:33:01,443 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:33:01,645 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:33:01,849 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:33:02,053 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:33:02,256 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:33:02,457 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:33:02,650 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:33:02,851 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:33:03,058 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:33:03,259 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:33:03,462 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:33:03,670 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:33:03,879 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:33:04,082 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:33:04,283 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:33:04,700 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 16:33:04,941 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 16:33:11,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:33:11,759 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2018-12-03 16:33:11,760 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 16:33:11,760 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 70 [2018-12-03 16:33:11,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:33:11,761 INFO L225 Difference]: With dead ends: 75 [2018-12-03 16:33:11,761 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 16:33:11,763 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2346 ImplicationChecksByTransitivity, 22.1s TimeCoverageRelationStatistics Valid=16086, Invalid=25734, Unknown=0, NotChecked=0, Total=41820 [2018-12-03 16:33:11,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 16:33:11,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2018-12-03 16:33:11,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-03 16:33:11,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2018-12-03 16:33:11,768 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2018-12-03 16:33:11,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:33:11,768 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2018-12-03 16:33:11,768 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 16:33:11,769 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2018-12-03 16:33:11,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 16:33:11,769 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:33:11,769 INFO L402 BasicCegarLoop]: trace histogram [69, 1, 1, 1] [2018-12-03 16:33:11,769 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:33:11,770 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:33:11,770 INFO L82 PathProgramCache]: Analyzing trace with hash -15973332, now seen corresponding path program 35 times [2018-12-03 16:33:11,770 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:33:11,770 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:33:11,771 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:33:11,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:33:11,771 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:33:12,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:33:14,386 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 16:33:14,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:33:14,386 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:33:14,386 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:33:14,386 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:33:14,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:33:14,386 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 16:33:14,397 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:33:14,397 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:33:14,447 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-12-03 16:33:14,447 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:33:14,452 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:33:14,550 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 16:33:14,550 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:33:21,626 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 16:33:21,645 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:33:21,645 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 141 [2018-12-03 16:33:21,645 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:33:21,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-12-03 16:33:21,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-12-03 16:33:21,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7389, Invalid=12633, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 16:33:21,646 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 73 states. [2018-12-03 16:33:21,854 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 8 [2018-12-03 16:33:22,049 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 9 [2018-12-03 16:33:22,250 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:33:22,448 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:33:22,652 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:33:22,849 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:33:23,053 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:33:23,256 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:33:23,480 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:33:23,684 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:33:23,892 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:33:24,100 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:33:24,305 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:33:24,506 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:33:24,722 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:33:24,935 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:33:25,155 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:33:25,384 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:33:25,606 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:33:25,821 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:33:26,037 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:33:26,252 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:33:26,465 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:33:26,924 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 16:33:34,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:33:34,303 INFO L93 Difference]: Finished difference Result 77 states and 78 transitions. [2018-12-03 16:33:34,303 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-12-03 16:33:34,303 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 72 [2018-12-03 16:33:34,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:33:34,304 INFO L225 Difference]: With dead ends: 77 [2018-12-03 16:33:34,304 INFO L226 Difference]: Without dead ends: 75 [2018-12-03 16:33:34,305 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2485 ImplicationChecksByTransitivity, 21.8s TimeCoverageRelationStatistics Valid=17049, Invalid=27261, Unknown=0, NotChecked=0, Total=44310 [2018-12-03 16:33:34,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-12-03 16:33:34,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-12-03 16:33:34,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-12-03 16:33:34,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-12-03 16:33:34,310 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2018-12-03 16:33:34,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:33:34,310 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-12-03 16:33:34,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-12-03 16:33:34,311 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-12-03 16:33:34,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-12-03 16:33:34,311 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:33:34,311 INFO L402 BasicCegarLoop]: trace histogram [71, 1, 1, 1] [2018-12-03 16:33:34,312 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:33:34,312 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:33:34,312 INFO L82 PathProgramCache]: Analyzing trace with hash 1829554956, now seen corresponding path program 36 times [2018-12-03 16:33:34,312 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:33:34,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:33:34,313 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:33:34,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:33:34,313 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:33:34,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:33:37,292 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 16:33:37,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:33:37,292 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:33:37,292 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:33:37,292 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:33:37,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:33:37,293 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 16:33:37,301 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:33:37,301 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:33:37,616 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:33:37,616 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:33:37,810 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:33:37,972 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 16:33:37,972 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:33:45,175 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 16:33:45,194 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:33:45,194 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 145 [2018-12-03 16:33:45,194 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:33:45,194 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-12-03 16:33:45,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-12-03 16:33:45,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7816, Invalid=13354, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 16:33:45,195 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 75 states. [2018-12-03 16:33:45,461 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 8 [2018-12-03 16:33:45,685 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 9 [2018-12-03 16:33:45,929 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:33:46,146 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:33:46,359 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:33:46,565 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:33:46,783 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:33:46,997 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:33:47,232 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:33:47,451 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:33:47,669 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:33:47,887 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:33:48,096 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:33:48,319 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:33:48,545 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:33:48,775 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:33:49,001 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:33:49,229 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:33:49,452 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:33:49,679 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:33:49,908 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:33:50,153 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:33:50,378 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:33:50,608 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:33:50,851 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:33:51,096 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:33:59,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:33:59,077 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-12-03 16:33:59,078 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 16:33:59,078 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 74 [2018-12-03 16:33:59,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:33:59,079 INFO L225 Difference]: With dead ends: 79 [2018-12-03 16:33:59,079 INFO L226 Difference]: Without dead ends: 77 [2018-12-03 16:33:59,080 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2628 ImplicationChecksByTransitivity, 23.4s TimeCoverageRelationStatistics Valid=18040, Invalid=28832, Unknown=0, NotChecked=0, Total=46872 [2018-12-03 16:33:59,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-12-03 16:33:59,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2018-12-03 16:33:59,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-12-03 16:33:59,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2018-12-03 16:33:59,087 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2018-12-03 16:33:59,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:33:59,087 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2018-12-03 16:33:59,087 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-12-03 16:33:59,087 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2018-12-03 16:33:59,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-12-03 16:33:59,088 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:33:59,088 INFO L402 BasicCegarLoop]: trace histogram [73, 1, 1, 1] [2018-12-03 16:33:59,088 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:33:59,088 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:33:59,088 INFO L82 PathProgramCache]: Analyzing trace with hash 1560746476, now seen corresponding path program 37 times [2018-12-03 16:33:59,089 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:33:59,089 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:33:59,089 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:33:59,089 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:33:59,090 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:33:59,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:34:02,339 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 16:34:02,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:34:02,340 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:34:02,340 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:34:02,340 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:34:02,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:34:02,340 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 16:34:02,358 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:34:02,358 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:34:02,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:34:02,910 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:34:03,029 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 16:34:03,030 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:34:10,794 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 16:34:10,813 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:34:10,813 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 149 [2018-12-03 16:34:10,813 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:34:10,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 16:34:10,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 16:34:10,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8255, Invalid=14095, Unknown=0, NotChecked=0, Total=22350 [2018-12-03 16:34:10,815 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 77 states. [2018-12-03 16:34:11,037 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2018-12-03 16:34:11,272 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 9 [2018-12-03 16:34:11,519 WARN L180 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:34:11,741 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:34:11,975 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:34:12,189 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:34:12,414 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:34:12,633 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:34:12,856 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:34:13,085 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:34:13,315 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:34:13,547 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:34:13,772 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:34:13,993 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:34:14,223 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:34:14,474 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:34:14,701 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:34:14,937 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:34:15,175 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:34:15,421 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:34:15,663 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:34:15,901 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:34:16,139 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:34:16,386 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:34:16,649 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:34:16,894 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:34:17,138 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:34:17,370 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:34:25,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:34:25,520 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2018-12-03 16:34:25,520 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 16:34:25,521 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 76 [2018-12-03 16:34:25,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:34:25,521 INFO L225 Difference]: With dead ends: 81 [2018-12-03 16:34:25,521 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 16:34:25,522 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 221 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2775 ImplicationChecksByTransitivity, 25.0s TimeCoverageRelationStatistics Valid=19059, Invalid=30447, Unknown=0, NotChecked=0, Total=49506 [2018-12-03 16:34:25,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 16:34:25,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-12-03 16:34:25,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-12-03 16:34:25,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-12-03 16:34:25,527 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2018-12-03 16:34:25,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:34:25,527 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-12-03 16:34:25,527 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 16:34:25,527 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-12-03 16:34:25,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-12-03 16:34:25,527 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:34:25,527 INFO L402 BasicCegarLoop]: trace histogram [75, 1, 1, 1] [2018-12-03 16:34:25,528 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:34:25,528 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:34:25,528 INFO L82 PathProgramCache]: Analyzing trace with hash 933834956, now seen corresponding path program 38 times [2018-12-03 16:34:25,528 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:34:25,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:34:25,529 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:34:25,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:34:25,529 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:34:25,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:34:29,095 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 16:34:29,095 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:34:29,095 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:34:29,095 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:34:29,095 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:34:29,096 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:34:29,096 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 16:34:29,112 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:34:29,112 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:34:29,225 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-12-03 16:34:29,226 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:34:29,232 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:34:29,332 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 16:34:29,332 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:34:37,700 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 16:34:37,719 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:34:37,719 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 153 [2018-12-03 16:34:37,719 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:34:37,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-12-03 16:34:37,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-12-03 16:34:37,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8706, Invalid=14856, Unknown=0, NotChecked=0, Total=23562 [2018-12-03 16:34:37,721 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 79 states. [2018-12-03 16:34:37,991 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 8 [2018-12-03 16:34:38,223 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 9 [2018-12-03 16:34:38,455 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:34:38,684 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:34:38,938 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:34:39,158 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:34:39,381 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:34:39,607 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:34:39,853 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:34:40,090 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:34:40,330 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:34:40,567 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:34:40,809 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:34:41,042 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:34:41,290 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:34:41,537 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:34:41,784 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:34:42,061 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:34:42,331 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:34:42,582 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:34:42,829 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:34:43,090 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:34:43,345 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:34:43,591 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:34:43,831 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:34:44,082 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:34:44,320 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:34:44,564 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:34:44,815 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:34:45,066 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:34:53,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:34:53,646 INFO L93 Difference]: Finished difference Result 83 states and 84 transitions. [2018-12-03 16:34:53,646 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-12-03 16:34:53,646 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 78 [2018-12-03 16:34:53,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:34:53,647 INFO L225 Difference]: With dead ends: 83 [2018-12-03 16:34:53,647 INFO L226 Difference]: Without dead ends: 81 [2018-12-03 16:34:53,648 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 227 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2926 ImplicationChecksByTransitivity, 27.1s TimeCoverageRelationStatistics Valid=20106, Invalid=32106, Unknown=0, NotChecked=0, Total=52212 [2018-12-03 16:34:53,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-12-03 16:34:53,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-12-03 16:34:53,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-12-03 16:34:53,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-12-03 16:34:53,653 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2018-12-03 16:34:53,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:34:53,653 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-12-03 16:34:53,653 INFO L481 AbstractCegarLoop]: Interpolant automaton has 79 states. [2018-12-03 16:34:53,653 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-12-03 16:34:53,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-12-03 16:34:53,654 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:34:53,654 INFO L402 BasicCegarLoop]: trace histogram [77, 1, 1, 1] [2018-12-03 16:34:53,654 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:34:53,654 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:34:53,654 INFO L82 PathProgramCache]: Analyzing trace with hash -232714324, now seen corresponding path program 39 times [2018-12-03 16:34:53,654 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:34:53,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:34:53,655 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:34:53,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:34:53,655 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:34:53,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:34:56,961 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 16:34:56,961 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:34:56,961 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:34:56,962 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:34:56,962 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:34:56,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:34:56,962 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 16:34:56,970 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:34:56,970 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:34:57,366 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:34:57,367 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:34:57,595 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:34:57,748 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 16:34:57,748 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:35:06,028 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 16:35:06,047 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:35:06,047 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 157 [2018-12-03 16:35:06,047 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:35:06,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-12-03 16:35:06,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-12-03 16:35:06,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9169, Invalid=15637, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 16:35:06,049 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 81 states. [2018-12-03 16:35:06,292 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 8 [2018-12-03 16:35:06,529 WARN L180 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 9 [2018-12-03 16:35:06,770 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:35:07,015 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:35:07,255 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:35:07,490 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:35:07,752 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:35:08,022 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:35:08,268 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:35:08,522 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:35:08,773 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:35:09,031 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:35:09,270 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:35:09,516 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:35:09,775 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:35:10,024 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:35:10,282 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:35:10,550 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:35:10,809 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:35:11,064 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:35:11,335 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:35:11,616 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:35:11,874 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:35:12,129 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:35:12,383 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:35:12,657 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:35:12,932 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:35:13,183 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:35:13,441 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:35:13,693 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:35:13,943 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:35:14,192 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:35:14,957 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 16:35:22,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:35:22,837 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2018-12-03 16:35:22,837 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 16:35:22,837 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 80 [2018-12-03 16:35:22,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:35:22,838 INFO L225 Difference]: With dead ends: 85 [2018-12-03 16:35:22,838 INFO L226 Difference]: Without dead ends: 83 [2018-12-03 16:35:22,840 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 233 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3081 ImplicationChecksByTransitivity, 27.7s TimeCoverageRelationStatistics Valid=21181, Invalid=33809, Unknown=0, NotChecked=0, Total=54990 [2018-12-03 16:35:22,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-12-03 16:35:22,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2018-12-03 16:35:22,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-12-03 16:35:22,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2018-12-03 16:35:22,845 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2018-12-03 16:35:22,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:35:22,845 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2018-12-03 16:35:22,845 INFO L481 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-12-03 16:35:22,845 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2018-12-03 16:35:22,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-12-03 16:35:22,846 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:35:22,846 INFO L402 BasicCegarLoop]: trace histogram [79, 1, 1, 1] [2018-12-03 16:35:22,846 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:35:22,846 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:35:22,846 INFO L82 PathProgramCache]: Analyzing trace with hash -300108148, now seen corresponding path program 40 times [2018-12-03 16:35:22,846 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:35:22,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:35:22,847 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:35:22,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:35:22,847 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:35:23,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:35:26,389 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 16:35:26,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:35:26,389 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:35:26,389 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:35:26,389 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:35:26,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:35:26,390 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 16:35:26,397 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:35:26,398 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:35:26,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:35:27,066 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:35:27,177 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 16:35:27,177 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:35:36,331 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 16:35:36,352 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:35:36,352 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 161 [2018-12-03 16:35:36,352 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:35:36,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 16:35:36,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 16:35:36,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9644, Invalid=16438, Unknown=0, NotChecked=0, Total=26082 [2018-12-03 16:35:36,354 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 83 states. [2018-12-03 16:35:36,606 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 8 [2018-12-03 16:35:36,842 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 9 [2018-12-03 16:35:37,091 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:35:37,336 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:35:37,588 WARN L180 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:35:37,830 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:35:38,078 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:35:38,344 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:35:38,625 WARN L180 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:35:38,883 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:35:39,138 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:35:39,403 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:35:39,661 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:35:39,909 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:35:40,183 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:35:40,466 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:35:40,732 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:35:41,002 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:35:41,273 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:35:41,547 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:35:41,820 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:35:42,095 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:35:42,378 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:35:42,644 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:35:42,915 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:35:43,202 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:35:43,483 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:35:43,752 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:35:44,016 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:35:44,279 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:35:44,547 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:35:44,813 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:35:54,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:35:54,361 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2018-12-03 16:35:54,362 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 16:35:54,362 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 82 [2018-12-03 16:35:54,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:35:54,363 INFO L225 Difference]: With dead ends: 87 [2018-12-03 16:35:54,363 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 16:35:54,365 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3240 ImplicationChecksByTransitivity, 29.9s TimeCoverageRelationStatistics Valid=22284, Invalid=35556, Unknown=0, NotChecked=0, Total=57840 [2018-12-03 16:35:54,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 16:35:54,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2018-12-03 16:35:54,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-12-03 16:35:54,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2018-12-03 16:35:54,369 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2018-12-03 16:35:54,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:35:54,369 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2018-12-03 16:35:54,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 16:35:54,370 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2018-12-03 16:35:54,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-12-03 16:35:54,370 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:35:54,370 INFO L402 BasicCegarLoop]: trace histogram [81, 1, 1, 1] [2018-12-03 16:35:54,370 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:35:54,370 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:35:54,370 INFO L82 PathProgramCache]: Analyzing trace with hash -641063572, now seen corresponding path program 41 times [2018-12-03 16:35:54,371 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:35:54,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:35:54,371 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:35:54,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:35:54,371 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:35:54,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:35:57,910 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 16:35:57,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:35:57,911 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:35:57,911 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:35:57,911 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:35:57,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:35:57,911 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 16:35:57,920 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:35:57,921 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:35:57,984 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-12-03 16:35:57,985 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:35:57,991 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:35:58,107 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 16:35:58,108 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:36:07,727 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 16:36:07,746 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:36:07,746 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 165 [2018-12-03 16:36:07,746 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:36:07,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 85 states [2018-12-03 16:36:07,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2018-12-03 16:36:07,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10131, Invalid=17259, Unknown=0, NotChecked=0, Total=27390 [2018-12-03 16:36:07,747 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 85 states. [2018-12-03 16:36:08,007 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 8 [2018-12-03 16:36:08,260 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 9 [2018-12-03 16:36:08,517 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:36:08,769 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:36:09,034 WARN L180 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:36:09,300 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:36:09,561 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:36:09,819 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:36:10,106 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:36:10,373 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:36:10,642 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:36:10,905 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:36:11,167 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:36:11,432 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:36:11,712 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:36:12,002 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:36:12,269 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:36:12,549 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:36:12,825 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:36:13,110 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:36:13,400 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:36:13,687 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:36:13,978 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:36:14,292 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:36:14,578 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:36:14,867 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:36:15,146 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:36:15,425 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:36:15,696 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:36:15,972 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:36:16,254 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:36:16,544 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:36:16,816 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:36:17,086 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:36:17,359 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:36:17,625 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:36:26,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:36:26,830 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2018-12-03 16:36:26,830 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-12-03 16:36:26,830 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 84 [2018-12-03 16:36:26,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:36:26,831 INFO L225 Difference]: With dead ends: 89 [2018-12-03 16:36:26,831 INFO L226 Difference]: Without dead ends: 87 [2018-12-03 16:36:26,833 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3403 ImplicationChecksByTransitivity, 31.4s TimeCoverageRelationStatistics Valid=23415, Invalid=37347, Unknown=0, NotChecked=0, Total=60762 [2018-12-03 16:36:26,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-12-03 16:36:26,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-12-03 16:36:26,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-03 16:36:26,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-12-03 16:36:26,839 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2018-12-03 16:36:26,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:36:26,840 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-12-03 16:36:26,840 INFO L481 AbstractCegarLoop]: Interpolant automaton has 85 states. [2018-12-03 16:36:26,840 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-12-03 16:36:26,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 16:36:26,840 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:36:26,841 INFO L402 BasicCegarLoop]: trace histogram [83, 1, 1, 1] [2018-12-03 16:36:26,841 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:36:26,841 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:36:26,841 INFO L82 PathProgramCache]: Analyzing trace with hash -1881711540, now seen corresponding path program 42 times [2018-12-03 16:36:26,841 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:36:26,842 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:36:26,842 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:36:26,842 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:36:26,842 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:36:27,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:36:30,889 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 16:36:30,889 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:36:30,889 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:36:30,889 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:36:30,889 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:36:30,890 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:36:30,890 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 16:36:30,908 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:36:30,908 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:36:31,398 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:36:31,398 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:36:31,689 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:36:31,815 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 16:36:31,816 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:36:41,700 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 16:36:41,721 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:36:41,721 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 169 [2018-12-03 16:36:41,721 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:36:41,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-12-03 16:36:41,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-12-03 16:36:41,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10630, Invalid=18100, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 16:36:41,723 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 87 states. [2018-12-03 16:36:42,015 WARN L180 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 8 [2018-12-03 16:36:42,272 WARN L180 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 9 [2018-12-03 16:36:42,550 WARN L180 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 16:36:43,010 WARN L180 SmtUtils]: Spent 426.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 16:36:43,292 WARN L180 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:36:43,564 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:36:43,845 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:36:44,124 WARN L180 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:36:44,418 WARN L180 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:36:44,704 WARN L180 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:36:45,029 WARN L180 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:36:45,340 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:36:45,621 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:36:45,896 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:36:46,195 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:36:46,491 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:36:46,780 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:36:47,071 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:36:47,385 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:36:47,677 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:36:47,975 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:36:48,276 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:36:48,578 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:36:48,877 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:36:49,174 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:36:49,476 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:36:49,775 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:36:50,099 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:36:50,409 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:36:50,707 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:36:50,993 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:36:51,280 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:36:51,566 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:36:51,856 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:36:52,137 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:36:52,420 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:36:52,700 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:36:52,982 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:36:53,268 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 16:37:02,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:37:02,587 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2018-12-03 16:37:02,587 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-12-03 16:37:02,587 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 86 [2018-12-03 16:37:02,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:37:02,588 INFO L225 Difference]: With dead ends: 91 [2018-12-03 16:37:02,588 INFO L226 Difference]: Without dead ends: 89 [2018-12-03 16:37:02,589 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 251 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3570 ImplicationChecksByTransitivity, 33.9s TimeCoverageRelationStatistics Valid=24574, Invalid=39182, Unknown=0, NotChecked=0, Total=63756 [2018-12-03 16:37:02,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-12-03 16:37:02,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2018-12-03 16:37:02,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-12-03 16:37:02,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2018-12-03 16:37:02,595 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2018-12-03 16:37:02,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:37:02,595 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2018-12-03 16:37:02,595 INFO L481 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-12-03 16:37:02,595 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2018-12-03 16:37:02,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-12-03 16:37:02,595 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:37:02,596 INFO L402 BasicCegarLoop]: trace histogram [85, 1, 1, 1] [2018-12-03 16:37:02,596 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:37:02,596 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:37:02,596 INFO L82 PathProgramCache]: Analyzing trace with hash -143500500, now seen corresponding path program 43 times [2018-12-03 16:37:02,596 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:37:02,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:37:02,597 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:37:02,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:37:02,597 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:37:03,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:37:06,793 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 16:37:06,794 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:37:06,794 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:37:06,794 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:37:06,794 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:37:06,794 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:37:06,794 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 16:37:06,802 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:37:06,803 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:37:07,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:37:07,633 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:37:07,750 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 16:37:07,750 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:37:18,093 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 16:37:18,112 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:37:18,112 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 173 [2018-12-03 16:37:18,112 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:37:18,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 16:37:18,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 16:37:18,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11141, Invalid=18961, Unknown=0, NotChecked=0, Total=30102 [2018-12-03 16:37:18,114 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 89 states. [2018-12-03 16:37:18,397 WARN L180 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 8 [2018-12-03 16:37:18,679 WARN L180 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 9 [2018-12-03 16:37:18,957 WARN L180 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 16:37:19,236 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 16:37:19,527 WARN L180 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 16:37:19,806 WARN L180 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 16:37:20,093 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:37:20,375 WARN L180 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:37:20,683 WARN L180 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:37:21,022 WARN L180 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:37:21,317 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:37:21,610 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:37:21,891 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:37:22,177 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:37:22,481 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:37:22,779 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:37:23,083 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:37:23,403 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:37:23,705 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:37:24,008 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:37:24,318 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:37:24,630 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:37:24,949 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:37:25,260 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:37:25,577 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:37:25,915 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:37:26,257 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:37:26,572 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:37:26,878 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:37:27,190 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:37:27,504 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:37:27,817 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:37:28,129 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:37:28,440 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:37:28,748 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:37:29,047 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:37:29,359 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:37:29,663 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:37:29,959 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:37:40,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:37:40,051 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2018-12-03 16:37:40,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-12-03 16:37:40,052 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 88 [2018-12-03 16:37:40,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:37:40,053 INFO L225 Difference]: With dead ends: 93 [2018-12-03 16:37:40,053 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 16:37:40,054 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 257 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3741 ImplicationChecksByTransitivity, 35.5s TimeCoverageRelationStatistics Valid=25761, Invalid=41061, Unknown=0, NotChecked=0, Total=66822 [2018-12-03 16:37:40,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 16:37:40,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-12-03 16:37:40,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-12-03 16:37:40,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2018-12-03 16:37:40,059 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2018-12-03 16:37:40,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:37:40,059 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2018-12-03 16:37:40,059 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 16:37:40,060 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2018-12-03 16:37:40,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-12-03 16:37:40,060 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:37:40,060 INFO L402 BasicCegarLoop]: trace histogram [87, 1, 1, 1] [2018-12-03 16:37:40,060 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:37:40,060 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:37:40,060 INFO L82 PathProgramCache]: Analyzing trace with hash -464969204, now seen corresponding path program 44 times [2018-12-03 16:37:40,061 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:37:40,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:37:40,061 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:37:40,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:37:40,061 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:37:40,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:37:44,479 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 16:37:44,480 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:37:44,480 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:37:44,480 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:37:44,480 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:37:44,480 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:37:44,480 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 16:37:44,490 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:37:44,491 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:37:44,557 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-12-03 16:37:44,557 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:37:44,564 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:37:44,696 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 16:37:44,696 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:37:55,545 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 16:37:55,566 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:37:55,567 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 177 [2018-12-03 16:37:55,567 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:37:55,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2018-12-03 16:37:55,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2018-12-03 16:37:55,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11664, Invalid=19842, Unknown=0, NotChecked=0, Total=31506 [2018-12-03 16:37:55,568 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 91 states. [2018-12-03 16:37:55,860 WARN L180 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 8 [2018-12-03 16:37:56,149 WARN L180 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 9 [2018-12-03 16:37:56,438 WARN L180 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 16:37:56,777 WARN L180 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 16:37:57,074 WARN L180 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 16:37:57,357 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 16:37:57,650 WARN L180 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 16:37:57,941 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 16:37:58,235 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:37:58,530 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:37:58,843 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:37:59,153 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:37:59,464 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:37:59,760 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:38:00,079 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:38:00,380 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:38:00,692 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:38:01,007 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:38:01,335 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:38:01,667 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:38:02,001 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:38:02,321 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:38:02,648 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:38:02,960 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:38:03,287 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:38:03,604 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:38:03,928 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:38:04,259 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:38:04,571 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:38:04,887 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:38:05,205 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:38:05,529 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:38:05,842 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:38:06,154 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:38:06,459 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:38:06,773 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:38:07,103 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:38:07,397 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:38:07,688 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:38:07,991 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:38:08,554 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:38:18,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:38:18,541 INFO L93 Difference]: Finished difference Result 95 states and 96 transitions. [2018-12-03 16:38:18,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 16:38:18,542 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 90 [2018-12-03 16:38:18,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:38:18,543 INFO L225 Difference]: With dead ends: 95 [2018-12-03 16:38:18,543 INFO L226 Difference]: Without dead ends: 93 [2018-12-03 16:38:18,544 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 263 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3916 ImplicationChecksByTransitivity, 37.3s TimeCoverageRelationStatistics Valid=26976, Invalid=42984, Unknown=0, NotChecked=0, Total=69960 [2018-12-03 16:38:18,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-12-03 16:38:18,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-12-03 16:38:18,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-12-03 16:38:18,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-12-03 16:38:18,551 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2018-12-03 16:38:18,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:38:18,552 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-12-03 16:38:18,552 INFO L481 AbstractCegarLoop]: Interpolant automaton has 91 states. [2018-12-03 16:38:18,552 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-12-03 16:38:18,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-12-03 16:38:18,552 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:38:18,552 INFO L402 BasicCegarLoop]: trace histogram [89, 1, 1, 1] [2018-12-03 16:38:18,553 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:38:18,553 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:38:18,553 INFO L82 PathProgramCache]: Analyzing trace with hash -158748436, now seen corresponding path program 45 times [2018-12-03 16:38:18,553 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:38:18,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:38:18,554 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:38:18,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:38:18,554 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:38:19,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:38:23,080 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 16:38:23,081 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:38:23,081 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:38:23,081 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:38:23,081 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:38:23,081 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:38:23,081 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 16:38:23,090 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:38:23,090 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:38:23,674 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:38:23,674 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:38:24,030 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:38:24,155 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 16:38:24,155 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:38:35,414 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 16:38:35,432 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:38:35,433 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 181 [2018-12-03 16:38:35,433 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:38:35,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2018-12-03 16:38:35,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2018-12-03 16:38:35,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12199, Invalid=20743, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 16:38:35,435 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 93 states. [2018-12-03 16:38:35,764 WARN L180 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 8 [2018-12-03 16:38:36,055 WARN L180 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 9 [2018-12-03 16:38:36,350 WARN L180 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 16:38:36,663 WARN L180 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 16:38:36,976 WARN L180 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 16:38:37,277 WARN L180 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 16:38:37,600 WARN L180 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 16:38:37,919 WARN L180 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 16:38:38,227 WARN L180 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 16:38:38,550 WARN L180 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 16:38:38,871 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:38:39,176 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:38:39,465 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:38:39,778 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:38:40,107 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:38:40,430 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:38:40,768 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:38:41,100 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:38:41,443 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:38:41,773 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:38:42,111 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:38:42,443 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:38:42,791 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:38:43,141 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:38:43,470 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:38:43,808 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:38:44,148 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:38:44,489 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:38:44,819 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:38:45,143 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:38:45,471 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:38:45,813 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:38:46,129 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:38:46,447 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:38:46,765 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:38:47,081 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:38:47,399 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:38:47,729 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:38:48,058 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:38:48,364 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:38:48,680 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:38:48,981 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:38:59,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:38:59,989 INFO L93 Difference]: Finished difference Result 97 states and 98 transitions. [2018-12-03 16:38:59,989 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-12-03 16:38:59,989 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 92 [2018-12-03 16:38:59,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:38:59,990 INFO L225 Difference]: With dead ends: 97 [2018-12-03 16:38:59,990 INFO L226 Difference]: Without dead ends: 95 [2018-12-03 16:38:59,995 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 269 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4095 ImplicationChecksByTransitivity, 39.3s TimeCoverageRelationStatistics Valid=28219, Invalid=44951, Unknown=0, NotChecked=0, Total=73170 [2018-12-03 16:38:59,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-12-03 16:39:00,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2018-12-03 16:39:00,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-12-03 16:39:00,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2018-12-03 16:39:00,002 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2018-12-03 16:39:00,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:39:00,002 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2018-12-03 16:39:00,002 INFO L481 AbstractCegarLoop]: Interpolant automaton has 93 states. [2018-12-03 16:39:00,002 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2018-12-03 16:39:00,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-12-03 16:39:00,002 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:39:00,003 INFO L402 BasicCegarLoop]: trace histogram [91, 1, 1, 1] [2018-12-03 16:39:00,003 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:39:00,003 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:39:00,003 INFO L82 PathProgramCache]: Analyzing trace with hash 2061633484, now seen corresponding path program 46 times [2018-12-03 16:39:00,003 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:39:00,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:39:00,004 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:39:00,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:39:00,004 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:39:00,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:39:06,723 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 16:39:06,723 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:39:06,724 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:39:06,724 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:39:06,724 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:39:06,724 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:39:06,724 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 16:39:06,733 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:39:06,733 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:39:07,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:39:07,728 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:39:07,938 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 16:39:07,938 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:39:19,733 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 16:39:19,751 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:39:19,751 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 185 [2018-12-03 16:39:19,752 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:39:19,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 16:39:19,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 16:39:19,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12746, Invalid=21664, Unknown=0, NotChecked=0, Total=34410 [2018-12-03 16:39:19,754 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 95 states. [2018-12-03 16:39:20,057 WARN L180 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 8 [2018-12-03 16:39:20,367 WARN L180 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 9 [2018-12-03 16:39:20,676 WARN L180 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 16:39:21,015 WARN L180 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 16:39:21,331 WARN L180 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 16:39:21,633 WARN L180 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 16:39:21,944 WARN L180 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 16:39:22,255 WARN L180 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 16:39:22,579 WARN L180 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 16:39:22,893 WARN L180 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 16:39:23,213 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 16:39:23,540 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 16:39:23,885 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:39:24,206 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:39:24,550 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:39:24,876 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:39:25,214 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:39:25,591 WARN L180 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:39:25,918 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:39:26,259 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:39:26,605 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:39:26,958 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:39:27,301 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:39:27,648 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:39:27,989 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:39:28,327 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:39:28,682 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:39:29,088 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:39:29,430 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:39:29,786 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:39:30,130 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:39:30,483 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:39:30,813 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:39:31,155 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:39:31,501 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:39:31,840 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:39:32,174 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:39:32,525 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:39:32,854 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:39:33,167 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:39:33,479 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:39:33,796 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:39:34,126 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:39:34,429 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:39:35,047 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:39:35,372 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 16:39:45,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:39:45,497 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-12-03 16:39:45,497 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 16:39:45,497 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 94 [2018-12-03 16:39:45,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:39:45,498 INFO L225 Difference]: With dead ends: 99 [2018-12-03 16:39:45,498 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 16:39:45,499 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 275 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4278 ImplicationChecksByTransitivity, 43.3s TimeCoverageRelationStatistics Valid=29490, Invalid=46962, Unknown=0, NotChecked=0, Total=76452 [2018-12-03 16:39:45,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 16:39:45,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-12-03 16:39:45,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-12-03 16:39:45,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2018-12-03 16:39:45,504 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2018-12-03 16:39:45,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:39:45,504 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2018-12-03 16:39:45,505 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 16:39:45,505 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2018-12-03 16:39:45,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-12-03 16:39:45,505 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:39:45,505 INFO L402 BasicCegarLoop]: trace histogram [93, 1, 1, 1] [2018-12-03 16:39:45,505 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:39:45,505 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:39:45,505 INFO L82 PathProgramCache]: Analyzing trace with hash 1249912492, now seen corresponding path program 47 times [2018-12-03 16:39:45,506 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:39:45,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:39:45,506 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:39:45,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:39:45,506 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:39:46,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:39:51,156 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 16:39:51,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:39:51,156 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:39:51,156 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:39:51,156 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:39:51,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:39:51,157 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 16:39:51,165 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:39:51,165 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:39:51,255 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-12-03 16:39:51,255 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:39:51,262 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:39:51,396 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 16:39:51,397 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:40:03,518 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 16:40:03,537 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:40:03,537 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 189 [2018-12-03 16:40:03,537 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:40:03,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 97 states [2018-12-03 16:40:03,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2018-12-03 16:40:03,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13305, Invalid=22605, Unknown=0, NotChecked=0, Total=35910 [2018-12-03 16:40:03,539 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 97 states. [2018-12-03 16:40:03,864 WARN L180 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 8 [2018-12-03 16:40:04,195 WARN L180 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 9 [2018-12-03 16:40:04,534 WARN L180 SmtUtils]: Spent 304.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 16:40:04,878 WARN L180 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 16:40:05,204 WARN L180 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 16:40:05,518 WARN L180 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 16:40:05,840 WARN L180 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 16:40:06,178 WARN L180 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 16:40:06,514 WARN L180 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 16:40:06,840 WARN L180 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 16:40:07,172 WARN L180 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 16:40:07,543 WARN L180 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 16:40:07,875 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 16:40:08,220 WARN L180 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 16:40:08,562 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:40:08,904 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:40:09,239 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:40:09,600 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:40:09,962 WARN L180 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:40:10,325 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:40:10,675 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:40:11,026 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:40:11,380 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:40:11,731 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:40:12,092 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:40:12,460 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:40:12,817 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:40:13,173 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:40:13,530 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:40:13,884 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:40:14,239 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:40:14,592 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:40:14,987 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:40:15,343 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:40:15,696 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:40:16,051 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:40:16,403 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:40:16,748 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:40:17,094 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:40:17,427 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:40:17,762 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:40:18,082 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:40:18,403 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:40:18,722 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:40:19,049 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:40:19,379 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:40:19,705 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:40:20,062 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 16:40:20,382 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 16:40:31,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:40:31,056 INFO L93 Difference]: Finished difference Result 101 states and 102 transitions. [2018-12-03 16:40:31,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-12-03 16:40:31,056 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 96 [2018-12-03 16:40:31,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:40:31,057 INFO L225 Difference]: With dead ends: 101 [2018-12-03 16:40:31,057 INFO L226 Difference]: Without dead ends: 99 [2018-12-03 16:40:31,060 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 281 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4465 ImplicationChecksByTransitivity, 44.2s TimeCoverageRelationStatistics Valid=30789, Invalid=49017, Unknown=0, NotChecked=0, Total=79806 [2018-12-03 16:40:31,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-12-03 16:40:31,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-12-03 16:40:31,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-12-03 16:40:31,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-12-03 16:40:31,065 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2018-12-03 16:40:31,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:40:31,066 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-12-03 16:40:31,066 INFO L481 AbstractCegarLoop]: Interpolant automaton has 97 states. [2018-12-03 16:40:31,066 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-12-03 16:40:31,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-12-03 16:40:31,066 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:40:31,066 INFO L402 BasicCegarLoop]: trace histogram [95, 1, 1, 1] [2018-12-03 16:40:31,067 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:40:31,067 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:40:31,067 INFO L82 PathProgramCache]: Analyzing trace with hash -1424880244, now seen corresponding path program 48 times [2018-12-03 16:40:31,067 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:40:31,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:40:31,068 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:40:31,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:40:31,068 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:40:31,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:40:36,133 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 16:40:36,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:40:36,134 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:40:36,134 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:40:36,134 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:40:36,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:40:36,134 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 16:40:36,142 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:40:36,143 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:40:36,837 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:40:36,837 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:40:37,260 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:40:37,467 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 16:40:37,467 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:40:50,075 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 16:40:50,094 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:40:50,094 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 193 [2018-12-03 16:40:50,094 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:40:50,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-12-03 16:40:50,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-12-03 16:40:50,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13876, Invalid=23566, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 16:40:50,096 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 99 states. [2018-12-03 16:40:50,438 WARN L180 SmtUtils]: Spent 293.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 8 [2018-12-03 16:40:50,778 WARN L180 SmtUtils]: Spent 316.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 9 [2018-12-03 16:40:51,120 WARN L180 SmtUtils]: Spent 308.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2018-12-03 16:40:51,438 WARN L180 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2018-12-03 16:40:51,769 WARN L180 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 16:40:52,091 WARN L180 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 16:40:52,436 WARN L180 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 16:40:52,770 WARN L180 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 16:40:53,108 WARN L180 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 16:40:53,447 WARN L180 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 16:40:53,778 WARN L180 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 16:40:54,127 WARN L180 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 16:40:54,469 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 16:40:54,806 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 16:40:55,164 WARN L180 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 16:40:55,516 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 16:40:55,887 WARN L180 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:40:56,264 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:40:56,621 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:40:56,990 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:40:57,375 WARN L180 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:40:57,736 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:40:58,110 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:40:58,479 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:40:58,850 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:40:59,221 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:40:59,586 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:40:59,960 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:41:00,332 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:41:00,690 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:41:01,104 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:41:01,481 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:41:01,842 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:41:02,202 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:41:02,564 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:41:02,933 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:41:03,298 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:41:03,669 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:41:04,023 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:41:04,356 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:41:04,687 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:41:05,031 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:41:05,370 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:41:05,699 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 16:41:06,060 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 16:41:06,397 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 16:41:06,727 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 16:41:07,075 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 16:41:07,402 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 16:41:18,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:41:18,675 INFO L93 Difference]: Finished difference Result 103 states and 104 transitions. [2018-12-03 16:41:18,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 16:41:18,675 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 98 [2018-12-03 16:41:18,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:41:18,676 INFO L225 Difference]: With dead ends: 103 [2018-12-03 16:41:18,676 INFO L226 Difference]: Without dead ends: 101 [2018-12-03 16:41:18,678 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 287 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4656 ImplicationChecksByTransitivity, 45.2s TimeCoverageRelationStatistics Valid=32116, Invalid=51116, Unknown=0, NotChecked=0, Total=83232 [2018-12-03 16:41:18,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2018-12-03 16:41:18,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2018-12-03 16:41:18,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-12-03 16:41:18,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2018-12-03 16:41:18,684 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2018-12-03 16:41:18,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:41:18,684 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2018-12-03 16:41:18,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-12-03 16:41:18,685 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2018-12-03 16:41:18,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-12-03 16:41:18,685 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:41:18,685 INFO L402 BasicCegarLoop]: trace histogram [97, 1, 1, 1] [2018-12-03 16:41:18,685 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:41:18,685 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:41:18,685 INFO L82 PathProgramCache]: Analyzing trace with hash 784710764, now seen corresponding path program 49 times [2018-12-03 16:41:18,686 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:41:18,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:41:18,686 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:41:18,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:41:18,687 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:41:19,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:41:23,946 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 16:41:23,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:41:23,946 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:41:23,947 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:41:23,947 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:41:23,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:41:23,947 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 16:41:23,956 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:41:23,956 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:41:24,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:41:25,260 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:41:26,475 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 16:41:26,476 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:41:39,860 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 16:41:39,879 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:41:39,879 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 197 [2018-12-03 16:41:39,879 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:41:39,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 16:41:39,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 16:41:39,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14459, Invalid=24547, Unknown=0, NotChecked=0, Total=39006 [2018-12-03 16:41:39,881 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 101 states. [2018-12-03 16:41:40,220 WARN L180 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 8 [2018-12-03 16:41:40,574 WARN L180 SmtUtils]: Spent 328.00 ms on a formula simplification. DAG size of input: 297 DAG size of output: 9 [2018-12-03 16:41:40,909 WARN L180 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2018-12-03 16:41:41,249 WARN L180 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2018-12-03 16:41:41,598 WARN L180 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2018-12-03 16:41:41,949 WARN L180 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2018-12-03 16:41:42,306 WARN L180 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 16:41:42,661 WARN L180 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 16:41:43,014 WARN L180 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 16:41:43,369 WARN L180 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 16:41:43,720 WARN L180 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 16:41:44,068 WARN L180 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 16:41:44,415 WARN L180 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 16:41:44,785 WARN L180 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 16:41:45,151 WARN L180 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 16:41:45,527 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 16:41:45,897 WARN L180 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 16:41:46,266 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 16:41:46,638 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 16:41:47,055 WARN L180 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 16:41:47,441 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 16:41:47,816 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 16:41:48,199 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 16:41:48,575 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 16:41:48,940 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 16:41:49,317 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 16:41:49,727 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 16:41:50,114 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 16:41:50,489 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 16:41:50,870 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 16:41:51,253 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 16:41:51,634 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 16:41:52,011 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 16:41:52,437 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 16:41:52,810 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 16:41:53,176 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 16:41:53,543 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 16:41:53,917 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 16:41:54,285 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 16:41:54,651 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 16:41:54,999 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 16:41:55,374 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 16:41:55,731 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 16:41:56,073 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 16:41:56,412 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 16:41:56,762 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11