java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_exp_cong.epf -i ../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/ArrayInit02.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 16:48:43,822 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 16:48:43,824 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 16:48:43,835 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2018-12-03 16:48:43,869 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_exp_cong.epf [2018-12-03 16:48:43,884 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 16:48:43,884 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 16:48:43,885 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 16:48:43,885 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 16:48:43,885 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 16:48:43,886 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 16:48:43,886 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 16:48:43,886 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 16:48:43,886 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-03 16:48:43,886 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 16:48:43,887 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-03 16:48:43,887 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 16:48:43,887 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 16:48:43,887 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 16:48:43,887 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 16:48:43,888 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 16:48:43,888 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 16:48:43,888 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 16:48:43,889 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 16:48:43,889 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 16:48:43,889 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 16:48:43,889 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 16:48:43,889 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 16:48:43,889 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 16:48:43,890 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 16:48:43,890 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 16:48:43,890 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 16:48:43,890 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 16:48:43,890 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 16:48:43,891 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 16:48:43,891 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 16:48:43,891 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 16:48:43,891 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 16:48:43,892 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 16:48:43,892 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 16:48:43,892 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 16:48:43,892 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 16:48:43,892 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 16:48:43,893 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 16:48:43,893 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 16:48:43,893 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 16:48:43,934 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 16:48:43,946 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 16:48:43,950 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 16:48:43,952 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 16:48:43,952 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 16:48:43,953 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/ArrayInit02.bpl [2018-12-03 16:48:43,953 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/ArrayInit02.bpl' [2018-12-03 16:48:43,991 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 16:48:43,993 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 16:48:43,993 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 16:48:43,994 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 16:48:43,994 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 16:48:44,010 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:48:43" (1/1) ... [2018-12-03 16:48:44,021 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:48:43" (1/1) ... [2018-12-03 16:48:44,028 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 16:48:44,029 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 16:48:44,029 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 16:48:44,029 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 16:48:44,041 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:48:43" (1/1) ... [2018-12-03 16:48:44,041 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:48:43" (1/1) ... [2018-12-03 16:48:44,041 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:48:43" (1/1) ... [2018-12-03 16:48:44,042 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:48:43" (1/1) ... [2018-12-03 16:48:44,044 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:48:43" (1/1) ... [2018-12-03 16:48:44,049 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:48:43" (1/1) ... [2018-12-03 16:48:44,050 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:48:43" (1/1) ... [2018-12-03 16:48:44,051 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 16:48:44,052 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 16:48:44,052 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 16:48:44,052 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 16:48:44,053 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:48:43" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 16:48:44,116 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2018-12-03 16:48:44,116 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 16:48:44,116 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 16:48:44,477 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 16:48:44,478 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-03 16:48:44,478 INFO L202 PluginConnector]: Adding new model ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 04:48:44 BoogieIcfgContainer [2018-12-03 16:48:44,479 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 16:48:44,480 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 16:48:44,480 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 16:48:44,484 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 16:48:44,484 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:48:43" (1/2) ... [2018-12-03 16:48:44,485 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73509a27 and model type ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 04:48:44, skipping insertion in model container [2018-12-03 16:48:44,485 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 04:48:44" (2/2) ... [2018-12-03 16:48:44,487 INFO L112 eAbstractionObserver]: Analyzing ICFG ArrayInit02.bpl [2018-12-03 16:48:44,497 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 16:48:44,506 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 16:48:44,524 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 16:48:44,562 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 16:48:44,562 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 16:48:44,562 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 16:48:44,563 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 16:48:44,563 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 16:48:44,563 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 16:48:44,563 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 16:48:44,563 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 16:48:44,580 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2018-12-03 16:48:44,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 16:48:44,586 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:44,587 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-12-03 16:48:44,590 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:44,597 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:44,597 INFO L82 PathProgramCache]: Analyzing trace with hash 900035954, now seen corresponding path program 1 times [2018-12-03 16:48:44,599 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:44,645 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:44,646 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:44,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:44,646 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:44,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:44,835 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:44,838 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:48:44,838 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 16:48:44,838 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:48:44,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 16:48:44,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 16:48:44,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-03 16:48:44,863 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 4 states. [2018-12-03 16:48:45,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:45,042 INFO L93 Difference]: Finished difference Result 26 states and 34 transitions. [2018-12-03 16:48:45,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 16:48:45,044 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-12-03 16:48:45,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:45,054 INFO L225 Difference]: With dead ends: 26 [2018-12-03 16:48:45,055 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 16:48:45,058 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-12-03 16:48:45,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 16:48:45,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2018-12-03 16:48:45,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-12-03 16:48:45,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 14 transitions. [2018-12-03 16:48:45,089 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 14 transitions. Word has length 6 [2018-12-03 16:48:45,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:45,090 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 14 transitions. [2018-12-03 16:48:45,090 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 16:48:45,090 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 14 transitions. [2018-12-03 16:48:45,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-03 16:48:45,090 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:45,091 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:48:45,091 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:45,091 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:45,091 INFO L82 PathProgramCache]: Analyzing trace with hash 429804648, now seen corresponding path program 1 times [2018-12-03 16:48:45,092 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:45,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:45,093 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:45,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:45,093 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:45,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:45,194 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:45,194 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:48:45,195 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-12-03 16:48:45,195 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:48:45,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 16:48:45,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 16:48:45,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-03 16:48:45,197 INFO L87 Difference]: Start difference. First operand 11 states and 14 transitions. Second operand 4 states. [2018-12-03 16:48:45,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:45,309 INFO L93 Difference]: Finished difference Result 25 states and 31 transitions. [2018-12-03 16:48:45,310 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 16:48:45,310 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2018-12-03 16:48:45,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:45,311 INFO L225 Difference]: With dead ends: 25 [2018-12-03 16:48:45,311 INFO L226 Difference]: Without dead ends: 23 [2018-12-03 16:48:45,313 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-12-03 16:48:45,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-12-03 16:48:45,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 19. [2018-12-03 16:48:45,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 16:48:45,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 26 transitions. [2018-12-03 16:48:45,318 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 26 transitions. Word has length 9 [2018-12-03 16:48:45,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:45,319 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 26 transitions. [2018-12-03 16:48:45,319 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 16:48:45,319 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 26 transitions. [2018-12-03 16:48:45,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-03 16:48:45,320 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:45,320 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:48:45,321 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:45,321 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:45,321 INFO L82 PathProgramCache]: Analyzing trace with hash 429806570, now seen corresponding path program 1 times [2018-12-03 16:48:45,321 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:45,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:45,322 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:45,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:45,323 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:45,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:45,368 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 16:48:45,368 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:48:45,369 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 16:48:45,369 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:48:45,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 16:48:45,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 16:48:45,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 16:48:45,370 INFO L87 Difference]: Start difference. First operand 19 states and 26 transitions. Second operand 3 states. [2018-12-03 16:48:45,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:45,480 INFO L93 Difference]: Finished difference Result 24 states and 31 transitions. [2018-12-03 16:48:45,481 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 16:48:45,481 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2018-12-03 16:48:45,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:45,481 INFO L225 Difference]: With dead ends: 24 [2018-12-03 16:48:45,482 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 16:48:45,482 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 16:48:45,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 16:48:45,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2018-12-03 16:48:45,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-12-03 16:48:45,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2018-12-03 16:48:45,485 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2018-12-03 16:48:45,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:45,486 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2018-12-03 16:48:45,486 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 16:48:45,486 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2018-12-03 16:48:45,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-03 16:48:45,486 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:45,487 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:48:45,487 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:45,487 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:45,487 INFO L82 PathProgramCache]: Analyzing trace with hash -2090155286, now seen corresponding path program 1 times [2018-12-03 16:48:45,488 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:45,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:45,489 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:45,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:45,489 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:45,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:45,809 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 15 [2018-12-03 16:48:45,856 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:45,856 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:45,857 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:45,858 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 10 with the following transitions: [2018-12-03 16:48:45,860 INFO L205 CegarAbsIntRunner]: [0], [4], [9], [11], [13], [17], [20], [26], [27] [2018-12-03 16:48:45,894 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:48:45,894 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:48:46,059 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:48:46,061 INFO L272 AbstractInterpreter]: Visited 9 different actions 23 times. Merged at 8 different actions 13 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 16:48:46,074 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:46,075 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:48:46,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:46,075 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:46,095 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:46,096 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:48:46,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:46,134 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:46,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:46,391 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:46,468 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 16:48:46,488 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:46,489 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 6 [2018-12-03 16:48:46,489 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:46,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:48:46,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:48:46,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-12-03 16:48:46,492 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 7 states. [2018-12-03 16:48:46,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:46,748 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2018-12-03 16:48:46,749 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 16:48:46,749 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2018-12-03 16:48:46,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:46,750 INFO L225 Difference]: With dead ends: 26 [2018-12-03 16:48:46,750 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 16:48:46,751 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2018-12-03 16:48:46,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 16:48:46,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 14. [2018-12-03 16:48:46,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-12-03 16:48:46,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2018-12-03 16:48:46,755 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 9 [2018-12-03 16:48:46,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:46,756 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2018-12-03 16:48:46,756 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:48:46,756 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2018-12-03 16:48:46,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 16:48:46,757 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:46,757 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:48:46,757 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:46,757 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:46,758 INFO L82 PathProgramCache]: Analyzing trace with hash -368470767, now seen corresponding path program 1 times [2018-12-03 16:48:46,758 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:46,759 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:46,759 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:46,759 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:46,759 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:46,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:46,840 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:46,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:46,841 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:46,841 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 16:48:46,842 INFO L205 CegarAbsIntRunner]: [0], [4], [9], [11], [13], [17], [20], [22], [26], [27], [30], [32] [2018-12-03 16:48:46,843 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:48:46,843 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:48:46,974 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:48:46,974 INFO L272 AbstractInterpreter]: Visited 12 different actions 51 times. Merged at 11 different actions 31 times. Widened at 1 different actions 1 times. Found 11 fixpoints after 6 different actions. Largest state had 0 variables. [2018-12-03 16:48:46,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:46,992 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:48:46,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:46,992 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:47,001 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:47,001 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:48:47,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:47,008 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:47,155 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:47,155 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:47,194 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:47,215 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:47,215 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 7 [2018-12-03 16:48:47,216 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:47,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 16:48:47,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 16:48:47,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-12-03 16:48:47,217 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 8 states. [2018-12-03 16:48:47,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:47,614 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2018-12-03 16:48:47,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 16:48:47,615 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 13 [2018-12-03 16:48:47,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:47,615 INFO L225 Difference]: With dead ends: 31 [2018-12-03 16:48:47,615 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 16:48:47,616 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2018-12-03 16:48:47,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 16:48:47,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2018-12-03 16:48:47,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-12-03 16:48:47,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2018-12-03 16:48:47,620 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2018-12-03 16:48:47,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:47,620 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2018-12-03 16:48:47,621 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 16:48:47,621 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2018-12-03 16:48:47,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 16:48:47,621 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:47,622 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 16:48:47,622 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:47,622 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:47,622 INFO L82 PathProgramCache]: Analyzing trace with hash -256855911, now seen corresponding path program 2 times [2018-12-03 16:48:47,622 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:47,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:47,623 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:47,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:47,624 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:47,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:47,876 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:47,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:47,877 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:47,877 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:47,877 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:47,878 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:47,878 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:47,897 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:48:47,897 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:48:47,909 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-03 16:48:47,909 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:47,911 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:48,032 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:48,032 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:48,071 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:48,092 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:48,093 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 10 [2018-12-03 16:48:48,093 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:48,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 16:48:48,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 16:48:48,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2018-12-03 16:48:48,094 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 11 states. [2018-12-03 16:48:48,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:48,382 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2018-12-03 16:48:48,384 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 16:48:48,384 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-03 16:48:48,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:48,386 INFO L225 Difference]: With dead ends: 35 [2018-12-03 16:48:48,386 INFO L226 Difference]: Without dead ends: 28 [2018-12-03 16:48:48,386 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 25 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2018-12-03 16:48:48,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-03 16:48:48,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 21. [2018-12-03 16:48:48,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 16:48:48,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2018-12-03 16:48:48,391 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 16 [2018-12-03 16:48:48,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:48,392 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2018-12-03 16:48:48,392 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 16:48:48,392 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2018-12-03 16:48:48,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 16:48:48,393 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:48,393 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2018-12-03 16:48:48,393 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:48,393 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:48,394 INFO L82 PathProgramCache]: Analyzing trace with hash 1110643520, now seen corresponding path program 3 times [2018-12-03 16:48:48,394 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:48,394 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:48,395 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:48,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:48,395 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:48,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:48,504 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:48,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:48,505 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:48,505 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:48,505 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:48,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:48,506 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:48,517 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:48:48,518 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:48:48,526 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:48:48,526 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:48,528 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:48,594 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:48,594 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:48,634 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:48,652 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:48,653 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 10 [2018-12-03 16:48:48,653 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:48,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 16:48:48,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 16:48:48,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2018-12-03 16:48:48,654 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 11 states. [2018-12-03 16:48:48,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:48,834 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2018-12-03 16:48:48,835 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 16:48:48,835 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-12-03 16:48:48,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:48,836 INFO L225 Difference]: With dead ends: 45 [2018-12-03 16:48:48,836 INFO L226 Difference]: Without dead ends: 26 [2018-12-03 16:48:48,837 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 31 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2018-12-03 16:48:48,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-12-03 16:48:48,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2018-12-03 16:48:48,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-03 16:48:48,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2018-12-03 16:48:48,842 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 20 [2018-12-03 16:48:48,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:48,842 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2018-12-03 16:48:48,842 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 16:48:48,842 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2018-12-03 16:48:48,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-03 16:48:48,843 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:48,843 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1] [2018-12-03 16:48:48,844 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:48,844 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:48,844 INFO L82 PathProgramCache]: Analyzing trace with hash -1324912968, now seen corresponding path program 4 times [2018-12-03 16:48:48,844 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:48,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:48,845 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:48,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:48,845 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:48,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:49,248 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:49,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:49,249 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:49,249 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:49,249 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:49,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:49,249 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:49,258 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:49,258 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:48:49,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:49,266 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:49,357 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:49,358 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:49,392 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:49,411 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:49,411 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 13 [2018-12-03 16:48:49,412 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:49,412 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 16:48:49,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 16:48:49,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2018-12-03 16:48:49,413 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 14 states. [2018-12-03 16:48:49,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:49,786 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2018-12-03 16:48:49,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 16:48:49,788 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 23 [2018-12-03 16:48:49,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:49,789 INFO L225 Difference]: With dead ends: 49 [2018-12-03 16:48:49,789 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 16:48:49,790 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=71, Invalid=309, Unknown=0, NotChecked=0, Total=380 [2018-12-03 16:48:49,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 16:48:49,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 28. [2018-12-03 16:48:49,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-03 16:48:49,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2018-12-03 16:48:49,797 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2018-12-03 16:48:49,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:49,797 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2018-12-03 16:48:49,797 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 16:48:49,797 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2018-12-03 16:48:49,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-03 16:48:49,798 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:49,798 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2018-12-03 16:48:49,798 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:49,798 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:49,799 INFO L82 PathProgramCache]: Analyzing trace with hash 1588570591, now seen corresponding path program 5 times [2018-12-03 16:48:49,799 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:49,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:49,800 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:49,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:49,800 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:49,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:49,910 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:49,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:49,911 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:49,911 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:49,911 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:49,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:49,911 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:49,920 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:48:49,920 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:48:49,930 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 16:48:49,931 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:49,933 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:49,999 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:50,000 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:50,066 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:50,092 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:50,093 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 13 [2018-12-03 16:48:50,093 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:50,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 16:48:50,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 16:48:50,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2018-12-03 16:48:50,094 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 14 states. [2018-12-03 16:48:50,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:50,318 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2018-12-03 16:48:50,318 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 16:48:50,318 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 27 [2018-12-03 16:48:50,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:50,320 INFO L225 Difference]: With dead ends: 60 [2018-12-03 16:48:50,320 INFO L226 Difference]: Without dead ends: 33 [2018-12-03 16:48:50,321 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 7 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=215, Unknown=0, NotChecked=0, Total=306 [2018-12-03 16:48:50,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-03 16:48:50,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2018-12-03 16:48:50,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-03 16:48:50,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2018-12-03 16:48:50,327 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 27 [2018-12-03 16:48:50,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:50,328 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2018-12-03 16:48:50,328 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 16:48:50,328 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2018-12-03 16:48:50,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-03 16:48:50,329 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:50,329 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1] [2018-12-03 16:48:50,329 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:50,329 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:50,329 INFO L82 PathProgramCache]: Analyzing trace with hash 366737255, now seen corresponding path program 6 times [2018-12-03 16:48:50,329 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:50,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:50,330 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:50,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:50,331 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:50,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:50,551 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 3 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:50,552 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:50,552 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:50,552 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:50,553 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:50,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:50,553 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:50,561 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:48:50,561 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:48:50,572 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:48:50,572 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:50,574 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:50,759 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 3 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:50,760 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:50,802 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 3 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:50,822 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:50,822 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 16 [2018-12-03 16:48:50,823 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:50,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 16:48:50,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 16:48:50,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2018-12-03 16:48:50,824 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 17 states. [2018-12-03 16:48:51,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:51,613 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2018-12-03 16:48:51,613 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 16:48:51,613 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 30 [2018-12-03 16:48:51,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:51,614 INFO L225 Difference]: With dead ends: 64 [2018-12-03 16:48:51,614 INFO L226 Difference]: Without dead ends: 50 [2018-12-03 16:48:51,615 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=95, Invalid=505, Unknown=0, NotChecked=0, Total=600 [2018-12-03 16:48:51,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-12-03 16:48:51,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 35. [2018-12-03 16:48:51,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-12-03 16:48:51,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-12-03 16:48:51,626 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 30 [2018-12-03 16:48:51,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:51,626 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-12-03 16:48:51,626 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 16:48:51,627 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-12-03 16:48:51,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-12-03 16:48:51,627 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:51,628 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2018-12-03 16:48:51,628 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:51,628 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:51,628 INFO L82 PathProgramCache]: Analyzing trace with hash -1079885042, now seen corresponding path program 7 times [2018-12-03 16:48:51,628 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:51,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:51,629 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:51,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:51,629 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:51,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:51,732 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 36 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:51,733 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:51,733 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:51,733 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:51,733 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:51,733 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:51,733 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:51,742 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:51,742 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:48:51,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:51,753 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:51,933 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 36 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:51,933 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:52,053 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 36 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:52,072 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:52,072 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 16 [2018-12-03 16:48:52,072 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:52,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 16:48:52,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 16:48:52,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2018-12-03 16:48:52,074 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 17 states. [2018-12-03 16:48:52,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:52,415 INFO L93 Difference]: Finished difference Result 75 states and 79 transitions. [2018-12-03 16:48:52,415 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 16:48:52,415 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 34 [2018-12-03 16:48:52,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:52,417 INFO L225 Difference]: With dead ends: 75 [2018-12-03 16:48:52,417 INFO L226 Difference]: Without dead ends: 40 [2018-12-03 16:48:52,418 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 53 SyntacticMatches, 9 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2018-12-03 16:48:52,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-03 16:48:52,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2018-12-03 16:48:52,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-12-03 16:48:52,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-12-03 16:48:52,426 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 34 [2018-12-03 16:48:52,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:52,426 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-12-03 16:48:52,426 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 16:48:52,426 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-12-03 16:48:52,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-12-03 16:48:52,427 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:52,428 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1] [2018-12-03 16:48:52,428 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:52,428 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:52,428 INFO L82 PathProgramCache]: Analyzing trace with hash -921359226, now seen corresponding path program 8 times [2018-12-03 16:48:52,428 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:52,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:52,429 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:52,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:52,430 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:52,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:52,769 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 4 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:52,769 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:52,769 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:52,770 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:52,770 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:52,770 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:52,770 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:52,778 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:48:52,779 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:48:52,863 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-03 16:48:52,864 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:52,866 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:53,585 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 32 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:53,586 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:54,241 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 28 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:54,261 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:54,261 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 14] total 33 [2018-12-03 16:48:54,261 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:54,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 16:48:54,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 16:48:54,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=961, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 16:48:54,264 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 27 states. [2018-12-03 16:48:56,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:56,532 INFO L93 Difference]: Finished difference Result 97 states and 103 transitions. [2018-12-03 16:48:56,532 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 16:48:56,532 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 37 [2018-12-03 16:48:56,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:56,534 INFO L225 Difference]: With dead ends: 97 [2018-12-03 16:48:56,534 INFO L226 Difference]: Without dead ends: 58 [2018-12-03 16:48:56,537 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 47 SyntacticMatches, 6 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 855 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=499, Invalid=3533, Unknown=0, NotChecked=0, Total=4032 [2018-12-03 16:48:56,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-03 16:48:56,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 45. [2018-12-03 16:48:56,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 16:48:56,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2018-12-03 16:48:56,544 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 37 [2018-12-03 16:48:56,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:56,544 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2018-12-03 16:48:56,545 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 16:48:56,545 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2018-12-03 16:48:56,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-03 16:48:56,546 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:56,546 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1] [2018-12-03 16:48:56,546 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:56,546 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:56,546 INFO L82 PathProgramCache]: Analyzing trace with hash -1868574667, now seen corresponding path program 9 times [2018-12-03 16:48:56,547 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:56,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:56,547 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:56,548 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:56,548 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:56,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:57,012 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 5 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:57,012 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:57,012 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:57,012 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:57,012 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:57,012 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:57,013 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:57,021 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:48:57,021 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:48:57,028 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:48:57,029 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:48:57,032 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:57,406 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 5 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:57,406 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:57,440 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 5 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:57,459 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:57,459 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 22 [2018-12-03 16:48:57,459 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:57,460 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 16:48:57,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 16:48:57,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=448, Unknown=0, NotChecked=0, Total=506 [2018-12-03 16:48:57,460 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 23 states. [2018-12-03 16:48:58,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:58,776 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2018-12-03 16:48:58,776 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 16:48:58,777 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 44 [2018-12-03 16:48:58,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:58,778 INFO L225 Difference]: With dead ends: 94 [2018-12-03 16:48:58,779 INFO L226 Difference]: Without dead ends: 72 [2018-12-03 16:48:58,780 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=149, Invalid=1041, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 16:48:58,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-12-03 16:48:58,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 49. [2018-12-03 16:48:58,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-03 16:48:58,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2018-12-03 16:48:58,789 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 44 [2018-12-03 16:48:58,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:58,789 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2018-12-03 16:48:58,789 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 16:48:58,789 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2018-12-03 16:48:58,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 16:48:58,790 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:58,790 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1] [2018-12-03 16:48:58,791 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:58,791 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:58,791 INFO L82 PathProgramCache]: Analyzing trace with hash 269550812, now seen corresponding path program 10 times [2018-12-03 16:48:58,791 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:58,792 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:58,792 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:48:58,792 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:58,792 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:58,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:58,951 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:58,952 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:58,952 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:58,952 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:58,952 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:58,952 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:58,952 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:58,960 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:58,961 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:48:58,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:58,974 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:48:59,182 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:59,183 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:48:59,268 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:59,289 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:48:59,289 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 22 [2018-12-03 16:48:59,290 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:48:59,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 16:48:59,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 16:48:59,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-12-03 16:48:59,291 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 23 states. [2018-12-03 16:48:59,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:48:59,602 INFO L93 Difference]: Finished difference Result 105 states and 109 transitions. [2018-12-03 16:48:59,602 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 16:48:59,602 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 48 [2018-12-03 16:48:59,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:48:59,603 INFO L225 Difference]: With dead ends: 105 [2018-12-03 16:48:59,603 INFO L226 Difference]: Without dead ends: 54 [2018-12-03 16:48:59,605 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 75 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=232, Invalid=638, Unknown=0, NotChecked=0, Total=870 [2018-12-03 16:48:59,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-12-03 16:48:59,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2018-12-03 16:48:59,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-12-03 16:48:59,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2018-12-03 16:48:59,614 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 48 [2018-12-03 16:48:59,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:48:59,614 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2018-12-03 16:48:59,614 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 16:48:59,614 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2018-12-03 16:48:59,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-12-03 16:48:59,615 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:48:59,615 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1] [2018-12-03 16:48:59,616 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:48:59,616 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:48:59,616 INFO L82 PathProgramCache]: Analyzing trace with hash 2089942100, now seen corresponding path program 11 times [2018-12-03 16:48:59,616 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:48:59,617 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:59,617 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:48:59,617 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:48:59,617 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:48:59,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:48:59,977 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 6 proven. 142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:48:59,978 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:59,978 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:48:59,978 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:48:59,978 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:48:59,978 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:48:59,978 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:48:59,987 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:48:59,987 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:49:00,045 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-12-03 16:49:00,046 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:00,048 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:00,273 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 6 proven. 142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:00,273 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:00,322 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 6 proven. 142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:00,341 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:00,341 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 25 [2018-12-03 16:49:00,341 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:00,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 16:49:00,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 16:49:00,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=584, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:49:00,343 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 26 states. [2018-12-03 16:49:01,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:01,778 INFO L93 Difference]: Finished difference Result 109 states and 114 transitions. [2018-12-03 16:49:01,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 16:49:01,778 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 51 [2018-12-03 16:49:01,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:01,779 INFO L225 Difference]: With dead ends: 109 [2018-12-03 16:49:01,779 INFO L226 Difference]: Without dead ends: 83 [2018-12-03 16:49:01,781 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=179, Invalid=1381, Unknown=0, NotChecked=0, Total=1560 [2018-12-03 16:49:01,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-12-03 16:49:01,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 56. [2018-12-03 16:49:01,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-12-03 16:49:01,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2018-12-03 16:49:01,790 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 51 [2018-12-03 16:49:01,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:01,791 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2018-12-03 16:49:01,791 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 16:49:01,791 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2018-12-03 16:49:01,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-12-03 16:49:01,792 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:01,792 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1] [2018-12-03 16:49:01,792 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:01,792 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:01,792 INFO L82 PathProgramCache]: Analyzing trace with hash 549587323, now seen corresponding path program 12 times [2018-12-03 16:49:01,793 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:01,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:01,793 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:01,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:01,794 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:01,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:02,050 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 105 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:02,051 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:02,051 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:02,051 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:02,051 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:02,051 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:02,051 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:49:02,061 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:49:02,061 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:49:02,073 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:49:02,073 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:02,075 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:02,385 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 105 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:02,386 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:02,689 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 105 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:02,708 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:02,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 25 [2018-12-03 16:49:02,708 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:02,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 16:49:02,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 16:49:02,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2018-12-03 16:49:02,709 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 26 states. [2018-12-03 16:49:03,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:03,013 INFO L93 Difference]: Finished difference Result 120 states and 124 transitions. [2018-12-03 16:49:03,017 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 16:49:03,017 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 55 [2018-12-03 16:49:03,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:03,018 INFO L225 Difference]: With dead ends: 120 [2018-12-03 16:49:03,018 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 16:49:03,019 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 86 SyntacticMatches, 15 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=293, Invalid=829, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 16:49:03,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 16:49:03,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2018-12-03 16:49:03,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-12-03 16:49:03,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2018-12-03 16:49:03,029 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 55 [2018-12-03 16:49:03,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:03,029 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2018-12-03 16:49:03,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 16:49:03,030 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2018-12-03 16:49:03,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-12-03 16:49:03,031 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:03,031 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1] [2018-12-03 16:49:03,031 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:03,031 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:03,031 INFO L82 PathProgramCache]: Analyzing trace with hash -1743111421, now seen corresponding path program 13 times [2018-12-03 16:49:03,032 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:03,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:03,032 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:03,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:03,033 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:03,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:03,459 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 7 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:03,459 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:03,460 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:03,460 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:03,460 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:03,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:03,460 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:49:03,470 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:03,470 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:49:03,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:03,484 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:03,721 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 7 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:03,721 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:03,795 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 7 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:03,813 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:03,814 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 28 [2018-12-03 16:49:03,814 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:03,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 16:49:03,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 16:49:03,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=738, Unknown=0, NotChecked=0, Total=812 [2018-12-03 16:49:03,815 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 29 states. [2018-12-03 16:49:05,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:05,343 INFO L93 Difference]: Finished difference Result 124 states and 129 transitions. [2018-12-03 16:49:05,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 16:49:05,344 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 58 [2018-12-03 16:49:05,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:05,345 INFO L225 Difference]: With dead ends: 124 [2018-12-03 16:49:05,345 INFO L226 Difference]: Without dead ends: 94 [2018-12-03 16:49:05,347 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 103 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=211, Invalid=1769, Unknown=0, NotChecked=0, Total=1980 [2018-12-03 16:49:05,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-12-03 16:49:05,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 63. [2018-12-03 16:49:05,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-03 16:49:05,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2018-12-03 16:49:05,356 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 58 [2018-12-03 16:49:05,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:05,356 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2018-12-03 16:49:05,356 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 16:49:05,356 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2018-12-03 16:49:05,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 16:49:05,357 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:05,357 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1] [2018-12-03 16:49:05,358 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:05,358 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:05,358 INFO L82 PathProgramCache]: Analyzing trace with hash -1415751510, now seen corresponding path program 14 times [2018-12-03 16:49:05,358 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:05,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:05,359 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:05,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:05,359 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:05,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:05,591 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 136 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:05,591 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:05,591 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:05,592 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:05,592 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:05,592 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:05,592 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:49:05,601 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:49:05,601 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:49:05,617 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-03 16:49:05,617 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:05,619 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:05,828 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 136 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:05,829 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:05,959 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 136 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:05,980 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:05,980 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 28 [2018-12-03 16:49:05,980 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:05,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 16:49:05,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 16:49:05,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2018-12-03 16:49:05,981 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand 29 states. [2018-12-03 16:49:06,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:06,376 INFO L93 Difference]: Finished difference Result 135 states and 139 transitions. [2018-12-03 16:49:06,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 16:49:06,376 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2018-12-03 16:49:06,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:06,377 INFO L225 Difference]: With dead ends: 135 [2018-12-03 16:49:06,377 INFO L226 Difference]: Without dead ends: 68 [2018-12-03 16:49:06,378 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 97 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=361, Invalid=1045, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 16:49:06,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-12-03 16:49:06,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2018-12-03 16:49:06,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-12-03 16:49:06,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2018-12-03 16:49:06,388 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 62 [2018-12-03 16:49:06,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:06,388 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2018-12-03 16:49:06,388 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 16:49:06,388 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2018-12-03 16:49:06,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-12-03 16:49:06,389 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:06,389 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1] [2018-12-03 16:49:06,390 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:06,390 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:06,390 INFO L82 PathProgramCache]: Analyzing trace with hash 175889954, now seen corresponding path program 15 times [2018-12-03 16:49:06,390 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:06,391 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:06,391 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:06,391 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:06,391 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:06,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:06,820 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 8 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:06,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:06,821 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:06,821 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:06,821 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:06,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:06,821 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:49:06,830 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:49:06,830 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:49:06,844 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:49:06,844 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:06,848 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:07,227 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 8 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:07,227 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:07,369 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 8 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:07,387 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:07,387 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 31 [2018-12-03 16:49:07,387 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:07,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 16:49:07,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 16:49:07,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=910, Unknown=0, NotChecked=0, Total=992 [2018-12-03 16:49:07,388 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 32 states. [2018-12-03 16:49:09,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:09,308 INFO L93 Difference]: Finished difference Result 139 states and 144 transitions. [2018-12-03 16:49:09,308 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 16:49:09,308 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 65 [2018-12-03 16:49:09,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:09,309 INFO L225 Difference]: With dead ends: 139 [2018-12-03 16:49:09,309 INFO L226 Difference]: Without dead ends: 105 [2018-12-03 16:49:09,311 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 116 SyntacticMatches, 3 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=245, Invalid=2205, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 16:49:09,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-12-03 16:49:09,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 70. [2018-12-03 16:49:09,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-12-03 16:49:09,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2018-12-03 16:49:09,321 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 65 [2018-12-03 16:49:09,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:09,321 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2018-12-03 16:49:09,322 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 16:49:09,322 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2018-12-03 16:49:09,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-12-03 16:49:09,322 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:09,322 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1] [2018-12-03 16:49:09,323 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:09,323 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:09,323 INFO L82 PathProgramCache]: Analyzing trace with hash 2774089, now seen corresponding path program 16 times [2018-12-03 16:49:09,323 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:09,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:09,324 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:09,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:09,324 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:09,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:09,733 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 171 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:09,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:09,734 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:09,734 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:09,734 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:09,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:09,734 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:49:09,743 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:09,743 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:49:09,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:09,758 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:10,166 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 171 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:10,167 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:10,382 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 171 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:10,402 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:10,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 31 [2018-12-03 16:49:10,402 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:10,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 16:49:10,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 16:49:10,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2018-12-03 16:49:10,403 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 32 states. [2018-12-03 16:49:10,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:10,864 INFO L93 Difference]: Finished difference Result 150 states and 154 transitions. [2018-12-03 16:49:10,865 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-03 16:49:10,865 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 69 [2018-12-03 16:49:10,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:10,866 INFO L225 Difference]: With dead ends: 150 [2018-12-03 16:49:10,866 INFO L226 Difference]: Without dead ends: 75 [2018-12-03 16:49:10,867 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 108 SyntacticMatches, 19 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=436, Invalid=1286, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 16:49:10,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-12-03 16:49:10,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2018-12-03 16:49:10,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-03 16:49:10,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2018-12-03 16:49:10,877 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 69 [2018-12-03 16:49:10,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:10,877 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2018-12-03 16:49:10,877 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 16:49:10,877 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2018-12-03 16:49:10,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 16:49:10,878 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:10,878 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 1, 1, 1, 1, 1] [2018-12-03 16:49:10,878 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:10,879 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:10,879 INFO L82 PathProgramCache]: Analyzing trace with hash 2036938705, now seen corresponding path program 17 times [2018-12-03 16:49:10,879 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:10,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:10,880 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:10,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:10,880 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:10,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:11,388 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 9 proven. 307 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:11,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:11,389 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:11,389 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:11,389 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:11,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:11,389 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:49:11,398 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:49:11,399 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:49:11,415 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-12-03 16:49:11,415 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:11,417 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:12,298 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 162 proven. 154 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:12,299 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:13,292 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 153 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:13,312 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:13,312 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24, 24] total 58 [2018-12-03 16:49:13,312 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:13,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 16:49:13,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 16:49:13,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=421, Invalid=3001, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 16:49:13,314 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand 47 states. [2018-12-03 16:49:15,812 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2018-12-03 16:49:17,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:17,936 INFO L93 Difference]: Finished difference Result 192 states and 198 transitions. [2018-12-03 16:49:17,937 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-03 16:49:17,937 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 72 [2018-12-03 16:49:17,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:17,938 INFO L225 Difference]: With dead ends: 192 [2018-12-03 16:49:17,938 INFO L226 Difference]: Without dead ends: 113 [2018-12-03 16:49:17,942 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 97 SyntacticMatches, 11 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3015 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=1319, Invalid=12723, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 16:49:17,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2018-12-03 16:49:17,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 80. [2018-12-03 16:49:17,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-12-03 16:49:17,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2018-12-03 16:49:17,952 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 72 [2018-12-03 16:49:17,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:17,952 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2018-12-03 16:49:17,952 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 16:49:17,953 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2018-12-03 16:49:17,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-12-03 16:49:17,953 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:17,953 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1] [2018-12-03 16:49:17,953 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:17,953 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:17,954 INFO L82 PathProgramCache]: Analyzing trace with hash 1070649840, now seen corresponding path program 18 times [2018-12-03 16:49:17,954 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:17,954 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:17,954 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:17,954 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:17,954 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:17,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:18,982 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 10 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:18,982 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:18,982 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:18,983 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:18,983 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:18,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:18,983 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:49:18,992 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:49:18,992 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:49:19,006 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:49:19,007 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:19,009 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:19,601 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 10 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:19,601 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:19,712 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 10 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:19,732 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:19,732 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 37 [2018-12-03 16:49:19,732 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:19,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 16:49:19,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 16:49:19,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1308, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 16:49:19,734 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 38 states. [2018-12-03 16:49:21,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:21,957 INFO L93 Difference]: Finished difference Result 169 states and 174 transitions. [2018-12-03 16:49:21,959 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 16:49:21,959 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 79 [2018-12-03 16:49:21,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:21,960 INFO L225 Difference]: With dead ends: 169 [2018-12-03 16:49:21,960 INFO L226 Difference]: Without dead ends: 127 [2018-12-03 16:49:21,961 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 142 SyntacticMatches, 3 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=319, Invalid=3221, Unknown=0, NotChecked=0, Total=3540 [2018-12-03 16:49:21,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-12-03 16:49:21,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 84. [2018-12-03 16:49:21,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-12-03 16:49:21,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2018-12-03 16:49:21,970 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 79 [2018-12-03 16:49:21,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:21,971 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2018-12-03 16:49:21,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 16:49:21,971 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2018-12-03 16:49:21,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-12-03 16:49:21,971 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:21,972 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1] [2018-12-03 16:49:21,972 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:21,972 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:21,972 INFO L82 PathProgramCache]: Analyzing trace with hash -685461225, now seen corresponding path program 19 times [2018-12-03 16:49:21,972 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:21,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:21,973 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:21,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:21,973 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:21,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:22,249 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 253 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:22,250 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:22,250 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:22,250 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:22,250 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:22,250 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:22,250 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:49:22,259 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:22,259 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:49:22,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:22,276 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:22,567 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 253 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:22,567 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:22,963 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 253 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:22,982 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:22,982 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 37 [2018-12-03 16:49:22,982 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:22,983 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 16:49:22,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 16:49:22,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 16:49:22,983 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2018-12-03 16:49:23,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:23,534 INFO L93 Difference]: Finished difference Result 180 states and 184 transitions. [2018-12-03 16:49:23,534 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 16:49:23,535 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2018-12-03 16:49:23,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:23,536 INFO L225 Difference]: With dead ends: 180 [2018-12-03 16:49:23,536 INFO L226 Difference]: Without dead ends: 89 [2018-12-03 16:49:23,538 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 130 SyntacticMatches, 23 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 770 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=607, Invalid=1843, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 16:49:23,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-12-03 16:49:23,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2018-12-03 16:49:23,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-03 16:49:23,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2018-12-03 16:49:23,548 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2018-12-03 16:49:23,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:23,548 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2018-12-03 16:49:23,548 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 16:49:23,549 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2018-12-03 16:49:23,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 16:49:23,549 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:23,549 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 1, 1, 1, 1, 1] [2018-12-03 16:49:23,550 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:23,550 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:23,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1750415713, now seen corresponding path program 20 times [2018-12-03 16:49:23,550 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:23,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:23,551 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:23,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:23,551 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:23,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:24,340 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 11 proven. 452 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:24,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:24,340 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:24,341 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:24,341 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:24,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:24,341 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:49:24,353 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:49:24,353 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:49:24,374 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-12-03 16:49:24,374 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:24,376 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:25,469 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 242 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:25,469 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:26,452 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 231 proven. 232 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:26,470 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:26,470 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 28, 28] total 68 [2018-12-03 16:49:26,470 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:26,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 16:49:26,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 16:49:26,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=560, Invalid=4132, Unknown=0, NotChecked=0, Total=4692 [2018-12-03 16:49:26,472 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand 55 states. [2018-12-03 16:49:33,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:33,032 INFO L93 Difference]: Finished difference Result 230 states and 236 transitions. [2018-12-03 16:49:33,032 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-12-03 16:49:33,032 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 86 [2018-12-03 16:49:33,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:33,033 INFO L225 Difference]: With dead ends: 230 [2018-12-03 16:49:33,034 INFO L226 Difference]: Without dead ends: 135 [2018-12-03 16:49:33,037 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 117 SyntacticMatches, 13 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4250 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=1745, Invalid=17995, Unknown=0, NotChecked=0, Total=19740 [2018-12-03 16:49:33,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-12-03 16:49:33,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 94. [2018-12-03 16:49:33,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-12-03 16:49:33,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2018-12-03 16:49:33,050 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 86 [2018-12-03 16:49:33,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:33,051 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2018-12-03 16:49:33,051 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 16:49:33,051 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2018-12-03 16:49:33,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-12-03 16:49:33,052 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:33,052 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1] [2018-12-03 16:49:33,052 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:33,052 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:33,053 INFO L82 PathProgramCache]: Analyzing trace with hash 2005850046, now seen corresponding path program 21 times [2018-12-03 16:49:33,053 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:33,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:33,054 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:33,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:33,054 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:33,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:33,900 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 12 proven. 535 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:33,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:33,900 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:33,900 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:33,900 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:33,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:33,900 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:49:33,909 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:49:33,910 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:49:33,925 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:49:33,926 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:33,928 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:34,434 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 12 proven. 535 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:34,434 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:34,511 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 12 proven. 535 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:34,529 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:34,529 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 43 [2018-12-03 16:49:34,529 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:34,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 16:49:34,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 16:49:34,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1778, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 16:49:34,530 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand 44 states. [2018-12-03 16:49:37,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:37,664 INFO L93 Difference]: Finished difference Result 199 states and 204 transitions. [2018-12-03 16:49:37,664 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 16:49:37,664 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 93 [2018-12-03 16:49:37,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:37,665 INFO L225 Difference]: With dead ends: 199 [2018-12-03 16:49:37,665 INFO L226 Difference]: Without dead ends: 149 [2018-12-03 16:49:37,667 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 168 SyntacticMatches, 3 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 764 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=401, Invalid=4429, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 16:49:37,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-12-03 16:49:37,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 98. [2018-12-03 16:49:37,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-12-03 16:49:37,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 100 transitions. [2018-12-03 16:49:37,680 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 100 transitions. Word has length 93 [2018-12-03 16:49:37,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:37,680 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 100 transitions. [2018-12-03 16:49:37,680 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 16:49:37,680 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 100 transitions. [2018-12-03 16:49:37,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-12-03 16:49:37,681 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:37,681 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1] [2018-12-03 16:49:37,681 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:37,681 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:37,682 INFO L82 PathProgramCache]: Analyzing trace with hash 1370431461, now seen corresponding path program 22 times [2018-12-03 16:49:37,682 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:37,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:37,682 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:37,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:37,683 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:37,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:38,335 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 351 proven. 247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:38,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:38,336 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:38,336 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:38,336 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:38,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:38,336 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:49:38,347 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:38,347 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:49:38,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:38,365 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:38,737 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 351 proven. 247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:38,737 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:40,092 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 351 proven. 247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:40,111 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:40,111 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 43 [2018-12-03 16:49:40,111 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:40,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 16:49:40,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 16:49:40,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 16:49:40,113 INFO L87 Difference]: Start difference. First operand 98 states and 100 transitions. Second operand 44 states. [2018-12-03 16:49:40,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:40,775 INFO L93 Difference]: Finished difference Result 210 states and 214 transitions. [2018-12-03 16:49:40,776 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-12-03 16:49:40,776 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 97 [2018-12-03 16:49:40,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:40,777 INFO L225 Difference]: With dead ends: 210 [2018-12-03 16:49:40,777 INFO L226 Difference]: Without dead ends: 103 [2018-12-03 16:49:40,778 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 152 SyntacticMatches, 27 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1066 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=806, Invalid=2500, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 16:49:40,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-12-03 16:49:40,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 101. [2018-12-03 16:49:40,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-12-03 16:49:40,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2018-12-03 16:49:40,793 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2018-12-03 16:49:40,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:40,793 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2018-12-03 16:49:40,793 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 16:49:40,793 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2018-12-03 16:49:40,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-12-03 16:49:40,794 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:40,794 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 1, 1, 1, 1, 1] [2018-12-03 16:49:40,794 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:40,794 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:40,794 INFO L82 PathProgramCache]: Analyzing trace with hash 1811736429, now seen corresponding path program 23 times [2018-12-03 16:49:40,794 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:40,795 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:40,795 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:40,795 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:40,795 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:40,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:41,424 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 13 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:41,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:41,424 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:41,424 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:41,425 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:41,425 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:41,425 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:49:41,433 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:49:41,434 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:49:41,464 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-03 16:49:41,465 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:41,468 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:42,116 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 13 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:42,116 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:42,193 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 13 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:42,220 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:42,220 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 46 [2018-12-03 16:49:42,220 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:42,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 16:49:42,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 16:49:42,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=2040, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 16:49:42,221 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand 47 states. [2018-12-03 16:49:45,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:45,828 INFO L93 Difference]: Finished difference Result 214 states and 219 transitions. [2018-12-03 16:49:45,828 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 16:49:45,828 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 100 [2018-12-03 16:49:45,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:45,829 INFO L225 Difference]: With dead ends: 214 [2018-12-03 16:49:45,829 INFO L226 Difference]: Without dead ends: 160 [2018-12-03 16:49:45,830 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 181 SyntacticMatches, 3 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 878 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=445, Invalid=5105, Unknown=0, NotChecked=0, Total=5550 [2018-12-03 16:49:45,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-12-03 16:49:45,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 105. [2018-12-03 16:49:45,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-12-03 16:49:45,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2018-12-03 16:49:45,846 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 100 [2018-12-03 16:49:45,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:45,847 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2018-12-03 16:49:45,847 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 16:49:45,847 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2018-12-03 16:49:45,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-12-03 16:49:45,847 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:45,847 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1] [2018-12-03 16:49:45,847 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:45,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:45,848 INFO L82 PathProgramCache]: Analyzing trace with hash 1008713748, now seen corresponding path program 24 times [2018-12-03 16:49:45,848 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:45,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:45,848 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:45,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:45,849 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:45,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:46,269 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 406 proven. 287 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:46,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:46,269 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:46,269 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:46,269 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:46,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:46,270 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:49:46,278 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:49:46,278 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:49:46,295 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:49:46,295 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:46,297 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:46,721 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 406 proven. 287 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:46,721 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:47,063 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 406 proven. 287 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:47,082 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:47,082 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 46 [2018-12-03 16:49:47,082 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:47,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 16:49:47,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 16:49:47,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 16:49:47,083 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand 47 states. [2018-12-03 16:49:47,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:47,695 INFO L93 Difference]: Finished difference Result 225 states and 229 transitions. [2018-12-03 16:49:47,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-12-03 16:49:47,695 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 104 [2018-12-03 16:49:47,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:47,696 INFO L225 Difference]: With dead ends: 225 [2018-12-03 16:49:47,696 INFO L226 Difference]: Without dead ends: 110 [2018-12-03 16:49:47,697 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 163 SyntacticMatches, 29 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1232 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=916, Invalid=2866, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 16:49:47,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2018-12-03 16:49:47,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 108. [2018-12-03 16:49:47,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-12-03 16:49:47,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions. [2018-12-03 16:49:47,716 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 104 [2018-12-03 16:49:47,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:47,717 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 110 transitions. [2018-12-03 16:49:47,717 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 16:49:47,717 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions. [2018-12-03 16:49:47,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-12-03 16:49:47,717 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:47,718 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1] [2018-12-03 16:49:47,718 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:47,718 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:47,718 INFO L82 PathProgramCache]: Analyzing trace with hash -1699483764, now seen corresponding path program 25 times [2018-12-03 16:49:47,718 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:47,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:47,719 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:47,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:47,719 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:47,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:48,691 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 14 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:48,691 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:48,691 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:48,691 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:48,691 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:48,691 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:48,692 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:49:48,700 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:48,700 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:49:48,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:48,725 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:49,366 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 14 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:49,366 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:49,454 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 14 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:49,472 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:49,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 49 [2018-12-03 16:49:49,473 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:49,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 16:49:49,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 16:49:49,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2320, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 16:49:49,474 INFO L87 Difference]: Start difference. First operand 108 states and 110 transitions. Second operand 50 states. [2018-12-03 16:49:54,112 WARN L180 SmtUtils]: Spent 262.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2018-12-03 16:49:54,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:54,436 INFO L93 Difference]: Finished difference Result 229 states and 234 transitions. [2018-12-03 16:49:54,436 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 16:49:54,437 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 107 [2018-12-03 16:49:54,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:54,437 INFO L225 Difference]: With dead ends: 229 [2018-12-03 16:49:54,437 INFO L226 Difference]: Without dead ends: 171 [2018-12-03 16:49:54,438 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 194 SyntacticMatches, 3 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1000 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=491, Invalid=5829, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 16:49:54,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2018-12-03 16:49:54,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 112. [2018-12-03 16:49:54,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-12-03 16:49:54,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 114 transitions. [2018-12-03 16:49:54,460 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 114 transitions. Word has length 107 [2018-12-03 16:49:54,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:54,460 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 114 transitions. [2018-12-03 16:49:54,460 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 16:49:54,460 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 114 transitions. [2018-12-03 16:49:54,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-12-03 16:49:54,461 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:54,461 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1] [2018-12-03 16:49:54,461 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:54,461 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:54,462 INFO L82 PathProgramCache]: Analyzing trace with hash -1446534989, now seen corresponding path program 26 times [2018-12-03 16:49:54,462 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:54,462 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:54,462 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:49:54,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:54,463 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:54,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:54,926 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 465 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:54,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:54,926 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:54,926 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:54,927 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:54,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:54,927 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:49:54,937 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:49:54,938 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:49:54,967 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-12-03 16:49:54,967 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:54,969 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:55,422 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 465 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:55,422 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:55,725 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 465 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:55,744 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:55,744 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 49 [2018-12-03 16:49:55,744 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:55,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 16:49:55,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 16:49:55,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 16:49:55,745 INFO L87 Difference]: Start difference. First operand 112 states and 114 transitions. Second operand 50 states. [2018-12-03 16:49:56,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:49:56,266 INFO L93 Difference]: Finished difference Result 240 states and 244 transitions. [2018-12-03 16:49:56,266 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-12-03 16:49:56,266 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 111 [2018-12-03 16:49:56,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:49:56,267 INFO L225 Difference]: With dead ends: 240 [2018-12-03 16:49:56,267 INFO L226 Difference]: Without dead ends: 117 [2018-12-03 16:49:56,268 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 174 SyntacticMatches, 31 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1410 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1033, Invalid=3257, Unknown=0, NotChecked=0, Total=4290 [2018-12-03 16:49:56,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-12-03 16:49:56,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2018-12-03 16:49:56,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-12-03 16:49:56,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2018-12-03 16:49:56,289 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 111 [2018-12-03 16:49:56,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:49:56,289 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2018-12-03 16:49:56,289 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 16:49:56,289 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2018-12-03 16:49:56,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-12-03 16:49:56,290 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:49:56,290 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 1, 1, 1, 1, 1] [2018-12-03 16:49:56,290 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:49:56,290 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:49:56,291 INFO L82 PathProgramCache]: Analyzing trace with hash -2055366085, now seen corresponding path program 27 times [2018-12-03 16:49:56,291 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:49:56,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:56,291 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:49:56,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:49:56,292 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:49:56,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:49:57,539 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 15 proven. 826 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:57,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:57,539 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:49:57,540 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:49:57,540 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:49:57,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:49:57,540 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:49:57,548 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:49:57,549 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:49:57,578 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:49:57,578 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:49:57,581 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:49:58,393 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 15 proven. 826 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:58,393 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:49:58,646 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 15 proven. 826 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:49:58,665 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:49:58,665 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 52 [2018-12-03 16:49:58,665 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:49:58,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 16:49:58,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 16:49:58,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2618, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 16:49:58,666 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand 53 states. [2018-12-03 16:50:03,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:03,974 INFO L93 Difference]: Finished difference Result 244 states and 249 transitions. [2018-12-03 16:50:03,980 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 16:50:03,980 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 114 [2018-12-03 16:50:03,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:03,981 INFO L225 Difference]: With dead ends: 244 [2018-12-03 16:50:03,981 INFO L226 Difference]: Without dead ends: 182 [2018-12-03 16:50:03,982 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 207 SyntacticMatches, 3 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1130 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=539, Invalid=6601, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 16:50:03,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-12-03 16:50:04,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 119. [2018-12-03 16:50:04,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-12-03 16:50:04,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2018-12-03 16:50:04,004 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 114 [2018-12-03 16:50:04,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:04,005 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2018-12-03 16:50:04,005 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 16:50:04,005 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2018-12-03 16:50:04,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2018-12-03 16:50:04,006 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:04,006 INFO L402 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1] [2018-12-03 16:50:04,006 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:04,006 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:04,006 INFO L82 PathProgramCache]: Analyzing trace with hash 1833851874, now seen corresponding path program 28 times [2018-12-03 16:50:04,006 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:04,008 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:04,008 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:50:04,008 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:04,008 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:04,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:04,548 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 528 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:04,548 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:04,548 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:04,548 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:04,549 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:04,549 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:04,549 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:50:04,559 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:50:04,560 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:50:04,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:04,580 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:05,076 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 528 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:05,076 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:05,421 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 528 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:05,439 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:05,440 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 52 [2018-12-03 16:50:05,440 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:05,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 16:50:05,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 16:50:05,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 16:50:05,441 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand 53 states. [2018-12-03 16:50:06,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:06,360 INFO L93 Difference]: Finished difference Result 255 states and 259 transitions. [2018-12-03 16:50:06,360 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-12-03 16:50:06,360 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 118 [2018-12-03 16:50:06,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:06,361 INFO L225 Difference]: With dead ends: 255 [2018-12-03 16:50:06,362 INFO L226 Difference]: Without dead ends: 124 [2018-12-03 16:50:06,363 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 185 SyntacticMatches, 33 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1600 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1157, Invalid=3673, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 16:50:06,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-03 16:50:06,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 122. [2018-12-03 16:50:06,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-12-03 16:50:06,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 124 transitions. [2018-12-03 16:50:06,382 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 124 transitions. Word has length 118 [2018-12-03 16:50:06,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:06,383 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 124 transitions. [2018-12-03 16:50:06,383 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 16:50:06,383 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 124 transitions. [2018-12-03 16:50:06,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-12-03 16:50:06,383 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:06,383 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1] [2018-12-03 16:50:06,384 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:06,384 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:06,384 INFO L82 PathProgramCache]: Analyzing trace with hash 540940634, now seen corresponding path program 29 times [2018-12-03 16:50:06,384 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:06,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:06,385 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:50:06,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:06,385 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:06,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:07,301 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 16 proven. 937 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:07,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:07,302 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:07,302 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:07,302 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:07,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:07,302 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:50:07,311 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:50:07,311 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:50:07,356 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-03 16:50:07,356 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:50:07,358 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:09,600 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 512 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:09,600 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:11,357 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 496 proven. 457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:11,375 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:11,376 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 38, 38] total 93 [2018-12-03 16:50:11,376 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:11,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-12-03 16:50:11,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-12-03 16:50:11,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=995, Invalid=7747, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 16:50:11,377 INFO L87 Difference]: Start difference. First operand 122 states and 124 transitions. Second operand 75 states. [2018-12-03 16:50:21,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:21,993 INFO L93 Difference]: Finished difference Result 325 states and 331 transitions. [2018-12-03 16:50:21,993 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-12-03 16:50:21,994 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 121 [2018-12-03 16:50:21,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:21,995 INFO L225 Difference]: With dead ends: 325 [2018-12-03 16:50:21,996 INFO L226 Difference]: Without dead ends: 190 [2018-12-03 16:50:21,998 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 167 SyntacticMatches, 18 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8265 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=3055, Invalid=35165, Unknown=0, NotChecked=0, Total=38220 [2018-12-03 16:50:21,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-12-03 16:50:22,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 129. [2018-12-03 16:50:22,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-12-03 16:50:22,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 131 transitions. [2018-12-03 16:50:22,019 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 131 transitions. Word has length 121 [2018-12-03 16:50:22,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:22,019 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 131 transitions. [2018-12-03 16:50:22,019 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-12-03 16:50:22,020 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 131 transitions. [2018-12-03 16:50:22,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-12-03 16:50:22,020 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:22,020 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 1, 1, 1, 1, 1] [2018-12-03 16:50:22,021 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:22,021 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:22,021 INFO L82 PathProgramCache]: Analyzing trace with hash -1991581943, now seen corresponding path program 30 times [2018-12-03 16:50:22,021 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:22,022 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:22,022 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:50:22,022 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:22,022 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:22,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:23,058 INFO L134 CoverageAnalysis]: Checked inductivity of 1072 backedges. 17 proven. 1055 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:23,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:23,059 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:23,059 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:23,059 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:23,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:23,059 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:50:23,067 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:50:23,067 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:50:23,087 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:50:23,087 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:50:23,090 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:23,995 INFO L134 CoverageAnalysis]: Checked inductivity of 1072 backedges. 17 proven. 1055 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:23,995 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:24,282 INFO L134 CoverageAnalysis]: Checked inductivity of 1072 backedges. 17 proven. 1055 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:24,301 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:24,302 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 58 [2018-12-03 16:50:24,302 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:24,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 16:50:24,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 16:50:24,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=3268, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 16:50:24,303 INFO L87 Difference]: Start difference. First operand 129 states and 131 transitions. Second operand 59 states. [2018-12-03 16:50:29,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:29,896 INFO L93 Difference]: Finished difference Result 274 states and 279 transitions. [2018-12-03 16:50:29,896 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 16:50:29,896 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 128 [2018-12-03 16:50:29,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:29,898 INFO L225 Difference]: With dead ends: 274 [2018-12-03 16:50:29,898 INFO L226 Difference]: Without dead ends: 204 [2018-12-03 16:50:29,899 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 233 SyntacticMatches, 3 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1414 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=641, Invalid=8289, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 16:50:29,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-12-03 16:50:29,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 133. [2018-12-03 16:50:29,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-12-03 16:50:29,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2018-12-03 16:50:29,921 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 128 [2018-12-03 16:50:29,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:29,921 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2018-12-03 16:50:29,921 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 16:50:29,921 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2018-12-03 16:50:29,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-12-03 16:50:29,922 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:29,922 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1] [2018-12-03 16:50:29,922 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:29,922 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:29,922 INFO L82 PathProgramCache]: Analyzing trace with hash -1942976080, now seen corresponding path program 31 times [2018-12-03 16:50:29,923 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:29,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:29,923 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:50:29,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:29,923 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:29,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:31,316 INFO L134 CoverageAnalysis]: Checked inductivity of 1143 backedges. 666 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:31,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:31,317 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:31,317 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:31,317 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:31,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:31,317 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:50:31,333 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:50:31,334 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:50:31,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:31,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:31,995 INFO L134 CoverageAnalysis]: Checked inductivity of 1143 backedges. 666 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:31,995 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:32,430 INFO L134 CoverageAnalysis]: Checked inductivity of 1143 backedges. 666 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:32,448 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:32,449 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 58 [2018-12-03 16:50:32,449 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:32,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 16:50:32,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 16:50:32,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 16:50:32,450 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand 59 states. [2018-12-03 16:50:33,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:33,336 INFO L93 Difference]: Finished difference Result 285 states and 289 transitions. [2018-12-03 16:50:33,336 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-12-03 16:50:33,336 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 132 [2018-12-03 16:50:33,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:33,338 INFO L225 Difference]: With dead ends: 285 [2018-12-03 16:50:33,338 INFO L226 Difference]: Without dead ends: 138 [2018-12-03 16:50:33,339 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 207 SyntacticMatches, 37 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2016 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1426, Invalid=4580, Unknown=0, NotChecked=0, Total=6006 [2018-12-03 16:50:33,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-12-03 16:50:33,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2018-12-03 16:50:33,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-12-03 16:50:33,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 138 transitions. [2018-12-03 16:50:33,365 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 138 transitions. Word has length 132 [2018-12-03 16:50:33,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:33,366 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 138 transitions. [2018-12-03 16:50:33,366 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 16:50:33,366 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 138 transitions. [2018-12-03 16:50:33,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-12-03 16:50:33,366 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:33,366 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1] [2018-12-03 16:50:33,367 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:33,367 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:33,367 INFO L82 PathProgramCache]: Analyzing trace with hash 220943656, now seen corresponding path program 32 times [2018-12-03 16:50:33,367 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:33,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:33,368 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:50:33,368 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:33,368 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:33,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:34,893 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 18 proven. 1180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:34,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:34,894 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:34,894 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:34,894 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:34,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:34,894 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:50:34,903 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:50:34,903 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:50:34,943 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-12-03 16:50:34,943 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:50:34,946 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:37,363 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 648 proven. 550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:37,364 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:39,817 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 630 proven. 568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:39,836 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:39,836 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 42, 42] total 103 [2018-12-03 16:50:39,836 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:39,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 16:50:39,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 16:50:39,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1204, Invalid=9508, Unknown=0, NotChecked=0, Total=10712 [2018-12-03 16:50:39,837 INFO L87 Difference]: Start difference. First operand 136 states and 138 transitions. Second operand 83 states. [2018-12-03 16:50:50,690 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2018-12-03 16:50:50,978 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2018-12-03 16:50:53,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:50:53,527 INFO L93 Difference]: Finished difference Result 363 states and 369 transitions. [2018-12-03 16:50:53,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2018-12-03 16:50:53,528 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 135 [2018-12-03 16:50:53,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:50:53,530 INFO L225 Difference]: With dead ends: 363 [2018-12-03 16:50:53,530 INFO L226 Difference]: Without dead ends: 212 [2018-12-03 16:50:53,532 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 187 SyntacticMatches, 20 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10242 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=3677, Invalid=43629, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 16:50:53,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2018-12-03 16:50:53,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 143. [2018-12-03 16:50:53,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2018-12-03 16:50:53,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2018-12-03 16:50:53,555 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 135 [2018-12-03 16:50:53,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:50:53,555 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2018-12-03 16:50:53,555 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 16:50:53,555 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2018-12-03 16:50:53,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2018-12-03 16:50:53,555 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:50:53,556 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 1, 1, 1, 1, 1] [2018-12-03 16:50:53,556 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:50:53,556 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:50:53,556 INFO L82 PathProgramCache]: Analyzing trace with hash 847427031, now seen corresponding path program 33 times [2018-12-03 16:50:53,556 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:50:53,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:53,557 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:50:53,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:50:53,557 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:50:53,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:50:55,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1331 backedges. 19 proven. 1312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:55,250 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:55,250 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:50:55,250 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:50:55,250 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:50:55,250 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:50:55,250 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:50:55,258 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:50:55,258 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:50:55,294 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:50:55,294 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:50:55,298 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:50:56,384 INFO L134 CoverageAnalysis]: Checked inductivity of 1331 backedges. 19 proven. 1312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:56,385 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:50:56,503 INFO L134 CoverageAnalysis]: Checked inductivity of 1331 backedges. 19 proven. 1312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:50:56,522 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:50:56,522 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 64 [2018-12-03 16:50:56,522 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:50:56,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 16:50:56,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 16:50:56,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3990, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 16:50:56,523 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand 65 states. [2018-12-03 16:51:00,921 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2018-12-03 16:51:01,206 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2018-12-03 16:51:01,468 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2018-12-03 16:51:03,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:51:03,327 INFO L93 Difference]: Finished difference Result 304 states and 309 transitions. [2018-12-03 16:51:03,327 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 16:51:03,327 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 142 [2018-12-03 16:51:03,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:51:03,328 INFO L225 Difference]: With dead ends: 304 [2018-12-03 16:51:03,329 INFO L226 Difference]: Without dead ends: 226 [2018-12-03 16:51:03,329 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 259 SyntacticMatches, 3 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1730 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=751, Invalid=10169, Unknown=0, NotChecked=0, Total=10920 [2018-12-03 16:51:03,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2018-12-03 16:51:03,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 147. [2018-12-03 16:51:03,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-12-03 16:51:03,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 149 transitions. [2018-12-03 16:51:03,357 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 149 transitions. Word has length 142 [2018-12-03 16:51:03,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:51:03,358 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 149 transitions. [2018-12-03 16:51:03,358 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 16:51:03,358 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 149 transitions. [2018-12-03 16:51:03,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-12-03 16:51:03,359 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:51:03,359 INFO L402 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1] [2018-12-03 16:51:03,359 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:51:03,359 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:51:03,359 INFO L82 PathProgramCache]: Analyzing trace with hash -1796978306, now seen corresponding path program 34 times [2018-12-03 16:51:03,359 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:51:03,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:03,360 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:51:03,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:03,360 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:51:03,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:04,033 INFO L134 CoverageAnalysis]: Checked inductivity of 1410 backedges. 820 proven. 590 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:04,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:04,033 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:04,033 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:04,034 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:04,034 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:04,034 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:51:04,045 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:51:04,045 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:51:04,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:04,082 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:04,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1410 backedges. 820 proven. 590 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:04,886 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:51:05,758 INFO L134 CoverageAnalysis]: Checked inductivity of 1410 backedges. 820 proven. 590 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:05,776 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:51:05,777 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 64 [2018-12-03 16:51:05,777 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:51:05,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 16:51:05,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 16:51:05,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 16:51:05,778 INFO L87 Difference]: Start difference. First operand 147 states and 149 transitions. Second operand 65 states. [2018-12-03 16:51:07,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:51:07,124 INFO L93 Difference]: Finished difference Result 315 states and 319 transitions. [2018-12-03 16:51:07,124 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-03 16:51:07,124 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 146 [2018-12-03 16:51:07,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:51:07,125 INFO L225 Difference]: With dead ends: 315 [2018-12-03 16:51:07,126 INFO L226 Difference]: Without dead ends: 152 [2018-12-03 16:51:07,126 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 229 SyntacticMatches, 41 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2480 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1723, Invalid=5587, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 16:51:07,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-12-03 16:51:07,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 150. [2018-12-03 16:51:07,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-12-03 16:51:07,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 152 transitions. [2018-12-03 16:51:07,156 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 152 transitions. Word has length 146 [2018-12-03 16:51:07,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:51:07,157 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 152 transitions. [2018-12-03 16:51:07,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 16:51:07,157 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 152 transitions. [2018-12-03 16:51:07,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-12-03 16:51:07,157 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:51:07,157 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1] [2018-12-03 16:51:07,157 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:51:07,158 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:51:07,158 INFO L82 PathProgramCache]: Analyzing trace with hash -193355018, now seen corresponding path program 35 times [2018-12-03 16:51:07,158 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:51:07,158 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:07,158 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:51:07,159 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:07,159 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:51:07,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:08,354 INFO L134 CoverageAnalysis]: Checked inductivity of 1471 backedges. 20 proven. 1451 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:08,354 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:08,354 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:08,355 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:08,355 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:08,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:08,355 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:51:08,363 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:51:08,363 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:51:08,560 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-12-03 16:51:08,560 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:51:08,563 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:11,660 INFO L134 CoverageAnalysis]: Checked inductivity of 1471 backedges. 800 proven. 671 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:11,660 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:51:14,252 INFO L134 CoverageAnalysis]: Checked inductivity of 1471 backedges. 780 proven. 691 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:14,270 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:51:14,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 46, 46] total 113 [2018-12-03 16:51:14,271 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:51:14,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2018-12-03 16:51:14,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2018-12-03 16:51:14,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=11449, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 16:51:14,272 INFO L87 Difference]: Start difference. First operand 150 states and 152 transitions. Second operand 91 states. [2018-12-03 16:51:26,159 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2018-12-03 16:51:26,468 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2018-12-03 16:51:26,782 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2018-12-03 16:51:27,057 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 16:51:27,355 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-03 16:51:27,629 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2018-12-03 16:51:29,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:51:29,902 INFO L93 Difference]: Finished difference Result 401 states and 407 transitions. [2018-12-03 16:51:29,903 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2018-12-03 16:51:29,903 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 149 [2018-12-03 16:51:29,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:51:29,904 INFO L225 Difference]: With dead ends: 401 [2018-12-03 16:51:29,904 INFO L226 Difference]: Without dead ends: 234 [2018-12-03 16:51:29,905 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 207 SyntacticMatches, 22 SemanticMatches, 238 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12431 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=4355, Invalid=53005, Unknown=0, NotChecked=0, Total=57360 [2018-12-03 16:51:29,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2018-12-03 16:51:29,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 157. [2018-12-03 16:51:29,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-12-03 16:51:29,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2018-12-03 16:51:29,944 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 149 [2018-12-03 16:51:29,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:51:29,944 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2018-12-03 16:51:29,944 INFO L481 AbstractCegarLoop]: Interpolant automaton has 91 states. [2018-12-03 16:51:29,944 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2018-12-03 16:51:29,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-12-03 16:51:29,945 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:51:29,945 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 1, 1, 1, 1, 1] [2018-12-03 16:51:29,946 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:51:29,946 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:51:29,946 INFO L82 PathProgramCache]: Analyzing trace with hash 1380130469, now seen corresponding path program 36 times [2018-12-03 16:51:29,946 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:51:29,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:29,947 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:51:29,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:29,947 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:51:29,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:31,957 INFO L134 CoverageAnalysis]: Checked inductivity of 1618 backedges. 21 proven. 1597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:31,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:31,958 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:31,958 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:31,958 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:31,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:31,958 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:51:31,966 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:51:31,967 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:51:31,993 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:51:31,994 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:51:31,997 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:34,723 INFO L134 CoverageAnalysis]: Checked inductivity of 1618 backedges. 21 proven. 1597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:34,724 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:51:34,860 INFO L134 CoverageAnalysis]: Checked inductivity of 1618 backedges. 21 proven. 1597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:34,878 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:51:34,878 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 70 [2018-12-03 16:51:34,878 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:51:34,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 16:51:34,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 16:51:34,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=4784, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 16:51:34,879 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand 71 states. [2018-12-03 16:51:40,664 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2018-12-03 16:51:41,038 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2018-12-03 16:51:41,385 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2018-12-03 16:51:41,585 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 16:51:41,777 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 16:51:43,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:51:43,787 INFO L93 Difference]: Finished difference Result 334 states and 339 transitions. [2018-12-03 16:51:43,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 16:51:43,787 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 156 [2018-12-03 16:51:43,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:51:43,789 INFO L225 Difference]: With dead ends: 334 [2018-12-03 16:51:43,789 INFO L226 Difference]: Without dead ends: 248 [2018-12-03 16:51:43,790 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 285 SyntacticMatches, 3 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2078 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=869, Invalid=12241, Unknown=0, NotChecked=0, Total=13110 [2018-12-03 16:51:43,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2018-12-03 16:51:43,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 161. [2018-12-03 16:51:43,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2018-12-03 16:51:43,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 163 transitions. [2018-12-03 16:51:43,831 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 163 transitions. Word has length 156 [2018-12-03 16:51:43,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:51:43,832 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 163 transitions. [2018-12-03 16:51:43,832 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 16:51:43,832 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 163 transitions. [2018-12-03 16:51:43,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2018-12-03 16:51:43,833 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:51:43,833 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1] [2018-12-03 16:51:43,833 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:51:43,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:51:43,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1719166132, now seen corresponding path program 37 times [2018-12-03 16:51:43,834 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:51:43,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:43,834 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:51:43,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:43,835 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:51:43,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:45,145 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 990 proven. 715 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:45,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:45,145 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:45,145 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:45,145 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:45,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:45,146 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:51:45,154 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:51:45,154 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:51:45,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:45,187 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:46,396 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 990 proven. 715 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:46,396 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:51:47,066 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 990 proven. 715 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:47,084 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:51:47,085 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 70 [2018-12-03 16:51:47,085 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:51:47,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 16:51:47,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 16:51:47,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 16:51:47,086 INFO L87 Difference]: Start difference. First operand 161 states and 163 transitions. Second operand 71 states. [2018-12-03 16:51:48,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:51:48,667 INFO L93 Difference]: Finished difference Result 345 states and 349 transitions. [2018-12-03 16:51:48,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-12-03 16:51:48,668 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 160 [2018-12-03 16:51:48,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:51:48,669 INFO L225 Difference]: With dead ends: 345 [2018-12-03 16:51:48,669 INFO L226 Difference]: Without dead ends: 166 [2018-12-03 16:51:48,670 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 251 SyntacticMatches, 45 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2992 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2048, Invalid=6694, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 16:51:48,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-12-03 16:51:48,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 164. [2018-12-03 16:51:48,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-12-03 16:51:48,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 166 transitions. [2018-12-03 16:51:48,699 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 166 transitions. Word has length 160 [2018-12-03 16:51:48,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:51:48,699 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 166 transitions. [2018-12-03 16:51:48,699 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 16:51:48,699 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 166 transitions. [2018-12-03 16:51:48,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-12-03 16:51:48,700 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:51:48,700 INFO L402 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1] [2018-12-03 16:51:48,700 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:51:48,700 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:51:48,700 INFO L82 PathProgramCache]: Analyzing trace with hash -148438332, now seen corresponding path program 38 times [2018-12-03 16:51:48,701 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:51:48,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:48,701 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:51:48,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:51:48,702 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:51:48,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:51:50,292 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 22 proven. 1750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:50,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:50,292 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:51:50,292 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:51:50,292 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:51:50,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:51:50,292 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:51:50,301 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:51:50,302 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:51:50,344 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 16:51:50,345 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:51:50,348 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:51:51,959 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 22 proven. 1750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:51,959 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:51:52,112 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 22 proven. 1750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:51:52,130 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:51:52,131 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48, 48] total 73 [2018-12-03 16:51:52,131 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:51:52,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-03 16:51:52,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-03 16:51:52,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=5208, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 16:51:52,132 INFO L87 Difference]: Start difference. First operand 164 states and 166 transitions. Second operand 74 states. [2018-12-03 16:51:59,185 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2018-12-03 16:51:59,520 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2018-12-03 16:51:59,836 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2018-12-03 16:52:00,047 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 16:52:00,254 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 16:52:00,452 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 16:52:02,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:02,601 INFO L93 Difference]: Finished difference Result 349 states and 354 transitions. [2018-12-03 16:52:02,601 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 16:52:02,602 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 163 [2018-12-03 16:52:02,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:02,603 INFO L225 Difference]: With dead ends: 349 [2018-12-03 16:52:02,604 INFO L226 Difference]: Without dead ends: 259 [2018-12-03 16:52:02,605 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 298 SyntacticMatches, 3 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2264 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=931, Invalid=13349, Unknown=0, NotChecked=0, Total=14280 [2018-12-03 16:52:02,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2018-12-03 16:52:02,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 168. [2018-12-03 16:52:02,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-12-03 16:52:02,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 170 transitions. [2018-12-03 16:52:02,637 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 170 transitions. Word has length 163 [2018-12-03 16:52:02,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:02,637 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 170 transitions. [2018-12-03 16:52:02,637 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-03 16:52:02,637 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 170 transitions. [2018-12-03 16:52:02,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-12-03 16:52:02,638 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:02,638 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1] [2018-12-03 16:52:02,638 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:02,638 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:02,638 INFO L82 PathProgramCache]: Analyzing trace with hash -1550952469, now seen corresponding path program 39 times [2018-12-03 16:52:02,638 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:02,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:02,639 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:52:02,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:02,639 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:02,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:03,505 INFO L134 CoverageAnalysis]: Checked inductivity of 1863 backedges. 1081 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:03,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:03,505 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:52:03,506 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:52:03,506 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:52:03,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:03,506 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:52:03,514 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:52:03,514 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:52:03,539 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:52:03,539 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:52:03,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:52:04,503 INFO L134 CoverageAnalysis]: Checked inductivity of 1863 backedges. 1081 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:04,503 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:05,190 INFO L134 CoverageAnalysis]: Checked inductivity of 1863 backedges. 1081 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:05,221 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:05,221 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 73 [2018-12-03 16:52:05,221 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:05,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-03 16:52:05,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-03 16:52:05,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 16:52:05,223 INFO L87 Difference]: Start difference. First operand 168 states and 170 transitions. Second operand 74 states. [2018-12-03 16:52:07,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:07,153 INFO L93 Difference]: Finished difference Result 360 states and 364 transitions. [2018-12-03 16:52:07,153 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-12-03 16:52:07,153 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 167 [2018-12-03 16:52:07,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:07,155 INFO L225 Difference]: With dead ends: 360 [2018-12-03 16:52:07,155 INFO L226 Difference]: Without dead ends: 173 [2018-12-03 16:52:07,156 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 262 SyntacticMatches, 47 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3266 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=2221, Invalid=7285, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 16:52:07,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2018-12-03 16:52:07,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 171. [2018-12-03 16:52:07,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-12-03 16:52:07,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 173 transitions. [2018-12-03 16:52:07,187 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 173 transitions. Word has length 167 [2018-12-03 16:52:07,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:07,187 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 173 transitions. [2018-12-03 16:52:07,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-03 16:52:07,187 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 173 transitions. [2018-12-03 16:52:07,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-12-03 16:52:07,188 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:07,188 INFO L402 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 1, 1, 1, 1, 1] [2018-12-03 16:52:07,188 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:07,189 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:07,189 INFO L82 PathProgramCache]: Analyzing trace with hash -810935949, now seen corresponding path program 40 times [2018-12-03 16:52:07,189 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:07,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:07,189 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:52:07,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:07,189 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:07,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:09,019 INFO L134 CoverageAnalysis]: Checked inductivity of 1933 backedges. 23 proven. 1910 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:09,019 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:09,019 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:52:09,019 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:52:09,020 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:52:09,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:09,020 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:52:09,030 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:52:09,030 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:52:09,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:09,066 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:52:10,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1933 backedges. 23 proven. 1910 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:10,754 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:10,912 INFO L134 CoverageAnalysis]: Checked inductivity of 1933 backedges. 23 proven. 1910 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:10,931 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:10,931 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 76 [2018-12-03 16:52:10,931 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:10,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 16:52:10,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 16:52:10,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=5650, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 16:52:10,933 INFO L87 Difference]: Start difference. First operand 171 states and 173 transitions. Second operand 77 states. [2018-12-03 16:52:18,658 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 123 [2018-12-03 16:52:19,011 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 123 [2018-12-03 16:52:19,355 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2018-12-03 16:52:19,587 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 16:52:19,810 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 16:52:20,024 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 16:52:20,222 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 16:52:22,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:22,545 INFO L93 Difference]: Finished difference Result 364 states and 369 transitions. [2018-12-03 16:52:22,545 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 16:52:22,545 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 170 [2018-12-03 16:52:22,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:22,547 INFO L225 Difference]: With dead ends: 364 [2018-12-03 16:52:22,547 INFO L226 Difference]: Without dead ends: 270 [2018-12-03 16:52:22,547 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 311 SyntacticMatches, 3 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2458 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=995, Invalid=14505, Unknown=0, NotChecked=0, Total=15500 [2018-12-03 16:52:22,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2018-12-03 16:52:22,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 175. [2018-12-03 16:52:22,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-12-03 16:52:22,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 177 transitions. [2018-12-03 16:52:22,580 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 177 transitions. Word has length 170 [2018-12-03 16:52:22,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:22,581 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 177 transitions. [2018-12-03 16:52:22,581 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 16:52:22,581 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 177 transitions. [2018-12-03 16:52:22,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-12-03 16:52:22,581 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:22,581 INFO L402 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1] [2018-12-03 16:52:22,582 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:22,582 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:22,582 INFO L82 PathProgramCache]: Analyzing trace with hash -1036484838, now seen corresponding path program 41 times [2018-12-03 16:52:22,582 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:22,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:22,583 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:52:22,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:22,583 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:22,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:23,600 INFO L134 CoverageAnalysis]: Checked inductivity of 2028 backedges. 1176 proven. 852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:23,600 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:23,600 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:52:23,601 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:52:23,601 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:52:23,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:23,601 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:52:23,622 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:52:23,622 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:52:23,719 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-12-03 16:52:23,719 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:52:23,722 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:52:24,991 INFO L134 CoverageAnalysis]: Checked inductivity of 2028 backedges. 1176 proven. 852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:24,991 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:25,770 INFO L134 CoverageAnalysis]: Checked inductivity of 2028 backedges. 1176 proven. 852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:25,789 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:25,790 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 76 [2018-12-03 16:52:25,790 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:25,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 16:52:25,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 16:52:25,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 16:52:25,791 INFO L87 Difference]: Start difference. First operand 175 states and 177 transitions. Second operand 77 states. [2018-12-03 16:52:27,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:27,807 INFO L93 Difference]: Finished difference Result 375 states and 379 transitions. [2018-12-03 16:52:27,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-12-03 16:52:27,808 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 174 [2018-12-03 16:52:27,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:27,809 INFO L225 Difference]: With dead ends: 375 [2018-12-03 16:52:27,809 INFO L226 Difference]: Without dead ends: 180 [2018-12-03 16:52:27,810 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 273 SyntacticMatches, 49 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3552 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2401, Invalid=7901, Unknown=0, NotChecked=0, Total=10302 [2018-12-03 16:52:27,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-12-03 16:52:27,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 178. [2018-12-03 16:52:27,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-12-03 16:52:27,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 180 transitions. [2018-12-03 16:52:27,844 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 180 transitions. Word has length 174 [2018-12-03 16:52:27,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:27,844 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 180 transitions. [2018-12-03 16:52:27,844 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 16:52:27,844 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 180 transitions. [2018-12-03 16:52:27,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-12-03 16:52:27,845 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:27,845 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1] [2018-12-03 16:52:27,845 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:27,845 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:27,845 INFO L82 PathProgramCache]: Analyzing trace with hash -1003391854, now seen corresponding path program 42 times [2018-12-03 16:52:27,845 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:27,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:27,846 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:52:27,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:27,846 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:27,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:30,057 INFO L134 CoverageAnalysis]: Checked inductivity of 2101 backedges. 24 proven. 2077 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:30,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:30,057 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:52:30,057 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:52:30,057 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:52:30,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:30,058 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:52:30,065 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:52:30,066 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:52:30,094 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:52:30,095 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:52:30,098 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:52:31,765 INFO L134 CoverageAnalysis]: Checked inductivity of 2101 backedges. 24 proven. 2077 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:31,765 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:31,930 INFO L134 CoverageAnalysis]: Checked inductivity of 2101 backedges. 24 proven. 2077 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:31,949 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:31,949 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52, 52] total 79 [2018-12-03 16:52:31,949 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:31,949 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-12-03 16:52:31,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-12-03 16:52:31,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=6110, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 16:52:31,950 INFO L87 Difference]: Start difference. First operand 178 states and 180 transitions. Second operand 80 states. [2018-12-03 16:52:38,616 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2018-12-03 16:52:38,989 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2018-12-03 16:52:39,349 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 123 [2018-12-03 16:52:39,590 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 16:52:39,836 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 16:52:40,053 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 16:52:40,270 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 16:52:40,482 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 16:52:42,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:42,834 INFO L93 Difference]: Finished difference Result 379 states and 384 transitions. [2018-12-03 16:52:42,834 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2018-12-03 16:52:42,834 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 177 [2018-12-03 16:52:42,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:42,835 INFO L225 Difference]: With dead ends: 379 [2018-12-03 16:52:42,835 INFO L226 Difference]: Without dead ends: 281 [2018-12-03 16:52:42,837 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 324 SyntacticMatches, 3 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2660 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=1061, Invalid=15709, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 16:52:42,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2018-12-03 16:52:42,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 182. [2018-12-03 16:52:42,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-12-03 16:52:42,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 184 transitions. [2018-12-03 16:52:42,883 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 184 transitions. Word has length 177 [2018-12-03 16:52:42,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:42,884 INFO L480 AbstractCegarLoop]: Abstraction has 182 states and 184 transitions. [2018-12-03 16:52:42,884 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-12-03 16:52:42,884 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 184 transitions. [2018-12-03 16:52:42,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2018-12-03 16:52:42,885 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:42,885 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1] [2018-12-03 16:52:42,885 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:42,885 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:42,886 INFO L82 PathProgramCache]: Analyzing trace with hash 525284025, now seen corresponding path program 43 times [2018-12-03 16:52:42,886 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:42,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:42,886 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:52:42,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:42,887 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:42,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:43,830 INFO L134 CoverageAnalysis]: Checked inductivity of 2200 backedges. 1275 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:43,830 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:43,830 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:52:43,830 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:52:43,831 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:52:43,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:43,831 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:52:43,842 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:52:43,842 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:52:43,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:43,880 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:52:44,958 INFO L134 CoverageAnalysis]: Checked inductivity of 2200 backedges. 1275 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:44,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:45,752 INFO L134 CoverageAnalysis]: Checked inductivity of 2200 backedges. 1275 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:45,770 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:45,771 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 79 [2018-12-03 16:52:45,771 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:45,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-12-03 16:52:45,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-12-03 16:52:45,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 16:52:45,772 INFO L87 Difference]: Start difference. First operand 182 states and 184 transitions. Second operand 80 states. [2018-12-03 16:52:47,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:52:47,913 INFO L93 Difference]: Finished difference Result 390 states and 394 transitions. [2018-12-03 16:52:47,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-03 16:52:47,913 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 181 [2018-12-03 16:52:47,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:52:47,914 INFO L225 Difference]: With dead ends: 390 [2018-12-03 16:52:47,914 INFO L226 Difference]: Without dead ends: 187 [2018-12-03 16:52:47,915 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 439 GetRequests, 284 SyntacticMatches, 51 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3850 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2588, Invalid=8542, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 16:52:47,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-12-03 16:52:47,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 185. [2018-12-03 16:52:47,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 185 states. [2018-12-03 16:52:47,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 187 transitions. [2018-12-03 16:52:47,952 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 187 transitions. Word has length 181 [2018-12-03 16:52:47,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:52:47,952 INFO L480 AbstractCegarLoop]: Abstraction has 185 states and 187 transitions. [2018-12-03 16:52:47,952 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-12-03 16:52:47,953 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 187 transitions. [2018-12-03 16:52:47,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2018-12-03 16:52:47,953 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:52:47,953 INFO L402 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 25, 1, 1, 1, 1, 1] [2018-12-03 16:52:47,953 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:52:47,954 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:52:47,954 INFO L82 PathProgramCache]: Analyzing trace with hash -1479170495, now seen corresponding path program 44 times [2018-12-03 16:52:47,954 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:52:47,954 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:47,954 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:52:47,954 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:52:47,955 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:52:47,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:52:50,410 INFO L134 CoverageAnalysis]: Checked inductivity of 2276 backedges. 25 proven. 2251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:50,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:50,410 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:52:50,410 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:52:50,410 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:52:50,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:52:50,410 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:52:50,419 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:52:50,419 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:52:50,469 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-12-03 16:52:50,469 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:52:50,472 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:52:54,911 INFO L134 CoverageAnalysis]: Checked inductivity of 2276 backedges. 1250 proven. 1026 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:54,912 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:52:59,136 INFO L134 CoverageAnalysis]: Checked inductivity of 2276 backedges. 1225 proven. 1051 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:52:59,155 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:52:59,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 56, 56] total 138 [2018-12-03 16:52:59,155 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:52:59,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 111 states [2018-12-03 16:52:59,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2018-12-03 16:52:59,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2093, Invalid=17089, Unknown=0, NotChecked=0, Total=19182 [2018-12-03 16:52:59,157 INFO L87 Difference]: Start difference. First operand 185 states and 187 transitions. Second operand 111 states. [2018-12-03 16:53:16,967 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2018-12-03 16:53:17,418 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2018-12-03 16:53:17,895 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2018-12-03 16:53:18,355 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 16:53:18,732 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 16:53:19,093 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 16:53:19,435 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 16:53:19,769 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 16:53:20,094 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 16:53:23,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:53:23,278 INFO L93 Difference]: Finished difference Result 496 states and 502 transitions. [2018-12-03 16:53:23,279 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 184 states. [2018-12-03 16:53:23,279 INFO L78 Accepts]: Start accepts. Automaton has 111 states. Word has length 184 [2018-12-03 16:53:23,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:53:23,280 INFO L225 Difference]: With dead ends: 496 [2018-12-03 16:53:23,281 INFO L226 Difference]: Without dead ends: 289 [2018-12-03 16:53:23,284 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 577 GetRequests, 257 SyntacticMatches, 27 SemanticMatches, 293 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18831 ImplicationChecksByTransitivity, 28.5s TimeCoverageRelationStatistics Valid=6295, Invalid=80435, Unknown=0, NotChecked=0, Total=86730 [2018-12-03 16:53:23,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2018-12-03 16:53:23,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 192. [2018-12-03 16:53:23,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-12-03 16:53:23,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 194 transitions. [2018-12-03 16:53:23,323 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 194 transitions. Word has length 184 [2018-12-03 16:53:23,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:53:23,323 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 194 transitions. [2018-12-03 16:53:23,323 INFO L481 AbstractCegarLoop]: Interpolant automaton has 111 states. [2018-12-03 16:53:23,323 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 194 transitions. [2018-12-03 16:53:23,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-12-03 16:53:23,324 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:53:23,324 INFO L402 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 26, 26, 26, 1, 1, 1, 1, 1] [2018-12-03 16:53:23,325 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:53:23,325 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:53:23,325 INFO L82 PathProgramCache]: Analyzing trace with hash -1734936480, now seen corresponding path program 45 times [2018-12-03 16:53:23,325 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:53:23,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:23,326 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:53:23,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:23,326 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:53:23,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:25,352 INFO L134 CoverageAnalysis]: Checked inductivity of 2458 backedges. 26 proven. 2432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:25,352 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:25,352 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:53:25,352 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:53:25,352 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:53:25,352 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:25,352 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:53:25,361 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:53:25,361 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:53:25,390 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:53:25,390 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:53:25,393 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:53:27,248 INFO L134 CoverageAnalysis]: Checked inductivity of 2458 backedges. 26 proven. 2432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:27,248 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:53:27,539 INFO L134 CoverageAnalysis]: Checked inductivity of 2458 backedges. 26 proven. 2432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:27,558 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:53:27,558 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56, 56] total 85 [2018-12-03 16:53:27,558 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:53:27,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-03 16:53:27,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-03 16:53:27,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=7084, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 16:53:27,559 INFO L87 Difference]: Start difference. First operand 192 states and 194 transitions. Second operand 86 states. [2018-12-03 16:53:36,172 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-12-03 16:53:36,617 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-12-03 16:53:37,029 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2018-12-03 16:53:37,306 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 16:53:37,574 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 16:53:37,835 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 16:53:38,087 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 16:53:38,332 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 16:53:38,576 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 16:53:38,842 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 16:53:41,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:53:41,220 INFO L93 Difference]: Finished difference Result 409 states and 414 transitions. [2018-12-03 16:53:41,220 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-12-03 16:53:41,220 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 191 [2018-12-03 16:53:41,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:53:41,222 INFO L225 Difference]: With dead ends: 409 [2018-12-03 16:53:41,222 INFO L226 Difference]: Without dead ends: 303 [2018-12-03 16:53:41,223 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 350 SyntacticMatches, 3 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3088 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=1199, Invalid=18261, Unknown=0, NotChecked=0, Total=19460 [2018-12-03 16:53:41,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2018-12-03 16:53:41,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 196. [2018-12-03 16:53:41,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-12-03 16:53:41,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 198 transitions. [2018-12-03 16:53:41,263 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 198 transitions. Word has length 191 [2018-12-03 16:53:41,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:53:41,263 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 198 transitions. [2018-12-03 16:53:41,264 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-03 16:53:41,264 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 198 transitions. [2018-12-03 16:53:41,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-12-03 16:53:41,264 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:53:41,264 INFO L402 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1] [2018-12-03 16:53:41,264 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:53:41,265 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:53:41,265 INFO L82 PathProgramCache]: Analyzing trace with hash 2056396679, now seen corresponding path program 46 times [2018-12-03 16:53:41,265 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:53:41,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:41,265 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:53:41,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:41,265 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:53:41,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:42,338 INFO L134 CoverageAnalysis]: Checked inductivity of 2565 backedges. 1485 proven. 1080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:42,338 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:42,338 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:53:42,338 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:53:42,338 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:53:42,338 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:42,339 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:53:42,347 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:53:42,347 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:53:42,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:42,388 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:53:44,116 INFO L134 CoverageAnalysis]: Checked inductivity of 2565 backedges. 1485 proven. 1080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:44,116 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:53:45,043 INFO L134 CoverageAnalysis]: Checked inductivity of 2565 backedges. 1485 proven. 1080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:45,062 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:53:45,062 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 85 [2018-12-03 16:53:45,062 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:53:45,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-03 16:53:45,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-03 16:53:45,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 16:53:45,064 INFO L87 Difference]: Start difference. First operand 196 states and 198 transitions. Second operand 86 states. [2018-12-03 16:53:47,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:53:47,397 INFO L93 Difference]: Finished difference Result 420 states and 424 transitions. [2018-12-03 16:53:47,397 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-12-03 16:53:47,398 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 195 [2018-12-03 16:53:47,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:53:47,399 INFO L225 Difference]: With dead ends: 420 [2018-12-03 16:53:47,399 INFO L226 Difference]: Without dead ends: 201 [2018-12-03 16:53:47,401 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 306 SyntacticMatches, 55 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4482 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=2983, Invalid=9899, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 16:53:47,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2018-12-03 16:53:47,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 199. [2018-12-03 16:53:47,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-12-03 16:53:47,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 201 transitions. [2018-12-03 16:53:47,446 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 201 transitions. Word has length 195 [2018-12-03 16:53:47,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:53:47,447 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 201 transitions. [2018-12-03 16:53:47,447 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-03 16:53:47,447 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 201 transitions. [2018-12-03 16:53:47,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2018-12-03 16:53:47,447 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:53:47,448 INFO L402 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 27, 1, 1, 1, 1, 1] [2018-12-03 16:53:47,448 INFO L423 AbstractCegarLoop]: === Iteration 51 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:53:47,448 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:53:47,448 INFO L82 PathProgramCache]: Analyzing trace with hash -303839985, now seen corresponding path program 47 times [2018-12-03 16:53:47,448 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:53:47,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:47,449 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:53:47,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:53:47,449 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:53:47,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:53:49,562 INFO L134 CoverageAnalysis]: Checked inductivity of 2647 backedges. 27 proven. 2620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:49,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:49,563 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:53:49,563 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:53:49,563 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:53:49,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:53:49,563 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:53:49,571 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:53:49,572 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:53:49,628 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2018-12-03 16:53:49,628 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:53:49,632 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:53:51,644 INFO L134 CoverageAnalysis]: Checked inductivity of 2647 backedges. 27 proven. 2620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:51,644 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:53:51,841 INFO L134 CoverageAnalysis]: Checked inductivity of 2647 backedges. 27 proven. 2620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:53:51,860 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:53:51,860 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 88 [2018-12-03 16:53:51,861 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:53:51,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 16:53:51,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 16:53:51,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=7598, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 16:53:51,862 INFO L87 Difference]: Start difference. First operand 199 states and 201 transitions. Second operand 89 states. [2018-12-03 16:54:00,570 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2018-12-03 16:54:00,989 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2018-12-03 16:54:01,399 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-12-03 16:54:01,689 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 16:54:01,996 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 16:54:02,268 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 16:54:02,534 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 16:54:02,787 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 16:54:03,033 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 16:54:03,264 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 16:54:03,486 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 16:54:04,329 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2018-12-03 16:54:05,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:54:05,989 INFO L93 Difference]: Finished difference Result 424 states and 429 transitions. [2018-12-03 16:54:05,989 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2018-12-03 16:54:05,989 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 198 [2018-12-03 16:54:05,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:54:05,992 INFO L225 Difference]: With dead ends: 424 [2018-12-03 16:54:05,992 INFO L226 Difference]: Without dead ends: 314 [2018-12-03 16:54:05,993 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 363 SyntacticMatches, 3 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3314 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=1271, Invalid=19609, Unknown=0, NotChecked=0, Total=20880 [2018-12-03 16:54:05,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2018-12-03 16:54:06,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 203. [2018-12-03 16:54:06,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 203 states. [2018-12-03 16:54:06,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 205 transitions. [2018-12-03 16:54:06,042 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 205 transitions. Word has length 198 [2018-12-03 16:54:06,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:54:06,042 INFO L480 AbstractCegarLoop]: Abstraction has 203 states and 205 transitions. [2018-12-03 16:54:06,042 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 16:54:06,042 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 205 transitions. [2018-12-03 16:54:06,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2018-12-03 16:54:06,043 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:54:06,043 INFO L402 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 28, 28, 1, 1, 1, 1, 1] [2018-12-03 16:54:06,043 INFO L423 AbstractCegarLoop]: === Iteration 52 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:54:06,044 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:54:06,044 INFO L82 PathProgramCache]: Analyzing trace with hash -1908736842, now seen corresponding path program 48 times [2018-12-03 16:54:06,044 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:54:06,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:06,045 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:54:06,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:06,045 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:54:06,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:07,179 INFO L134 CoverageAnalysis]: Checked inductivity of 2758 backedges. 1596 proven. 1162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:07,179 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:07,179 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:54:07,179 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:54:07,179 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:54:07,179 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:07,179 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 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:54:07,187 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:54:07,188 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:54:07,221 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:54:07,221 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:54:07,224 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:54:08,543 INFO L134 CoverageAnalysis]: Checked inductivity of 2758 backedges. 1596 proven. 1162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:08,543 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:54:09,798 INFO L134 CoverageAnalysis]: Checked inductivity of 2758 backedges. 1596 proven. 1162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:09,818 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:54:09,818 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 88 [2018-12-03 16:54:09,818 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:54:09,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 16:54:09,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 16:54:09,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 16:54:09,820 INFO L87 Difference]: Start difference. First operand 203 states and 205 transitions. Second operand 89 states. [2018-12-03 16:54:12,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:54:12,257 INFO L93 Difference]: Finished difference Result 435 states and 439 transitions. [2018-12-03 16:54:12,257 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-12-03 16:54:12,257 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 202 [2018-12-03 16:54:12,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:54:12,259 INFO L225 Difference]: With dead ends: 435 [2018-12-03 16:54:12,259 INFO L226 Difference]: Without dead ends: 208 [2018-12-03 16:54:12,260 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 317 SyntacticMatches, 57 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4816 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=3191, Invalid=10615, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 16:54:12,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-12-03 16:54:12,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 206. [2018-12-03 16:54:12,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2018-12-03 16:54:12,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 208 transitions. [2018-12-03 16:54:12,312 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 208 transitions. Word has length 202 [2018-12-03 16:54:12,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:54:12,312 INFO L480 AbstractCegarLoop]: Abstraction has 206 states and 208 transitions. [2018-12-03 16:54:12,312 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 16:54:12,313 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 208 transitions. [2018-12-03 16:54:12,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2018-12-03 16:54:12,313 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:54:12,314 INFO L402 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 28, 28, 28, 1, 1, 1, 1, 1] [2018-12-03 16:54:12,314 INFO L423 AbstractCegarLoop]: === Iteration 53 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:54:12,314 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:54:12,314 INFO L82 PathProgramCache]: Analyzing trace with hash 1062571566, now seen corresponding path program 49 times [2018-12-03 16:54:12,314 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:54:12,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:12,315 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:54:12,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:12,315 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:54:12,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:14,289 INFO L134 CoverageAnalysis]: Checked inductivity of 2843 backedges. 28 proven. 2815 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:14,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:14,289 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:54:14,289 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:54:14,289 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:54:14,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:14,290 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 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:54:14,300 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:54:14,300 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:54:14,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:14,344 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:54:16,742 INFO L134 CoverageAnalysis]: Checked inductivity of 2843 backedges. 28 proven. 2815 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:16,742 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:54:16,943 INFO L134 CoverageAnalysis]: Checked inductivity of 2843 backedges. 28 proven. 2815 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:16,962 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:54:16,962 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 60, 60] total 91 [2018-12-03 16:54:16,962 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:54:16,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-12-03 16:54:16,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-12-03 16:54:16,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=8130, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 16:54:16,964 INFO L87 Difference]: Start difference. First operand 206 states and 208 transitions. Second operand 92 states. [2018-12-03 16:54:26,202 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2018-12-03 16:54:26,651 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2018-12-03 16:54:27,116 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2018-12-03 16:54:27,422 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 16:54:27,724 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 16:54:28,016 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 16:54:28,297 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 16:54:28,572 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 16:54:28,840 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 16:54:29,088 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 16:54:29,339 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 16:54:29,570 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 16:54:29,813 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-03 16:54:30,109 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2018-12-03 16:54:32,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:54:32,189 INFO L93 Difference]: Finished difference Result 439 states and 444 transitions. [2018-12-03 16:54:32,190 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2018-12-03 16:54:32,190 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 205 [2018-12-03 16:54:32,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:54:32,192 INFO L225 Difference]: With dead ends: 439 [2018-12-03 16:54:32,192 INFO L226 Difference]: Without dead ends: 325 [2018-12-03 16:54:32,193 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 527 GetRequests, 376 SyntacticMatches, 3 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3548 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=1345, Invalid=21005, Unknown=0, NotChecked=0, Total=22350 [2018-12-03 16:54:32,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2018-12-03 16:54:32,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 210. [2018-12-03 16:54:32,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-12-03 16:54:32,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 212 transitions. [2018-12-03 16:54:32,241 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 212 transitions. Word has length 205 [2018-12-03 16:54:32,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:54:32,242 INFO L480 AbstractCegarLoop]: Abstraction has 210 states and 212 transitions. [2018-12-03 16:54:32,242 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-12-03 16:54:32,242 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 212 transitions. [2018-12-03 16:54:32,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-12-03 16:54:32,243 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:54:32,243 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1] [2018-12-03 16:54:32,243 INFO L423 AbstractCegarLoop]: === Iteration 54 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:54:32,243 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:54:32,244 INFO L82 PathProgramCache]: Analyzing trace with hash -782950827, now seen corresponding path program 50 times [2018-12-03 16:54:32,244 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:54:32,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:32,244 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:54:32,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:32,245 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:54:32,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:33,488 INFO L134 CoverageAnalysis]: Checked inductivity of 2958 backedges. 1711 proven. 1247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:33,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:33,489 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:54:33,489 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:54:33,489 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:54:33,489 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:33,489 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 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:54:33,502 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:54:33,502 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:54:33,563 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-12-03 16:54:33,563 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:54:33,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:54:35,396 INFO L134 CoverageAnalysis]: Checked inductivity of 2958 backedges. 1711 proven. 1247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:35,396 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:54:36,540 INFO L134 CoverageAnalysis]: Checked inductivity of 2958 backedges. 1711 proven. 1247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:36,558 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:54:36,559 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 91 [2018-12-03 16:54:36,559 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:54:36,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-12-03 16:54:36,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-12-03 16:54:36,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 16:54:36,560 INFO L87 Difference]: Start difference. First operand 210 states and 212 transitions. Second operand 92 states. [2018-12-03 16:54:39,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:54:39,249 INFO L93 Difference]: Finished difference Result 450 states and 454 transitions. [2018-12-03 16:54:39,250 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-12-03 16:54:39,250 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 209 [2018-12-03 16:54:39,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:54:39,251 INFO L225 Difference]: With dead ends: 450 [2018-12-03 16:54:39,251 INFO L226 Difference]: Without dead ends: 215 [2018-12-03 16:54:39,252 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 328 SyntacticMatches, 59 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5162 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=3406, Invalid=11356, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 16:54:39,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2018-12-03 16:54:39,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 213. [2018-12-03 16:54:39,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-12-03 16:54:39,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 215 transitions. [2018-12-03 16:54:39,321 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 215 transitions. Word has length 209 [2018-12-03 16:54:39,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:54:39,322 INFO L480 AbstractCegarLoop]: Abstraction has 213 states and 215 transitions. [2018-12-03 16:54:39,322 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-12-03 16:54:39,322 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 215 transitions. [2018-12-03 16:54:39,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-12-03 16:54:39,323 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:54:39,323 INFO L402 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 29, 29, 29, 1, 1, 1, 1, 1] [2018-12-03 16:54:39,323 INFO L423 AbstractCegarLoop]: === Iteration 55 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:54:39,324 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:54:39,324 INFO L82 PathProgramCache]: Analyzing trace with hash -890079779, now seen corresponding path program 51 times [2018-12-03 16:54:39,324 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:54:39,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:39,325 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:54:39,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:54:39,325 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:54:39,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:54:41,692 INFO L134 CoverageAnalysis]: Checked inductivity of 3046 backedges. 29 proven. 3017 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:41,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:41,692 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:54:41,692 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:54:41,692 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:54:41,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:54:41,692 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 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:54:41,702 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:54:41,702 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:54:41,743 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:54:41,743 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:54:41,748 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:54:44,262 INFO L134 CoverageAnalysis]: Checked inductivity of 3046 backedges. 29 proven. 3017 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:44,263 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:54:44,508 INFO L134 CoverageAnalysis]: Checked inductivity of 3046 backedges. 29 proven. 3017 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:54:44,526 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:54:44,526 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 94 [2018-12-03 16:54:44,526 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:54:44,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 16:54:44,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 16:54:44,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=8680, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 16:54:44,527 INFO L87 Difference]: Start difference. First operand 213 states and 215 transitions. Second operand 95 states. [2018-12-03 16:54:54,958 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 153 [2018-12-03 16:54:55,470 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 153 [2018-12-03 16:54:56,000 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2018-12-03 16:54:56,312 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 16:54:56,614 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 16:54:56,918 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 16:54:57,223 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 16:54:57,530 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 16:54:57,813 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 16:54:58,081 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 16:54:58,340 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 16:54:58,604 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 16:54:58,850 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 16:55:01,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:55:01,603 INFO L93 Difference]: Finished difference Result 454 states and 459 transitions. [2018-12-03 16:55:01,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2018-12-03 16:55:01,603 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 212 [2018-12-03 16:55:01,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:55:01,605 INFO L225 Difference]: With dead ends: 454 [2018-12-03 16:55:01,606 INFO L226 Difference]: Without dead ends: 336 [2018-12-03 16:55:01,607 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 545 GetRequests, 389 SyntacticMatches, 3 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3790 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=1421, Invalid=22449, Unknown=0, NotChecked=0, Total=23870 [2018-12-03 16:55:01,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2018-12-03 16:55:01,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 217. [2018-12-03 16:55:01,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2018-12-03 16:55:01,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 219 transitions. [2018-12-03 16:55:01,663 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 219 transitions. Word has length 212 [2018-12-03 16:55:01,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:55:01,663 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 219 transitions. [2018-12-03 16:55:01,663 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 16:55:01,664 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 219 transitions. [2018-12-03 16:55:01,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2018-12-03 16:55:01,664 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:55:01,664 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 30, 30, 1, 1, 1, 1, 1] [2018-12-03 16:55:01,665 INFO L423 AbstractCegarLoop]: === Iteration 56 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:55:01,665 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:55:01,665 INFO L82 PathProgramCache]: Analyzing trace with hash -272066940, now seen corresponding path program 52 times [2018-12-03 16:55:01,665 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:55:01,665 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:01,666 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:55:01,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:01,666 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:55:01,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:55:02,947 INFO L134 CoverageAnalysis]: Checked inductivity of 3165 backedges. 1830 proven. 1335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:02,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:02,947 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:55:02,947 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:55:02,947 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:55:02,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:02,947 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:55:02,956 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:55:02,956 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:55:02,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:55:03,000 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:55:04,501 INFO L134 CoverageAnalysis]: Checked inductivity of 3165 backedges. 1830 proven. 1335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:04,502 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:55:05,752 INFO L134 CoverageAnalysis]: Checked inductivity of 3165 backedges. 1830 proven. 1335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:05,771 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:55:05,771 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 94 [2018-12-03 16:55:05,771 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:55:05,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 16:55:05,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 16:55:05,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 16:55:05,772 INFO L87 Difference]: Start difference. First operand 217 states and 219 transitions. Second operand 95 states. [2018-12-03 16:55:08,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:55:08,660 INFO L93 Difference]: Finished difference Result 465 states and 469 transitions. [2018-12-03 16:55:08,661 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-12-03 16:55:08,661 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 216 [2018-12-03 16:55:08,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:55:08,662 INFO L225 Difference]: With dead ends: 465 [2018-12-03 16:55:08,662 INFO L226 Difference]: Without dead ends: 222 [2018-12-03 16:55:08,663 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 524 GetRequests, 339 SyntacticMatches, 61 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5520 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3628, Invalid=12122, Unknown=0, NotChecked=0, Total=15750 [2018-12-03 16:55:08,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-12-03 16:55:08,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 220. [2018-12-03 16:55:08,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2018-12-03 16:55:08,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 222 transitions. [2018-12-03 16:55:08,716 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 222 transitions. Word has length 216 [2018-12-03 16:55:08,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:55:08,716 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 222 transitions. [2018-12-03 16:55:08,716 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 16:55:08,716 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 222 transitions. [2018-12-03 16:55:08,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-12-03 16:55:08,717 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:55:08,717 INFO L402 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 30, 30, 30, 1, 1, 1, 1, 1] [2018-12-03 16:55:08,717 INFO L423 AbstractCegarLoop]: === Iteration 57 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:55:08,717 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:55:08,717 INFO L82 PathProgramCache]: Analyzing trace with hash 292238844, now seen corresponding path program 53 times [2018-12-03 16:55:08,718 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:55:08,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:08,718 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:55:08,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:08,718 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:55:08,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:55:11,292 INFO L134 CoverageAnalysis]: Checked inductivity of 3256 backedges. 30 proven. 3226 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:11,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:11,292 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:55:11,292 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:55:11,292 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:55:11,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:55:11,292 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:55:11,301 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:55:11,301 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:55:11,364 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-12-03 16:55:11,364 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:55:11,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:55:17,466 INFO L134 CoverageAnalysis]: Checked inductivity of 3256 backedges. 1800 proven. 1456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:17,467 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:55:23,247 INFO L134 CoverageAnalysis]: Checked inductivity of 3256 backedges. 1770 proven. 1486 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:55:23,266 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:55:23,266 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 66, 66] total 163 [2018-12-03 16:55:23,266 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:55:23,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2018-12-03 16:55:23,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2018-12-03 16:55:23,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2878, Invalid=23854, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 16:55:23,268 INFO L87 Difference]: Start difference. First operand 220 states and 222 transitions. Second operand 131 states. [2018-12-03 16:55:47,919 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2018-12-03 16:55:48,486 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2018-12-03 16:55:49,100 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 153 [2018-12-03 16:55:49,621 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 16:55:50,113 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 16:55:50,602 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 16:55:51,077 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 16:55:51,524 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 16:55:52,025 WARN L180 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 16:55:52,466 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 16:55:52,875 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 16:55:53,282 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 16:55:53,663 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 16:55:54,034 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 16:55:57,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:55:57,852 INFO L93 Difference]: Finished difference Result 591 states and 597 transitions. [2018-12-03 16:55:57,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 219 states. [2018-12-03 16:55:57,852 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 219 [2018-12-03 16:55:57,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:55:57,854 INFO L225 Difference]: With dead ends: 591 [2018-12-03 16:55:57,854 INFO L226 Difference]: Without dead ends: 344 [2018-12-03 16:55:57,858 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 687 GetRequests, 307 SyntacticMatches, 32 SemanticMatches, 348 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26556 ImplicationChecksByTransitivity, 39.7s TimeCoverageRelationStatistics Valid=8585, Invalid=113565, Unknown=0, NotChecked=0, Total=122150 [2018-12-03 16:55:57,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2018-12-03 16:55:57,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 227. [2018-12-03 16:55:57,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 227 states. [2018-12-03 16:55:57,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 229 transitions. [2018-12-03 16:55:57,912 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 229 transitions. Word has length 219 [2018-12-03 16:55:57,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:55:57,912 INFO L480 AbstractCegarLoop]: Abstraction has 227 states and 229 transitions. [2018-12-03 16:55:57,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has 131 states. [2018-12-03 16:55:57,912 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 229 transitions. [2018-12-03 16:55:57,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2018-12-03 16:55:57,913 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:55:57,913 INFO L402 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 31, 31, 31, 1, 1, 1, 1, 1] [2018-12-03 16:55:57,914 INFO L423 AbstractCegarLoop]: === Iteration 58 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:55:57,914 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:55:57,914 INFO L82 PathProgramCache]: Analyzing trace with hash 2116008107, now seen corresponding path program 54 times [2018-12-03 16:55:57,914 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:55:57,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:57,914 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:55:57,915 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:55:57,915 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:55:57,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:56:00,355 INFO L134 CoverageAnalysis]: Checked inductivity of 3473 backedges. 31 proven. 3442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:00,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:00,355 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:56:00,355 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:56:00,355 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:56:00,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:00,355 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 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:56:00,364 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:56:00,365 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:56:00,403 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:56:00,403 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:56:00,407 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:56:03,283 INFO L134 CoverageAnalysis]: Checked inductivity of 3473 backedges. 31 proven. 3442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:03,284 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:56:03,538 INFO L134 CoverageAnalysis]: Checked inductivity of 3473 backedges. 31 proven. 3442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:03,557 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:56:03,557 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66, 66] total 100 [2018-12-03 16:56:03,557 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:56:03,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 16:56:03,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 16:56:03,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=9834, Unknown=0, NotChecked=0, Total=10100 [2018-12-03 16:56:03,558 INFO L87 Difference]: Start difference. First operand 227 states and 229 transitions. Second operand 101 states. [2018-12-03 16:56:16,525 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 163 [2018-12-03 16:56:17,035 WARN L180 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 163 [2018-12-03 16:56:17,620 WARN L180 SmtUtils]: Spent 276.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2018-12-03 16:56:17,968 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 16:56:18,315 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 16:56:18,653 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 16:56:18,995 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 16:56:19,312 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 16:56:19,622 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 16:56:19,930 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 16:56:20,223 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 16:56:20,502 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 16:56:20,773 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 16:56:21,027 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 16:56:21,283 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 16:56:21,540 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-03 16:56:22,471 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2018-12-03 16:56:24,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:56:24,124 INFO L93 Difference]: Finished difference Result 484 states and 489 transitions. [2018-12-03 16:56:24,125 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2018-12-03 16:56:24,125 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 226 [2018-12-03 16:56:24,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:56:24,127 INFO L225 Difference]: With dead ends: 484 [2018-12-03 16:56:24,127 INFO L226 Difference]: Without dead ends: 358 [2018-12-03 16:56:24,128 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 581 GetRequests, 415 SyntacticMatches, 3 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4298 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=1579, Invalid=25481, Unknown=0, NotChecked=0, Total=27060 [2018-12-03 16:56:24,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2018-12-03 16:56:24,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 231. [2018-12-03 16:56:24,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 231 states. [2018-12-03 16:56:24,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 233 transitions. [2018-12-03 16:56:24,212 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 233 transitions. Word has length 226 [2018-12-03 16:56:24,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:56:24,212 INFO L480 AbstractCegarLoop]: Abstraction has 231 states and 233 transitions. [2018-12-03 16:56:24,212 INFO L481 AbstractCegarLoop]: Interpolant automaton has 101 states. [2018-12-03 16:56:24,212 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 233 transitions. [2018-12-03 16:56:24,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2018-12-03 16:56:24,213 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:56:24,213 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 32, 32, 1, 1, 1, 1, 1] [2018-12-03 16:56:24,214 INFO L423 AbstractCegarLoop]: === Iteration 59 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:56:24,214 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:56:24,214 INFO L82 PathProgramCache]: Analyzing trace with hash -237256110, now seen corresponding path program 55 times [2018-12-03 16:56:24,214 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:56:24,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:24,215 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:56:24,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:24,215 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:56:24,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:56:25,724 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 2080 proven. 1520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:25,725 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:25,725 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:56:25,725 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:56:25,725 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:56:25,725 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:25,725 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 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:56:25,734 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:56:25,734 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:56:25,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:56:25,780 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:56:29,404 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 2080 proven. 1520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:29,405 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:56:30,996 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 2080 proven. 1520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:31,017 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:56:31,017 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 100 [2018-12-03 16:56:31,017 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:56:31,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 16:56:31,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 16:56:31,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2018-12-03 16:56:31,018 INFO L87 Difference]: Start difference. First operand 231 states and 233 transitions. Second operand 101 states. [2018-12-03 16:56:33,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:56:33,500 INFO L93 Difference]: Finished difference Result 495 states and 499 transitions. [2018-12-03 16:56:33,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-12-03 16:56:33,501 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 230 [2018-12-03 16:56:33,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:56:33,502 INFO L225 Difference]: With dead ends: 495 [2018-12-03 16:56:33,502 INFO L226 Difference]: Without dead ends: 236 [2018-12-03 16:56:33,503 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 558 GetRequests, 361 SyntacticMatches, 65 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6272 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 16:56:33,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2018-12-03 16:56:33,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 234. [2018-12-03 16:56:33,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2018-12-03 16:56:33,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 236 transitions. [2018-12-03 16:56:33,560 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 236 transitions. Word has length 230 [2018-12-03 16:56:33,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:56:33,560 INFO L480 AbstractCegarLoop]: Abstraction has 234 states and 236 transitions. [2018-12-03 16:56:33,560 INFO L481 AbstractCegarLoop]: Interpolant automaton has 101 states. [2018-12-03 16:56:33,560 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 236 transitions. [2018-12-03 16:56:33,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2018-12-03 16:56:33,561 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:56:33,562 INFO L402 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 32, 32, 32, 1, 1, 1, 1, 1] [2018-12-03 16:56:33,562 INFO L423 AbstractCegarLoop]: === Iteration 60 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:56:33,562 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:56:33,562 INFO L82 PathProgramCache]: Analyzing trace with hash -170528822, now seen corresponding path program 56 times [2018-12-03 16:56:33,562 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:56:33,563 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:33,563 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:56:33,563 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:56:33,563 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:56:33,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:56:36,139 INFO L134 CoverageAnalysis]: Checked inductivity of 3697 backedges. 32 proven. 3665 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:36,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:36,139 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:56:36,139 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:56:36,139 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:56:36,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:56:36,139 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 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:56:36,148 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:56:36,148 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:56:36,226 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-12-03 16:56:36,227 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:56:36,231 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:56:43,141 INFO L134 CoverageAnalysis]: Checked inductivity of 3697 backedges. 2048 proven. 1649 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:43,141 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:56:49,638 INFO L134 CoverageAnalysis]: Checked inductivity of 3697 backedges. 2016 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:56:49,657 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:56:49,657 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 70, 70] total 173 [2018-12-03 16:56:49,657 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:56:49,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 139 states [2018-12-03 16:56:49,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2018-12-03 16:56:49,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3227, Invalid=26875, Unknown=0, NotChecked=0, Total=30102 [2018-12-03 16:56:49,659 INFO L87 Difference]: Start difference. First operand 234 states and 236 transitions. Second operand 139 states. [2018-12-03 16:57:15,577 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification that was a NOOP. DAG size: 168 [2018-12-03 16:57:16,191 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 168 [2018-12-03 16:57:16,839 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification that was a NOOP. DAG size: 163 [2018-12-03 16:57:17,392 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 16:57:17,924 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 16:57:18,457 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 16:57:19,085 WARN L180 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 16:57:19,598 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 16:57:20,087 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 16:57:20,562 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 16:57:21,041 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 16:57:21,489 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 16:57:21,919 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 16:57:22,331 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 16:57:22,753 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 16:57:23,147 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 16:57:23,863 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2018-12-03 16:57:27,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:57:27,113 INFO L93 Difference]: Finished difference Result 629 states and 635 transitions. [2018-12-03 16:57:27,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 233 states. [2018-12-03 16:57:27,113 INFO L78 Accepts]: Start accepts. Automaton has 139 states. Word has length 233 [2018-12-03 16:57:27,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:57:27,115 INFO L225 Difference]: With dead ends: 629 [2018-12-03 16:57:27,115 INFO L226 Difference]: Without dead ends: 366 [2018-12-03 16:57:27,119 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 731 GetRequests, 327 SyntacticMatches, 34 SemanticMatches, 370 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30017 ImplicationChecksByTransitivity, 44.5s TimeCoverageRelationStatistics Valid=9599, Invalid=128413, Unknown=0, NotChecked=0, Total=138012 [2018-12-03 16:57:27,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2018-12-03 16:57:27,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 241. [2018-12-03 16:57:27,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2018-12-03 16:57:27,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 243 transitions. [2018-12-03 16:57:27,181 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 243 transitions. Word has length 233 [2018-12-03 16:57:27,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:57:27,181 INFO L480 AbstractCegarLoop]: Abstraction has 241 states and 243 transitions. [2018-12-03 16:57:27,182 INFO L481 AbstractCegarLoop]: Interpolant automaton has 139 states. [2018-12-03 16:57:27,182 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 243 transitions. [2018-12-03 16:57:27,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2018-12-03 16:57:27,182 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:57:27,183 INFO L402 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 33, 33, 33, 1, 1, 1, 1, 1] [2018-12-03 16:57:27,183 INFO L423 AbstractCegarLoop]: === Iteration 61 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:57:27,183 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:57:27,183 INFO L82 PathProgramCache]: Analyzing trace with hash 1552518521, now seen corresponding path program 57 times [2018-12-03 16:57:27,183 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:57:27,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:57:27,184 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:57:27,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:57:27,184 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:57:27,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:57:30,013 INFO L134 CoverageAnalysis]: Checked inductivity of 3928 backedges. 33 proven. 3895 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:30,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:57:30,013 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:57:30,013 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:57:30,013 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:57:30,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:57:30,014 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:57:30,025 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:57:30,025 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:57:30,066 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:57:30,066 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:57:30,070 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:57:32,943 INFO L134 CoverageAnalysis]: Checked inductivity of 3928 backedges. 33 proven. 3895 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:32,943 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:57:33,191 INFO L134 CoverageAnalysis]: Checked inductivity of 3928 backedges. 33 proven. 3895 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:33,210 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:57:33,210 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70, 70] total 106 [2018-12-03 16:57:33,210 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:57:33,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-12-03 16:57:33,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-12-03 16:57:33,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=11060, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 16:57:33,211 INFO L87 Difference]: Start difference. First operand 241 states and 243 transitions. Second operand 107 states. [2018-12-03 16:57:45,599 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 173 [2018-12-03 16:57:46,151 WARN L180 SmtUtils]: Spent 231.00 ms on a formula simplification that was a NOOP. DAG size: 173 [2018-12-03 16:57:46,701 WARN L180 SmtUtils]: Spent 219.00 ms on a formula simplification that was a NOOP. DAG size: 168 [2018-12-03 16:57:47,082 WARN L180 SmtUtils]: Spent 215.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-03 16:57:47,460 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 16:57:47,828 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 16:57:48,203 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 16:57:48,551 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 16:57:48,898 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 16:57:49,234 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 16:57:49,605 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 16:57:49,952 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 16:57:50,259 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 16:57:50,557 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 16:57:50,840 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 16:57:51,128 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 16:57:51,393 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 16:57:54,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:57:54,312 INFO L93 Difference]: Finished difference Result 514 states and 519 transitions. [2018-12-03 16:57:54,312 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2018-12-03 16:57:54,312 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 240 [2018-12-03 16:57:54,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:57:54,313 INFO L225 Difference]: With dead ends: 514 [2018-12-03 16:57:54,313 INFO L226 Difference]: Without dead ends: 380 [2018-12-03 16:57:54,314 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 617 GetRequests, 441 SyntacticMatches, 3 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4838 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=1745, Invalid=28705, Unknown=0, NotChecked=0, Total=30450 [2018-12-03 16:57:54,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2018-12-03 16:57:54,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 245. [2018-12-03 16:57:54,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245 states. [2018-12-03 16:57:54,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 247 transitions. [2018-12-03 16:57:54,379 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 247 transitions. Word has length 240 [2018-12-03 16:57:54,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:57:54,380 INFO L480 AbstractCegarLoop]: Abstraction has 245 states and 247 transitions. [2018-12-03 16:57:54,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-12-03 16:57:54,380 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 247 transitions. [2018-12-03 16:57:54,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2018-12-03 16:57:54,381 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:57:54,381 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 34, 34, 1, 1, 1, 1, 1] [2018-12-03 16:57:54,381 INFO L423 AbstractCegarLoop]: === Iteration 62 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:57:54,381 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:57:54,381 INFO L82 PathProgramCache]: Analyzing trace with hash 714244128, now seen corresponding path program 58 times [2018-12-03 16:57:54,381 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:57:54,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:57:54,382 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:57:54,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:57:54,382 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:57:54,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:57:56,260 INFO L134 CoverageAnalysis]: Checked inductivity of 4063 backedges. 2346 proven. 1717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:56,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:57:56,261 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:57:56,261 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:57:56,261 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:57:56,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:57:56,261 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:57:56,272 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:57:56,272 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:57:56,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:57:56,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:57:58,240 INFO L134 CoverageAnalysis]: Checked inductivity of 4063 backedges. 2346 proven. 1717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:58,240 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:57:59,832 INFO L134 CoverageAnalysis]: Checked inductivity of 4063 backedges. 2346 proven. 1717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:57:59,851 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:57:59,851 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 106 [2018-12-03 16:57:59,851 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:57:59,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-12-03 16:57:59,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-12-03 16:57:59,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 16:57:59,852 INFO L87 Difference]: Start difference. First operand 245 states and 247 transitions. Second operand 107 states. [2018-12-03 16:58:02,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:58:02,559 INFO L93 Difference]: Finished difference Result 525 states and 529 transitions. [2018-12-03 16:58:02,559 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-03 16:58:02,560 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 244 [2018-12-03 16:58:02,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:58:02,561 INFO L225 Difference]: With dead ends: 525 [2018-12-03 16:58:02,561 INFO L226 Difference]: Without dead ends: 250 [2018-12-03 16:58:02,562 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 383 SyntacticMatches, 69 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7072 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=4586, Invalid=15436, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 16:58:02,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2018-12-03 16:58:02,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 248. [2018-12-03 16:58:02,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2018-12-03 16:58:02,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 250 transitions. [2018-12-03 16:58:02,625 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 250 transitions. Word has length 244 [2018-12-03 16:58:02,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:58:02,625 INFO L480 AbstractCegarLoop]: Abstraction has 248 states and 250 transitions. [2018-12-03 16:58:02,625 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-12-03 16:58:02,625 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 250 transitions. [2018-12-03 16:58:02,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2018-12-03 16:58:02,626 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:58:02,626 INFO L402 BasicCegarLoop]: trace histogram [35, 35, 35, 35, 34, 34, 34, 1, 1, 1, 1, 1] [2018-12-03 16:58:02,627 INFO L423 AbstractCegarLoop]: === Iteration 63 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:58:02,627 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:58:02,627 INFO L82 PathProgramCache]: Analyzing trace with hash 1637071768, now seen corresponding path program 59 times [2018-12-03 16:58:02,627 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:58:02,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:58:02,628 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:58:02,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:58:02,628 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:58:02,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:58:05,683 INFO L134 CoverageAnalysis]: Checked inductivity of 4166 backedges. 34 proven. 4132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:58:05,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:58:05,683 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:58:05,683 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:58:05,683 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:58:05,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:58:05,683 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 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:58:05,693 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:58:05,693 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:58:05,770 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-12-03 16:58:05,770 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:58:05,774 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:58:13,376 INFO L134 CoverageAnalysis]: Checked inductivity of 4166 backedges. 2312 proven. 1854 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:58:13,377 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:58:21,841 INFO L134 CoverageAnalysis]: Checked inductivity of 4166 backedges. 2278 proven. 1888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:58:21,859 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:58:21,860 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 74, 74] total 183 [2018-12-03 16:58:21,860 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:58:21,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 147 states [2018-12-03 16:58:21,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2018-12-03 16:58:21,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3596, Invalid=30076, Unknown=0, NotChecked=0, Total=33672 [2018-12-03 16:58:21,861 INFO L87 Difference]: Start difference. First operand 248 states and 250 transitions. Second operand 147 states. [2018-12-03 16:58:50,062 WARN L180 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2018-12-03 16:58:50,726 WARN L180 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2018-12-03 16:58:51,455 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 173 [2018-12-03 16:58:52,091 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-03 16:58:52,707 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-03 16:58:53,321 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 16:58:53,896 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 16:58:54,460 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 16:58:55,013 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 16:58:55,573 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 16:58:56,136 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 16:58:56,654 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 16:58:57,142 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 16:58:57,643 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 16:58:58,101 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 16:58:58,533 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 16:58:58,954 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 16:58:59,350 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 16:59:03,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:59:03,614 INFO L93 Difference]: Finished difference Result 667 states and 673 transitions. [2018-12-03 16:59:03,615 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 247 states. [2018-12-03 16:59:03,615 INFO L78 Accepts]: Start accepts. Automaton has 147 states. Word has length 247 [2018-12-03 16:59:03,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:59:03,617 INFO L225 Difference]: With dead ends: 667 [2018-12-03 16:59:03,617 INFO L226 Difference]: Without dead ends: 388 [2018-12-03 16:59:03,621 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 775 GetRequests, 347 SyntacticMatches, 36 SemanticMatches, 392 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33690 ImplicationChecksByTransitivity, 51.4s TimeCoverageRelationStatistics Valid=10669, Invalid=144173, Unknown=0, NotChecked=0, Total=154842 [2018-12-03 16:59:03,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 388 states. [2018-12-03 16:59:03,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 388 to 255. [2018-12-03 16:59:03,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 255 states. [2018-12-03 16:59:03,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 257 transitions. [2018-12-03 16:59:03,692 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 257 transitions. Word has length 247 [2018-12-03 16:59:03,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:59:03,692 INFO L480 AbstractCegarLoop]: Abstraction has 255 states and 257 transitions. [2018-12-03 16:59:03,692 INFO L481 AbstractCegarLoop]: Interpolant automaton has 147 states. [2018-12-03 16:59:03,692 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 257 transitions. [2018-12-03 16:59:03,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2018-12-03 16:59:03,694 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:59:03,694 INFO L402 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 35, 35, 35, 1, 1, 1, 1, 1] [2018-12-03 16:59:03,694 INFO L423 AbstractCegarLoop]: === Iteration 64 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:59:03,694 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:59:03,694 INFO L82 PathProgramCache]: Analyzing trace with hash -783420345, now seen corresponding path program 60 times [2018-12-03 16:59:03,695 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:59:03,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:59:03,695 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:59:03,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:59:03,696 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:59:03,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:59:06,984 INFO L134 CoverageAnalysis]: Checked inductivity of 4411 backedges. 35 proven. 4376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:59:06,984 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:59:06,985 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:59:06,985 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:59:06,985 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:59:06,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:59:06,985 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 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:59:06,995 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:59:06,995 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:59:07,041 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:59:07,041 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:59:07,046 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:59:10,255 INFO L134 CoverageAnalysis]: Checked inductivity of 4411 backedges. 35 proven. 4376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:59:10,255 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:59:10,519 INFO L134 CoverageAnalysis]: Checked inductivity of 4411 backedges. 35 proven. 4376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:59:10,540 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:59:10,540 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 74, 74] total 112 [2018-12-03 16:59:10,540 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:59:10,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2018-12-03 16:59:10,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2018-12-03 16:59:10,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=12358, Unknown=0, NotChecked=0, Total=12656 [2018-12-03 16:59:10,542 INFO L87 Difference]: Start difference. First operand 255 states and 257 transitions. Second operand 113 states. [2018-12-03 16:59:25,039 WARN L180 SmtUtils]: Spent 246.00 ms on a formula simplification that was a NOOP. DAG size: 183 [2018-12-03 16:59:25,622 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 183 [2018-12-03 16:59:26,197 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2018-12-03 16:59:26,604 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2018-12-03 16:59:27,061 WARN L180 SmtUtils]: Spent 256.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-03 16:59:27,467 WARN L180 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-03 16:59:27,864 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 16:59:28,245 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 16:59:28,612 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 16:59:28,973 WARN L180 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 16:59:29,322 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 16:59:29,661 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 16:59:30,010 WARN L180 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 16:59:30,334 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 16:59:30,645 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 16:59:30,958 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 16:59:31,245 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 16:59:31,525 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 16:59:31,797 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 16:59:32,129 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-03 16:59:34,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:59:34,850 INFO L93 Difference]: Finished difference Result 544 states and 549 transitions. [2018-12-03 16:59:34,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2018-12-03 16:59:34,850 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 254 [2018-12-03 16:59:34,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:59:34,852 INFO L225 Difference]: With dead ends: 544 [2018-12-03 16:59:34,853 INFO L226 Difference]: Without dead ends: 402 [2018-12-03 16:59:34,854 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 653 GetRequests, 467 SyntacticMatches, 3 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5410 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=1919, Invalid=32121, Unknown=0, NotChecked=0, Total=34040 [2018-12-03 16:59:34,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2018-12-03 16:59:34,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 259. [2018-12-03 16:59:34,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-12-03 16:59:34,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 261 transitions. [2018-12-03 16:59:34,920 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 261 transitions. Word has length 254 [2018-12-03 16:59:34,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:59:34,921 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 261 transitions. [2018-12-03 16:59:34,921 INFO L481 AbstractCegarLoop]: Interpolant automaton has 113 states. [2018-12-03 16:59:34,921 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 261 transitions. [2018-12-03 16:59:34,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-12-03 16:59:34,922 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:59:34,922 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 36, 36, 1, 1, 1, 1, 1] [2018-12-03 16:59:34,922 INFO L423 AbstractCegarLoop]: === Iteration 65 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:59:34,923 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:59:34,923 INFO L82 PathProgramCache]: Analyzing trace with hash 1175113710, now seen corresponding path program 61 times [2018-12-03 16:59:34,923 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:59:34,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:59:34,923 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:59:34,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:59:34,924 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:59:34,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:59:36,711 INFO L134 CoverageAnalysis]: Checked inductivity of 4554 backedges. 2628 proven. 1926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:59:36,712 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:59:36,712 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:59:36,712 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:59:36,712 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:59:36,712 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:59:36,712 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 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:59:36,723 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:59:36,723 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:59:36,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:59:36,775 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:59:39,192 INFO L134 CoverageAnalysis]: Checked inductivity of 4554 backedges. 2628 proven. 1926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:59:39,192 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:59:40,864 INFO L134 CoverageAnalysis]: Checked inductivity of 4554 backedges. 2628 proven. 1926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:59:40,883 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:59:40,883 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 112 [2018-12-03 16:59:40,883 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:59:40,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2018-12-03 16:59:40,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2018-12-03 16:59:40,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2018-12-03 16:59:40,896 INFO L87 Difference]: Start difference. First operand 259 states and 261 transitions. Second operand 113 states. [2018-12-03 16:59:44,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:59:44,023 INFO L93 Difference]: Finished difference Result 555 states and 559 transitions. [2018-12-03 16:59:44,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-12-03 16:59:44,024 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 258 [2018-12-03 16:59:44,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:59:44,025 INFO L225 Difference]: With dead ends: 555 [2018-12-03 16:59:44,025 INFO L226 Difference]: Without dead ends: 264 [2018-12-03 16:59:44,027 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 626 GetRequests, 405 SyntacticMatches, 73 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7920 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=5107, Invalid=17243, Unknown=0, NotChecked=0, Total=22350 [2018-12-03 16:59:44,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2018-12-03 16:59:44,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 262. [2018-12-03 16:59:44,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2018-12-03 16:59:44,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 264 transitions. [2018-12-03 16:59:44,098 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 264 transitions. Word has length 258 [2018-12-03 16:59:44,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:59:44,098 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 264 transitions. [2018-12-03 16:59:44,098 INFO L481 AbstractCegarLoop]: Interpolant automaton has 113 states. [2018-12-03 16:59:44,099 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 264 transitions. [2018-12-03 16:59:44,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2018-12-03 16:59:44,099 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:59:44,100 INFO L402 BasicCegarLoop]: trace histogram [37, 37, 37, 37, 36, 36, 36, 1, 1, 1, 1, 1] [2018-12-03 16:59:44,100 INFO L423 AbstractCegarLoop]: === Iteration 66 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:59:44,100 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:59:44,100 INFO L82 PathProgramCache]: Analyzing trace with hash 1470273894, now seen corresponding path program 62 times [2018-12-03 16:59:44,100 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:59:44,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:59:44,101 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:59:44,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:59:44,101 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:59:44,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:59:47,379 INFO L134 CoverageAnalysis]: Checked inductivity of 4663 backedges. 36 proven. 4627 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:59:47,379 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:59:47,379 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:59:47,380 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:59:47,380 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:59:47,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:59:47,380 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 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:59:47,389 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:59:47,390 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:59:47,506 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-12-03 16:59:47,507 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:59:47,511 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:59:55,859 INFO L134 CoverageAnalysis]: Checked inductivity of 4663 backedges. 2592 proven. 2071 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:59:55,860 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:00:04,001 INFO L134 CoverageAnalysis]: Checked inductivity of 4663 backedges. 2556 proven. 2107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:00:04,021 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:00:04,021 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 78, 78] total 193 [2018-12-03 17:00:04,021 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:00:04,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 155 states [2018-12-03 17:00:04,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2018-12-03 17:00:04,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3985, Invalid=33457, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 17:00:04,023 INFO L87 Difference]: Start difference. First operand 262 states and 264 transitions. Second operand 155 states. [2018-12-03 17:00:35,377 WARN L180 SmtUtils]: Spent 256.00 ms on a formula simplification that was a NOOP. DAG size: 188 [2018-12-03 17:00:36,089 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification that was a NOOP. DAG size: 188 [2018-12-03 17:00:36,843 WARN L180 SmtUtils]: Spent 243.00 ms on a formula simplification that was a NOOP. DAG size: 183 [2018-12-03 17:00:37,504 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 179 [2018-12-03 17:00:38,170 WARN L180 SmtUtils]: Spent 226.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2018-12-03 17:00:38,857 WARN L180 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-03 17:00:39,483 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-03 17:00:40,080 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 17:00:40,709 WARN L180 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 17:00:41,268 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 17:00:41,845 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 17:00:42,405 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 17:00:42,938 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 17:00:43,447 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 17:00:43,995 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 17:00:44,471 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 17:00:44,946 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 17:00:45,390 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 17:00:45,816 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 17:00:46,240 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 17:00:48,698 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2018-12-03 17:00:50,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:00:50,594 INFO L93 Difference]: Finished difference Result 705 states and 711 transitions. [2018-12-03 17:00:50,594 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 261 states. [2018-12-03 17:00:50,594 INFO L78 Accepts]: Start accepts. Automaton has 155 states. Word has length 261 [2018-12-03 17:00:50,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:00:50,596 INFO L225 Difference]: With dead ends: 705 [2018-12-03 17:00:50,597 INFO L226 Difference]: Without dead ends: 410 [2018-12-03 17:00:50,602 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 819 GetRequests, 367 SyntacticMatches, 38 SemanticMatches, 414 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37575 ImplicationChecksByTransitivity, 55.5s TimeCoverageRelationStatistics Valid=11795, Invalid=160845, Unknown=0, NotChecked=0, Total=172640 [2018-12-03 17:00:50,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2018-12-03 17:00:50,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 269. [2018-12-03 17:00:50,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2018-12-03 17:00:50,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 271 transitions. [2018-12-03 17:00:50,696 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 271 transitions. Word has length 261 [2018-12-03 17:00:50,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:00:50,696 INFO L480 AbstractCegarLoop]: Abstraction has 269 states and 271 transitions. [2018-12-03 17:00:50,696 INFO L481 AbstractCegarLoop]: Interpolant automaton has 155 states. [2018-12-03 17:00:50,696 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 271 transitions. [2018-12-03 17:00:50,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2018-12-03 17:00:50,697 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:00:50,697 INFO L402 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 37, 37, 37, 1, 1, 1, 1, 1] [2018-12-03 17:00:50,698 INFO L423 AbstractCegarLoop]: === Iteration 67 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:00:50,698 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:00:50,698 INFO L82 PathProgramCache]: Analyzing trace with hash 1569385749, now seen corresponding path program 63 times [2018-12-03 17:00:50,698 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:00:50,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:00:50,699 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:00:50,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:00:50,699 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:00:50,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:00:54,254 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 37 proven. 4885 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:00:54,255 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:00:54,255 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:00:54,255 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:00:54,255 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:00:54,255 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:00:54,255 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 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:00:54,264 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:00:54,264 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:00:54,306 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:00:54,306 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:00:54,311 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:00:57,809 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 37 proven. 4885 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:00:57,809 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:00:58,117 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 37 proven. 4885 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:00:58,137 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:00:58,137 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 78, 78] total 118 [2018-12-03 17:00:58,138 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:00:58,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2018-12-03 17:00:58,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2018-12-03 17:00:58,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=13728, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 17:00:58,139 INFO L87 Difference]: Start difference. First operand 269 states and 271 transitions. Second operand 119 states. [2018-12-03 17:01:14,375 WARN L180 SmtUtils]: Spent 309.00 ms on a formula simplification that was a NOOP. DAG size: 193 [2018-12-03 17:01:15,119 WARN L180 SmtUtils]: Spent 253.00 ms on a formula simplification that was a NOOP. DAG size: 193 [2018-12-03 17:01:15,760 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 188 [2018-12-03 17:01:16,204 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2018-12-03 17:01:16,641 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 179 [2018-12-03 17:01:17,060 WARN L180 SmtUtils]: Spent 218.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2018-12-03 17:01:17,477 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-03 17:01:17,901 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-03 17:01:18,301 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 17:01:18,696 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 17:01:19,078 WARN L180 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 17:01:19,531 WARN L180 SmtUtils]: Spent 256.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 17:01:19,896 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 17:01:20,262 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 17:01:20,602 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 17:01:20,937 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 17:01:21,262 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 17:01:21,573 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 17:01:21,869 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 17:01:22,155 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 17:01:25,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:01:25,739 INFO L93 Difference]: Finished difference Result 574 states and 579 transitions. [2018-12-03 17:01:25,739 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2018-12-03 17:01:25,739 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 268 [2018-12-03 17:01:25,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:01:25,741 INFO L225 Difference]: With dead ends: 574 [2018-12-03 17:01:25,741 INFO L226 Difference]: Without dead ends: 424 [2018-12-03 17:01:25,742 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 689 GetRequests, 493 SyntacticMatches, 3 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6014 ImplicationChecksByTransitivity, 20.0s TimeCoverageRelationStatistics Valid=2101, Invalid=35729, Unknown=0, NotChecked=0, Total=37830 [2018-12-03 17:01:25,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2018-12-03 17:01:25,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 273. [2018-12-03 17:01:25,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 273 states. [2018-12-03 17:01:25,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 275 transitions. [2018-12-03 17:01:25,827 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 275 transitions. Word has length 268 [2018-12-03 17:01:25,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:01:25,827 INFO L480 AbstractCegarLoop]: Abstraction has 273 states and 275 transitions. [2018-12-03 17:01:25,827 INFO L481 AbstractCegarLoop]: Interpolant automaton has 119 states. [2018-12-03 17:01:25,827 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 275 transitions. [2018-12-03 17:01:25,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2018-12-03 17:01:25,828 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:01:25,829 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1] [2018-12-03 17:01:25,829 INFO L423 AbstractCegarLoop]: === Iteration 68 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:01:25,829 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:01:25,829 INFO L82 PathProgramCache]: Analyzing trace with hash 107131324, now seen corresponding path program 64 times [2018-12-03 17:01:25,829 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:01:25,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:01:25,830 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:01:25,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:01:25,830 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:01:25,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:01:27,810 INFO L134 CoverageAnalysis]: Checked inductivity of 5073 backedges. 2926 proven. 2147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:01:27,810 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:01:27,810 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:01:27,811 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:01:27,811 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:01:27,811 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:01:27,811 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 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:01:27,819 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:01:27,819 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:01:27,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:01:27,873 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:01:30,610 INFO L134 CoverageAnalysis]: Checked inductivity of 5073 backedges. 2926 proven. 2147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:01:30,611 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:01:32,467 INFO L134 CoverageAnalysis]: Checked inductivity of 5073 backedges. 2926 proven. 2147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:01:32,486 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:01:32,487 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 118 [2018-12-03 17:01:32,487 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:01:32,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2018-12-03 17:01:32,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2018-12-03 17:01:32,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3238, Invalid=10804, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 17:01:32,488 INFO L87 Difference]: Start difference. First operand 273 states and 275 transitions. Second operand 119 states. [2018-12-03 17:01:35,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:01:35,895 INFO L93 Difference]: Finished difference Result 585 states and 589 transitions. [2018-12-03 17:01:35,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-12-03 17:01:35,895 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 272 [2018-12-03 17:01:35,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:01:35,896 INFO L225 Difference]: With dead ends: 585 [2018-12-03 17:01:35,896 INFO L226 Difference]: Without dead ends: 278 [2018-12-03 17:01:35,897 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 660 GetRequests, 427 SyntacticMatches, 77 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8816 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=5656, Invalid=19150, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 17:01:35,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2018-12-03 17:01:35,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 276. [2018-12-03 17:01:35,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 276 states. [2018-12-03 17:01:35,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 278 transitions. [2018-12-03 17:01:35,980 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 278 transitions. Word has length 272 [2018-12-03 17:01:35,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:01:35,980 INFO L480 AbstractCegarLoop]: Abstraction has 276 states and 278 transitions. [2018-12-03 17:01:35,980 INFO L481 AbstractCegarLoop]: Interpolant automaton has 119 states. [2018-12-03 17:01:35,980 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 278 transitions. [2018-12-03 17:01:35,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-12-03 17:01:35,981 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:01:35,982 INFO L402 BasicCegarLoop]: trace histogram [39, 39, 39, 39, 38, 38, 38, 1, 1, 1, 1, 1] [2018-12-03 17:01:35,982 INFO L423 AbstractCegarLoop]: === Iteration 69 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:01:35,982 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:01:35,982 INFO L82 PathProgramCache]: Analyzing trace with hash 1761642804, now seen corresponding path program 65 times [2018-12-03 17:01:35,982 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:01:35,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:01:35,983 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:01:35,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:01:35,983 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:01:35,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:01:39,409 INFO L134 CoverageAnalysis]: Checked inductivity of 5188 backedges. 38 proven. 5150 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 17:01:39,409 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:01:39,409 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:01:39,409 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:01:39,409 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:01:39,409 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:01:39,409 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 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 17:01:39,417 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:01:39,417 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:01:39,510 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-12-03 17:01:39,510 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:01:39,515 INFO L273 TraceCheckSpWp]: Computing forward predicates...