java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_compound_exp_cong.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/count_by_k.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 15:25:11,835 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 15:25:11,837 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 15:25:11,855 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2018-12-03 15:25:11,909 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_compound_exp_cong.epf [2018-12-03 15:25:11,924 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 15:25:11,924 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 15:25:11,928 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 15:25:11,929 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 15:25:11,929 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 15:25:11,929 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 15:25:11,929 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 15:25:11,929 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 15:25:11,930 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-03 15:25:11,930 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 15:25:11,930 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-03 15:25:11,930 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 15:25:11,930 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 15:25:11,930 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 15:25:11,931 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 15:25:11,932 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 15:25:11,932 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 15:25:11,932 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 15:25:11,932 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 15:25:11,934 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 15:25:11,934 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 15:25:11,935 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 15:25:11,935 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 15:25:11,935 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 15:25:11,935 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 15:25:11,935 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 15:25:11,936 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 15:25:11,937 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 15:25:11,937 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 15:25:11,937 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 15:25:11,937 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 15:25:11,937 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 15:25:11,938 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 15:25:11,938 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 15:25:11,938 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 15:25:11,938 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 15:25:11,938 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 15:25:11,939 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 15:25:11,939 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 15:25:11,939 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 15:25:11,939 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 15:25:11,973 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 15:25:11,986 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 15:25:11,989 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 15:25:11,991 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 15:25:11,991 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 15:25:11,992 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/count_by_k.i_3.bpl [2018-12-03 15:25:11,993 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/count_by_k.i_3.bpl' [2018-12-03 15:25:12,030 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 15:25:12,032 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 15:25:12,032 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 15:25:12,033 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 15:25:12,033 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 15:25:12,050 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 03:25:12" (1/1) ... [2018-12-03 15:25:12,061 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 03:25:12" (1/1) ... [2018-12-03 15:25:12,069 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 15:25:12,070 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 15:25:12,071 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 15:25:12,071 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 15:25:12,082 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 03:25:12" (1/1) ... [2018-12-03 15:25:12,083 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 03:25:12" (1/1) ... [2018-12-03 15:25:12,084 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 03:25:12" (1/1) ... [2018-12-03 15:25:12,084 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 03:25:12" (1/1) ... [2018-12-03 15:25:12,087 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 03:25:12" (1/1) ... [2018-12-03 15:25:12,089 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 03:25:12" (1/1) ... [2018-12-03 15:25:12,090 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 03:25:12" (1/1) ... [2018-12-03 15:25:12,091 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 15:25:12,092 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 15:25:12,092 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 15:25:12,092 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 15:25:12,093 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 03:25:12" (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 15:25:12,167 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 15:25:12,167 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 15:25:12,413 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 15:25:12,413 INFO L280 CfgBuilder]: Removed 1 assue(true) statements. [2018-12-03 15:25:12,414 INFO L202 PluginConnector]: Adding new model count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 03:25:12 BoogieIcfgContainer [2018-12-03 15:25:12,414 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 15:25:12,415 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 15:25:12,415 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 15:25:12,419 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 15:25:12,419 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 03:25:12" (1/2) ... [2018-12-03 15:25:12,420 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25a20120 and model type count_by_k.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 03:25:12, skipping insertion in model container [2018-12-03 15:25:12,420 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 03:25:12" (2/2) ... [2018-12-03 15:25:12,422 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k.i_3.bpl [2018-12-03 15:25:12,432 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 15:25:12,439 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 15:25:12,454 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 15:25:12,484 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 15:25:12,484 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 15:25:12,484 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 15:25:12,484 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 15:25:12,484 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 15:25:12,485 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 15:25:12,485 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 15:25:12,485 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 15:25:12,500 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-12-03 15:25:12,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-12-03 15:25:12,510 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:12,511 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-12-03 15:25:12,514 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:12,520 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:12,520 INFO L82 PathProgramCache]: Analyzing trace with hash 29955, now seen corresponding path program 1 times [2018-12-03 15:25:12,523 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:12,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:12,566 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:25:12,566 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:12,566 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:12,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:12,719 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 15:25:12,721 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 15:25:12,722 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-03 15:25:12,722 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 15:25:12,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 15:25:12,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 15:25:12,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 15:25:12,741 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-12-03 15:25:12,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:12,793 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2018-12-03 15:25:12,794 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 15:25:12,796 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-12-03 15:25:12,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:12,814 INFO L225 Difference]: With dead ends: 9 [2018-12-03 15:25:12,814 INFO L226 Difference]: Without dead ends: 5 [2018-12-03 15:25:12,823 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 15:25:12,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states. [2018-12-03 15:25:12,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2018-12-03 15:25:12,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2018-12-03 15:25:12,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 5 transitions. [2018-12-03 15:25:12,890 INFO L78 Accepts]: Start accepts. Automaton has 5 states and 5 transitions. Word has length 3 [2018-12-03 15:25:12,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:12,890 INFO L480 AbstractCegarLoop]: Abstraction has 5 states and 5 transitions. [2018-12-03 15:25:12,890 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 15:25:12,891 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 5 transitions. [2018-12-03 15:25:12,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-03 15:25:12,891 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:12,891 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-12-03 15:25:12,892 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:12,892 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:12,892 INFO L82 PathProgramCache]: Analyzing trace with hash 930412, now seen corresponding path program 1 times [2018-12-03 15:25:12,892 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:12,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:12,894 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:25:12,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:12,894 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:12,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:12,991 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 15:25:12,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:12,993 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:12,994 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 5 with the following transitions: [2018-12-03 15:25:12,995 INFO L205 CegarAbsIntRunner]: [0], [5], [7], [9] [2018-12-03 15:25:13,040 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 15:25:13,040 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 15:25:13,272 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 15:25:13,277 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 15:25:13,321 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:13,323 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 15:25:13,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:13,323 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 15:25:13,343 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:25:13,344 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:25:13,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:13,387 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:13,468 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 15:25:13,469 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:13,570 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 15:25:13,590 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:13,591 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2018-12-03 15:25:13,591 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:13,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 15:25:13,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 15:25:13,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-03 15:25:13,592 INFO L87 Difference]: Start difference. First operand 5 states and 5 transitions. Second operand 5 states. [2018-12-03 15:25:13,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:13,629 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2018-12-03 15:25:13,632 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 15:25:13,632 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 4 [2018-12-03 15:25:13,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:13,633 INFO L225 Difference]: With dead ends: 9 [2018-12-03 15:25:13,633 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 15:25:13,634 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-03 15:25:13,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 15:25:13,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-12-03 15:25:13,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 15:25:13,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-12-03 15:25:13,639 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-12-03 15:25:13,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:13,640 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-12-03 15:25:13,640 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 15:25:13,640 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-12-03 15:25:13,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 15:25:13,640 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:13,642 INFO L402 BasicCegarLoop]: trace histogram [3, 1, 1, 1] [2018-12-03 15:25:13,642 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:13,643 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:13,643 INFO L82 PathProgramCache]: Analyzing trace with hash 894183756, now seen corresponding path program 2 times [2018-12-03 15:25:13,643 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:13,645 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:13,645 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:25:13,645 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:13,645 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:13,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:13,760 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 15:25:13,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:13,761 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:13,761 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:25:13,761 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:25:13,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:13,762 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 15:25:13,777 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:25:13,777 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:25:13,798 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-03 15:25:13,798 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:25:13,799 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:13,923 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 15:25:13,923 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:14,136 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 15:25:14,162 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:14,162 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-12-03 15:25:14,163 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:14,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 15:25:14,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 15:25:14,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2018-12-03 15:25:14,164 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 7 states. [2018-12-03 15:25:14,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:14,421 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-12-03 15:25:14,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 15:25:14,421 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 6 [2018-12-03 15:25:14,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:14,422 INFO L225 Difference]: With dead ends: 11 [2018-12-03 15:25:14,422 INFO L226 Difference]: Without dead ends: 9 [2018-12-03 15:25:14,423 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2018-12-03 15:25:14,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-12-03 15:25:14,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-12-03 15:25:14,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-12-03 15:25:14,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-12-03 15:25:14,427 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-12-03 15:25:14,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:14,427 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-12-03 15:25:14,427 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 15:25:14,427 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-12-03 15:25:14,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-03 15:25:14,428 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:14,428 INFO L402 BasicCegarLoop]: trace histogram [5, 1, 1, 1] [2018-12-03 15:25:14,429 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:14,429 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:14,429 INFO L82 PathProgramCache]: Analyzing trace with hash 317188140, now seen corresponding path program 3 times [2018-12-03 15:25:14,429 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:14,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:14,430 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:25:14,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:14,430 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:14,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:14,571 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 15:25:14,572 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:14,573 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:14,573 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:25:14,573 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:25:14,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:14,573 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 15:25:14,583 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:25:14,583 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:25:14,594 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:25:14,594 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:25:14,596 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:14,632 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 15:25:14,633 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:15,186 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 15:25:15,217 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:15,217 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-12-03 15:25:15,218 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:15,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-03 15:25:15,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-03 15:25:15,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-12-03 15:25:15,219 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 9 states. [2018-12-03 15:25:15,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:15,461 INFO L93 Difference]: Finished difference Result 13 states and 14 transitions. [2018-12-03 15:25:15,462 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 15:25:15,462 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 8 [2018-12-03 15:25:15,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:15,463 INFO L225 Difference]: With dead ends: 13 [2018-12-03 15:25:15,463 INFO L226 Difference]: Without dead ends: 11 [2018-12-03 15:25:15,464 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 15:25:15,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-12-03 15:25:15,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-12-03 15:25:15,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-12-03 15:25:15,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-12-03 15:25:15,467 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-12-03 15:25:15,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:15,468 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-12-03 15:25:15,468 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-03 15:25:15,468 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-12-03 15:25:15,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-03 15:25:15,469 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:15,469 INFO L402 BasicCegarLoop]: trace histogram [7, 1, 1, 1] [2018-12-03 15:25:15,469 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:15,470 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:15,470 INFO L82 PathProgramCache]: Analyzing trace with hash -124817652, now seen corresponding path program 4 times [2018-12-03 15:25:15,470 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:15,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:15,471 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:25:15,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:15,471 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:15,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:15,785 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 15:25:15,785 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:15,785 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:15,786 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:25:15,786 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:25:15,786 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:15,786 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 15:25:15,795 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:25:15,796 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:25:15,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:15,807 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:15,848 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 15:25:15,848 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:16,101 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 15:25:16,122 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:16,123 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2018-12-03 15:25:16,123 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:16,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 15:25:16,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 15:25:16,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2018-12-03 15:25:16,124 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 11 states. [2018-12-03 15:25:16,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:16,381 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2018-12-03 15:25:16,381 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 15:25:16,381 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 10 [2018-12-03 15:25:16,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:16,382 INFO L225 Difference]: With dead ends: 15 [2018-12-03 15:25:16,382 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 15:25:16,383 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=216, Invalid=384, Unknown=0, NotChecked=0, Total=600 [2018-12-03 15:25:16,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 15:25:16,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-12-03 15:25:16,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-12-03 15:25:16,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-12-03 15:25:16,387 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-12-03 15:25:16,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:16,388 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-12-03 15:25:16,388 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 15:25:16,388 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-12-03 15:25:16,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 15:25:16,388 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:16,389 INFO L402 BasicCegarLoop]: trace histogram [9, 1, 1, 1] [2018-12-03 15:25:16,389 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:16,389 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:16,389 INFO L82 PathProgramCache]: Analyzing trace with hash 309378540, now seen corresponding path program 5 times [2018-12-03 15:25:16,389 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:16,390 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:16,391 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:25:16,391 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:16,391 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:16,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:16,897 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 15:25:16,898 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:16,898 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:16,898 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:25:16,898 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:25:16,898 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:16,898 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 15:25:16,912 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:25:16,912 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:25:16,927 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-03 15:25:16,927 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:25:16,930 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:16,963 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 15:25:16,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:17,277 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 15:25:17,296 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:17,296 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-12-03 15:25:17,296 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:17,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 15:25:17,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 15:25:17,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=303, Unknown=0, NotChecked=0, Total=462 [2018-12-03 15:25:17,298 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 13 states. [2018-12-03 15:25:17,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:17,662 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2018-12-03 15:25:17,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 15:25:17,669 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 12 [2018-12-03 15:25:17,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:17,670 INFO L225 Difference]: With dead ends: 17 [2018-12-03 15:25:17,670 INFO L226 Difference]: Without dead ends: 15 [2018-12-03 15:25:17,671 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=339, Invalid=591, Unknown=0, NotChecked=0, Total=930 [2018-12-03 15:25:17,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-12-03 15:25:17,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-12-03 15:25:17,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-03 15:25:17,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-12-03 15:25:17,675 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-12-03 15:25:17,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:17,675 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-12-03 15:25:17,676 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 15:25:17,676 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-12-03 15:25:17,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-03 15:25:17,676 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:17,676 INFO L402 BasicCegarLoop]: trace histogram [11, 1, 1, 1] [2018-12-03 15:25:17,677 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:17,677 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:17,677 INFO L82 PathProgramCache]: Analyzing trace with hash 960091340, now seen corresponding path program 6 times [2018-12-03 15:25:17,677 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:17,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:17,678 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:25:17,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:17,678 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:17,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:17,966 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 15:25:17,967 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:17,967 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:17,967 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:25:17,967 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:25:17,968 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:17,968 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 15:25:17,983 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:25:17,983 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:25:18,016 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:25:18,016 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:25:18,019 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:18,078 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 15:25:18,079 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:18,469 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 15:25:18,488 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:18,488 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-12-03 15:25:18,488 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:18,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 15:25:18,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 15:25:18,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2018-12-03 15:25:18,490 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 15 states. [2018-12-03 15:25:19,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:19,166 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2018-12-03 15:25:19,168 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 15:25:19,168 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 14 [2018-12-03 15:25:19,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:19,169 INFO L225 Difference]: With dead ends: 19 [2018-12-03 15:25:19,169 INFO L226 Difference]: Without dead ends: 17 [2018-12-03 15:25:19,170 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=490, Invalid=842, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 15:25:19,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-12-03 15:25:19,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-12-03 15:25:19,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-12-03 15:25:19,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-12-03 15:25:19,174 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-12-03 15:25:19,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:19,174 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-12-03 15:25:19,174 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 15:25:19,174 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-12-03 15:25:19,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 15:25:19,175 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:19,175 INFO L402 BasicCegarLoop]: trace histogram [13, 1, 1, 1] [2018-12-03 15:25:19,175 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:19,175 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:19,175 INFO L82 PathProgramCache]: Analyzing trace with hash -770133076, now seen corresponding path program 7 times [2018-12-03 15:25:19,176 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:19,176 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:19,176 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:25:19,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:19,177 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:19,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:19,427 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 15:25:19,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:19,427 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:19,427 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:25:19,428 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:25:19,428 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:19,428 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 15:25:19,440 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:25:19,440 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:25:19,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:19,464 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:19,522 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 15:25:19,522 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:19,991 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 15:25:20,009 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:20,009 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2018-12-03 15:25:20,010 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:20,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 15:25:20,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 15:25:20,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=565, Unknown=0, NotChecked=0, Total=870 [2018-12-03 15:25:20,011 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 17 states. [2018-12-03 15:25:20,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:20,547 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2018-12-03 15:25:20,547 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 15:25:20,547 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 16 [2018-12-03 15:25:20,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:20,548 INFO L225 Difference]: With dead ends: 21 [2018-12-03 15:25:20,548 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 15:25:20,549 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=669, Invalid=1137, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 15:25:20,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 15:25:20,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-12-03 15:25:20,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 15:25:20,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-12-03 15:25:20,554 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-12-03 15:25:20,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:20,554 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-12-03 15:25:20,554 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 15:25:20,554 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-12-03 15:25:20,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 15:25:20,555 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:20,555 INFO L402 BasicCegarLoop]: trace histogram [15, 1, 1, 1] [2018-12-03 15:25:20,555 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:20,556 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:20,556 INFO L82 PathProgramCache]: Analyzing trace with hash -1363453300, now seen corresponding path program 8 times [2018-12-03 15:25:20,556 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:20,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:20,557 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:25:20,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:20,557 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:20,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:20,838 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 15:25:20,839 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:20,839 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:20,839 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:25:20,839 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:25:20,839 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:20,840 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 15:25:20,850 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:25:20,851 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:25:20,866 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-03 15:25:20,866 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:25:20,869 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:20,918 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 15:25:20,918 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:21,648 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 15:25:21,669 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:21,669 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-12-03 15:25:21,670 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:21,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 15:25:21,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 15:25:21,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=396, Invalid=726, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 15:25:21,672 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 19 states. [2018-12-03 15:25:22,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:22,421 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2018-12-03 15:25:22,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 15:25:22,422 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 18 [2018-12-03 15:25:22,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:22,423 INFO L225 Difference]: With dead ends: 23 [2018-12-03 15:25:22,423 INFO L226 Difference]: Without dead ends: 21 [2018-12-03 15:25:22,424 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=876, Invalid=1476, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 15:25:22,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-12-03 15:25:22,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-12-03 15:25:22,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 15:25:22,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-12-03 15:25:22,428 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-12-03 15:25:22,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:22,428 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-12-03 15:25:22,429 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 15:25:22,429 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-12-03 15:25:22,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 15:25:22,429 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:22,429 INFO L402 BasicCegarLoop]: trace histogram [17, 1, 1, 1] [2018-12-03 15:25:22,430 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:22,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:22,430 INFO L82 PathProgramCache]: Analyzing trace with hash -313538196, now seen corresponding path program 9 times [2018-12-03 15:25:22,430 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:22,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:22,431 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:25:22,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:22,431 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:22,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:23,037 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 15:25:23,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:23,037 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:23,037 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:25:23,038 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:25:23,038 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:23,038 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 15:25:23,048 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:25:23,048 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:25:23,067 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:25:23,067 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:25:23,073 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:23,183 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 15:25:23,183 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:23,873 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 15:25:23,891 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:23,891 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-12-03 15:25:23,891 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:23,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 15:25:23,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 15:25:23,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=499, Invalid=907, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 15:25:23,893 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 21 states. [2018-12-03 15:25:24,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:24,998 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-12-03 15:25:24,998 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 15:25:24,998 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 20 [2018-12-03 15:25:24,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:24,999 INFO L225 Difference]: With dead ends: 25 [2018-12-03 15:25:25,000 INFO L226 Difference]: Without dead ends: 23 [2018-12-03 15:25:25,001 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1111, Invalid=1859, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 15:25:25,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-12-03 15:25:25,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-12-03 15:25:25,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-12-03 15:25:25,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-12-03 15:25:25,006 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-12-03 15:25:25,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:25,006 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-12-03 15:25:25,006 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 15:25:25,007 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-12-03 15:25:25,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-12-03 15:25:25,007 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:25,007 INFO L402 BasicCegarLoop]: trace histogram [19, 1, 1, 1] [2018-12-03 15:25:25,008 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:25,008 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:25,008 INFO L82 PathProgramCache]: Analyzing trace with hash -662437812, now seen corresponding path program 10 times [2018-12-03 15:25:25,008 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:25,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:25,009 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:25:25,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:25,009 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:25,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:25,301 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 15:25:25,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:25,302 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:25,302 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:25:25,302 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:25:25,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:25,302 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 15:25:25,311 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:25:25,311 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:25:25,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:25,337 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:25,380 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 15:25:25,380 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:26,030 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 15:25:26,048 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:26,049 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2018-12-03 15:25:26,049 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:26,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 15:25:26,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 15:25:26,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=614, Invalid=1108, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 15:25:26,050 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 23 states. [2018-12-03 15:25:26,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:26,849 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2018-12-03 15:25:26,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 15:25:26,850 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 22 [2018-12-03 15:25:26,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:26,850 INFO L225 Difference]: With dead ends: 27 [2018-12-03 15:25:26,851 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 15:25:26,852 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1374, Invalid=2286, Unknown=0, NotChecked=0, Total=3660 [2018-12-03 15:25:26,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 15:25:26,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-12-03 15:25:26,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-03 15:25:26,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-12-03 15:25:26,856 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-12-03 15:25:26,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:26,856 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-12-03 15:25:26,856 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 15:25:26,856 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-12-03 15:25:26,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 15:25:26,857 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:26,857 INFO L402 BasicCegarLoop]: trace histogram [21, 1, 1, 1] [2018-12-03 15:25:26,857 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:26,857 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:26,857 INFO L82 PathProgramCache]: Analyzing trace with hash -947519700, now seen corresponding path program 11 times [2018-12-03 15:25:26,858 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:26,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:26,858 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:25:26,859 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:26,859 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:26,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:27,198 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 15:25:27,198 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:27,198 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:27,198 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:25:27,199 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:25:27,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:27,199 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 15:25:27,214 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:25:27,214 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:25:27,242 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-03 15:25:27,242 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:25:27,244 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:27,298 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 15:25:27,298 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:28,587 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 15:25:28,607 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:28,608 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-12-03 15:25:28,608 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:28,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-03 15:25:28,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-03 15:25:28,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=1329, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 15:25:28,609 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 25 states. [2018-12-03 15:25:29,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:29,909 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2018-12-03 15:25:29,911 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 15:25:29,911 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 24 [2018-12-03 15:25:29,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:29,912 INFO L225 Difference]: With dead ends: 29 [2018-12-03 15:25:29,912 INFO L226 Difference]: Without dead ends: 27 [2018-12-03 15:25:29,913 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1665, Invalid=2757, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 15:25:29,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-12-03 15:25:29,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-12-03 15:25:29,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-03 15:25:29,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-12-03 15:25:29,918 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-12-03 15:25:29,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:29,919 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-12-03 15:25:29,919 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-03 15:25:29,919 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-12-03 15:25:29,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-03 15:25:29,920 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:29,920 INFO L402 BasicCegarLoop]: trace histogram [23, 1, 1, 1] [2018-12-03 15:25:29,920 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:29,920 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:29,921 INFO L82 PathProgramCache]: Analyzing trace with hash -33307124, now seen corresponding path program 12 times [2018-12-03 15:25:29,921 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:29,921 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:29,921 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:25:29,922 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:29,922 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:29,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:30,384 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 15:25:30,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:30,385 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:30,385 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:25:30,385 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:25:30,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:30,386 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 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 15:25:30,394 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:25:30,394 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:25:30,443 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:25:30,443 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:25:30,456 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:30,666 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 15:25:30,666 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:31,642 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 15:25:31,671 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:31,671 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-12-03 15:25:31,671 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:31,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 15:25:31,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 15:25:31,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=880, Invalid=1570, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 15:25:31,674 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 27 states. [2018-12-03 15:25:33,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:33,004 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-12-03 15:25:33,005 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 15:25:33,005 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 26 [2018-12-03 15:25:33,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:33,006 INFO L225 Difference]: With dead ends: 31 [2018-12-03 15:25:33,006 INFO L226 Difference]: Without dead ends: 29 [2018-12-03 15:25:33,008 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 15:25:33,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-12-03 15:25:33,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-12-03 15:25:33,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-12-03 15:25:33,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-12-03 15:25:33,013 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-12-03 15:25:33,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:33,013 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-12-03 15:25:33,013 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 15:25:33,013 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-12-03 15:25:33,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-12-03 15:25:33,014 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:33,014 INFO L402 BasicCegarLoop]: trace histogram [25, 1, 1, 1] [2018-12-03 15:25:33,015 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:33,015 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:33,015 INFO L82 PathProgramCache]: Analyzing trace with hash -1943317268, now seen corresponding path program 13 times [2018-12-03 15:25:33,015 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:33,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:33,016 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:25:33,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:33,016 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:33,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:33,467 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 15:25:33,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:33,467 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:33,468 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:25:33,468 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:25:33,468 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:33,468 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 15:25:33,477 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:25:33,477 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:25:33,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:33,517 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:33,616 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 15:25:33,616 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:34,976 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 15:25:34,994 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:34,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2018-12-03 15:25:34,994 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:34,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 15:25:34,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 15:25:34,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1031, Invalid=1831, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 15:25:34,996 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 29 states. [2018-12-03 15:25:35,285 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 11 [2018-12-03 15:25:36,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:36,594 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2018-12-03 15:25:36,595 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 15:25:36,595 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 28 [2018-12-03 15:25:36,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:36,596 INFO L225 Difference]: With dead ends: 33 [2018-12-03 15:25:36,596 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 15:25:36,598 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2331, Invalid=3831, Unknown=0, NotChecked=0, Total=6162 [2018-12-03 15:25:36,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 15:25:36,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-12-03 15:25:36,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-03 15:25:36,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-12-03 15:25:36,603 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-12-03 15:25:36,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:36,604 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-12-03 15:25:36,604 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 15:25:36,604 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-12-03 15:25:36,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-03 15:25:36,605 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:36,605 INFO L402 BasicCegarLoop]: trace histogram [27, 1, 1, 1] [2018-12-03 15:25:36,605 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:36,605 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:36,605 INFO L82 PathProgramCache]: Analyzing trace with hash 782937036, now seen corresponding path program 14 times [2018-12-03 15:25:36,606 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:36,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:36,606 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:25:36,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:36,607 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:36,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:37,096 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 15:25:37,096 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:37,096 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:37,097 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:25:37,097 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:25:37,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:37,097 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 15:25:37,107 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:25:37,107 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:25:37,127 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-03 15:25:37,127 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:25:37,131 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:37,176 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 15:25:37,177 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:39,554 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 15:25:39,573 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:39,574 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-12-03 15:25:39,574 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:39,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-12-03 15:25:39,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-12-03 15:25:39,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1194, Invalid=2112, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 15:25:39,576 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 31 states. [2018-12-03 15:25:41,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:41,244 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2018-12-03 15:25:41,244 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 15:25:41,244 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 30 [2018-12-03 15:25:41,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:41,245 INFO L225 Difference]: With dead ends: 35 [2018-12-03 15:25:41,245 INFO L226 Difference]: Without dead ends: 33 [2018-12-03 15:25:41,247 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=2706, Invalid=4434, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 15:25:41,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-03 15:25:41,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-12-03 15:25:41,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-03 15:25:41,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-12-03 15:25:41,253 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-12-03 15:25:41,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:41,253 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-12-03 15:25:41,253 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-12-03 15:25:41,253 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-12-03 15:25:41,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 15:25:41,254 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:41,254 INFO L402 BasicCegarLoop]: trace histogram [29, 1, 1, 1] [2018-12-03 15:25:41,254 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:41,255 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:41,255 INFO L82 PathProgramCache]: Analyzing trace with hash 783272620, now seen corresponding path program 15 times [2018-12-03 15:25:41,255 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:41,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:41,256 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:25:41,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:41,256 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:41,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:41,863 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 15:25:41,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:41,863 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:41,863 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:25:41,863 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:25:41,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:41,864 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 15:25:41,875 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:25:41,875 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:25:41,917 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:25:41,917 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:25:41,935 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:41,989 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 15:25:41,989 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:43,332 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 15:25:43,350 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:43,351 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-12-03 15:25:43,351 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:43,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-12-03 15:25:43,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-12-03 15:25:43,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1369, Invalid=2413, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 15:25:43,353 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 33 states. [2018-12-03 15:25:45,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:45,335 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-12-03 15:25:45,335 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 15:25:45,335 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 32 [2018-12-03 15:25:45,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:45,336 INFO L225 Difference]: With dead ends: 37 [2018-12-03 15:25:45,336 INFO L226 Difference]: Without dead ends: 35 [2018-12-03 15:25:45,339 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 465 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=3109, Invalid=5081, Unknown=0, NotChecked=0, Total=8190 [2018-12-03 15:25:45,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-12-03 15:25:45,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-12-03 15:25:45,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-12-03 15:25:45,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-12-03 15:25:45,345 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-12-03 15:25:45,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:45,345 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-12-03 15:25:45,345 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-12-03 15:25:45,345 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-12-03 15:25:45,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-12-03 15:25:45,346 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:45,346 INFO L402 BasicCegarLoop]: trace histogram [31, 1, 1, 1] [2018-12-03 15:25:45,346 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:45,346 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:45,347 INFO L82 PathProgramCache]: Analyzing trace with hash 1105768844, now seen corresponding path program 16 times [2018-12-03 15:25:45,347 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:45,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:45,347 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:25:45,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:45,348 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:45,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:45,982 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 15:25:45,982 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:45,983 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:45,983 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:25:45,983 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:25:45,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:45,983 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 15:25:45,992 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:25:45,993 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:25:46,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:46,068 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:46,144 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 15:25:46,144 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:47,724 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 15:25:47,742 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:47,743 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 65 [2018-12-03 15:25:47,743 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:47,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 15:25:47,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 15:25:47,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1556, Invalid=2734, Unknown=0, NotChecked=0, Total=4290 [2018-12-03 15:25:47,744 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 35 states. [2018-12-03 15:25:49,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:49,849 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-12-03 15:25:49,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 15:25:49,850 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 34 [2018-12-03 15:25:49,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:49,850 INFO L225 Difference]: With dead ends: 39 [2018-12-03 15:25:49,850 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 15:25:49,851 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 15:25:49,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 15:25:49,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-12-03 15:25:49,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-03 15:25:49,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-12-03 15:25:49,856 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-12-03 15:25:49,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:49,857 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-12-03 15:25:49,857 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 15:25:49,857 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-12-03 15:25:49,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-12-03 15:25:49,857 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:49,857 INFO L402 BasicCegarLoop]: trace histogram [33, 1, 1, 1] [2018-12-03 15:25:49,857 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:49,858 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:49,858 INFO L82 PathProgramCache]: Analyzing trace with hash 1786994796, now seen corresponding path program 17 times [2018-12-03 15:25:49,858 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:49,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:49,859 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:25:49,859 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:49,859 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:49,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:50,850 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 15:25:50,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:50,850 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:50,850 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:25:50,850 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:25:50,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:50,850 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 15:25:50,859 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:25:50,859 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:25:50,883 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-03 15:25:50,883 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:25:50,886 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:50,959 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 15:25:50,960 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:52,674 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 15:25:52,693 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:52,694 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-12-03 15:25:52,694 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:52,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-12-03 15:25:52,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-12-03 15:25:52,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1755, Invalid=3075, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 15:25:52,695 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 37 states. [2018-12-03 15:25:55,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:25:55,139 INFO L93 Difference]: Finished difference Result 41 states and 42 transitions. [2018-12-03 15:25:55,139 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 15:25:55,140 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 36 [2018-12-03 15:25:55,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:25:55,140 INFO L225 Difference]: With dead ends: 41 [2018-12-03 15:25:55,141 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 15:25:55,143 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 595 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=3999, Invalid=6507, Unknown=0, NotChecked=0, Total=10506 [2018-12-03 15:25:55,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 15:25:55,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-12-03 15:25:55,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-03 15:25:55,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-12-03 15:25:55,148 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-12-03 15:25:55,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:25:55,148 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-12-03 15:25:55,149 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-12-03 15:25:55,149 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-12-03 15:25:55,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 15:25:55,149 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:25:55,149 INFO L402 BasicCegarLoop]: trace histogram [35, 1, 1, 1] [2018-12-03 15:25:55,150 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:25:55,150 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:25:55,150 INFO L82 PathProgramCache]: Analyzing trace with hash -684861620, now seen corresponding path program 18 times [2018-12-03 15:25:55,150 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:25:55,151 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:55,151 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:25:55,151 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:25:55,151 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:25:55,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:25:56,087 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 15:25:56,088 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:56,088 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:25:56,088 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:25:56,088 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:25:56,088 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:25:56,088 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 15:25:56,097 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:25:56,097 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:25:56,154 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:25:56,154 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:25:56,182 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:25:56,247 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 15:25:56,247 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:25:58,135 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 15:25:58,157 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:25:58,157 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-12-03 15:25:58,157 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:25:58,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-12-03 15:25:58,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-12-03 15:25:58,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1966, Invalid=3436, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 15:25:58,159 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 39 states. [2018-12-03 15:26:01,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:26:01,048 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-12-03 15:26:01,049 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 15:26:01,049 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 38 [2018-12-03 15:26:01,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:26:01,050 INFO L225 Difference]: With dead ends: 43 [2018-12-03 15:26:01,050 INFO L226 Difference]: Without dead ends: 41 [2018-12-03 15:26:01,052 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=4486, Invalid=7286, Unknown=0, NotChecked=0, Total=11772 [2018-12-03 15:26:01,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-12-03 15:26:01,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-12-03 15:26:01,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-12-03 15:26:01,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-12-03 15:26:01,057 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-12-03 15:26:01,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:26:01,057 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-12-03 15:26:01,057 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-12-03 15:26:01,057 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-12-03 15:26:01,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-12-03 15:26:01,058 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:26:01,058 INFO L402 BasicCegarLoop]: trace histogram [37, 1, 1, 1] [2018-12-03 15:26:01,058 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:26:01,059 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:26:01,059 INFO L82 PathProgramCache]: Analyzing trace with hash -1021962708, now seen corresponding path program 19 times [2018-12-03 15:26:01,059 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:26:01,059 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:26:01,060 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:26:01,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:26:01,060 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:26:01,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:26:02,621 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 15:26:02,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:26:02,622 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:26:02,622 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:26:02,622 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:26:02,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:26:02,623 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 15:26:02,631 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:26:02,631 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:26:02,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:26:02,723 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:26:02,835 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 15:26:02,835 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:26:04,928 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 15:26:04,947 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:26:04,947 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 77 [2018-12-03 15:26:04,948 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:26:04,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 15:26:04,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 15:26:04,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2189, Invalid=3817, Unknown=0, NotChecked=0, Total=6006 [2018-12-03 15:26:04,949 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 41 states. [2018-12-03 15:26:07,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:26:07,982 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2018-12-03 15:26:07,982 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 15:26:07,982 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 40 [2018-12-03 15:26:07,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:26:07,983 INFO L225 Difference]: With dead ends: 45 [2018-12-03 15:26:07,983 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 15:26:07,985 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 741 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=5001, Invalid=8109, Unknown=0, NotChecked=0, Total=13110 [2018-12-03 15:26:07,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 15:26:07,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-12-03 15:26:07,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-12-03 15:26:07,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-12-03 15:26:07,991 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2018-12-03 15:26:07,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:26:07,991 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-12-03 15:26:07,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 15:26:07,991 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-12-03 15:26:07,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 15:26:07,992 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:26:07,992 INFO L402 BasicCegarLoop]: trace histogram [39, 1, 1, 1] [2018-12-03 15:26:07,992 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:26:07,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:26:07,993 INFO L82 PathProgramCache]: Analyzing trace with hash 1441406220, now seen corresponding path program 20 times [2018-12-03 15:26:07,993 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:26:07,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:26:07,994 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:26:07,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:26:07,994 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:26:08,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:26:08,922 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 15:26:08,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:26:08,922 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:26:08,923 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:26:08,923 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:26:08,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:26:08,923 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 15:26:08,932 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:26:08,932 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:26:08,958 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-12-03 15:26:08,958 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:26:08,961 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:26:09,028 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 15:26:09,028 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:26:11,626 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 15:26:11,646 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:26:11,647 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-12-03 15:26:11,647 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:26:11,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-12-03 15:26:11,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-12-03 15:26:11,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2424, Invalid=4218, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 15:26:11,648 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 43 states. [2018-12-03 15:26:15,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:26:15,027 INFO L93 Difference]: Finished difference Result 47 states and 48 transitions. [2018-12-03 15:26:15,027 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 15:26:15,028 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 42 [2018-12-03 15:26:15,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:26:15,028 INFO L225 Difference]: With dead ends: 47 [2018-12-03 15:26:15,028 INFO L226 Difference]: Without dead ends: 45 [2018-12-03 15:26:15,029 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 820 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=5544, Invalid=8976, Unknown=0, NotChecked=0, Total=14520 [2018-12-03 15:26:15,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-12-03 15:26:15,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-12-03 15:26:15,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 15:26:15,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-12-03 15:26:15,035 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2018-12-03 15:26:15,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:26:15,035 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-12-03 15:26:15,035 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-12-03 15:26:15,035 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-12-03 15:26:15,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-03 15:26:15,036 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:26:15,036 INFO L402 BasicCegarLoop]: trace histogram [41, 1, 1, 1] [2018-12-03 15:26:15,036 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:26:15,037 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:26:15,037 INFO L82 PathProgramCache]: Analyzing trace with hash -2083001364, now seen corresponding path program 21 times [2018-12-03 15:26:15,037 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:26:15,037 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:26:15,038 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:26:15,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:26:15,038 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:26:15,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:26:16,318 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 15:26:16,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:26:16,318 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:26:16,319 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:26:16,319 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:26:16,319 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:26:16,319 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 15:26:16,329 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:26:16,329 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:26:16,406 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:26:16,406 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:26:16,446 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:26:16,530 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 15:26:16,530 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:26:19,091 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 15:26:19,111 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:26:19,111 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2018-12-03 15:26:19,111 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:26:19,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-12-03 15:26:19,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-12-03 15:26:19,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2671, Invalid=4639, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 15:26:19,113 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 45 states. [2018-12-03 15:26:22,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:26:22,965 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-12-03 15:26:22,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 15:26:22,968 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 44 [2018-12-03 15:26:22,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:26:22,969 INFO L225 Difference]: With dead ends: 49 [2018-12-03 15:26:22,969 INFO L226 Difference]: Without dead ends: 47 [2018-12-03 15:26:22,971 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 903 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=6115, Invalid=9887, Unknown=0, NotChecked=0, Total=16002 [2018-12-03 15:26:22,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-12-03 15:26:22,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-12-03 15:26:22,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-12-03 15:26:22,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-12-03 15:26:22,976 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2018-12-03 15:26:22,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:26:22,976 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-12-03 15:26:22,976 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-12-03 15:26:22,976 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-12-03 15:26:22,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-12-03 15:26:22,977 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:26:22,977 INFO L402 BasicCegarLoop]: trace histogram [43, 1, 1, 1] [2018-12-03 15:26:22,977 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:26:22,977 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:26:22,977 INFO L82 PathProgramCache]: Analyzing trace with hash -309493044, now seen corresponding path program 22 times [2018-12-03 15:26:22,978 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:26:22,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:26:22,978 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:26:22,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:26:22,979 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:26:23,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:26:24,024 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 15:26:24,024 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:26:24,024 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:26:24,024 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:26:24,025 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:26:24,025 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:26:24,025 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 15:26:24,033 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:26:24,033 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:26:24,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:26:24,162 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:26:24,238 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 15:26:24,238 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:26:27,207 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 15:26:27,226 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:26:27,226 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 89 [2018-12-03 15:26:27,226 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:26:27,227 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 15:26:27,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 15:26:27,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2930, Invalid=5080, Unknown=0, NotChecked=0, Total=8010 [2018-12-03 15:26:27,228 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 47 states. [2018-12-03 15:26:31,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:26:31,521 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2018-12-03 15:26:31,521 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 15:26:31,521 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 46 [2018-12-03 15:26:31,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:26:31,522 INFO L225 Difference]: With dead ends: 51 [2018-12-03 15:26:31,522 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 15:26:31,524 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 990 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=6714, Invalid=10842, Unknown=0, NotChecked=0, Total=17556 [2018-12-03 15:26:31,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 15:26:31,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-12-03 15:26:31,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-03 15:26:31,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-12-03 15:26:31,528 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2018-12-03 15:26:31,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:26:31,529 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-12-03 15:26:31,529 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 15:26:31,529 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-12-03 15:26:31,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 15:26:31,529 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:26:31,529 INFO L402 BasicCegarLoop]: trace histogram [45, 1, 1, 1] [2018-12-03 15:26:31,529 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:26:31,530 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:26:31,530 INFO L82 PathProgramCache]: Analyzing trace with hash -1070014036, now seen corresponding path program 23 times [2018-12-03 15:26:31,530 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:26:31,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:26:31,530 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:26:31,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:26:31,530 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:26:31,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:26:32,845 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 15:26:32,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:26:32,845 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:26:32,845 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:26:32,845 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:26:32,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:26:32,846 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 15:26:32,857 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:26:32,858 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:26:32,911 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 15:26:32,912 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:26:32,916 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:26:32,992 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 15:26:32,993 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:26:36,032 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 15:26:36,050 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:26:36,050 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-12-03 15:26:36,050 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:26:36,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-12-03 15:26:36,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-12-03 15:26:36,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3201, Invalid=5541, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 15:26:36,052 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 49 states. [2018-12-03 15:26:36,294 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 9 [2018-12-03 15:26:36,434 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 15:26:40,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:26:40,728 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2018-12-03 15:26:40,729 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-12-03 15:26:40,729 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 48 [2018-12-03 15:26:40,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:26:40,730 INFO L225 Difference]: With dead ends: 53 [2018-12-03 15:26:40,730 INFO L226 Difference]: Without dead ends: 51 [2018-12-03 15:26:40,731 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1081 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=7341, Invalid=11841, Unknown=0, NotChecked=0, Total=19182 [2018-12-03 15:26:40,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-12-03 15:26:40,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-12-03 15:26:40,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-03 15:26:40,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-12-03 15:26:40,737 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2018-12-03 15:26:40,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:26:40,737 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-12-03 15:26:40,737 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-12-03 15:26:40,737 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-12-03 15:26:40,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-12-03 15:26:40,738 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:26:40,738 INFO L402 BasicCegarLoop]: trace histogram [47, 1, 1, 1] [2018-12-03 15:26:40,738 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:26:40,738 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:26:40,739 INFO L82 PathProgramCache]: Analyzing trace with hash -1786247028, now seen corresponding path program 24 times [2018-12-03 15:26:40,739 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:26:40,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:26:40,739 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:26:40,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:26:40,740 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:26:40,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:26:42,272 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 15:26:42,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:26:42,272 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:26:42,272 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:26:42,273 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:26:42,273 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:26:42,273 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 15:26:42,281 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:26:42,281 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:26:42,388 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:26:42,389 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:26:42,447 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:26:42,508 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 15:26:42,508 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:26:45,705 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 15:26:45,724 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:26:45,724 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2018-12-03 15:26:45,724 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:26:45,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-12-03 15:26:45,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-12-03 15:26:45,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3484, Invalid=6022, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 15:26:45,725 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 51 states. [2018-12-03 15:26:46,591 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 11 [2018-12-03 15:26:50,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:26:50,856 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-12-03 15:26:50,856 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-12-03 15:26:50,856 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 50 [2018-12-03 15:26:50,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:26:50,857 INFO L225 Difference]: With dead ends: 55 [2018-12-03 15:26:50,857 INFO L226 Difference]: Without dead ends: 53 [2018-12-03 15:26:50,859 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 15:26:50,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-12-03 15:26:50,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-12-03 15:26:50,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-12-03 15:26:50,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-12-03 15:26:50,864 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2018-12-03 15:26:50,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:26:50,865 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-12-03 15:26:50,865 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-12-03 15:26:50,865 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-12-03 15:26:50,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-12-03 15:26:50,865 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:26:50,865 INFO L402 BasicCegarLoop]: trace histogram [49, 1, 1, 1] [2018-12-03 15:26:50,865 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:26:50,866 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:26:50,866 INFO L82 PathProgramCache]: Analyzing trace with hash 1403582316, now seen corresponding path program 25 times [2018-12-03 15:26:50,866 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:26:50,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:26:50,866 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:26:50,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:26:50,867 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:26:50,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:26:52,923 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 15:26:52,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:26:52,924 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:26:52,924 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:26:52,924 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:26:52,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:26:52,924 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 15:26:52,932 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:26:52,932 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:26:53,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:26:53,113 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:26:53,219 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 15:26:53,219 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:26:56,900 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 15:26:56,918 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:26:56,918 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 101 [2018-12-03 15:26:56,918 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:26:56,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 15:26:56,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 15:26:56,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3779, Invalid=6523, Unknown=0, NotChecked=0, Total=10302 [2018-12-03 15:26:56,920 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 53 states. [2018-12-03 15:26:57,050 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 8 [2018-12-03 15:26:57,169 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 9 [2018-12-03 15:26:57,294 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:26:57,422 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:26:57,552 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 15:27:02,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:27:02,663 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2018-12-03 15:27:02,663 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 15:27:02,663 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 52 [2018-12-03 15:27:02,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:27:02,664 INFO L225 Difference]: With dead ends: 57 [2018-12-03 15:27:02,664 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 15:27:02,665 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1275 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=8679, Invalid=13971, Unknown=0, NotChecked=0, Total=22650 [2018-12-03 15:27:02,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 15:27:02,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-12-03 15:27:02,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-12-03 15:27:02,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-12-03 15:27:02,670 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2018-12-03 15:27:02,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:27:02,670 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-12-03 15:27:02,670 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 15:27:02,670 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-12-03 15:27:02,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-12-03 15:27:02,671 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:27:02,671 INFO L402 BasicCegarLoop]: trace histogram [51, 1, 1, 1] [2018-12-03 15:27:02,672 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:27:02,672 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:27:02,672 INFO L82 PathProgramCache]: Analyzing trace with hash 222932556, now seen corresponding path program 26 times [2018-12-03 15:27:02,672 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:27:02,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:27:02,673 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:27:02,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:27:02,673 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:27:02,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:27:04,282 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 15:27:04,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:27:04,283 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:27:04,283 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:27:04,283 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:27:04,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:27:04,283 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 15:27:04,295 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:27:04,295 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:27:04,332 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-12-03 15:27:04,332 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:27:04,336 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:27:04,411 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 15:27:04,411 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:27:08,472 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 15:27:08,491 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:27:08,491 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-12-03 15:27:08,491 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:27:08,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 15:27:08,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 15:27:08,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4086, Invalid=7044, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 15:27:08,492 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 55 states. [2018-12-03 15:27:08,627 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 8 [2018-12-03 15:27:08,759 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 9 [2018-12-03 15:27:08,895 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:27:09,023 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:27:09,159 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:27:09,296 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:27:14,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:27:14,692 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2018-12-03 15:27:14,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 15:27:14,693 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 54 [2018-12-03 15:27:14,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:27:14,694 INFO L225 Difference]: With dead ends: 59 [2018-12-03 15:27:14,694 INFO L226 Difference]: Without dead ends: 57 [2018-12-03 15:27:14,695 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 15:27:14,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-12-03 15:27:14,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-12-03 15:27:14,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-03 15:27:14,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-12-03 15:27:14,700 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2018-12-03 15:27:14,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:27:14,700 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-12-03 15:27:14,700 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 15:27:14,700 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-12-03 15:27:14,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-12-03 15:27:14,700 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:27:14,700 INFO L402 BasicCegarLoop]: trace histogram [53, 1, 1, 1] [2018-12-03 15:27:14,701 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:27:14,701 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:27:14,701 INFO L82 PathProgramCache]: Analyzing trace with hash -510120660, now seen corresponding path program 27 times [2018-12-03 15:27:14,701 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:27:14,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:27:14,702 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:27:14,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:27:14,702 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:27:14,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:27:16,258 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 15:27:16,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:27:16,259 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:27:16,259 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:27:16,259 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:27:16,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:27:16,259 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 15:27:16,268 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:27:16,269 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:27:16,415 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:27:16,415 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:27:16,498 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:27:16,611 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 15:27:16,612 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:27:20,903 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 15:27:20,922 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:27:20,922 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 109 [2018-12-03 15:27:20,922 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:27:20,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-12-03 15:27:20,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-12-03 15:27:20,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4405, Invalid=7585, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 15:27:20,923 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 57 states. [2018-12-03 15:27:21,060 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2018-12-03 15:27:21,195 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2018-12-03 15:27:21,335 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:27:21,467 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:27:21,605 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:27:21,746 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:27:21,885 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:27:22,027 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:27:22,174 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 15:27:22,331 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 15:27:22,491 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 15:27:27,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:27:27,856 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-12-03 15:27:27,856 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 15:27:27,857 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 56 [2018-12-03 15:27:27,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:27:27,857 INFO L225 Difference]: With dead ends: 61 [2018-12-03 15:27:27,857 INFO L226 Difference]: Without dead ends: 59 [2018-12-03 15:27:27,859 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1485 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=10129, Invalid=16277, Unknown=0, NotChecked=0, Total=26406 [2018-12-03 15:27:27,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-12-03 15:27:27,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-12-03 15:27:27,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-12-03 15:27:27,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-12-03 15:27:27,862 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2018-12-03 15:27:27,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:27:27,862 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-12-03 15:27:27,862 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-12-03 15:27:27,862 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-12-03 15:27:27,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-12-03 15:27:27,863 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:27:27,863 INFO L402 BasicCegarLoop]: trace histogram [55, 1, 1, 1] [2018-12-03 15:27:27,863 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:27:27,863 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:27:27,863 INFO L82 PathProgramCache]: Analyzing trace with hash -599624692, now seen corresponding path program 28 times [2018-12-03 15:27:27,863 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:27:27,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:27:27,864 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:27:27,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:27:27,864 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:27:28,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:27:29,667 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 15:27:29,667 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:27:29,667 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:27:29,667 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:27:29,667 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:27:29,667 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:27:29,668 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 15:27:29,676 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:27:29,677 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:27:29,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:27:29,923 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:27:30,030 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 15:27:30,030 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:27:34,708 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 15:27:34,728 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:27:34,728 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 113 [2018-12-03 15:27:34,728 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:27:34,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 15:27:34,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 15:27:34,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4736, Invalid=8146, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 15:27:34,729 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 59 states. [2018-12-03 15:27:34,876 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 8 [2018-12-03 15:27:35,013 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 9 [2018-12-03 15:27:35,182 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:27:35,330 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:27:35,481 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:27:35,625 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:27:35,770 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:27:35,917 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:27:36,064 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:27:36,220 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:27:36,529 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 15:27:42,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:27:42,205 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2018-12-03 15:27:42,206 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 15:27:42,206 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 58 [2018-12-03 15:27:42,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:27:42,206 INFO L225 Difference]: With dead ends: 63 [2018-12-03 15:27:42,207 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 15:27:42,208 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1596 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=10896, Invalid=17496, Unknown=0, NotChecked=0, Total=28392 [2018-12-03 15:27:42,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 15:27:42,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-12-03 15:27:42,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-12-03 15:27:42,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-12-03 15:27:42,213 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2018-12-03 15:27:42,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:27:42,213 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-12-03 15:27:42,213 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 15:27:42,213 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-12-03 15:27:42,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-12-03 15:27:42,213 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:27:42,214 INFO L402 BasicCegarLoop]: trace histogram [57, 1, 1, 1] [2018-12-03 15:27:42,214 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:27:42,214 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:27:42,214 INFO L82 PathProgramCache]: Analyzing trace with hash -713653524, now seen corresponding path program 29 times [2018-12-03 15:27:42,214 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:27:42,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:27:42,215 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:27:42,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:27:42,215 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:27:42,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:27:44,304 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 15:27:44,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:27:44,305 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:27:44,305 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:27:44,305 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:27:44,305 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:27:44,305 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 15:27:44,314 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:27:44,314 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:27:44,355 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-12-03 15:27:44,355 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:27:44,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:27:44,447 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 15:27:44,447 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:27:49,331 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 15:27:49,350 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:27:49,350 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 117 [2018-12-03 15:27:49,350 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:27:49,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-12-03 15:27:49,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-12-03 15:27:49,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5079, Invalid=8727, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 15:27:49,352 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 61 states. [2018-12-03 15:27:49,517 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 8 [2018-12-03 15:27:49,666 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 9 [2018-12-03 15:27:49,823 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:27:49,977 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:27:50,129 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:27:50,281 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:27:50,436 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:27:50,602 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:27:50,762 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:27:50,925 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:27:51,085 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:27:51,416 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 15:27:57,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:27:57,619 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2018-12-03 15:27:57,620 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-12-03 15:27:57,620 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 60 [2018-12-03 15:27:57,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:27:57,621 INFO L225 Difference]: With dead ends: 65 [2018-12-03 15:27:57,621 INFO L226 Difference]: Without dead ends: 63 [2018-12-03 15:27:57,624 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1711 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=11691, Invalid=18759, Unknown=0, NotChecked=0, Total=30450 [2018-12-03 15:27:57,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-12-03 15:27:57,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-12-03 15:27:57,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-03 15:27:57,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-12-03 15:27:57,629 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2018-12-03 15:27:57,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:27:57,629 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-12-03 15:27:57,629 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-12-03 15:27:57,629 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-12-03 15:27:57,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 15:27:57,630 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:27:57,630 INFO L402 BasicCegarLoop]: trace histogram [59, 1, 1, 1] [2018-12-03 15:27:57,630 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:27:57,631 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:27:57,631 INFO L82 PathProgramCache]: Analyzing trace with hash 1373788620, now seen corresponding path program 30 times [2018-12-03 15:27:57,631 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:27:57,631 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:27:57,632 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:27:57,632 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:27:57,632 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:27:57,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:27:59,906 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 15:27:59,906 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:27:59,906 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:27:59,906 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:27:59,906 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:27:59,906 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:27:59,906 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 15:27:59,916 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:27:59,917 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:28:00,110 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:28:00,110 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:28:00,217 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:28:00,363 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 15:28:00,364 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:28:05,740 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 15:28:05,760 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:28:05,760 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 121 [2018-12-03 15:28:05,760 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:28:05,760 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-12-03 15:28:05,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-12-03 15:28:05,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5434, Invalid=9328, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 15:28:05,761 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 63 states. [2018-12-03 15:28:05,923 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 8 [2018-12-03 15:28:06,074 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 9 [2018-12-03 15:28:06,237 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:28:06,397 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:28:06,560 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:28:06,726 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:28:06,887 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:28:07,048 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:28:07,217 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:28:07,383 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:28:07,551 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:28:07,715 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:28:07,878 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:28:08,424 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 15:28:08,648 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 15:28:14,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:28:14,578 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-12-03 15:28:14,579 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 15:28:14,579 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 62 [2018-12-03 15:28:14,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:28:14,580 INFO L225 Difference]: With dead ends: 67 [2018-12-03 15:28:14,580 INFO L226 Difference]: Without dead ends: 65 [2018-12-03 15:28:14,581 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1830 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=12514, Invalid=20066, Unknown=0, NotChecked=0, Total=32580 [2018-12-03 15:28:14,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-12-03 15:28:14,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2018-12-03 15:28:14,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-12-03 15:28:14,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-12-03 15:28:14,585 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2018-12-03 15:28:14,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:28:14,585 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-12-03 15:28:14,585 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-12-03 15:28:14,585 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-12-03 15:28:14,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-12-03 15:28:14,586 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:28:14,586 INFO L402 BasicCegarLoop]: trace histogram [61, 1, 1, 1] [2018-12-03 15:28:14,586 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:28:14,586 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:28:14,586 INFO L82 PathProgramCache]: Analyzing trace with hash 1655961772, now seen corresponding path program 31 times [2018-12-03 15:28:14,586 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:28:14,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:28:14,587 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:28:14,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:28:14,587 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:28:14,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:28:16,638 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 15:28:16,639 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:28:16,639 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:28:16,639 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:28:16,639 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:28:16,639 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:28:16,639 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 15:28:16,647 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:28:16,648 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:28:16,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:28:16,971 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:28:17,064 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 15:28:17,064 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:28:22,636 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 15:28:22,655 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:28:22,655 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 125 [2018-12-03 15:28:22,655 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:28:22,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 15:28:22,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 15:28:22,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5801, Invalid=9949, Unknown=0, NotChecked=0, Total=15750 [2018-12-03 15:28:22,657 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 65 states. [2018-12-03 15:28:22,828 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2018-12-03 15:28:22,991 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 9 [2018-12-03 15:28:23,161 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:28:23,329 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:28:23,504 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:28:23,676 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:28:23,886 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:28:24,060 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:28:24,236 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:28:24,412 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:28:24,578 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:28:24,747 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:28:24,919 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:28:25,092 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:28:25,278 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:28:32,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:28:32,169 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-12-03 15:28:32,170 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 15:28:32,170 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 64 [2018-12-03 15:28:32,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:28:32,171 INFO L225 Difference]: With dead ends: 69 [2018-12-03 15:28:32,171 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 15:28:32,173 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1953 ImplicationChecksByTransitivity, 16.6s TimeCoverageRelationStatistics Valid=13365, Invalid=21417, Unknown=0, NotChecked=0, Total=34782 [2018-12-03 15:28:32,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 15:28:32,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-12-03 15:28:32,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-12-03 15:28:32,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2018-12-03 15:28:32,179 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2018-12-03 15:28:32,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:28:32,179 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2018-12-03 15:28:32,179 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 15:28:32,179 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2018-12-03 15:28:32,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-12-03 15:28:32,180 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:28:32,180 INFO L402 BasicCegarLoop]: trace histogram [63, 1, 1, 1] [2018-12-03 15:28:32,180 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:28:32,180 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:28:32,181 INFO L82 PathProgramCache]: Analyzing trace with hash -2053546100, now seen corresponding path program 32 times [2018-12-03 15:28:32,181 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:28:32,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:28:32,182 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:28:32,182 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:28:32,182 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:28:32,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:28:34,621 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 15:28:34,621 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:28:34,621 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:28:34,621 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:28:34,621 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:28:34,621 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:28:34,622 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 15:28:34,630 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:28:34,630 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:28:34,675 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-12-03 15:28:34,675 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:28:34,680 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:28:34,772 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 15:28:34,772 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:28:40,441 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 15:28:40,461 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:28:40,461 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 129 [2018-12-03 15:28:40,461 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:28:40,462 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-12-03 15:28:40,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-12-03 15:28:40,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6180, Invalid=10590, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 15:28:40,463 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 67 states. [2018-12-03 15:28:40,640 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 8 [2018-12-03 15:28:40,813 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 9 [2018-12-03 15:28:40,990 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:28:41,169 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:28:41,352 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:28:41,530 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:28:41,703 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:28:41,889 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:28:42,073 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:28:42,248 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:28:42,427 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:28:42,615 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:28:42,805 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:28:42,992 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:28:43,187 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:28:43,372 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:28:43,743 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:28:43,930 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 15:28:44,333 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-12-03 15:28:50,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:28:50,797 INFO L93 Difference]: Finished difference Result 71 states and 72 transitions. [2018-12-03 15:28:50,797 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 15:28:50,798 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 66 [2018-12-03 15:28:50,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:28:50,799 INFO L225 Difference]: With dead ends: 71 [2018-12-03 15:28:50,799 INFO L226 Difference]: Without dead ends: 69 [2018-12-03 15:28:50,801 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2080 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=14244, Invalid=22812, Unknown=0, NotChecked=0, Total=37056 [2018-12-03 15:28:50,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-12-03 15:28:50,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-12-03 15:28:50,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-12-03 15:28:50,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-12-03 15:28:50,806 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2018-12-03 15:28:50,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:28:50,806 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-12-03 15:28:50,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-12-03 15:28:50,806 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-12-03 15:28:50,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-12-03 15:28:50,807 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:28:50,807 INFO L402 BasicCegarLoop]: trace histogram [65, 1, 1, 1] [2018-12-03 15:28:50,807 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:28:50,807 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:28:50,807 INFO L82 PathProgramCache]: Analyzing trace with hash -2067755412, now seen corresponding path program 33 times [2018-12-03 15:28:50,807 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:28:50,808 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:28:50,808 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:28:50,808 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:28:50,808 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:28:51,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:28:53,255 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 15:28:53,255 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:28:53,255 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:28:53,255 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:28:53,256 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:28:53,256 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:28:53,256 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 15:28:53,265 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:28:53,265 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:28:53,512 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:28:53,512 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:28:53,655 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:28:53,759 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 15:28:53,759 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:29:00,154 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 15:29:00,172 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:29:00,173 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 133 [2018-12-03 15:29:00,173 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:29:00,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-12-03 15:29:00,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-12-03 15:29:00,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6571, Invalid=11251, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 15:29:00,174 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 69 states. [2018-12-03 15:29:00,362 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2018-12-03 15:29:00,545 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2018-12-03 15:29:00,732 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:29:00,917 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:29:01,110 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:29:01,291 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:29:01,478 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:29:01,667 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:29:01,854 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:29:02,053 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:29:02,248 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:29:02,446 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:29:02,629 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:29:02,818 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:29:03,016 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:29:03,215 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:29:03,409 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:29:03,608 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:29:03,806 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:29:04,020 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:29:11,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:29:11,251 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2018-12-03 15:29:11,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-12-03 15:29:11,252 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 68 [2018-12-03 15:29:11,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:29:11,253 INFO L225 Difference]: With dead ends: 73 [2018-12-03 15:29:11,253 INFO L226 Difference]: Without dead ends: 71 [2018-12-03 15:29:11,254 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2211 ImplicationChecksByTransitivity, 19.4s TimeCoverageRelationStatistics Valid=15151, Invalid=24251, Unknown=0, NotChecked=0, Total=39402 [2018-12-03 15:29:11,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-12-03 15:29:11,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2018-12-03 15:29:11,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-12-03 15:29:11,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2018-12-03 15:29:11,259 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2018-12-03 15:29:11,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:29:11,259 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2018-12-03 15:29:11,259 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-12-03 15:29:11,260 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2018-12-03 15:29:11,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-12-03 15:29:11,260 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:29:11,260 INFO L402 BasicCegarLoop]: trace histogram [67, 1, 1, 1] [2018-12-03 15:29:11,260 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:29:11,260 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:29:11,261 INFO L82 PathProgramCache]: Analyzing trace with hash 1456964940, now seen corresponding path program 34 times [2018-12-03 15:29:11,261 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:29:11,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:29:11,261 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:29:11,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:29:11,261 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:29:11,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:29:14,987 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 15:29:14,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:29:14,987 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:29:14,988 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:29:14,988 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:29:14,988 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:29:14,988 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 15:29:14,996 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:29:14,996 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:29:15,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:29:15,420 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:29:15,517 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 15:29:15,517 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:29:22,437 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 15:29:22,456 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:29:22,456 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 137 [2018-12-03 15:29:22,456 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:29:22,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 15:29:22,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 15:29:22,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6974, Invalid=11932, Unknown=0, NotChecked=0, Total=18906 [2018-12-03 15:29:22,458 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 71 states. [2018-12-03 15:29:22,653 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 8 [2018-12-03 15:29:22,845 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 9 [2018-12-03 15:29:23,052 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:29:23,250 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:29:23,451 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:29:23,652 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:29:23,848 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:29:24,053 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:29:24,258 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:29:24,470 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:29:24,675 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:29:24,877 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:29:25,076 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:29:25,298 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:29:25,507 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:29:25,714 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:29:25,915 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:29:26,124 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:29:26,334 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:29:26,541 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:29:26,749 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:29:26,958 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:29:34,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:29:34,334 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2018-12-03 15:29:34,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 15:29:34,334 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 70 [2018-12-03 15:29:34,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:29:34,335 INFO L225 Difference]: With dead ends: 75 [2018-12-03 15:29:34,335 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 15:29:34,336 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2346 ImplicationChecksByTransitivity, 21.8s TimeCoverageRelationStatistics Valid=16086, Invalid=25734, Unknown=0, NotChecked=0, Total=41820 [2018-12-03 15:29:34,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 15:29:34,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2018-12-03 15:29:34,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-03 15:29:34,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2018-12-03 15:29:34,341 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2018-12-03 15:29:34,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:29:34,341 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2018-12-03 15:29:34,341 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 15:29:34,342 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2018-12-03 15:29:34,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 15:29:34,342 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:29:34,342 INFO L402 BasicCegarLoop]: trace histogram [69, 1, 1, 1] [2018-12-03 15:29:34,342 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:29:34,343 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:29:34,343 INFO L82 PathProgramCache]: Analyzing trace with hash -15973332, now seen corresponding path program 35 times [2018-12-03 15:29:34,343 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:29:34,343 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:29:34,344 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:29:34,344 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:29:34,344 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:29:34,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:29:37,205 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 15:29:37,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:29:37,206 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:29:37,206 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:29:37,206 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:29:37,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:29:37,206 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 15:29:37,214 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:29:37,214 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:29:37,267 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-12-03 15:29:37,267 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:29:37,271 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:29:37,399 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 15:29:37,400 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:29:44,293 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 15:29:44,313 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:29:44,313 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 141 [2018-12-03 15:29:44,313 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:29:44,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-12-03 15:29:44,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-12-03 15:29:44,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7389, Invalid=12633, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 15:29:44,314 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 73 states. [2018-12-03 15:29:44,514 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 8 [2018-12-03 15:29:44,714 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 9 [2018-12-03 15:29:44,915 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:29:45,117 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:29:45,319 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:29:45,515 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:29:45,763 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:29:45,987 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:29:46,196 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:29:46,408 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:29:46,617 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:29:46,836 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:29:47,052 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:29:47,261 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:29:47,487 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:29:47,703 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:29:47,919 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:29:48,134 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:29:48,353 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:29:48,572 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:29:48,794 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:29:49,007 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:29:49,226 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:29:49,646 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 15:29:50,979 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 128 DAG size of output: 11 [2018-12-03 15:29:57,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:29:57,227 INFO L93 Difference]: Finished difference Result 77 states and 78 transitions. [2018-12-03 15:29:57,227 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-12-03 15:29:57,227 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 72 [2018-12-03 15:29:57,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:29:57,228 INFO L225 Difference]: With dead ends: 77 [2018-12-03 15:29:57,228 INFO L226 Difference]: Without dead ends: 75 [2018-12-03 15:29:57,231 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2485 ImplicationChecksByTransitivity, 22.1s TimeCoverageRelationStatistics Valid=17049, Invalid=27261, Unknown=0, NotChecked=0, Total=44310 [2018-12-03 15:29:57,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-12-03 15:29:57,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-12-03 15:29:57,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-12-03 15:29:57,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-12-03 15:29:57,236 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2018-12-03 15:29:57,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:29:57,236 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-12-03 15:29:57,236 INFO L481 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-12-03 15:29:57,237 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-12-03 15:29:57,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-12-03 15:29:57,237 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:29:57,237 INFO L402 BasicCegarLoop]: trace histogram [71, 1, 1, 1] [2018-12-03 15:29:57,237 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:29:57,237 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:29:57,238 INFO L82 PathProgramCache]: Analyzing trace with hash 1829554956, now seen corresponding path program 36 times [2018-12-03 15:29:57,238 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:29:57,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:29:57,238 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:29:57,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:29:57,239 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:29:57,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:30:00,681 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 15:30:00,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:30:00,682 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:30:00,682 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:30:00,682 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:30:00,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:30:00,682 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 15:30:00,692 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:30:00,692 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:30:01,007 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:30:01,007 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:30:01,188 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:30:01,404 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 15:30:01,404 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:30:08,720 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 15:30:08,740 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:30:08,740 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 145 [2018-12-03 15:30:08,740 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:30:08,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-12-03 15:30:08,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-12-03 15:30:08,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7816, Invalid=13354, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 15:30:08,742 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 75 states. [2018-12-03 15:30:08,998 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 8 [2018-12-03 15:30:09,211 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 9 [2018-12-03 15:30:09,425 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:30:09,640 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:30:09,853 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:30:10,064 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:30:10,276 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:30:10,489 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:30:10,710 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:30:10,935 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:30:11,150 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:30:11,390 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:30:11,614 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:30:11,836 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:30:12,075 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:30:12,309 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:30:12,532 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:30:12,764 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:30:12,987 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:30:13,217 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:30:13,450 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:30:13,685 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:30:13,910 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:30:14,148 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:30:14,374 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:30:14,597 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:30:22,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:30:22,793 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-12-03 15:30:22,793 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 15:30:22,793 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 74 [2018-12-03 15:30:22,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:30:22,794 INFO L225 Difference]: With dead ends: 79 [2018-12-03 15:30:22,794 INFO L226 Difference]: Without dead ends: 77 [2018-12-03 15:30:22,796 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2628 ImplicationChecksByTransitivity, 24.0s TimeCoverageRelationStatistics Valid=18040, Invalid=28832, Unknown=0, NotChecked=0, Total=46872 [2018-12-03 15:30:22,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-12-03 15:30:22,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2018-12-03 15:30:22,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-12-03 15:30:22,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2018-12-03 15:30:22,803 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2018-12-03 15:30:22,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:30:22,803 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2018-12-03 15:30:22,803 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-12-03 15:30:22,803 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2018-12-03 15:30:22,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-12-03 15:30:22,807 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:30:22,807 INFO L402 BasicCegarLoop]: trace histogram [73, 1, 1, 1] [2018-12-03 15:30:22,807 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:30:22,807 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:30:22,807 INFO L82 PathProgramCache]: Analyzing trace with hash 1560746476, now seen corresponding path program 37 times [2018-12-03 15:30:22,808 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:30:22,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:30:22,809 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:30:22,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:30:22,809 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:30:23,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:30:25,760 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 15:30:25,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:30:25,761 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:30:25,761 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:30:25,761 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:30:25,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:30:25,761 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 15:30:25,774 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:30:25,775 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:30:26,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:30:26,337 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:30:26,471 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 15:30:26,472 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:30:34,384 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 15:30:34,403 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:30:34,403 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 149 [2018-12-03 15:30:34,403 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:30:34,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 15:30:34,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 15:30:34,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8255, Invalid=14095, Unknown=0, NotChecked=0, Total=22350 [2018-12-03 15:30:34,405 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 77 states. [2018-12-03 15:30:34,628 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2018-12-03 15:30:34,858 WARN L180 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 9 [2018-12-03 15:30:35,084 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:30:35,307 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:30:35,529 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:30:35,744 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:30:35,964 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:30:36,180 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:30:36,413 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:30:36,651 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:30:36,885 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:30:37,137 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:30:37,387 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:30:37,612 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:30:37,848 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:30:38,089 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:30:38,322 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:30:38,561 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:30:38,803 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:30:39,047 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:30:39,289 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:30:39,526 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:30:39,762 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:30:40,019 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:30:40,253 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:30:40,484 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:30:40,725 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:30:40,964 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:30:49,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:30:49,317 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2018-12-03 15:30:49,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 15:30:49,318 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 76 [2018-12-03 15:30:49,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:30:49,318 INFO L225 Difference]: With dead ends: 81 [2018-12-03 15:30:49,319 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 15:30:49,320 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 221 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2775 ImplicationChecksByTransitivity, 25.1s TimeCoverageRelationStatistics Valid=19059, Invalid=30447, Unknown=0, NotChecked=0, Total=49506 [2018-12-03 15:30:49,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 15:30:49,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-12-03 15:30:49,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-12-03 15:30:49,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-12-03 15:30:49,324 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2018-12-03 15:30:49,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:30:49,324 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-12-03 15:30:49,324 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 15:30:49,324 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-12-03 15:30:49,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-12-03 15:30:49,325 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:30:49,325 INFO L402 BasicCegarLoop]: trace histogram [75, 1, 1, 1] [2018-12-03 15:30:49,325 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:30:49,325 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:30:49,325 INFO L82 PathProgramCache]: Analyzing trace with hash 933834956, now seen corresponding path program 38 times [2018-12-03 15:30:49,326 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:30:49,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:30:49,326 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:30:49,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:30:49,327 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:30:49,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:30:52,980 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 15:30:52,980 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:30:52,980 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:30:52,980 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:30:52,981 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:30:52,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:30:52,981 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 15:30:52,998 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:30:52,998 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:30:53,115 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-12-03 15:30:53,115 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:30:53,120 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:30:53,262 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 15:30:53,262 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:31:01,327 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 15:31:01,356 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:31:01,356 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 153 [2018-12-03 15:31:01,356 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:31:01,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-12-03 15:31:01,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-12-03 15:31:01,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8706, Invalid=14856, Unknown=0, NotChecked=0, Total=23562 [2018-12-03 15:31:01,358 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 79 states. [2018-12-03 15:31:01,678 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 8 [2018-12-03 15:31:01,911 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 9 [2018-12-03 15:31:02,143 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:31:02,368 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:31:02,643 WARN L180 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:31:02,885 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:31:03,112 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:31:03,345 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:31:03,593 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:31:03,833 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:31:04,079 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:31:04,328 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:31:04,574 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:31:04,827 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:31:05,088 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:31:05,338 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:31:05,583 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:31:05,835 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:31:06,080 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:31:06,336 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:31:06,593 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:31:06,849 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:31:07,118 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:31:07,368 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:31:07,628 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:31:07,915 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:31:08,161 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:31:08,410 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:31:08,660 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:31:17,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:31:17,349 INFO L93 Difference]: Finished difference Result 83 states and 84 transitions. [2018-12-03 15:31:17,349 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-12-03 15:31:17,349 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 78 [2018-12-03 15:31:17,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:31:17,350 INFO L225 Difference]: With dead ends: 83 [2018-12-03 15:31:17,350 INFO L226 Difference]: Without dead ends: 81 [2018-12-03 15:31:17,352 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 227 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2926 ImplicationChecksByTransitivity, 26.9s TimeCoverageRelationStatistics Valid=20106, Invalid=32106, Unknown=0, NotChecked=0, Total=52212 [2018-12-03 15:31:17,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-12-03 15:31:17,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-12-03 15:31:17,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-12-03 15:31:17,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-12-03 15:31:17,357 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2018-12-03 15:31:17,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:31:17,358 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-12-03 15:31:17,358 INFO L481 AbstractCegarLoop]: Interpolant automaton has 79 states. [2018-12-03 15:31:17,358 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-12-03 15:31:17,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-12-03 15:31:17,358 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:31:17,358 INFO L402 BasicCegarLoop]: trace histogram [77, 1, 1, 1] [2018-12-03 15:31:17,358 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:31:17,358 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:31:17,359 INFO L82 PathProgramCache]: Analyzing trace with hash -232714324, now seen corresponding path program 39 times [2018-12-03 15:31:17,359 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:31:17,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:31:17,359 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:31:17,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:31:17,359 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:31:17,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:31:20,845 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 15:31:20,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:31:20,845 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:31:20,845 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:31:20,845 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:31:20,846 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:31:20,846 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 15:31:20,856 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:31:20,856 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:31:21,243 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:31:21,244 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:31:21,473 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:31:21,582 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 15:31:21,582 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:31:30,410 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 15:31:30,429 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:31:30,430 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 157 [2018-12-03 15:31:30,430 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:31:30,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-12-03 15:31:30,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-12-03 15:31:30,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9169, Invalid=15637, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 15:31:30,431 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 81 states. [2018-12-03 15:31:30,685 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 8 [2018-12-03 15:31:30,920 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 9 [2018-12-03 15:31:31,170 WARN L180 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:31:31,420 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:31:31,670 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:31:31,912 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:31:32,157 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:31:32,394 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:31:32,653 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:31:32,904 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:31:33,165 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:31:33,440 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:31:33,698 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:31:33,945 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:31:34,205 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:31:34,455 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:31:34,717 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:31:34,978 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:31:35,245 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:31:35,515 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:31:35,795 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:31:36,061 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:31:36,340 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:31:36,601 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:31:36,872 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:31:37,131 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:31:37,390 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:31:37,654 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:31:37,921 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:31:38,194 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:31:38,480 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:31:38,731 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:31:47,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:31:47,462 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2018-12-03 15:31:47,462 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 15:31:47,462 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 80 [2018-12-03 15:31:47,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:31:47,463 INFO L225 Difference]: With dead ends: 85 [2018-12-03 15:31:47,463 INFO L226 Difference]: Without dead ends: 83 [2018-12-03 15:31:47,465 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 233 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3081 ImplicationChecksByTransitivity, 28.6s TimeCoverageRelationStatistics Valid=21181, Invalid=33809, Unknown=0, NotChecked=0, Total=54990 [2018-12-03 15:31:47,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-12-03 15:31:47,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2018-12-03 15:31:47,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-12-03 15:31:47,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2018-12-03 15:31:47,470 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2018-12-03 15:31:47,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:31:47,470 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2018-12-03 15:31:47,471 INFO L481 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-12-03 15:31:47,471 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2018-12-03 15:31:47,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-12-03 15:31:47,471 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:31:47,471 INFO L402 BasicCegarLoop]: trace histogram [79, 1, 1, 1] [2018-12-03 15:31:47,471 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:31:47,471 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:31:47,472 INFO L82 PathProgramCache]: Analyzing trace with hash -300108148, now seen corresponding path program 40 times [2018-12-03 15:31:47,472 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:31:47,472 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:31:47,472 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:31:47,472 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:31:47,473 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:31:47,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:31:51,407 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 15:31:51,407 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:31:51,407 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:31:51,407 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:31:51,407 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:31:51,407 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:31:51,407 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 15:31:51,416 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:31:51,416 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:31:51,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:31:52,092 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:31:52,212 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 15:31:52,212 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:32:01,382 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 15:32:01,401 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:32:01,401 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 161 [2018-12-03 15:32:01,401 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:32:01,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 15:32:01,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 15:32:01,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9644, Invalid=16438, Unknown=0, NotChecked=0, Total=26082 [2018-12-03 15:32:01,403 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 83 states. [2018-12-03 15:32:01,659 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 8 [2018-12-03 15:32:01,915 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 9 [2018-12-03 15:32:02,160 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:32:02,413 WARN L180 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:32:02,665 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:32:02,916 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:32:03,166 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:32:03,428 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:32:03,688 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:32:03,977 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:32:04,254 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:32:04,509 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:32:04,766 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:32:05,024 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:32:05,298 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:32:05,568 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:32:05,836 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:32:06,109 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:32:06,380 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:32:06,668 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:32:06,942 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:32:07,221 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:32:07,516 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:32:07,793 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:32:08,072 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:32:08,344 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:32:08,621 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:32:08,892 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:32:09,176 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:32:09,435 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:32:09,706 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:32:09,976 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:32:10,240 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:32:10,508 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:32:19,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:32:19,644 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2018-12-03 15:32:19,644 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 15:32:19,644 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 82 [2018-12-03 15:32:19,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:32:19,645 INFO L225 Difference]: With dead ends: 87 [2018-12-03 15:32:19,645 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 15:32:19,647 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3240 ImplicationChecksByTransitivity, 30.5s TimeCoverageRelationStatistics Valid=22284, Invalid=35556, Unknown=0, NotChecked=0, Total=57840 [2018-12-03 15:32:19,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 15:32:19,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2018-12-03 15:32:19,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-12-03 15:32:19,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2018-12-03 15:32:19,651 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2018-12-03 15:32:19,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:32:19,652 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2018-12-03 15:32:19,652 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 15:32:19,652 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2018-12-03 15:32:19,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-12-03 15:32:19,652 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:32:19,652 INFO L402 BasicCegarLoop]: trace histogram [81, 1, 1, 1] [2018-12-03 15:32:19,652 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:32:19,653 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:32:19,653 INFO L82 PathProgramCache]: Analyzing trace with hash -641063572, now seen corresponding path program 41 times [2018-12-03 15:32:19,653 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:32:19,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:32:19,654 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:32:19,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:32:19,654 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:32:20,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:32:23,256 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 15:32:23,256 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:32:23,256 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:32:23,256 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:32:23,256 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:32:23,257 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:32:23,257 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 15:32:23,265 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:32:23,266 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:32:23,331 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-12-03 15:32:23,332 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:32:23,338 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:32:23,459 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 15:32:23,459 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:32:33,037 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 15:32:33,057 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:32:33,058 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 165 [2018-12-03 15:32:33,058 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:32:33,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 85 states [2018-12-03 15:32:33,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2018-12-03 15:32:33,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10131, Invalid=17259, Unknown=0, NotChecked=0, Total=27390 [2018-12-03 15:32:33,059 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 85 states. [2018-12-03 15:32:33,325 WARN L180 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 8 [2018-12-03 15:32:33,584 WARN L180 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 9 [2018-12-03 15:32:33,853 WARN L180 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:32:34,108 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:32:34,373 WARN L180 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:32:34,641 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:32:34,913 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:32:35,175 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:32:35,455 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:32:35,723 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:32:35,995 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:32:36,270 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:32:36,542 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:32:36,809 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:32:37,089 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:32:37,361 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:32:37,643 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:32:37,932 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:32:38,215 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:32:38,497 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:32:38,779 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:32:39,061 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:32:39,344 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:32:39,627 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:32:39,947 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:32:40,258 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:32:40,543 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:32:40,826 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:32:41,100 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:32:41,381 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:32:41,661 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:32:41,933 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:32:42,198 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:32:42,467 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:32:42,733 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:32:43,010 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:32:44,342 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 11 [2018-12-03 15:32:52,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:32:52,290 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2018-12-03 15:32:52,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-12-03 15:32:52,291 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 84 [2018-12-03 15:32:52,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:32:52,292 INFO L225 Difference]: With dead ends: 89 [2018-12-03 15:32:52,292 INFO L226 Difference]: Without dead ends: 87 [2018-12-03 15:32:52,294 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3403 ImplicationChecksByTransitivity, 31.6s TimeCoverageRelationStatistics Valid=23415, Invalid=37347, Unknown=0, NotChecked=0, Total=60762 [2018-12-03 15:32:52,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-12-03 15:32:52,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-12-03 15:32:52,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-03 15:32:52,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-12-03 15:32:52,300 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2018-12-03 15:32:52,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:32:52,301 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-12-03 15:32:52,301 INFO L481 AbstractCegarLoop]: Interpolant automaton has 85 states. [2018-12-03 15:32:52,301 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-12-03 15:32:52,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 15:32:52,301 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:32:52,302 INFO L402 BasicCegarLoop]: trace histogram [83, 1, 1, 1] [2018-12-03 15:32:52,302 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:32:52,302 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:32:52,302 INFO L82 PathProgramCache]: Analyzing trace with hash -1881711540, now seen corresponding path program 42 times [2018-12-03 15:32:52,302 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:32:52,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:32:52,303 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:32:52,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:32:52,303 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:32:52,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:32:56,635 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 15:32:56,635 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:32:56,635 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:32:56,636 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:32:56,636 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:32:56,636 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:32:56,636 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 15:32:56,652 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:32:56,653 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:32:57,145 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:32:57,145 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:32:57,428 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:32:57,544 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 15:32:57,544 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:33:07,579 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 15:33:07,599 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:33:07,599 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 169 [2018-12-03 15:33:07,599 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:33:07,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-12-03 15:33:07,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-12-03 15:33:07,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10630, Invalid=18100, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 15:33:07,601 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 87 states. [2018-12-03 15:33:07,876 WARN L180 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 8 [2018-12-03 15:33:08,139 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 9 [2018-12-03 15:33:08,407 WARN L180 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 15:33:08,868 WARN L180 SmtUtils]: Spent 416.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 15:33:09,150 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:33:09,423 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:33:09,700 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:33:09,985 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:33:10,278 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:33:10,590 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:33:10,882 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:33:11,174 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:33:11,459 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:33:11,734 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:33:12,027 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:33:12,314 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:33:12,605 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:33:12,903 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:33:13,190 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:33:13,486 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:33:13,806 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:33:14,102 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:33:14,398 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:33:14,696 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:33:14,994 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:33:15,295 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:33:15,605 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:33:15,926 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:33:16,229 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:33:16,530 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:33:16,838 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:33:17,133 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:33:17,416 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:33:17,710 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:33:17,990 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:33:18,274 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:33:18,547 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:33:18,828 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:33:19,105 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 15:33:20,479 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 11 [2018-12-03 15:33:20,778 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 128 DAG size of output: 11 [2018-12-03 15:33:28,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:33:28,375 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2018-12-03 15:33:28,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-12-03 15:33:28,376 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 86 [2018-12-03 15:33:28,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:33:28,376 INFO L225 Difference]: With dead ends: 91 [2018-12-03 15:33:28,376 INFO L226 Difference]: Without dead ends: 89 [2018-12-03 15:33:28,378 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 251 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3570 ImplicationChecksByTransitivity, 34.1s TimeCoverageRelationStatistics Valid=24574, Invalid=39182, Unknown=0, NotChecked=0, Total=63756 [2018-12-03 15:33:28,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-12-03 15:33:28,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2018-12-03 15:33:28,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-12-03 15:33:28,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2018-12-03 15:33:28,385 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2018-12-03 15:33:28,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:33:28,385 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2018-12-03 15:33:28,386 INFO L481 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-12-03 15:33:28,386 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2018-12-03 15:33:28,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-12-03 15:33:28,386 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:33:28,386 INFO L402 BasicCegarLoop]: trace histogram [85, 1, 1, 1] [2018-12-03 15:33:28,387 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:33:28,387 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:33:28,387 INFO L82 PathProgramCache]: Analyzing trace with hash -143500500, now seen corresponding path program 43 times [2018-12-03 15:33:28,387 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:33:28,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:33:28,388 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:33:28,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:33:28,388 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:33:28,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:33:32,535 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 15:33:32,535 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:33:32,535 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:33:32,535 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:33:32,535 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:33:32,535 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:33:32,536 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 15:33:32,544 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:33:32,544 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:33:33,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:33:33,364 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:33:33,529 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 15:33:33,529 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:33:43,983 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 15:33:44,003 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:33:44,004 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 173 [2018-12-03 15:33:44,004 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:33:44,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 15:33:44,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 15:33:44,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11141, Invalid=18961, Unknown=0, NotChecked=0, Total=30102 [2018-12-03 15:33:44,005 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 89 states. [2018-12-03 15:33:44,290 WARN L180 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 8 [2018-12-03 15:33:44,558 WARN L180 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 9 [2018-12-03 15:33:44,844 WARN L180 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 15:33:45,129 WARN L180 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 15:33:45,414 WARN L180 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 15:33:45,697 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 15:33:45,982 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:33:46,269 WARN L180 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:33:46,583 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:33:46,889 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:33:47,198 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:33:47,497 WARN L180 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:33:47,779 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:33:48,065 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:33:48,386 WARN L180 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:33:48,730 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:33:49,069 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:33:49,419 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:33:49,748 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:33:50,055 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:33:50,372 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:33:50,679 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:33:50,997 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:33:51,304 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:33:51,632 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:33:51,953 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:33:52,259 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:33:52,570 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:33:52,881 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:33:53,193 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:33:53,506 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:33:53,804 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:33:54,098 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:33:54,414 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:33:54,705 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:33:54,991 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:33:55,280 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:33:55,568 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:33:55,856 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:33:56,719 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-12-03 15:33:57,291 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-12-03 15:34:05,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:34:05,885 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2018-12-03 15:34:05,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-12-03 15:34:05,886 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 88 [2018-12-03 15:34:05,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:34:05,887 INFO L225 Difference]: With dead ends: 93 [2018-12-03 15:34:05,887 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 15:34:05,889 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 257 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3741 ImplicationChecksByTransitivity, 35.6s TimeCoverageRelationStatistics Valid=25761, Invalid=41061, Unknown=0, NotChecked=0, Total=66822 [2018-12-03 15:34:05,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 15:34:05,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-12-03 15:34:05,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-12-03 15:34:05,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2018-12-03 15:34:05,894 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2018-12-03 15:34:05,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:34:05,894 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2018-12-03 15:34:05,894 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 15:34:05,894 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2018-12-03 15:34:05,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-12-03 15:34:05,895 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:34:05,895 INFO L402 BasicCegarLoop]: trace histogram [87, 1, 1, 1] [2018-12-03 15:34:05,895 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:34:05,895 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:34:05,895 INFO L82 PathProgramCache]: Analyzing trace with hash -464969204, now seen corresponding path program 44 times [2018-12-03 15:34:05,895 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:34:05,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:34:05,896 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:34:05,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:34:05,896 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:34:06,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:34:10,196 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 15:34:10,196 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:34:10,196 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:34:10,196 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:34:10,196 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:34:10,196 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:34:10,196 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 15:34:10,206 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:34:10,207 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:34:10,272 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-12-03 15:34:10,272 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:34:10,279 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:34:10,396 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 15:34:10,396 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:34:21,296 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 15:34:21,315 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:34:21,315 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 177 [2018-12-03 15:34:21,315 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:34:21,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2018-12-03 15:34:21,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2018-12-03 15:34:21,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11664, Invalid=19842, Unknown=0, NotChecked=0, Total=31506 [2018-12-03 15:34:21,317 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 91 states. [2018-12-03 15:34:21,616 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 8 [2018-12-03 15:34:21,897 WARN L180 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 9 [2018-12-03 15:34:22,203 WARN L180 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 15:34:22,510 WARN L180 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 15:34:22,813 WARN L180 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 15:34:23,101 WARN L180 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 15:34:23,400 WARN L180 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 15:34:23,697 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 15:34:24,004 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:34:24,306 WARN L180 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:34:24,615 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:34:24,915 WARN L180 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:34:25,222 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:34:25,533 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:34:25,852 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:34:26,170 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:34:26,480 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:34:26,801 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:34:27,111 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:34:27,453 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:34:27,780 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:34:28,094 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:34:28,427 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:34:28,753 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:34:29,074 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:34:29,402 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:34:29,735 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:34:30,057 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:34:30,378 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:34:30,695 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:34:31,019 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:34:31,349 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:34:31,661 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:34:31,976 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:34:32,298 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:34:32,642 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:34:32,960 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:34:33,259 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:34:33,559 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:34:33,847 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:34:34,145 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:34:34,430 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:34:44,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:34:44,524 INFO L93 Difference]: Finished difference Result 95 states and 96 transitions. [2018-12-03 15:34:44,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 15:34:44,524 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 90 [2018-12-03 15:34:44,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:34:44,525 INFO L225 Difference]: With dead ends: 95 [2018-12-03 15:34:44,525 INFO L226 Difference]: Without dead ends: 93 [2018-12-03 15:34:44,527 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 263 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3916 ImplicationChecksByTransitivity, 37.4s TimeCoverageRelationStatistics Valid=26976, Invalid=42984, Unknown=0, NotChecked=0, Total=69960 [2018-12-03 15:34:44,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-12-03 15:34:44,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-12-03 15:34:44,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-12-03 15:34:44,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-12-03 15:34:44,534 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2018-12-03 15:34:44,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:34:44,534 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-12-03 15:34:44,534 INFO L481 AbstractCegarLoop]: Interpolant automaton has 91 states. [2018-12-03 15:34:44,534 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-12-03 15:34:44,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-12-03 15:34:44,535 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:34:44,535 INFO L402 BasicCegarLoop]: trace histogram [89, 1, 1, 1] [2018-12-03 15:34:44,535 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:34:44,535 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:34:44,535 INFO L82 PathProgramCache]: Analyzing trace with hash -158748436, now seen corresponding path program 45 times [2018-12-03 15:34:44,535 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:34:44,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:34:44,536 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:34:44,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:34:44,536 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:34:45,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:34:49,178 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 15:34:49,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:34:49,178 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:34:49,179 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:34:49,179 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:34:49,179 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:34:49,179 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 15:34:49,188 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:34:49,188 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:34:49,779 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:34:49,779 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:34:50,127 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:34:50,272 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 15:34:50,272 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:35:01,618 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 15:35:01,637 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:35:01,638 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 181 [2018-12-03 15:35:01,638 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:35:01,638 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2018-12-03 15:35:01,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2018-12-03 15:35:01,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12199, Invalid=20743, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 15:35:01,639 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 93 states. [2018-12-03 15:35:01,948 WARN L180 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 8 [2018-12-03 15:35:02,240 WARN L180 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 9 [2018-12-03 15:35:02,544 WARN L180 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 15:35:02,876 WARN L180 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 15:35:03,204 WARN L180 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 15:35:03,516 WARN L180 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 15:35:03,835 WARN L180 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 15:35:04,142 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 15:35:04,448 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 15:35:04,760 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 15:35:05,082 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:35:05,397 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:35:05,710 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:35:06,033 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:35:06,361 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:35:06,703 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:35:07,031 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:35:07,360 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:35:07,719 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:35:08,047 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:35:08,408 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:35:08,735 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:35:09,078 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:35:09,413 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:35:09,748 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:35:10,098 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:35:10,457 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:35:10,803 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:35:11,146 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:35:11,472 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:35:11,809 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:35:12,143 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:35:12,473 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:35:12,805 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:35:13,134 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:35:13,475 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:35:13,811 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:35:14,138 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:35:14,461 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:35:14,766 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:35:15,072 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:35:15,380 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:35:15,681 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:35:26,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:35:26,562 INFO L93 Difference]: Finished difference Result 97 states and 98 transitions. [2018-12-03 15:35:26,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-12-03 15:35:26,562 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 92 [2018-12-03 15:35:26,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:35:26,564 INFO L225 Difference]: With dead ends: 97 [2018-12-03 15:35:26,564 INFO L226 Difference]: Without dead ends: 95 [2018-12-03 15:35:26,566 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 269 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4095 ImplicationChecksByTransitivity, 39.8s TimeCoverageRelationStatistics Valid=28219, Invalid=44951, Unknown=0, NotChecked=0, Total=73170 [2018-12-03 15:35:26,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-12-03 15:35:26,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2018-12-03 15:35:26,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-12-03 15:35:26,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2018-12-03 15:35:26,574 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2018-12-03 15:35:26,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:35:26,574 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2018-12-03 15:35:26,574 INFO L481 AbstractCegarLoop]: Interpolant automaton has 93 states. [2018-12-03 15:35:26,574 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2018-12-03 15:35:26,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-12-03 15:35:26,574 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:35:26,574 INFO L402 BasicCegarLoop]: trace histogram [91, 1, 1, 1] [2018-12-03 15:35:26,575 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:35:26,575 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:35:26,575 INFO L82 PathProgramCache]: Analyzing trace with hash 2061633484, now seen corresponding path program 46 times [2018-12-03 15:35:26,575 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:35:26,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:35:26,576 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:35:26,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:35:26,576 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:35:27,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:35:31,651 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 15:35:31,651 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:35:31,651 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:35:31,651 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:35:31,652 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:35:31,652 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:35:31,652 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 15:35:31,660 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:35:31,660 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:35:32,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:35:32,655 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:35:32,812 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 15:35:32,813 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:35:44,842 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 15:35:44,863 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:35:44,863 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 185 [2018-12-03 15:35:44,863 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:35:44,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 15:35:44,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 15:35:44,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12746, Invalid=21664, Unknown=0, NotChecked=0, Total=34410 [2018-12-03 15:35:44,865 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 95 states. [2018-12-03 15:35:45,181 WARN L180 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 8 [2018-12-03 15:35:45,487 WARN L180 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 9 [2018-12-03 15:35:45,817 WARN L180 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 15:35:46,170 WARN L180 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 15:35:46,495 WARN L180 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 15:35:46,811 WARN L180 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 15:35:47,134 WARN L180 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 15:35:47,459 WARN L180 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 15:35:47,794 WARN L180 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 15:35:48,126 WARN L180 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 15:35:48,457 WARN L180 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 15:35:48,789 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 15:35:49,112 WARN L180 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:35:49,447 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:35:49,800 WARN L180 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:35:50,143 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:35:50,483 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:35:50,866 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:35:51,200 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:35:51,550 WARN L180 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:35:51,902 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:35:52,251 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:35:52,596 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:35:52,940 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:35:53,299 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:35:53,662 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:35:54,011 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:35:54,410 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:35:54,768 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:35:55,115 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:35:55,464 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:35:55,816 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:35:56,173 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:35:56,517 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:35:56,853 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:35:57,195 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:35:57,529 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:35:57,871 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:35:58,212 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:35:58,542 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:35:58,856 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:35:59,174 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:35:59,507 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:35:59,817 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:36:00,123 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:36:00,437 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:36:00,758 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 15:36:11,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:36:11,139 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-12-03 15:36:11,139 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 15:36:11,140 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 94 [2018-12-03 15:36:11,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:36:11,141 INFO L225 Difference]: With dead ends: 99 [2018-12-03 15:36:11,141 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 15:36:11,143 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 275 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4278 ImplicationChecksByTransitivity, 42.3s TimeCoverageRelationStatistics Valid=29490, Invalid=46962, Unknown=0, NotChecked=0, Total=76452 [2018-12-03 15:36:11,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 15:36:11,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-12-03 15:36:11,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-12-03 15:36:11,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2018-12-03 15:36:11,150 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2018-12-03 15:36:11,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:36:11,150 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2018-12-03 15:36:11,150 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 15:36:11,150 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2018-12-03 15:36:11,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-12-03 15:36:11,151 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:36:11,151 INFO L402 BasicCegarLoop]: trace histogram [93, 1, 1, 1] [2018-12-03 15:36:11,151 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:36:11,151 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:36:11,152 INFO L82 PathProgramCache]: Analyzing trace with hash 1249912492, now seen corresponding path program 47 times [2018-12-03 15:36:11,152 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:36:11,152 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:36:11,152 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:36:11,152 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:36:11,153 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:36:11,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:36:16,891 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 15:36:16,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:36:16,892 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:36:16,892 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:36:16,892 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:36:16,892 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:36:16,892 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 15:36:16,901 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 15:36:16,902 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 15:36:16,980 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-12-03 15:36:16,980 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:36:16,988 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:36:17,216 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 15:36:17,216 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:36:29,621 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 15:36:29,640 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:36:29,640 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 189 [2018-12-03 15:36:29,640 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:36:29,641 INFO L459 AbstractCegarLoop]: Interpolant automaton has 97 states [2018-12-03 15:36:29,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2018-12-03 15:36:29,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13305, Invalid=22605, Unknown=0, NotChecked=0, Total=35910 [2018-12-03 15:36:29,642 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 97 states. [2018-12-03 15:36:29,969 WARN L180 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 8 [2018-12-03 15:36:30,308 WARN L180 SmtUtils]: Spent 317.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 9 [2018-12-03 15:36:30,668 WARN L180 SmtUtils]: Spent 319.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 15:36:30,997 WARN L180 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 15:36:31,332 WARN L180 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 15:36:31,660 WARN L180 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 15:36:31,991 WARN L180 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 15:36:32,325 WARN L180 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 15:36:32,670 WARN L180 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 15:36:32,996 WARN L180 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 15:36:33,343 WARN L180 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 15:36:33,721 WARN L180 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 15:36:34,057 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 15:36:34,396 WARN L180 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 15:36:34,740 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:36:35,110 WARN L180 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:36:35,493 WARN L180 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:36:35,858 WARN L180 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:36:36,211 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:36:36,568 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:36:36,931 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:36:37,313 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:36:37,677 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:36:38,032 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:36:38,396 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:36:38,754 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:36:39,117 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:36:39,488 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:36:39,850 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:36:40,226 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:36:40,613 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:36:40,982 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:36:41,341 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:36:41,699 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:36:42,053 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:36:42,411 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:36:42,762 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:36:43,121 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:36:43,471 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:36:43,794 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:36:44,124 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:36:44,452 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:36:44,781 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:36:45,105 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:36:45,437 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:36:45,784 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:36:46,127 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:36:46,459 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-12-03 15:36:46,779 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 15:36:57,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:36:57,641 INFO L93 Difference]: Finished difference Result 101 states and 102 transitions. [2018-12-03 15:36:57,641 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-12-03 15:36:57,642 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 96 [2018-12-03 15:36:57,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:36:57,642 INFO L225 Difference]: With dead ends: 101 [2018-12-03 15:36:57,642 INFO L226 Difference]: Without dead ends: 99 [2018-12-03 15:36:57,645 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 281 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4465 ImplicationChecksByTransitivity, 45.1s TimeCoverageRelationStatistics Valid=30789, Invalid=49017, Unknown=0, NotChecked=0, Total=79806 [2018-12-03 15:36:57,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-12-03 15:36:57,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-12-03 15:36:57,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-12-03 15:36:57,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-12-03 15:36:57,650 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2018-12-03 15:36:57,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:36:57,651 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-12-03 15:36:57,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has 97 states. [2018-12-03 15:36:57,651 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-12-03 15:36:57,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-12-03 15:36:57,651 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:36:57,651 INFO L402 BasicCegarLoop]: trace histogram [95, 1, 1, 1] [2018-12-03 15:36:57,651 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:36:57,652 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:36:57,652 INFO L82 PathProgramCache]: Analyzing trace with hash -1424880244, now seen corresponding path program 48 times [2018-12-03 15:36:57,652 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:36:57,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:36:57,653 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:36:57,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:36:57,653 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:36:58,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:37:02,791 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 15:37:02,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:37:02,791 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:37:02,792 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:37:02,792 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:37:02,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:37:02,792 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 15:37:02,801 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 15:37:02,801 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 15:37:03,544 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 15:37:03,544 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 15:37:03,978 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:37:04,275 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 15:37:04,276 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:37:17,434 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 15:37:17,455 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:37:17,455 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 193 [2018-12-03 15:37:17,455 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:37:17,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-12-03 15:37:17,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-12-03 15:37:17,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13876, Invalid=23566, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 15:37:17,457 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 99 states. [2018-12-03 15:37:17,834 WARN L180 SmtUtils]: Spent 324.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 8 [2018-12-03 15:37:18,174 WARN L180 SmtUtils]: Spent 316.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 9 [2018-12-03 15:37:18,523 WARN L180 SmtUtils]: Spent 313.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2018-12-03 15:37:18,866 WARN L180 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2018-12-03 15:37:19,223 WARN L180 SmtUtils]: Spent 304.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 15:37:19,562 WARN L180 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 15:37:19,933 WARN L180 SmtUtils]: Spent 308.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 15:37:20,290 WARN L180 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 15:37:20,654 WARN L180 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 15:37:21,027 WARN L180 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 15:37:21,398 WARN L180 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 15:37:21,786 WARN L180 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 15:37:22,171 WARN L180 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 15:37:22,528 WARN L180 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 15:37:22,910 WARN L180 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 15:37:23,300 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 15:37:23,681 WARN L180 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:37:24,077 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:37:24,482 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2018-12-03 15:37:24,874 WARN L180 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2018-12-03 15:37:25,276 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2018-12-03 15:37:25,672 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2018-12-03 15:37:26,072 WARN L180 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2018-12-03 15:37:26,486 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-12-03 15:37:26,915 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-12-03 15:37:27,333 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-12-03 15:37:27,729 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-12-03 15:37:28,124 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-12-03 15:37:28,528 WARN L180 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-12-03 15:37:28,926 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-12-03 15:37:29,319 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-12-03 15:37:29,707 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-12-03 15:37:30,116 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-12-03 15:37:30,516 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-12-03 15:37:30,907 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-12-03 15:37:31,301 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-12-03 15:37:31,708 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-12-03 15:37:32,100 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-12-03 15:37:32,485 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-12-03 15:37:32,901 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-12-03 15:37:33,271 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-12-03 15:37:33,648 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-12-03 15:37:34,006 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-12-03 15:37:34,370 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-12-03 15:37:34,723 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-12-03 15:37:35,084 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-12-03 15:37:35,448 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-12-03 15:37:35,792 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-12-03 15:37:36,139 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-12-03 15:37:36,877 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-12-03 15:37:48,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 15:37:48,007 INFO L93 Difference]: Finished difference Result 103 states and 104 transitions. [2018-12-03 15:37:48,008 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 15:37:48,008 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 98 [2018-12-03 15:37:48,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 15:37:48,009 INFO L225 Difference]: With dead ends: 103 [2018-12-03 15:37:48,009 INFO L226 Difference]: Without dead ends: 101 [2018-12-03 15:37:48,011 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 287 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4656 ImplicationChecksByTransitivity, 47.8s TimeCoverageRelationStatistics Valid=32116, Invalid=51116, Unknown=0, NotChecked=0, Total=83232 [2018-12-03 15:37:48,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2018-12-03 15:37:48,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2018-12-03 15:37:48,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-12-03 15:37:48,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2018-12-03 15:37:48,016 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2018-12-03 15:37:48,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 15:37:48,016 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2018-12-03 15:37:48,016 INFO L481 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-12-03 15:37:48,017 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2018-12-03 15:37:48,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-12-03 15:37:48,017 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 15:37:48,017 INFO L402 BasicCegarLoop]: trace histogram [97, 1, 1, 1] [2018-12-03 15:37:48,017 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 15:37:48,017 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 15:37:48,018 INFO L82 PathProgramCache]: Analyzing trace with hash 784710764, now seen corresponding path program 49 times [2018-12-03 15:37:48,018 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 15:37:48,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:37:48,018 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 15:37:48,019 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 15:37:48,019 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 15:37:48,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:37:54,021 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 15:37:54,022 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:37:54,022 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 15:37:54,022 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 15:37:54,022 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 15:37:54,022 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 15:37:54,022 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 15:37:54,031 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 15:37:54,031 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 15:37:54,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 15:37:55,399 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 15:37:56,534 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 15:37:56,534 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 15:38:10,150 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 15:38:10,171 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 15:38:10,171 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 197 [2018-12-03 15:38:10,172 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 15:38:10,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 15:38:10,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 15:38:10,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14459, Invalid=24547, Unknown=0, NotChecked=0, Total=39006 [2018-12-03 15:38:10,173 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 101 states. [2018-12-03 15:38:10,533 WARN L180 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 8 [2018-12-03 15:38:10,871 WARN L180 SmtUtils]: Spent 314.00 ms on a formula simplification. DAG size of input: 297 DAG size of output: 9 [2018-12-03 15:38:11,247 WARN L180 SmtUtils]: Spent 341.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2018-12-03 15:38:11,603 WARN L180 SmtUtils]: Spent 315.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2018-12-03 15:38:11,962 WARN L180 SmtUtils]: Spent 310.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2018-12-03 15:38:12,323 WARN L180 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2018-12-03 15:38:12,718 WARN L180 SmtUtils]: Spent 331.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2018-12-03 15:38:13,098 WARN L180 SmtUtils]: Spent 302.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2018-12-03 15:38:13,482 WARN L180 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2018-12-03 15:38:13,868 WARN L180 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2018-12-03 15:38:14,250 WARN L180 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2018-12-03 15:38:14,625 WARN L180 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2018-12-03 15:38:15,011 WARN L180 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2018-12-03 15:38:15,389 WARN L180 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2018-12-03 15:38:15,797 WARN L180 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2018-12-03 15:38:16,211 WARN L180 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2018-12-03 15:38:16,606 WARN L180 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2018-12-03 15:38:17,012 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2018-12-03 15:38:17,437 WARN L180 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2018-12-03 15:38:17,859 WARN L180 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2018-12-03 15:38:18,279 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11