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_oct.epf -i ../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/HiddenEqualityWithBranches.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 19:27:10,928 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 19:27:10,930 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 19:27:10,949 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 19:27:10,949 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 19:27:10,950 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 19:27:10,951 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 19:27:10,953 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 19:27:10,955 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 19:27:10,956 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 19:27:10,957 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-12-03 19:27:10,981 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf [2018-12-03 19:27:11,002 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 19:27:11,003 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 19:27:11,004 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 19:27:11,004 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 19:27:11,004 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 19:27:11,004 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 19:27:11,004 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 19:27:11,005 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 19:27:11,005 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 19:27:11,005 INFO L133 SettingsManager]: * Underlying domain=OctagonDomain [2018-12-03 19:27:11,005 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 19:27:11,005 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 19:27:11,005 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 19:27:11,009 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 19:27:11,009 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 19:27:11,010 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 19:27:11,011 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 19:27:11,011 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 19:27:11,011 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 19:27:11,011 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 19:27:11,011 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 19:27:11,012 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 19:27:11,012 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 19:27:11,012 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 19:27:11,012 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 19:27:11,012 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 19:27:11,015 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 19:27:11,015 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 19:27:11,015 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 19:27:11,016 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 19:27:11,016 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 19:27:11,016 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 19:27:11,016 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 19:27:11,016 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 19:27:11,017 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 19:27:11,017 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 19:27:11,017 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 19:27:11,018 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 19:27:11,018 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 19:27:11,018 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 19:27:11,056 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 19:27:11,068 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 19:27:11,071 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 19:27:11,072 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 19:27:11,073 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 19:27:11,074 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/HiddenEqualityWithBranches.bpl [2018-12-03 19:27:11,074 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/HiddenEqualityWithBranches.bpl' [2018-12-03 19:27:11,105 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 19:27:11,107 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 19:27:11,108 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 19:27:11,108 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 19:27:11,108 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 19:27:11,125 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:27:11" (1/1) ... [2018-12-03 19:27:11,134 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:27:11" (1/1) ... [2018-12-03 19:27:11,140 WARN L165 Inliner]: Program contained no entry procedure! [2018-12-03 19:27:11,140 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2018-12-03 19:27:11,141 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2018-12-03 19:27:11,143 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 19:27:11,144 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 19:27:11,144 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 19:27:11,144 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 19:27:11,155 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:27:11" (1/1) ... [2018-12-03 19:27:11,156 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:27:11" (1/1) ... [2018-12-03 19:27:11,156 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:27:11" (1/1) ... [2018-12-03 19:27:11,156 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:27:11" (1/1) ... [2018-12-03 19:27:11,159 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:27:11" (1/1) ... [2018-12-03 19:27:11,163 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:27:11" (1/1) ... [2018-12-03 19:27:11,164 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:27:11" (1/1) ... [2018-12-03 19:27:11,165 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 19:27:11,166 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 19:27:11,166 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 19:27:11,166 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 19:27:11,167 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:27:11" (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 19:27:11,228 INFO L124 BoogieDeclarations]: Specification and implementation of procedure main given in one single declaration [2018-12-03 19:27:11,228 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-03 19:27:11,229 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-03 19:27:11,453 INFO L272 CfgBuilder]: Using library mode [2018-12-03 19:27:11,453 INFO L280 CfgBuilder]: Removed 1 assue(true) statements. [2018-12-03 19:27:11,454 INFO L202 PluginConnector]: Adding new model HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 07:27:11 BoogieIcfgContainer [2018-12-03 19:27:11,454 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 19:27:11,456 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 19:27:11,456 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 19:27:11,459 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 19:27:11,460 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:27:11" (1/2) ... [2018-12-03 19:27:11,461 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51b8d2c5 and model type HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 07:27:11, skipping insertion in model container [2018-12-03 19:27:11,461 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "HiddenEqualityWithBranches.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 07:27:11" (2/2) ... [2018-12-03 19:27:11,463 INFO L112 eAbstractionObserver]: Analyzing ICFG HiddenEqualityWithBranches.bpl [2018-12-03 19:27:11,473 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 19:27:11,480 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 19:27:11,498 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 19:27:11,530 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 19:27:11,530 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 19:27:11,530 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 19:27:11,531 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 19:27:11,531 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 19:27:11,531 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 19:27:11,531 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 19:27:11,531 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 19:27:11,546 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-12-03 19:27:11,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2018-12-03 19:27:11,553 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:11,554 INFO L402 BasicCegarLoop]: trace histogram [1, 1] [2018-12-03 19:27:11,557 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:11,562 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:11,562 INFO L82 PathProgramCache]: Analyzing trace with hash 978, now seen corresponding path program 1 times [2018-12-03 19:27:11,564 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:11,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:11,614 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:11,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:11,614 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:11,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:11,716 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 19:27:11,718 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 19:27:11,718 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2018-12-03 19:27:11,718 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 19:27:11,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 19:27:11,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 19:27:11,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 19:27:11,739 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-12-03 19:27:11,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:11,814 INFO L93 Difference]: Finished difference Result 14 states and 20 transitions. [2018-12-03 19:27:11,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 19:27:11,817 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 2 [2018-12-03 19:27:11,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:11,845 INFO L225 Difference]: With dead ends: 14 [2018-12-03 19:27:11,845 INFO L226 Difference]: Without dead ends: 5 [2018-12-03 19:27:11,851 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 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 19:27:11,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states. [2018-12-03 19:27:11,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2018-12-03 19:27:11,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2018-12-03 19:27:11,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 7 transitions. [2018-12-03 19:27:11,898 INFO L78 Accepts]: Start accepts. Automaton has 5 states and 7 transitions. Word has length 2 [2018-12-03 19:27:11,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:11,899 INFO L480 AbstractCegarLoop]: Abstraction has 5 states and 7 transitions. [2018-12-03 19:27:11,899 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 19:27:11,899 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 7 transitions. [2018-12-03 19:27:11,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-03 19:27:11,900 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:11,900 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-12-03 19:27:11,901 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:11,901 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:11,901 INFO L82 PathProgramCache]: Analyzing trace with hash 931598, now seen corresponding path program 1 times [2018-12-03 19:27:11,901 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:11,903 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:11,903 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:11,903 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:11,903 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:11,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:11,970 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 19:27:11,970 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 19:27:11,970 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-03 19:27:11,971 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 19:27:11,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 19:27:11,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 19:27:11,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 19:27:11,973 INFO L87 Difference]: Start difference. First operand 5 states and 7 transitions. Second operand 3 states. [2018-12-03 19:27:12,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:12,027 INFO L93 Difference]: Finished difference Result 9 states and 14 transitions. [2018-12-03 19:27:12,028 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 19:27:12,028 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-12-03 19:27:12,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:12,029 INFO L225 Difference]: With dead ends: 9 [2018-12-03 19:27:12,029 INFO L226 Difference]: Without dead ends: 6 [2018-12-03 19:27:12,030 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 19:27:12,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2018-12-03 19:27:12,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2018-12-03 19:27:12,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2018-12-03 19:27:12,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 8 transitions. [2018-12-03 19:27:12,033 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 8 transitions. Word has length 4 [2018-12-03 19:27:12,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:12,033 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 8 transitions. [2018-12-03 19:27:12,033 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 19:27:12,033 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 8 transitions. [2018-12-03 19:27:12,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-03 19:27:12,034 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:12,034 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-12-03 19:27:12,034 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:12,035 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:12,035 INFO L82 PathProgramCache]: Analyzing trace with hash 931660, now seen corresponding path program 1 times [2018-12-03 19:27:12,035 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:12,036 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:12,036 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:12,036 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:12,036 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:12,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:12,126 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 19:27:12,126 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:12,127 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:12,128 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 5 with the following transitions: [2018-12-03 19:27:12,129 INFO L205 CegarAbsIntRunner]: [0], [8], [14], [17] [2018-12-03 19:27:12,191 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 19:27:12,192 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 19:27:12,464 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-12-03 19:27:12,467 INFO L272 AbstractInterpreter]: Visited 4 different actions 28 times. Merged at 2 different actions 16 times. Widened at 1 different actions 4 times. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 19:27:12,511 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:12,511 INFO L401 sIntCurrentIteration]: Generating AbsInt predicates [2018-12-03 19:27:12,558 INFO L219 lantSequenceWeakener]: Could never weaken! [2018-12-03 19:27:12,558 INFO L416 sIntCurrentIteration]: Unifying AI predicates [2018-12-03 19:27:12,595 INFO L418 sIntCurrentIteration]: We unified 3 AI predicates to 3 [2018-12-03 19:27:12,595 INFO L427 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-12-03 19:27:12,596 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-12-03 19:27:12,596 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [2] total 4 [2018-12-03 19:27:12,597 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 19:27:12,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 19:27:12,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 19:27:12,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-03 19:27:12,598 INFO L87 Difference]: Start difference. First operand 6 states and 8 transitions. Second operand 4 states. [2018-12-03 19:27:12,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:12,759 INFO L93 Difference]: Finished difference Result 11 states and 18 transitions. [2018-12-03 19:27:12,759 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 19:27:12,759 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2018-12-03 19:27:12,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:12,759 INFO L225 Difference]: With dead ends: 11 [2018-12-03 19:27:12,760 INFO L226 Difference]: Without dead ends: 8 [2018-12-03 19:27:12,760 INFO L631 BasicCegarLoop]: 2 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-03 19:27:12,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-12-03 19:27:12,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 7. [2018-12-03 19:27:12,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 19:27:12,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 10 transitions. [2018-12-03 19:27:12,764 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 10 transitions. Word has length 4 [2018-12-03 19:27:12,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:12,764 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 10 transitions. [2018-12-03 19:27:12,765 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 19:27:12,765 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 10 transitions. [2018-12-03 19:27:12,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 19:27:12,765 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:12,765 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-12-03 19:27:12,766 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:12,766 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:12,766 INFO L82 PathProgramCache]: Analyzing trace with hash 895315078, now seen corresponding path program 1 times [2018-12-03 19:27:12,766 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:12,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:12,767 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:12,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:12,768 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:12,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:12,814 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 19:27:12,814 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:12,814 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:12,814 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 7 with the following transitions: [2018-12-03 19:27:12,815 INFO L205 CegarAbsIntRunner]: [0], [6], [8], [12], [14], [17] [2018-12-03 19:27:12,816 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 19:27:12,816 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 19:27:12,904 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 19:27:12,904 INFO L272 AbstractInterpreter]: Visited 6 different actions 66 times. Merged at 5 different actions 25 times. Widened at 2 different actions 8 times. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 19:27:12,920 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:12,921 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 19:27:12,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:12,922 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:27:12,936 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:12,936 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:12,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:12,961 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:12,979 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 19:27:12,979 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:13,036 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 19:27:13,055 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:13,055 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2018-12-03 19:27:13,056 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:13,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 19:27:13,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 19:27:13,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-12-03 19:27:13,057 INFO L87 Difference]: Start difference. First operand 7 states and 10 transitions. Second operand 4 states. [2018-12-03 19:27:13,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:13,121 INFO L93 Difference]: Finished difference Result 12 states and 18 transitions. [2018-12-03 19:27:13,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 19:27:13,122 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-12-03 19:27:13,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:13,122 INFO L225 Difference]: With dead ends: 12 [2018-12-03 19:27:13,123 INFO L226 Difference]: Without dead ends: 9 [2018-12-03 19:27:13,123 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-12-03 19:27:13,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-12-03 19:27:13,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-12-03 19:27:13,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-12-03 19:27:13,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 12 transitions. [2018-12-03 19:27:13,128 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 12 transitions. Word has length 6 [2018-12-03 19:27:13,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:13,129 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 12 transitions. [2018-12-03 19:27:13,129 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 19:27:13,129 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 12 transitions. [2018-12-03 19:27:13,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-03 19:27:13,130 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:13,130 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1] [2018-12-03 19:27:13,130 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:13,131 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:13,131 INFO L82 PathProgramCache]: Analyzing trace with hash 1406227200, now seen corresponding path program 2 times [2018-12-03 19:27:13,131 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:13,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:13,132 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:13,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:13,133 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:13,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:13,256 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:13,257 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:13,257 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:13,257 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:13,258 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:13,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:13,258 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 19:27:13,275 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:13,275 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:13,299 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 19:27:13,300 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:13,301 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:13,335 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:13,336 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:13,575 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:27:13,593 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:13,594 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 10 [2018-12-03 19:27:13,594 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:13,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 19:27:13,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 19:27:13,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-03 19:27:13,595 INFO L87 Difference]: Start difference. First operand 9 states and 12 transitions. Second operand 7 states. [2018-12-03 19:27:13,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:13,668 INFO L93 Difference]: Finished difference Result 18 states and 30 transitions. [2018-12-03 19:27:13,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 19:27:13,668 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 8 [2018-12-03 19:27:13,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:13,669 INFO L225 Difference]: With dead ends: 18 [2018-12-03 19:27:13,669 INFO L226 Difference]: Without dead ends: 15 [2018-12-03 19:27:13,669 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-03 19:27:13,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-12-03 19:27:13,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-12-03 19:27:13,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-03 19:27:13,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 20 transitions. [2018-12-03 19:27:13,676 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 20 transitions. Word has length 8 [2018-12-03 19:27:13,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:13,676 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 20 transitions. [2018-12-03 19:27:13,676 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 19:27:13,677 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 20 transitions. [2018-12-03 19:27:13,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-03 19:27:13,677 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:13,677 INFO L402 BasicCegarLoop]: trace histogram [5, 3, 3, 1, 1, 1] [2018-12-03 19:27:13,678 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:13,678 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:13,678 INFO L82 PathProgramCache]: Analyzing trace with hash -543279502, now seen corresponding path program 3 times [2018-12-03 19:27:13,678 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:13,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:13,679 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:13,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:13,680 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:13,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:13,746 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:13,747 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:13,747 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:13,747 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:13,747 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:13,747 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:13,747 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 19:27:13,760 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:27:13,760 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:27:13,772 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:27:13,772 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:13,773 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:13,779 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:13,780 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:13,959 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:13,978 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:13,978 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-12-03 19:27:13,978 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:13,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-03 19:27:13,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-03 19:27:13,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-03 19:27:13,980 INFO L87 Difference]: Start difference. First operand 15 states and 20 transitions. Second operand 6 states. [2018-12-03 19:27:14,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:14,008 INFO L93 Difference]: Finished difference Result 24 states and 34 transitions. [2018-12-03 19:27:14,008 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 19:27:14,008 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2018-12-03 19:27:14,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:14,009 INFO L225 Difference]: With dead ends: 24 [2018-12-03 19:27:14,009 INFO L226 Difference]: Without dead ends: 17 [2018-12-03 19:27:14,010 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-03 19:27:14,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-12-03 19:27:14,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-12-03 19:27:14,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-12-03 19:27:14,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 22 transitions. [2018-12-03 19:27:14,015 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 22 transitions. Word has length 14 [2018-12-03 19:27:14,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:14,016 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 22 transitions. [2018-12-03 19:27:14,016 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-03 19:27:14,016 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 22 transitions. [2018-12-03 19:27:14,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 19:27:14,017 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:14,017 INFO L402 BasicCegarLoop]: trace histogram [6, 4, 3, 1, 1, 1] [2018-12-03 19:27:14,017 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:14,017 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:14,018 INFO L82 PathProgramCache]: Analyzing trace with hash -9895188, now seen corresponding path program 4 times [2018-12-03 19:27:14,018 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:14,019 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:14,019 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:14,019 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:14,019 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:14,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:14,112 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 27 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:14,113 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:14,113 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:14,113 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:14,113 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:14,113 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:14,113 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:27:14,123 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:14,123 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:14,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:14,135 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:14,140 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 27 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:14,140 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:14,561 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 27 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:14,586 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:14,586 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2018-12-03 19:27:14,586 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:14,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 19:27:14,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 19:27:14,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-12-03 19:27:14,587 INFO L87 Difference]: Start difference. First operand 17 states and 22 transitions. Second operand 7 states. [2018-12-03 19:27:14,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:14,623 INFO L93 Difference]: Finished difference Result 26 states and 36 transitions. [2018-12-03 19:27:14,623 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 19:27:14,623 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2018-12-03 19:27:14,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:14,624 INFO L225 Difference]: With dead ends: 26 [2018-12-03 19:27:14,624 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 19:27:14,624 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-12-03 19:27:14,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 19:27:14,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-12-03 19:27:14,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 19:27:14,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2018-12-03 19:27:14,629 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 16 [2018-12-03 19:27:14,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:14,629 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2018-12-03 19:27:14,629 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 19:27:14,629 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2018-12-03 19:27:14,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 19:27:14,630 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:14,630 INFO L402 BasicCegarLoop]: trace histogram [7, 5, 3, 1, 1, 1] [2018-12-03 19:27:14,630 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:14,631 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:14,631 INFO L82 PathProgramCache]: Analyzing trace with hash 1471322342, now seen corresponding path program 5 times [2018-12-03 19:27:14,631 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:14,632 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:14,632 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:14,632 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:14,632 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:14,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:14,805 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 33 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:14,805 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:14,806 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:14,806 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:14,806 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:14,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:14,806 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 19:27:14,821 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:14,822 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:14,879 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-12-03 19:27:14,879 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:14,881 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:15,035 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 44 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2018-12-03 19:27:15,036 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:15,075 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 44 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2018-12-03 19:27:15,094 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-12-03 19:27:15,095 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [7] total 14 [2018-12-03 19:27:15,095 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 19:27:15,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 19:27:15,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 19:27:15,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2018-12-03 19:27:15,096 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand 5 states. [2018-12-03 19:27:15,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:15,117 INFO L93 Difference]: Finished difference Result 33 states and 46 transitions. [2018-12-03 19:27:15,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 19:27:15,121 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2018-12-03 19:27:15,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:15,122 INFO L225 Difference]: With dead ends: 33 [2018-12-03 19:27:15,122 INFO L226 Difference]: Without dead ends: 26 [2018-12-03 19:27:15,123 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2018-12-03 19:27:15,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-12-03 19:27:15,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2018-12-03 19:27:15,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-03 19:27:15,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2018-12-03 19:27:15,131 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 18 [2018-12-03 19:27:15,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:15,131 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2018-12-03 19:27:15,131 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 19:27:15,131 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2018-12-03 19:27:15,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 19:27:15,132 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:15,132 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 2, 1, 1, 1] [2018-12-03 19:27:15,133 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:15,133 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:15,133 INFO L82 PathProgramCache]: Analyzing trace with hash 1471381924, now seen corresponding path program 6 times [2018-12-03 19:27:15,133 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:15,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:15,134 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:15,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:15,135 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:15,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:15,227 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 33 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:15,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:15,227 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:15,228 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:15,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:15,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:15,228 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:27:15,239 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:27:15,239 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:27:15,251 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:27:15,251 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:15,253 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:15,259 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 33 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:15,259 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:15,540 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 33 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:15,566 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:15,566 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-12-03 19:27:15,567 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:15,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 19:27:15,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 19:27:15,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-12-03 19:27:15,568 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand 8 states. [2018-12-03 19:27:15,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:15,602 INFO L93 Difference]: Finished difference Result 40 states and 54 transitions. [2018-12-03 19:27:15,602 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 19:27:15,602 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2018-12-03 19:27:15,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:15,603 INFO L225 Difference]: With dead ends: 40 [2018-12-03 19:27:15,603 INFO L226 Difference]: Without dead ends: 27 [2018-12-03 19:27:15,603 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-12-03 19:27:15,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-12-03 19:27:15,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-12-03 19:27:15,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-03 19:27:15,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2018-12-03 19:27:15,608 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 18 [2018-12-03 19:27:15,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:15,609 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2018-12-03 19:27:15,609 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 19:27:15,609 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2018-12-03 19:27:15,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 19:27:15,610 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:15,610 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 2, 1, 1, 1] [2018-12-03 19:27:15,610 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:15,610 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:15,610 INFO L82 PathProgramCache]: Analyzing trace with hash -1007714018, now seen corresponding path program 7 times [2018-12-03 19:27:15,611 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:15,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:15,611 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:15,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:15,612 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:15,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:15,758 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 39 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:15,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:15,759 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:15,759 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:15,759 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:15,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:15,759 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 19:27:15,769 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:15,769 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:15,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:15,781 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:15,786 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 39 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:15,786 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:15,953 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 39 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:15,971 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:15,971 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-12-03 19:27:15,972 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:15,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-03 19:27:15,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-03 19:27:15,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-12-03 19:27:15,973 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand 9 states. [2018-12-03 19:27:16,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:16,025 INFO L93 Difference]: Finished difference Result 42 states and 56 transitions. [2018-12-03 19:27:16,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 19:27:16,029 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 20 [2018-12-03 19:27:16,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:16,030 INFO L225 Difference]: With dead ends: 42 [2018-12-03 19:27:16,030 INFO L226 Difference]: Without dead ends: 29 [2018-12-03 19:27:16,031 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-12-03 19:27:16,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-12-03 19:27:16,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-12-03 19:27:16,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-12-03 19:27:16,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2018-12-03 19:27:16,036 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 20 [2018-12-03 19:27:16,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:16,036 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2018-12-03 19:27:16,036 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-03 19:27:16,036 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2018-12-03 19:27:16,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-12-03 19:27:16,037 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:16,037 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 2, 1, 1, 1] [2018-12-03 19:27:16,038 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:16,038 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:16,038 INFO L82 PathProgramCache]: Analyzing trace with hash 287935000, now seen corresponding path program 8 times [2018-12-03 19:27:16,038 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:16,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:16,039 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:16,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:16,039 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:16,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:16,143 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 45 proven. 49 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:16,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:16,143 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:16,143 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:16,143 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:16,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:16,144 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 19:27:16,153 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:16,153 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:16,185 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-12-03 19:27:16,185 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:16,187 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:16,241 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 56 proven. 2 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-12-03 19:27:16,241 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:16,352 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 56 proven. 2 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-12-03 19:27:16,378 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:16,379 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5, 5] total 16 [2018-12-03 19:27:16,379 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:16,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 19:27:16,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 19:27:16,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2018-12-03 19:27:16,380 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand 13 states. [2018-12-03 19:27:16,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:16,629 INFO L93 Difference]: Finished difference Result 52 states and 69 transitions. [2018-12-03 19:27:16,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 19:27:16,630 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 22 [2018-12-03 19:27:16,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:16,631 INFO L225 Difference]: With dead ends: 52 [2018-12-03 19:27:16,631 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 19:27:16,632 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=220, Invalid=430, Unknown=0, NotChecked=0, Total=650 [2018-12-03 19:27:16,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 19:27:16,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2018-12-03 19:27:16,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-03 19:27:16,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2018-12-03 19:27:16,638 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 22 [2018-12-03 19:27:16,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:16,639 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2018-12-03 19:27:16,639 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 19:27:16,639 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2018-12-03 19:27:16,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 19:27:16,640 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:16,640 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1] [2018-12-03 19:27:16,640 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:16,640 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:16,640 INFO L82 PathProgramCache]: Analyzing trace with hash -133874480, now seen corresponding path program 9 times [2018-12-03 19:27:16,640 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:16,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:16,641 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:16,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:16,642 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:16,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:16,757 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 51 proven. 64 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:16,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:16,758 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:16,758 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:16,758 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:16,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:16,759 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 19:27:16,768 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:27:16,768 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:27:16,809 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:27:16,809 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:16,811 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:16,819 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 51 proven. 64 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:16,819 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:17,078 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 51 proven. 64 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:17,098 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:17,098 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-12-03 19:27:17,098 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:17,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 19:27:17,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 19:27:17,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-12-03 19:27:17,100 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 11 states. [2018-12-03 19:27:17,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:17,211 INFO L93 Difference]: Finished difference Result 58 states and 76 transitions. [2018-12-03 19:27:17,212 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 19:27:17,212 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 24 [2018-12-03 19:27:17,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:17,213 INFO L225 Difference]: With dead ends: 58 [2018-12-03 19:27:17,213 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 19:27:17,213 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-12-03 19:27:17,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 19:27:17,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-12-03 19:27:17,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-03 19:27:17,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 48 transitions. [2018-12-03 19:27:17,221 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 48 transitions. Word has length 24 [2018-12-03 19:27:17,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:17,221 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 48 transitions. [2018-12-03 19:27:17,221 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 19:27:17,222 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 48 transitions. [2018-12-03 19:27:17,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-03 19:27:17,223 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:17,223 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1] [2018-12-03 19:27:17,223 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:17,223 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:17,223 INFO L82 PathProgramCache]: Analyzing trace with hash -1765918518, now seen corresponding path program 10 times [2018-12-03 19:27:17,224 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:17,224 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:17,225 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:17,225 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:17,225 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:17,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:17,380 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 57 proven. 81 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:17,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:17,381 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:17,381 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:17,381 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:17,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:17,381 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 19:27:17,396 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:17,396 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:17,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:17,419 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:17,434 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 57 proven. 81 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:17,434 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:17,711 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 57 proven. 81 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:17,730 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:17,730 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-12-03 19:27:17,730 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:17,731 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 19:27:17,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 19:27:17,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-12-03 19:27:17,732 INFO L87 Difference]: Start difference. First operand 39 states and 48 transitions. Second operand 12 states. [2018-12-03 19:27:17,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:17,793 INFO L93 Difference]: Finished difference Result 60 states and 78 transitions. [2018-12-03 19:27:17,799 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 19:27:17,799 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 26 [2018-12-03 19:27:17,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:17,800 INFO L225 Difference]: With dead ends: 60 [2018-12-03 19:27:17,800 INFO L226 Difference]: Without dead ends: 41 [2018-12-03 19:27:17,801 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-12-03 19:27:17,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-12-03 19:27:17,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-12-03 19:27:17,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-12-03 19:27:17,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 50 transitions. [2018-12-03 19:27:17,807 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 50 transitions. Word has length 26 [2018-12-03 19:27:17,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:17,808 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 50 transitions. [2018-12-03 19:27:17,808 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 19:27:17,808 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 50 transitions. [2018-12-03 19:27:17,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-12-03 19:27:17,809 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:17,809 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1] [2018-12-03 19:27:17,809 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:17,810 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:17,810 INFO L82 PathProgramCache]: Analyzing trace with hash 1797791300, now seen corresponding path program 11 times [2018-12-03 19:27:17,810 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:17,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:17,811 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:17,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:17,811 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:17,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:17,996 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 63 proven. 100 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:27:17,996 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:17,997 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:17,997 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:17,997 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:17,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:17,998 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 19:27:18,008 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:18,008 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:18,024 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-03 19:27:18,024 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:18,026 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:18,078 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 82 proven. 6 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2018-12-03 19:27:18,078 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:18,411 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 82 proven. 6 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2018-12-03 19:27:18,430 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:18,430 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 5, 5] total 18 [2018-12-03 19:27:18,430 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:18,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 19:27:18,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 19:27:18,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-12-03 19:27:18,431 INFO L87 Difference]: Start difference. First operand 41 states and 50 transitions. Second operand 14 states. [2018-12-03 19:27:18,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:18,599 INFO L93 Difference]: Finished difference Result 110 states and 184 transitions. [2018-12-03 19:27:18,601 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 19:27:18,601 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 28 [2018-12-03 19:27:18,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:18,602 INFO L225 Difference]: With dead ends: 110 [2018-12-03 19:27:18,602 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 19:27:18,603 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-12-03 19:27:18,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 19:27:18,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-12-03 19:27:18,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-12-03 19:27:18,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 108 transitions. [2018-12-03 19:27:18,614 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 108 transitions. Word has length 28 [2018-12-03 19:27:18,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:18,615 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 108 transitions. [2018-12-03 19:27:18,615 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 19:27:18,615 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 108 transitions. [2018-12-03 19:27:18,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-12-03 19:27:18,617 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:18,617 INFO L402 BasicCegarLoop]: trace histogram [21, 18, 4, 1, 1, 1] [2018-12-03 19:27:18,617 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:18,617 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:18,617 INFO L82 PathProgramCache]: Analyzing trace with hash -1185393580, now seen corresponding path program 12 times [2018-12-03 19:27:18,618 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:18,618 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:18,619 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:18,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:18,619 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:18,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:18,842 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 253 proven. 121 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:18,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:18,842 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:18,842 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:18,842 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:18,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:18,843 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 19:27:18,851 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:27:18,851 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:27:18,889 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:27:18,889 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:18,893 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:18,904 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 253 proven. 121 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:18,904 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:19,243 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 253 proven. 121 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:19,262 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:19,262 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-12-03 19:27:19,262 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:19,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 19:27:19,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 19:27:19,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-12-03 19:27:19,264 INFO L87 Difference]: Start difference. First operand 91 states and 108 transitions. Second operand 14 states. [2018-12-03 19:27:19,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:19,336 INFO L93 Difference]: Finished difference Result 160 states and 194 transitions. [2018-12-03 19:27:19,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 19:27:19,337 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 46 [2018-12-03 19:27:19,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:19,338 INFO L225 Difference]: With dead ends: 160 [2018-12-03 19:27:19,338 INFO L226 Difference]: Without dead ends: 93 [2018-12-03 19:27:19,339 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-12-03 19:27:19,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-12-03 19:27:19,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-12-03 19:27:19,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-12-03 19:27:19,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 110 transitions. [2018-12-03 19:27:19,350 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 110 transitions. Word has length 46 [2018-12-03 19:27:19,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:19,351 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 110 transitions. [2018-12-03 19:27:19,351 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 19:27:19,351 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 110 transitions. [2018-12-03 19:27:19,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 19:27:19,352 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:19,353 INFO L402 BasicCegarLoop]: trace histogram [22, 19, 4, 1, 1, 1] [2018-12-03 19:27:19,353 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:19,353 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:19,353 INFO L82 PathProgramCache]: Analyzing trace with hash 331528398, now seen corresponding path program 13 times [2018-12-03 19:27:19,353 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:19,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:19,354 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:19,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:19,355 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:19,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:19,692 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 275 proven. 144 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:19,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:19,693 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:19,693 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:19,693 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:19,693 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:19,693 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 19:27:19,704 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:19,704 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:19,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:19,743 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:19,757 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 275 proven. 144 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:19,758 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:20,196 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 275 proven. 144 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:20,215 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:20,215 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-12-03 19:27:20,215 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:20,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 19:27:20,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 19:27:20,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-12-03 19:27:20,216 INFO L87 Difference]: Start difference. First operand 93 states and 110 transitions. Second operand 15 states. [2018-12-03 19:27:20,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:20,277 INFO L93 Difference]: Finished difference Result 162 states and 196 transitions. [2018-12-03 19:27:20,278 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 19:27:20,278 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 48 [2018-12-03 19:27:20,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:20,279 INFO L225 Difference]: With dead ends: 162 [2018-12-03 19:27:20,279 INFO L226 Difference]: Without dead ends: 95 [2018-12-03 19:27:20,281 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-12-03 19:27:20,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-12-03 19:27:20,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2018-12-03 19:27:20,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-12-03 19:27:20,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 112 transitions. [2018-12-03 19:27:20,292 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 112 transitions. Word has length 48 [2018-12-03 19:27:20,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:20,293 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 112 transitions. [2018-12-03 19:27:20,293 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 19:27:20,293 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 112 transitions. [2018-12-03 19:27:20,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-12-03 19:27:20,294 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:20,295 INFO L402 BasicCegarLoop]: trace histogram [23, 20, 4, 1, 1, 1] [2018-12-03 19:27:20,295 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:20,295 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:20,295 INFO L82 PathProgramCache]: Analyzing trace with hash 2099635912, now seen corresponding path program 14 times [2018-12-03 19:27:20,295 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:20,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:20,296 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:20,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:20,297 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:20,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:20,522 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 297 proven. 169 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:20,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:20,522 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:20,522 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:20,523 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:20,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:20,523 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 19:27:20,537 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:20,537 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:20,666 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-03 19:27:20,666 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:20,669 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:20,823 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 227 proven. 6 refuted. 0 times theorem prover too weak. 343 trivial. 0 not checked. [2018-12-03 19:27:20,824 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:20,916 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 227 proven. 6 refuted. 0 times theorem prover too weak. 343 trivial. 0 not checked. [2018-12-03 19:27:20,935 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:20,935 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 6, 6] total 24 [2018-12-03 19:27:20,935 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:20,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 19:27:20,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 19:27:20,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=388, Unknown=0, NotChecked=0, Total=552 [2018-12-03 19:27:20,937 INFO L87 Difference]: Start difference. First operand 95 states and 112 transitions. Second operand 20 states. [2018-12-03 19:27:21,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:21,374 INFO L93 Difference]: Finished difference Result 189 states and 233 transitions. [2018-12-03 19:27:21,374 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 19:27:21,374 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 50 [2018-12-03 19:27:21,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:21,376 INFO L225 Difference]: With dead ends: 189 [2018-12-03 19:27:21,376 INFO L226 Difference]: Without dead ends: 122 [2018-12-03 19:27:21,378 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=539, Invalid=1101, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 19:27:21,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2018-12-03 19:27:21,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 119. [2018-12-03 19:27:21,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-12-03 19:27:21,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 138 transitions. [2018-12-03 19:27:21,388 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 138 transitions. Word has length 50 [2018-12-03 19:27:21,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:21,388 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 138 transitions. [2018-12-03 19:27:21,388 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 19:27:21,388 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 138 transitions. [2018-12-03 19:27:21,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-12-03 19:27:21,389 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:21,390 INFO L402 BasicCegarLoop]: trace histogram [24, 22, 3, 1, 1, 1] [2018-12-03 19:27:21,390 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:21,390 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:21,390 INFO L82 PathProgramCache]: Analyzing trace with hash -16269184, now seen corresponding path program 15 times [2018-12-03 19:27:21,390 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:21,391 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:21,391 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:21,391 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:21,392 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:21,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:21,895 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 319 proven. 196 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:21,895 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:21,895 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:21,895 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:21,895 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:21,895 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:21,895 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 19:27:21,904 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:27:21,904 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:27:21,936 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:27:21,936 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:21,942 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:21,957 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 319 proven. 196 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:21,957 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:22,311 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 319 proven. 196 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:22,330 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:22,330 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-12-03 19:27:22,330 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:22,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 19:27:22,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 19:27:22,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-12-03 19:27:22,331 INFO L87 Difference]: Start difference. First operand 119 states and 138 transitions. Second operand 17 states. [2018-12-03 19:27:22,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:22,482 INFO L93 Difference]: Finished difference Result 210 states and 248 transitions. [2018-12-03 19:27:22,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 19:27:22,482 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 52 [2018-12-03 19:27:22,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:22,486 INFO L225 Difference]: With dead ends: 210 [2018-12-03 19:27:22,486 INFO L226 Difference]: Without dead ends: 121 [2018-12-03 19:27:22,487 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-12-03 19:27:22,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-12-03 19:27:22,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2018-12-03 19:27:22,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2018-12-03 19:27:22,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 140 transitions. [2018-12-03 19:27:22,499 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 140 transitions. Word has length 52 [2018-12-03 19:27:22,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:22,500 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 140 transitions. [2018-12-03 19:27:22,500 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 19:27:22,500 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 140 transitions. [2018-12-03 19:27:22,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-12-03 19:27:22,501 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:22,501 INFO L402 BasicCegarLoop]: trace histogram [25, 23, 3, 1, 1, 1] [2018-12-03 19:27:22,502 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:22,502 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:22,502 INFO L82 PathProgramCache]: Analyzing trace with hash -2033229446, now seen corresponding path program 16 times [2018-12-03 19:27:22,502 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:22,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:22,503 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:22,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:22,503 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:22,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:22,687 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 341 proven. 225 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:22,687 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:22,687 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:22,687 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:22,688 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:22,688 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:22,688 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 19:27:22,699 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:22,700 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:22,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:22,729 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:22,737 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 341 proven. 225 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:22,738 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:23,383 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 341 proven. 225 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:23,420 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:23,420 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-12-03 19:27:23,420 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:23,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 19:27:23,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 19:27:23,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 19:27:23,422 INFO L87 Difference]: Start difference. First operand 121 states and 140 transitions. Second operand 18 states. [2018-12-03 19:27:23,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:23,852 INFO L93 Difference]: Finished difference Result 212 states and 250 transitions. [2018-12-03 19:27:23,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 19:27:23,852 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 54 [2018-12-03 19:27:23,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:23,853 INFO L225 Difference]: With dead ends: 212 [2018-12-03 19:27:23,853 INFO L226 Difference]: Without dead ends: 123 [2018-12-03 19:27:23,854 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 19:27:23,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-12-03 19:27:23,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2018-12-03 19:27:23,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-12-03 19:27:23,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 142 transitions. [2018-12-03 19:27:23,862 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 142 transitions. Word has length 54 [2018-12-03 19:27:23,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:23,862 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 142 transitions. [2018-12-03 19:27:23,863 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 19:27:23,863 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 142 transitions. [2018-12-03 19:27:23,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-12-03 19:27:23,864 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:23,864 INFO L402 BasicCegarLoop]: trace histogram [26, 24, 3, 1, 1, 1] [2018-12-03 19:27:23,864 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:23,864 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:23,864 INFO L82 PathProgramCache]: Analyzing trace with hash 993176564, now seen corresponding path program 17 times [2018-12-03 19:27:23,865 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:23,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:23,865 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:23,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:23,866 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:23,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:24,212 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 363 proven. 256 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:24,213 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:24,213 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:24,213 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:24,213 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:24,213 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:24,213 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 19:27:24,222 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:24,222 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:24,243 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-12-03 19:27:24,243 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:24,245 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:24,389 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 333 proven. 12 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-12-03 19:27:24,389 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:24,479 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 333 proven. 12 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-12-03 19:27:24,507 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:24,507 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 7, 7] total 29 [2018-12-03 19:27:24,507 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:24,508 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-03 19:27:24,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-03 19:27:24,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=576, Unknown=0, NotChecked=0, Total=812 [2018-12-03 19:27:24,509 INFO L87 Difference]: Start difference. First operand 123 states and 142 transitions. Second operand 24 states. [2018-12-03 19:27:25,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:25,447 INFO L93 Difference]: Finished difference Result 240 states and 287 transitions. [2018-12-03 19:27:25,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-12-03 19:27:25,448 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 56 [2018-12-03 19:27:25,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:25,449 INFO L225 Difference]: With dead ends: 240 [2018-12-03 19:27:25,449 INFO L226 Difference]: Without dead ends: 151 [2018-12-03 19:27:25,451 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 425 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=793, Invalid=1657, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 19:27:25,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-12-03 19:27:25,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 147. [2018-12-03 19:27:25,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-12-03 19:27:25,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 168 transitions. [2018-12-03 19:27:25,460 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 168 transitions. Word has length 56 [2018-12-03 19:27:25,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:25,460 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 168 transitions. [2018-12-03 19:27:25,460 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-03 19:27:25,460 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 168 transitions. [2018-12-03 19:27:25,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-12-03 19:27:25,461 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:25,461 INFO L402 BasicCegarLoop]: trace histogram [27, 25, 3, 1, 1, 1] [2018-12-03 19:27:25,462 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:25,462 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:25,462 INFO L82 PathProgramCache]: Analyzing trace with hash 464468334, now seen corresponding path program 18 times [2018-12-03 19:27:25,462 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:25,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:25,463 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:25,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:25,463 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:25,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:25,772 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 385 proven. 289 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:25,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:25,773 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:25,773 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:25,773 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:25,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:25,773 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 19:27:25,781 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:27:25,781 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:27:25,807 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:27:25,807 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:25,809 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:25,818 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 385 proven. 289 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:25,818 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:26,910 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 385 proven. 289 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:26,930 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:26,931 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-12-03 19:27:26,931 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:26,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 19:27:26,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 19:27:26,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 19:27:26,932 INFO L87 Difference]: Start difference. First operand 147 states and 168 transitions. Second operand 20 states. [2018-12-03 19:27:26,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:26,977 INFO L93 Difference]: Finished difference Result 260 states and 302 transitions. [2018-12-03 19:27:26,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 19:27:26,977 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 58 [2018-12-03 19:27:26,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:26,978 INFO L225 Difference]: With dead ends: 260 [2018-12-03 19:27:26,978 INFO L226 Difference]: Without dead ends: 149 [2018-12-03 19:27:26,979 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 19:27:26,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-12-03 19:27:26,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2018-12-03 19:27:26,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-12-03 19:27:26,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 170 transitions. [2018-12-03 19:27:26,989 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 170 transitions. Word has length 58 [2018-12-03 19:27:26,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:26,989 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 170 transitions. [2018-12-03 19:27:26,989 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 19:27:26,989 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 170 transitions. [2018-12-03 19:27:26,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-12-03 19:27:26,990 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:26,990 INFO L402 BasicCegarLoop]: trace histogram [28, 26, 3, 1, 1, 1] [2018-12-03 19:27:26,990 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:26,991 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:26,991 INFO L82 PathProgramCache]: Analyzing trace with hash 1357544, now seen corresponding path program 19 times [2018-12-03 19:27:26,991 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:26,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:26,992 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:26,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:26,992 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:27,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:27,312 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 407 proven. 324 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:27,313 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:27,313 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:27,313 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:27,313 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:27,313 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:27,313 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 19:27:27,334 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:27,334 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:27,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:27,360 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:27,371 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 407 proven. 324 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:27,372 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:27,919 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 407 proven. 324 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:27,940 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:27,940 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-12-03 19:27:27,940 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:27,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 19:27:27,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 19:27:27,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-12-03 19:27:27,941 INFO L87 Difference]: Start difference. First operand 149 states and 170 transitions. Second operand 21 states. [2018-12-03 19:27:28,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:28,031 INFO L93 Difference]: Finished difference Result 262 states and 304 transitions. [2018-12-03 19:27:28,033 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 19:27:28,033 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2018-12-03 19:27:28,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:28,034 INFO L225 Difference]: With dead ends: 262 [2018-12-03 19:27:28,034 INFO L226 Difference]: Without dead ends: 151 [2018-12-03 19:27:28,035 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-12-03 19:27:28,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-12-03 19:27:28,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2018-12-03 19:27:28,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-12-03 19:27:28,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 172 transitions. [2018-12-03 19:27:28,043 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 172 transitions. Word has length 60 [2018-12-03 19:27:28,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:28,043 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 172 transitions. [2018-12-03 19:27:28,043 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 19:27:28,043 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 172 transitions. [2018-12-03 19:27:28,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 19:27:28,044 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:28,044 INFO L402 BasicCegarLoop]: trace histogram [29, 27, 3, 1, 1, 1] [2018-12-03 19:27:28,044 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:28,045 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:28,045 INFO L82 PathProgramCache]: Analyzing trace with hash 1628487138, now seen corresponding path program 20 times [2018-12-03 19:27:28,045 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:28,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:28,046 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:28,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:28,046 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:28,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:28,284 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 429 proven. 361 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:28,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:28,285 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:28,285 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:28,285 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:28,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:28,285 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 19:27:28,293 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:28,294 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:28,315 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-12-03 19:27:28,316 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:28,317 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:28,401 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 328 proven. 20 refuted. 0 times theorem prover too weak. 552 trivial. 0 not checked. [2018-12-03 19:27:28,402 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:28,504 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 328 proven. 20 refuted. 0 times theorem prover too weak. 552 trivial. 0 not checked. [2018-12-03 19:27:28,526 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:28,526 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 8, 8] total 34 [2018-12-03 19:27:28,526 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:28,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-12-03 19:27:28,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-12-03 19:27:28,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 19:27:28,527 INFO L87 Difference]: Start difference. First operand 151 states and 172 transitions. Second operand 28 states. [2018-12-03 19:27:29,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:29,237 INFO L93 Difference]: Finished difference Result 291 states and 341 transitions. [2018-12-03 19:27:29,238 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 19:27:29,238 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 62 [2018-12-03 19:27:29,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:29,239 INFO L225 Difference]: With dead ends: 291 [2018-12-03 19:27:29,240 INFO L226 Difference]: Without dead ends: 180 [2018-12-03 19:27:29,242 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 608 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1096, Invalid=2326, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 19:27:29,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-12-03 19:27:29,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 175. [2018-12-03 19:27:29,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-12-03 19:27:29,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 198 transitions. [2018-12-03 19:27:29,250 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 198 transitions. Word has length 62 [2018-12-03 19:27:29,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:29,251 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 198 transitions. [2018-12-03 19:27:29,251 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-12-03 19:27:29,251 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 198 transitions. [2018-12-03 19:27:29,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-12-03 19:27:29,252 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:29,252 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 2, 1, 1, 1] [2018-12-03 19:27:29,252 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:29,252 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:29,252 INFO L82 PathProgramCache]: Analyzing trace with hash -1711843558, now seen corresponding path program 21 times [2018-12-03 19:27:29,252 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:29,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:29,253 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:29,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:29,253 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:29,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:30,306 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 451 proven. 400 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:30,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:30,306 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:30,306 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:30,306 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:30,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:30,306 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 19:27:30,315 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:27:30,316 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:27:30,339 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:27:30,339 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:30,341 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:30,350 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 451 proven. 400 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:30,350 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:30,830 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 451 proven. 400 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:30,849 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:30,849 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-12-03 19:27:30,849 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:30,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 19:27:30,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 19:27:30,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 19:27:30,851 INFO L87 Difference]: Start difference. First operand 175 states and 198 transitions. Second operand 23 states. [2018-12-03 19:27:30,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:30,902 INFO L93 Difference]: Finished difference Result 310 states and 356 transitions. [2018-12-03 19:27:30,908 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 19:27:30,909 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 64 [2018-12-03 19:27:30,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:30,909 INFO L225 Difference]: With dead ends: 310 [2018-12-03 19:27:30,909 INFO L226 Difference]: Without dead ends: 177 [2018-12-03 19:27:30,910 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 19:27:30,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-12-03 19:27:30,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2018-12-03 19:27:30,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-12-03 19:27:30,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 200 transitions. [2018-12-03 19:27:30,919 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 200 transitions. Word has length 64 [2018-12-03 19:27:30,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:30,919 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 200 transitions. [2018-12-03 19:27:30,919 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 19:27:30,919 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 200 transitions. [2018-12-03 19:27:30,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-12-03 19:27:30,920 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:30,920 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 2, 1, 1, 1] [2018-12-03 19:27:30,920 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:30,921 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:30,921 INFO L82 PathProgramCache]: Analyzing trace with hash 2135118100, now seen corresponding path program 22 times [2018-12-03 19:27:30,921 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:30,921 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:30,921 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:30,922 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:30,922 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:30,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:31,181 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 473 proven. 441 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:31,182 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:31,182 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:31,182 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:31,182 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:31,182 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:31,182 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 19:27:31,192 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:31,192 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:31,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:31,220 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:31,231 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 473 proven. 441 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:31,231 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:31,970 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 473 proven. 441 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:31,989 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:31,989 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-12-03 19:27:31,990 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:31,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-03 19:27:31,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-03 19:27:31,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 19:27:31,991 INFO L87 Difference]: Start difference. First operand 177 states and 200 transitions. Second operand 24 states. [2018-12-03 19:27:32,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:32,064 INFO L93 Difference]: Finished difference Result 312 states and 358 transitions. [2018-12-03 19:27:32,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 19:27:32,066 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 66 [2018-12-03 19:27:32,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:32,067 INFO L225 Difference]: With dead ends: 312 [2018-12-03 19:27:32,067 INFO L226 Difference]: Without dead ends: 179 [2018-12-03 19:27:32,068 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 19:27:32,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2018-12-03 19:27:32,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2018-12-03 19:27:32,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2018-12-03 19:27:32,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 202 transitions. [2018-12-03 19:27:32,080 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 202 transitions. Word has length 66 [2018-12-03 19:27:32,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:32,080 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 202 transitions. [2018-12-03 19:27:32,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-03 19:27:32,080 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 202 transitions. [2018-12-03 19:27:32,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-12-03 19:27:32,081 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:32,081 INFO L402 BasicCegarLoop]: trace histogram [32, 31, 2, 1, 1, 1] [2018-12-03 19:27:32,082 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:32,082 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:32,082 INFO L82 PathProgramCache]: Analyzing trace with hash 1098429582, now seen corresponding path program 23 times [2018-12-03 19:27:32,082 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:32,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:32,083 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:32,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:32,083 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:32,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:32,626 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 495 proven. 484 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:32,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:32,626 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:32,627 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:32,627 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:32,627 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:32,627 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 19:27:32,635 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:32,636 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:32,668 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 19:27:32,668 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:32,669 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:32,759 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 581 proven. 30 refuted. 0 times theorem prover too weak. 478 trivial. 0 not checked. [2018-12-03 19:27:32,760 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:32,870 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 581 proven. 30 refuted. 0 times theorem prover too weak. 478 trivial. 0 not checked. [2018-12-03 19:27:32,889 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:32,889 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 9, 9] total 39 [2018-12-03 19:27:32,889 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:32,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 19:27:32,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 19:27:32,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=1063, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 19:27:32,891 INFO L87 Difference]: Start difference. First operand 179 states and 202 transitions. Second operand 32 states. [2018-12-03 19:27:33,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:33,658 INFO L93 Difference]: Finished difference Result 342 states and 395 transitions. [2018-12-03 19:27:33,658 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-12-03 19:27:33,658 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 68 [2018-12-03 19:27:33,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:33,660 INFO L225 Difference]: With dead ends: 342 [2018-12-03 19:27:33,660 INFO L226 Difference]: Without dead ends: 209 [2018-12-03 19:27:33,662 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 823 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1448, Invalid=3108, Unknown=0, NotChecked=0, Total=4556 [2018-12-03 19:27:33,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2018-12-03 19:27:33,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 203. [2018-12-03 19:27:33,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 203 states. [2018-12-03 19:27:33,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 228 transitions. [2018-12-03 19:27:33,670 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 228 transitions. Word has length 68 [2018-12-03 19:27:33,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:33,671 INFO L480 AbstractCegarLoop]: Abstraction has 203 states and 228 transitions. [2018-12-03 19:27:33,671 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 19:27:33,671 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 228 transitions. [2018-12-03 19:27:33,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-12-03 19:27:33,672 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:33,672 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 2, 1, 1, 1] [2018-12-03 19:27:33,672 INFO L423 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:33,672 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:33,672 INFO L82 PathProgramCache]: Analyzing trace with hash 1689496072, now seen corresponding path program 24 times [2018-12-03 19:27:33,672 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:33,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:33,673 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:33,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:33,673 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:33,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:34,287 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 517 proven. 529 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:34,287 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:34,287 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:34,288 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:34,288 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:34,288 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:34,288 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 19:27:34,297 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:27:34,297 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:27:34,325 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:27:34,325 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:34,326 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:34,335 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 517 proven. 529 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:34,335 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:34,949 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 517 proven. 529 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:34,967 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:34,967 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-12-03 19:27:34,967 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:34,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 19:27:34,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 19:27:34,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 19:27:34,969 INFO L87 Difference]: Start difference. First operand 203 states and 228 transitions. Second operand 26 states. [2018-12-03 19:27:35,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:35,493 INFO L93 Difference]: Finished difference Result 360 states and 410 transitions. [2018-12-03 19:27:35,494 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 19:27:35,494 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 70 [2018-12-03 19:27:35,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:35,495 INFO L225 Difference]: With dead ends: 360 [2018-12-03 19:27:35,495 INFO L226 Difference]: Without dead ends: 205 [2018-12-03 19:27:35,497 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 19:27:35,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-12-03 19:27:35,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2018-12-03 19:27:35,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-12-03 19:27:35,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 230 transitions. [2018-12-03 19:27:35,508 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 230 transitions. Word has length 70 [2018-12-03 19:27:35,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:35,508 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 230 transitions. [2018-12-03 19:27:35,509 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 19:27:35,509 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 230 transitions. [2018-12-03 19:27:35,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 19:27:35,510 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:35,510 INFO L402 BasicCegarLoop]: trace histogram [34, 33, 2, 1, 1, 1] [2018-12-03 19:27:35,510 INFO L423 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:35,510 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:35,510 INFO L82 PathProgramCache]: Analyzing trace with hash 2117517442, now seen corresponding path program 25 times [2018-12-03 19:27:35,510 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:35,511 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:35,511 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:35,511 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:35,511 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:35,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:36,613 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 539 proven. 576 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:36,614 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:36,614 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:36,614 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:36,614 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:36,614 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:36,614 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 19:27:36,622 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:36,622 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:36,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:36,663 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:36,674 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 539 proven. 576 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:36,674 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:37,407 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 539 proven. 576 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:37,425 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:37,425 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-12-03 19:27:37,425 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:37,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 19:27:37,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 19:27:37,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-12-03 19:27:37,427 INFO L87 Difference]: Start difference. First operand 205 states and 230 transitions. Second operand 27 states. [2018-12-03 19:27:37,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:37,529 INFO L93 Difference]: Finished difference Result 362 states and 412 transitions. [2018-12-03 19:27:37,530 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 19:27:37,530 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 72 [2018-12-03 19:27:37,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:37,532 INFO L225 Difference]: With dead ends: 362 [2018-12-03 19:27:37,532 INFO L226 Difference]: Without dead ends: 207 [2018-12-03 19:27:37,533 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-12-03 19:27:37,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-12-03 19:27:37,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2018-12-03 19:27:37,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-12-03 19:27:37,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 232 transitions. [2018-12-03 19:27:37,542 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 232 transitions. Word has length 72 [2018-12-03 19:27:37,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:37,542 INFO L480 AbstractCegarLoop]: Abstraction has 207 states and 232 transitions. [2018-12-03 19:27:37,542 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 19:27:37,543 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 232 transitions. [2018-12-03 19:27:37,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-12-03 19:27:37,543 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:37,543 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 2, 1, 1, 1] [2018-12-03 19:27:37,544 INFO L423 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:37,544 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:37,544 INFO L82 PathProgramCache]: Analyzing trace with hash 1129193596, now seen corresponding path program 26 times [2018-12-03 19:27:37,544 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:37,545 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:37,545 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:37,545 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:37,545 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:37,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:37,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 561 proven. 625 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:37,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:37,951 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:37,951 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:37,951 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:37,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:37,951 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 19:27:37,960 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:37,960 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:37,990 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 19:27:37,991 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:37,993 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:38,115 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 645 proven. 42 refuted. 0 times theorem prover too weak. 609 trivial. 0 not checked. [2018-12-03 19:27:38,115 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:38,261 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 645 proven. 42 refuted. 0 times theorem prover too weak. 609 trivial. 0 not checked. [2018-12-03 19:27:38,280 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:38,280 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 10, 10] total 44 [2018-12-03 19:27:38,280 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:38,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-12-03 19:27:38,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-12-03 19:27:38,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=1362, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 19:27:38,281 INFO L87 Difference]: Start difference. First operand 207 states and 232 transitions. Second operand 36 states. [2018-12-03 19:27:39,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:39,203 INFO L93 Difference]: Finished difference Result 393 states and 449 transitions. [2018-12-03 19:27:39,203 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 19:27:39,203 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 74 [2018-12-03 19:27:39,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:39,205 INFO L225 Difference]: With dead ends: 393 [2018-12-03 19:27:39,205 INFO L226 Difference]: Without dead ends: 238 [2018-12-03 19:27:39,207 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1070 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1849, Invalid=4003, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 19:27:39,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2018-12-03 19:27:39,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 231. [2018-12-03 19:27:39,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 231 states. [2018-12-03 19:27:39,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 258 transitions. [2018-12-03 19:27:39,216 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 258 transitions. Word has length 74 [2018-12-03 19:27:39,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:39,217 INFO L480 AbstractCegarLoop]: Abstraction has 231 states and 258 transitions. [2018-12-03 19:27:39,217 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-12-03 19:27:39,217 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 258 transitions. [2018-12-03 19:27:39,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-12-03 19:27:39,217 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:39,217 INFO L402 BasicCegarLoop]: trace histogram [36, 35, 2, 1, 1, 1] [2018-12-03 19:27:39,218 INFO L423 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:39,218 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:39,218 INFO L82 PathProgramCache]: Analyzing trace with hash -328854922, now seen corresponding path program 27 times [2018-12-03 19:27:39,218 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:39,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:39,219 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:39,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:39,219 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:39,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:39,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 583 proven. 676 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:39,755 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:39,755 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:39,755 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:39,755 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:39,755 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:39,755 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 19:27:39,774 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:27:39,774 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:27:39,806 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:27:39,806 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:39,808 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:39,818 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 583 proven. 676 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:39,818 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:40,863 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 583 proven. 676 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:40,882 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:40,882 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-12-03 19:27:40,883 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:40,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 19:27:40,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 19:27:40,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 19:27:40,885 INFO L87 Difference]: Start difference. First operand 231 states and 258 transitions. Second operand 29 states. [2018-12-03 19:27:41,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:41,154 INFO L93 Difference]: Finished difference Result 410 states and 464 transitions. [2018-12-03 19:27:41,154 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 19:27:41,154 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 76 [2018-12-03 19:27:41,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:41,156 INFO L225 Difference]: With dead ends: 410 [2018-12-03 19:27:41,156 INFO L226 Difference]: Without dead ends: 233 [2018-12-03 19:27:41,157 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 19:27:41,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2018-12-03 19:27:41,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 233. [2018-12-03 19:27:41,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2018-12-03 19:27:41,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 260 transitions. [2018-12-03 19:27:41,167 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 260 transitions. Word has length 76 [2018-12-03 19:27:41,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:41,167 INFO L480 AbstractCegarLoop]: Abstraction has 233 states and 260 transitions. [2018-12-03 19:27:41,167 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 19:27:41,168 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 260 transitions. [2018-12-03 19:27:41,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-12-03 19:27:41,168 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:41,168 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 2, 1, 1, 1] [2018-12-03 19:27:41,169 INFO L423 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:41,169 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:41,169 INFO L82 PathProgramCache]: Analyzing trace with hash -1770461840, now seen corresponding path program 28 times [2018-12-03 19:27:41,169 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:41,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:41,170 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:41,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:41,170 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:41,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:41,745 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 605 proven. 729 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:41,746 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:41,746 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:41,746 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:41,746 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:41,746 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:41,746 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 19:27:41,755 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:41,755 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:41,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:41,787 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:41,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 605 proven. 729 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:41,799 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:42,964 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 605 proven. 729 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:42,983 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:42,983 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-12-03 19:27:42,983 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:42,983 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-12-03 19:27:42,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-12-03 19:27:42,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 19:27:42,985 INFO L87 Difference]: Start difference. First operand 233 states and 260 transitions. Second operand 30 states. [2018-12-03 19:27:43,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:43,063 INFO L93 Difference]: Finished difference Result 412 states and 466 transitions. [2018-12-03 19:27:43,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-12-03 19:27:43,073 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 78 [2018-12-03 19:27:43,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:43,074 INFO L225 Difference]: With dead ends: 412 [2018-12-03 19:27:43,074 INFO L226 Difference]: Without dead ends: 235 [2018-12-03 19:27:43,075 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 19:27:43,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2018-12-03 19:27:43,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 235. [2018-12-03 19:27:43,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 235 states. [2018-12-03 19:27:43,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 262 transitions. [2018-12-03 19:27:43,085 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 262 transitions. Word has length 78 [2018-12-03 19:27:43,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:43,085 INFO L480 AbstractCegarLoop]: Abstraction has 235 states and 262 transitions. [2018-12-03 19:27:43,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-12-03 19:27:43,085 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 262 transitions. [2018-12-03 19:27:43,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-12-03 19:27:43,086 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:43,086 INFO L402 BasicCegarLoop]: trace histogram [38, 37, 2, 1, 1, 1] [2018-12-03 19:27:43,086 INFO L423 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:43,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:43,086 INFO L82 PathProgramCache]: Analyzing trace with hash 119726570, now seen corresponding path program 29 times [2018-12-03 19:27:43,087 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:43,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:43,087 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:43,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:43,088 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:43,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:43,482 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 627 proven. 784 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:43,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:43,482 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:43,482 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:43,482 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:43,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:43,482 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:27:43,491 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:43,491 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:43,517 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 19:27:43,517 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:43,518 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:43,694 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 705 proven. 56 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-12-03 19:27:43,694 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:43,927 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 705 proven. 56 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-12-03 19:27:43,945 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:43,945 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 11, 11] total 49 [2018-12-03 19:27:43,945 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:43,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-12-03 19:27:43,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-12-03 19:27:43,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=654, Invalid=1698, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 19:27:43,947 INFO L87 Difference]: Start difference. First operand 235 states and 262 transitions. Second operand 40 states. [2018-12-03 19:27:44,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:44,947 INFO L93 Difference]: Finished difference Result 444 states and 503 transitions. [2018-12-03 19:27:44,948 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-12-03 19:27:44,948 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 80 [2018-12-03 19:27:44,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:44,949 INFO L225 Difference]: With dead ends: 444 [2018-12-03 19:27:44,949 INFO L226 Difference]: Without dead ends: 267 [2018-12-03 19:27:44,950 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1349 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2299, Invalid=5011, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 19:27:44,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2018-12-03 19:27:44,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 259. [2018-12-03 19:27:44,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-12-03 19:27:44,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 288 transitions. [2018-12-03 19:27:44,961 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 288 transitions. Word has length 80 [2018-12-03 19:27:44,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:44,961 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 288 transitions. [2018-12-03 19:27:44,961 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-12-03 19:27:44,961 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 288 transitions. [2018-12-03 19:27:44,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-12-03 19:27:44,962 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:44,962 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 2, 1, 1, 1] [2018-12-03 19:27:44,963 INFO L423 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:44,963 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:44,963 INFO L82 PathProgramCache]: Analyzing trace with hash -123178908, now seen corresponding path program 30 times [2018-12-03 19:27:44,963 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:44,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:44,964 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:44,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:44,964 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:44,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:45,872 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 649 proven. 841 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:45,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:45,873 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:45,873 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:45,873 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:45,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:45,873 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 19:27:45,882 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:27:45,882 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:27:45,915 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:27:45,915 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:45,917 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:45,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 649 proven. 841 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:45,931 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:47,272 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 649 proven. 841 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:47,291 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:47,291 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-12-03 19:27:47,291 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:47,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 19:27:47,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 19:27:47,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 19:27:47,292 INFO L87 Difference]: Start difference. First operand 259 states and 288 transitions. Second operand 32 states. [2018-12-03 19:27:47,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:47,371 INFO L93 Difference]: Finished difference Result 460 states and 518 transitions. [2018-12-03 19:27:47,377 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-12-03 19:27:47,377 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 82 [2018-12-03 19:27:47,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:47,378 INFO L225 Difference]: With dead ends: 460 [2018-12-03 19:27:47,378 INFO L226 Difference]: Without dead ends: 261 [2018-12-03 19:27:47,379 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 19:27:47,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2018-12-03 19:27:47,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 261. [2018-12-03 19:27:47,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 261 states. [2018-12-03 19:27:47,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 290 transitions. [2018-12-03 19:27:47,390 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 290 transitions. Word has length 82 [2018-12-03 19:27:47,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:47,390 INFO L480 AbstractCegarLoop]: Abstraction has 261 states and 290 transitions. [2018-12-03 19:27:47,390 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 19:27:47,390 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 290 transitions. [2018-12-03 19:27:47,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-12-03 19:27:47,391 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:47,391 INFO L402 BasicCegarLoop]: trace histogram [40, 39, 2, 1, 1, 1] [2018-12-03 19:27:47,391 INFO L423 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:47,391 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:47,392 INFO L82 PathProgramCache]: Analyzing trace with hash -760504354, now seen corresponding path program 31 times [2018-12-03 19:27:47,392 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:47,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:47,392 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:47,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:47,393 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:47,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:47,854 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 671 proven. 900 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:47,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:47,854 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:47,855 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:47,855 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:47,855 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:47,855 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 19:27:47,863 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:47,863 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:47,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:47,896 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:47,907 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 671 proven. 900 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:47,908 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:48,942 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 671 proven. 900 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:48,961 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:48,962 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-12-03 19:27:48,962 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:48,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-12-03 19:27:48,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-12-03 19:27:48,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2018-12-03 19:27:48,963 INFO L87 Difference]: Start difference. First operand 261 states and 290 transitions. Second operand 33 states. [2018-12-03 19:27:49,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:49,082 INFO L93 Difference]: Finished difference Result 462 states and 520 transitions. [2018-12-03 19:27:49,083 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 19:27:49,083 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 84 [2018-12-03 19:27:49,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:49,084 INFO L225 Difference]: With dead ends: 462 [2018-12-03 19:27:49,084 INFO L226 Difference]: Without dead ends: 263 [2018-12-03 19:27:49,085 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2018-12-03 19:27:49,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2018-12-03 19:27:49,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 263. [2018-12-03 19:27:49,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 263 states. [2018-12-03 19:27:49,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 292 transitions. [2018-12-03 19:27:49,096 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 292 transitions. Word has length 84 [2018-12-03 19:27:49,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:49,096 INFO L480 AbstractCegarLoop]: Abstraction has 263 states and 292 transitions. [2018-12-03 19:27:49,096 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-12-03 19:27:49,096 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 292 transitions. [2018-12-03 19:27:49,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 19:27:49,097 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:49,097 INFO L402 BasicCegarLoop]: trace histogram [41, 40, 2, 1, 1, 1] [2018-12-03 19:27:49,097 INFO L423 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:49,097 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:49,097 INFO L82 PathProgramCache]: Analyzing trace with hash 950065368, now seen corresponding path program 32 times [2018-12-03 19:27:49,097 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:49,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:49,098 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:49,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:49,098 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:49,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:49,641 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 693 proven. 961 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:49,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:49,641 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:49,641 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:49,641 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:49,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:49,641 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 19:27:49,650 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:49,651 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:49,681 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 19:27:49,682 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:49,683 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:50,455 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 761 proven. 72 refuted. 0 times theorem prover too weak. 931 trivial. 0 not checked. [2018-12-03 19:27:50,456 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:50,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 761 proven. 72 refuted. 0 times theorem prover too weak. 931 trivial. 0 not checked. [2018-12-03 19:27:50,864 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:50,864 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 12, 12] total 54 [2018-12-03 19:27:50,864 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:50,865 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 19:27:50,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 19:27:50,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=791, Invalid=2071, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 19:27:50,866 INFO L87 Difference]: Start difference. First operand 263 states and 292 transitions. Second operand 44 states. [2018-12-03 19:27:51,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:51,947 INFO L93 Difference]: Finished difference Result 495 states and 557 transitions. [2018-12-03 19:27:51,948 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 19:27:51,948 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 86 [2018-12-03 19:27:51,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:51,950 INFO L225 Difference]: With dead ends: 495 [2018-12-03 19:27:51,950 INFO L226 Difference]: Without dead ends: 296 [2018-12-03 19:27:51,952 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1660 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2798, Invalid=6132, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 19:27:51,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2018-12-03 19:27:51,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 287. [2018-12-03 19:27:51,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2018-12-03 19:27:51,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 318 transitions. [2018-12-03 19:27:51,963 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 318 transitions. Word has length 86 [2018-12-03 19:27:51,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:51,966 INFO L480 AbstractCegarLoop]: Abstraction has 287 states and 318 transitions. [2018-12-03 19:27:51,966 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 19:27:51,966 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 318 transitions. [2018-12-03 19:27:51,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-12-03 19:27:51,967 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:51,967 INFO L402 BasicCegarLoop]: trace histogram [42, 41, 2, 1, 1, 1] [2018-12-03 19:27:51,967 INFO L423 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:51,967 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:51,967 INFO L82 PathProgramCache]: Analyzing trace with hash -164846638, now seen corresponding path program 33 times [2018-12-03 19:27:51,967 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:51,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:51,968 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:51,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:51,968 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:51,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:52,461 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 715 proven. 1024 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:52,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:52,461 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:52,461 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:52,461 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:52,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:52,462 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 19:27:52,470 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:27:52,470 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:27:52,504 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:27:52,505 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:52,506 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:52,518 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 715 proven. 1024 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:52,518 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:53,934 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 715 proven. 1024 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:53,952 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:53,953 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2018-12-03 19:27:53,953 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:53,953 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 19:27:53,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 19:27:53,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2018-12-03 19:27:53,954 INFO L87 Difference]: Start difference. First operand 287 states and 318 transitions. Second operand 35 states. [2018-12-03 19:27:54,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:54,048 INFO L93 Difference]: Finished difference Result 510 states and 572 transitions. [2018-12-03 19:27:54,048 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 19:27:54,048 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 88 [2018-12-03 19:27:54,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:54,049 INFO L225 Difference]: With dead ends: 510 [2018-12-03 19:27:54,049 INFO L226 Difference]: Without dead ends: 289 [2018-12-03 19:27:54,050 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2018-12-03 19:27:54,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2018-12-03 19:27:54,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2018-12-03 19:27:54,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2018-12-03 19:27:54,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 320 transitions. [2018-12-03 19:27:54,061 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 320 transitions. Word has length 88 [2018-12-03 19:27:54,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:54,061 INFO L480 AbstractCegarLoop]: Abstraction has 289 states and 320 transitions. [2018-12-03 19:27:54,061 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 19:27:54,061 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 320 transitions. [2018-12-03 19:27:54,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-12-03 19:27:54,062 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:54,062 INFO L402 BasicCegarLoop]: trace histogram [43, 42, 2, 1, 1, 1] [2018-12-03 19:27:54,063 INFO L423 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:54,063 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:54,063 INFO L82 PathProgramCache]: Analyzing trace with hash 2089340876, now seen corresponding path program 34 times [2018-12-03 19:27:54,063 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:54,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:54,064 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:54,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:54,064 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:54,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:54,604 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 737 proven. 1089 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:54,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:54,605 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:54,605 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:54,605 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:54,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:54,605 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 19:27:54,614 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:54,614 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:27:54,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:54,645 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:54,658 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 737 proven. 1089 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:54,659 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:56,124 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 737 proven. 1089 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:56,143 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:56,143 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-12-03 19:27:56,143 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:56,143 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-12-03 19:27:56,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-12-03 19:27:56,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2415, Invalid=2415, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 19:27:56,144 INFO L87 Difference]: Start difference. First operand 289 states and 320 transitions. Second operand 36 states. [2018-12-03 19:27:56,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:56,232 INFO L93 Difference]: Finished difference Result 512 states and 574 transitions. [2018-12-03 19:27:56,232 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-12-03 19:27:56,232 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 90 [2018-12-03 19:27:56,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:56,234 INFO L225 Difference]: With dead ends: 512 [2018-12-03 19:27:56,234 INFO L226 Difference]: Without dead ends: 291 [2018-12-03 19:27:56,235 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2415, Invalid=2415, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 19:27:56,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2018-12-03 19:27:56,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 291. [2018-12-03 19:27:56,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 291 states. [2018-12-03 19:27:56,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 322 transitions. [2018-12-03 19:27:56,246 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 322 transitions. Word has length 90 [2018-12-03 19:27:56,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:56,247 INFO L480 AbstractCegarLoop]: Abstraction has 291 states and 322 transitions. [2018-12-03 19:27:56,247 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-12-03 19:27:56,247 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 322 transitions. [2018-12-03 19:27:56,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-12-03 19:27:56,248 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:56,248 INFO L402 BasicCegarLoop]: trace histogram [44, 43, 2, 1, 1, 1] [2018-12-03 19:27:56,248 INFO L423 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:56,248 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:56,248 INFO L82 PathProgramCache]: Analyzing trace with hash -594942650, now seen corresponding path program 35 times [2018-12-03 19:27:56,248 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:56,249 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:56,249 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:27:56,249 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:56,249 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:56,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:56,924 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 759 proven. 1156 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:56,925 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:56,925 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:56,925 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:56,925 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:56,925 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:56,925 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 19:27:56,933 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:27:56,933 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:27:56,960 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 19:27:56,960 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:56,962 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:57,171 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 813 proven. 90 refuted. 0 times theorem prover too weak. 1122 trivial. 0 not checked. [2018-12-03 19:27:57,171 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:27:57,429 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 813 proven. 90 refuted. 0 times theorem prover too weak. 1122 trivial. 0 not checked. [2018-12-03 19:27:57,447 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:27:57,447 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 13, 13] total 59 [2018-12-03 19:27:57,447 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:27:57,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-12-03 19:27:57,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-12-03 19:27:57,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=941, Invalid=2481, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 19:27:57,449 INFO L87 Difference]: Start difference. First operand 291 states and 322 transitions. Second operand 48 states. [2018-12-03 19:27:58,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:27:58,857 INFO L93 Difference]: Finished difference Result 546 states and 611 transitions. [2018-12-03 19:27:58,857 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-12-03 19:27:58,857 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 92 [2018-12-03 19:27:58,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:27:58,858 INFO L225 Difference]: With dead ends: 546 [2018-12-03 19:27:58,858 INFO L226 Difference]: Without dead ends: 325 [2018-12-03 19:27:58,859 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2003 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3346, Invalid=7366, Unknown=0, NotChecked=0, Total=10712 [2018-12-03 19:27:58,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2018-12-03 19:27:58,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 315. [2018-12-03 19:27:58,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 315 states. [2018-12-03 19:27:58,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 348 transitions. [2018-12-03 19:27:58,871 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 348 transitions. Word has length 92 [2018-12-03 19:27:58,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:27:58,872 INFO L480 AbstractCegarLoop]: Abstraction has 315 states and 348 transitions. [2018-12-03 19:27:58,872 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-12-03 19:27:58,872 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 348 transitions. [2018-12-03 19:27:58,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-12-03 19:27:58,872 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:27:58,873 INFO L402 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1] [2018-12-03 19:27:58,873 INFO L423 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:27:58,873 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:27:58,873 INFO L82 PathProgramCache]: Analyzing trace with hash 1083933822, now seen corresponding path program 36 times [2018-12-03 19:27:58,873 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:27:58,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:58,874 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:27:58,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:27:58,874 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:27:58,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:27:59,801 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 781 proven. 1225 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:59,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:59,801 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:27:59,801 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:27:59,802 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:27:59,802 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:27:59,802 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 19:27:59,811 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:27:59,811 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:27:59,845 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:27:59,845 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:27:59,847 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:27:59,858 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 781 proven. 1225 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:27:59,858 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:01,484 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 781 proven. 1225 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:28:01,503 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:01,504 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-12-03 19:28:01,504 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:01,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 19:28:01,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 19:28:01,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 19:28:01,505 INFO L87 Difference]: Start difference. First operand 315 states and 348 transitions. Second operand 38 states. [2018-12-03 19:28:01,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:01,569 INFO L93 Difference]: Finished difference Result 560 states and 626 transitions. [2018-12-03 19:28:01,569 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-12-03 19:28:01,569 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 94 [2018-12-03 19:28:01,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:01,571 INFO L225 Difference]: With dead ends: 560 [2018-12-03 19:28:01,571 INFO L226 Difference]: Without dead ends: 317 [2018-12-03 19:28:01,572 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 19:28:01,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2018-12-03 19:28:01,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 317. [2018-12-03 19:28:01,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 317 states. [2018-12-03 19:28:01,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 350 transitions. [2018-12-03 19:28:01,583 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 350 transitions. Word has length 94 [2018-12-03 19:28:01,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:01,584 INFO L480 AbstractCegarLoop]: Abstraction has 317 states and 350 transitions. [2018-12-03 19:28:01,584 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 19:28:01,584 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 350 transitions. [2018-12-03 19:28:01,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-12-03 19:28:01,584 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:01,585 INFO L402 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1] [2018-12-03 19:28:01,585 INFO L423 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:01,585 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:01,585 INFO L82 PathProgramCache]: Analyzing trace with hash -423539464, now seen corresponding path program 37 times [2018-12-03 19:28:01,585 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:01,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:01,586 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:01,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:01,586 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:01,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:02,274 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 803 proven. 1296 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:28:02,274 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:02,275 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:02,275 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:02,275 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:02,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:02,275 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:28:02,290 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:28:02,291 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:28:02,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:02,337 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:02,352 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 803 proven. 1296 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:28:02,352 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:03,983 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 803 proven. 1296 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:28:04,002 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:04,003 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2018-12-03 19:28:04,003 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:04,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-12-03 19:28:04,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-12-03 19:28:04,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2850, Invalid=2850, Unknown=0, NotChecked=0, Total=5700 [2018-12-03 19:28:04,004 INFO L87 Difference]: Start difference. First operand 317 states and 350 transitions. Second operand 39 states. [2018-12-03 19:28:04,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:04,125 INFO L93 Difference]: Finished difference Result 562 states and 628 transitions. [2018-12-03 19:28:04,126 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 19:28:04,126 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 96 [2018-12-03 19:28:04,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:04,127 INFO L225 Difference]: With dead ends: 562 [2018-12-03 19:28:04,127 INFO L226 Difference]: Without dead ends: 319 [2018-12-03 19:28:04,128 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2850, Invalid=2850, Unknown=0, NotChecked=0, Total=5700 [2018-12-03 19:28:04,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-12-03 19:28:04,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 319. [2018-12-03 19:28:04,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 319 states. [2018-12-03 19:28:04,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 352 transitions. [2018-12-03 19:28:04,140 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 352 transitions. Word has length 96 [2018-12-03 19:28:04,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:04,141 INFO L480 AbstractCegarLoop]: Abstraction has 319 states and 352 transitions. [2018-12-03 19:28:04,141 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-12-03 19:28:04,141 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 352 transitions. [2018-12-03 19:28:04,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-12-03 19:28:04,142 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:04,142 INFO L402 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1] [2018-12-03 19:28:04,142 INFO L423 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:04,142 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:04,142 INFO L82 PathProgramCache]: Analyzing trace with hash -1701388558, now seen corresponding path program 38 times [2018-12-03 19:28:04,142 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:04,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:04,143 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:28:04,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:04,143 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:04,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:04,812 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 825 proven. 1369 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-12-03 19:28:04,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:04,812 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:04,813 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:04,813 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:04,813 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:04,813 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 19:28:04,825 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:28:04,825 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:28:04,865 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-12-03 19:28:04,865 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:04,867 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:04,900 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 898 proven. 110 refuted. 0 times theorem prover too weak. 1296 trivial. 0 not checked. [2018-12-03 19:28:04,900 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:05,364 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 898 proven. 110 refuted. 0 times theorem prover too weak. 1296 trivial. 0 not checked. [2018-12-03 19:28:05,383 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:05,383 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 13, 13] total 53 [2018-12-03 19:28:05,383 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:05,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 19:28:05,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 19:28:05,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 19:28:05,384 INFO L87 Difference]: Start difference. First operand 319 states and 352 transitions. Second operand 41 states. [2018-12-03 19:28:05,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:05,497 INFO L93 Difference]: Finished difference Result 1158 states and 1845 transitions. [2018-12-03 19:28:05,497 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 19:28:05,497 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 98 [2018-12-03 19:28:05,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:05,501 INFO L225 Difference]: With dead ends: 1158 [2018-12-03 19:28:05,501 INFO L226 Difference]: Without dead ends: 915 [2018-12-03 19:28:05,502 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 19:28:05,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 915 states. [2018-12-03 19:28:05,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 915 to 915. [2018-12-03 19:28:05,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 915 states. [2018-12-03 19:28:05,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 915 states to 915 states and 975 transitions. [2018-12-03 19:28:05,531 INFO L78 Accepts]: Start accepts. Automaton has 915 states and 975 transitions. Word has length 98 [2018-12-03 19:28:05,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:05,531 INFO L480 AbstractCegarLoop]: Abstraction has 915 states and 975 transitions. [2018-12-03 19:28:05,531 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 19:28:05,531 INFO L276 IsEmpty]: Start isEmpty. Operand 915 states and 975 transitions. [2018-12-03 19:28:05,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2018-12-03 19:28:05,533 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:05,534 INFO L402 BasicCegarLoop]: trace histogram [75, 72, 4, 1, 1, 1] [2018-12-03 19:28:05,534 INFO L423 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:05,534 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:05,534 INFO L82 PathProgramCache]: Analyzing trace with hash -1867851760, now seen corresponding path program 39 times [2018-12-03 19:28:05,534 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:05,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:05,535 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:05,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:05,535 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:05,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:06,539 INFO L134 CoverageAnalysis]: Checked inductivity of 5776 backedges. 2926 proven. 1444 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:06,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:06,539 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:06,540 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:06,540 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:06,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:06,540 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 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 19:28:06,551 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:28:06,551 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:28:06,616 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:28:06,617 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:06,620 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:06,645 INFO L134 CoverageAnalysis]: Checked inductivity of 5776 backedges. 2926 proven. 1444 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:06,646 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:08,332 INFO L134 CoverageAnalysis]: Checked inductivity of 5776 backedges. 2926 proven. 1444 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:08,350 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:08,351 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2018-12-03 19:28:08,351 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:08,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 19:28:08,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 19:28:08,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 19:28:08,354 INFO L87 Difference]: Start difference. First operand 915 states and 975 transitions. Second operand 41 states. [2018-12-03 19:28:08,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:08,777 INFO L93 Difference]: Finished difference Result 1754 states and 1874 transitions. [2018-12-03 19:28:08,777 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 19:28:08,777 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 154 [2018-12-03 19:28:08,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:08,781 INFO L225 Difference]: With dead ends: 1754 [2018-12-03 19:28:08,781 INFO L226 Difference]: Without dead ends: 917 [2018-12-03 19:28:08,782 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 268 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 19:28:08,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 917 states. [2018-12-03 19:28:08,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 917 to 917. [2018-12-03 19:28:08,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 917 states. [2018-12-03 19:28:08,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 917 states to 917 states and 977 transitions. [2018-12-03 19:28:08,811 INFO L78 Accepts]: Start accepts. Automaton has 917 states and 977 transitions. Word has length 154 [2018-12-03 19:28:08,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:08,811 INFO L480 AbstractCegarLoop]: Abstraction has 917 states and 977 transitions. [2018-12-03 19:28:08,811 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 19:28:08,811 INFO L276 IsEmpty]: Start isEmpty. Operand 917 states and 977 transitions. [2018-12-03 19:28:08,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-12-03 19:28:08,813 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:08,813 INFO L402 BasicCegarLoop]: trace histogram [76, 73, 4, 1, 1, 1] [2018-12-03 19:28:08,813 INFO L423 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:08,814 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:08,814 INFO L82 PathProgramCache]: Analyzing trace with hash 717430154, now seen corresponding path program 40 times [2018-12-03 19:28:08,814 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:08,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:08,815 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:08,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:08,815 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:08,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:10,351 INFO L134 CoverageAnalysis]: Checked inductivity of 5929 backedges. 3002 proven. 1521 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:10,351 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:10,351 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:10,351 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:10,351 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:10,351 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:10,352 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 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 19:28:10,361 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:28:10,361 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:28:10,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:10,424 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:10,443 INFO L134 CoverageAnalysis]: Checked inductivity of 5929 backedges. 3002 proven. 1521 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:10,443 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:12,375 INFO L134 CoverageAnalysis]: Checked inductivity of 5929 backedges. 3002 proven. 1521 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:12,394 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:12,394 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-12-03 19:28:12,394 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:12,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-12-03 19:28:12,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-12-03 19:28:12,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 19:28:12,396 INFO L87 Difference]: Start difference. First operand 917 states and 977 transitions. Second operand 42 states. [2018-12-03 19:28:12,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:12,471 INFO L93 Difference]: Finished difference Result 1756 states and 1876 transitions. [2018-12-03 19:28:12,471 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-12-03 19:28:12,472 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 156 [2018-12-03 19:28:12,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:12,476 INFO L225 Difference]: With dead ends: 1756 [2018-12-03 19:28:12,476 INFO L226 Difference]: Without dead ends: 919 [2018-12-03 19:28:12,478 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 271 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 19:28:12,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 919 states. [2018-12-03 19:28:12,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 919 to 919. [2018-12-03 19:28:12,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 919 states. [2018-12-03 19:28:12,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 919 states to 919 states and 979 transitions. [2018-12-03 19:28:12,507 INFO L78 Accepts]: Start accepts. Automaton has 919 states and 979 transitions. Word has length 156 [2018-12-03 19:28:12,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:12,508 INFO L480 AbstractCegarLoop]: Abstraction has 919 states and 979 transitions. [2018-12-03 19:28:12,508 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-12-03 19:28:12,508 INFO L276 IsEmpty]: Start isEmpty. Operand 919 states and 979 transitions. [2018-12-03 19:28:12,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-12-03 19:28:12,510 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:12,510 INFO L402 BasicCegarLoop]: trace histogram [77, 74, 4, 1, 1, 1] [2018-12-03 19:28:12,510 INFO L423 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:12,510 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:12,510 INFO L82 PathProgramCache]: Analyzing trace with hash -1612714876, now seen corresponding path program 41 times [2018-12-03 19:28:12,511 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:12,511 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:12,511 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:28:12,511 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:12,511 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:12,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:13,254 INFO L134 CoverageAnalysis]: Checked inductivity of 6084 backedges. 3078 proven. 1600 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:13,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:13,254 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:13,254 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:13,254 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:13,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:13,255 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 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 19:28:13,262 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:28:13,263 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:28:13,349 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-12-03 19:28:13,349 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:13,351 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:13,671 INFO L134 CoverageAnalysis]: Checked inductivity of 6084 backedges. 2176 proven. 110 refuted. 0 times theorem prover too weak. 3798 trivial. 0 not checked. [2018-12-03 19:28:13,672 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:14,041 INFO L134 CoverageAnalysis]: Checked inductivity of 6084 backedges. 2176 proven. 110 refuted. 0 times theorem prover too weak. 3798 trivial. 0 not checked. [2018-12-03 19:28:14,060 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:14,060 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 14, 14] total 67 [2018-12-03 19:28:14,060 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:14,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 19:28:14,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 19:28:14,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=3195, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 19:28:14,061 INFO L87 Difference]: Start difference. First operand 919 states and 979 transitions. Second operand 55 states. [2018-12-03 19:28:16,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:16,147 INFO L93 Difference]: Finished difference Result 1845 states and 1994 transitions. [2018-12-03 19:28:16,147 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-12-03 19:28:16,147 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 158 [2018-12-03 19:28:16,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:16,151 INFO L225 Difference]: With dead ends: 1845 [2018-12-03 19:28:16,151 INFO L226 Difference]: Without dead ends: 1008 [2018-12-03 19:28:16,153 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 291 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2630 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=4381, Invalid=9661, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 19:28:16,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1008 states. [2018-12-03 19:28:16,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1008 to 997. [2018-12-03 19:28:16,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 997 states. [2018-12-03 19:28:16,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 997 states to 997 states and 1059 transitions. [2018-12-03 19:28:16,185 INFO L78 Accepts]: Start accepts. Automaton has 997 states and 1059 transitions. Word has length 158 [2018-12-03 19:28:16,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:16,185 INFO L480 AbstractCegarLoop]: Abstraction has 997 states and 1059 transitions. [2018-12-03 19:28:16,185 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 19:28:16,185 INFO L276 IsEmpty]: Start isEmpty. Operand 997 states and 1059 transitions. [2018-12-03 19:28:16,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2018-12-03 19:28:16,187 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:16,187 INFO L402 BasicCegarLoop]: trace histogram [78, 75, 4, 1, 1, 1] [2018-12-03 19:28:16,188 INFO L423 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:16,188 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:16,188 INFO L82 PathProgramCache]: Analyzing trace with hash 819664894, now seen corresponding path program 42 times [2018-12-03 19:28:16,188 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:16,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:16,189 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:16,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:16,189 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:16,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:17,037 INFO L134 CoverageAnalysis]: Checked inductivity of 6241 backedges. 3154 proven. 1681 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:17,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:17,037 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:17,038 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:17,038 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:17,038 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:17,038 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:28:17,046 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:28:17,047 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:28:17,125 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:28:17,125 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:17,129 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:17,156 INFO L134 CoverageAnalysis]: Checked inductivity of 6241 backedges. 3154 proven. 1681 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:17,156 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:19,188 INFO L134 CoverageAnalysis]: Checked inductivity of 6241 backedges. 3154 proven. 1681 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:19,206 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:19,206 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2018-12-03 19:28:19,206 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:19,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 19:28:19,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 19:28:19,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 19:28:19,208 INFO L87 Difference]: Start difference. First operand 997 states and 1059 transitions. Second operand 44 states. [2018-12-03 19:28:19,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:19,338 INFO L93 Difference]: Finished difference Result 1912 states and 2036 transitions. [2018-12-03 19:28:19,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-03 19:28:19,338 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 160 [2018-12-03 19:28:19,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:19,342 INFO L225 Difference]: With dead ends: 1912 [2018-12-03 19:28:19,342 INFO L226 Difference]: Without dead ends: 999 [2018-12-03 19:28:19,343 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 277 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 19:28:19,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 999 states. [2018-12-03 19:28:19,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 999 to 999. [2018-12-03 19:28:19,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 999 states. [2018-12-03 19:28:19,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 999 states to 999 states and 1061 transitions. [2018-12-03 19:28:19,371 INFO L78 Accepts]: Start accepts. Automaton has 999 states and 1061 transitions. Word has length 160 [2018-12-03 19:28:19,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:19,371 INFO L480 AbstractCegarLoop]: Abstraction has 999 states and 1061 transitions. [2018-12-03 19:28:19,371 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 19:28:19,371 INFO L276 IsEmpty]: Start isEmpty. Operand 999 states and 1061 transitions. [2018-12-03 19:28:19,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2018-12-03 19:28:19,373 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:19,374 INFO L402 BasicCegarLoop]: trace histogram [79, 76, 4, 1, 1, 1] [2018-12-03 19:28:19,374 INFO L423 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:19,374 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:19,374 INFO L82 PathProgramCache]: Analyzing trace with hash 480500216, now seen corresponding path program 43 times [2018-12-03 19:28:19,374 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:19,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:19,375 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:19,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:19,375 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:19,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:20,227 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 3230 proven. 1764 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:20,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:20,228 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:20,228 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:20,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:20,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:20,228 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:28:20,236 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:28:20,236 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:28:20,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:20,300 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:20,325 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 3230 proven. 1764 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:20,326 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:22,572 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 3230 proven. 1764 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:22,591 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:22,592 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2018-12-03 19:28:22,592 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:22,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-12-03 19:28:22,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-12-03 19:28:22,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2018-12-03 19:28:22,593 INFO L87 Difference]: Start difference. First operand 999 states and 1061 transitions. Second operand 45 states. [2018-12-03 19:28:22,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:22,712 INFO L93 Difference]: Finished difference Result 1914 states and 2038 transitions. [2018-12-03 19:28:22,713 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 19:28:22,713 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 162 [2018-12-03 19:28:22,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:22,717 INFO L225 Difference]: With dead ends: 1914 [2018-12-03 19:28:22,717 INFO L226 Difference]: Without dead ends: 1001 [2018-12-03 19:28:22,718 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 280 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2018-12-03 19:28:22,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1001 states. [2018-12-03 19:28:22,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1001 to 1001. [2018-12-03 19:28:22,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1001 states. [2018-12-03 19:28:22,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1001 states to 1001 states and 1063 transitions. [2018-12-03 19:28:22,747 INFO L78 Accepts]: Start accepts. Automaton has 1001 states and 1063 transitions. Word has length 162 [2018-12-03 19:28:22,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:22,747 INFO L480 AbstractCegarLoop]: Abstraction has 1001 states and 1063 transitions. [2018-12-03 19:28:22,748 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-12-03 19:28:22,748 INFO L276 IsEmpty]: Start isEmpty. Operand 1001 states and 1063 transitions. [2018-12-03 19:28:22,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-12-03 19:28:22,750 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:22,750 INFO L402 BasicCegarLoop]: trace histogram [80, 77, 4, 1, 1, 1] [2018-12-03 19:28:22,750 INFO L423 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:22,750 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:22,750 INFO L82 PathProgramCache]: Analyzing trace with hash 960759154, now seen corresponding path program 44 times [2018-12-03 19:28:22,751 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:22,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:22,751 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:28:22,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:22,751 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:22,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:23,920 INFO L134 CoverageAnalysis]: Checked inductivity of 6561 backedges. 3306 proven. 1849 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:23,920 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:23,920 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:23,920 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:23,920 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:23,920 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:23,920 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 19:28:23,929 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:28:23,929 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:28:23,974 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-12-03 19:28:23,974 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:23,976 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:24,327 INFO L134 CoverageAnalysis]: Checked inductivity of 6561 backedges. 2006 proven. 132 refuted. 0 times theorem prover too weak. 4423 trivial. 0 not checked. [2018-12-03 19:28:24,327 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:24,866 INFO L134 CoverageAnalysis]: Checked inductivity of 6561 backedges. 2006 proven. 132 refuted. 0 times theorem prover too weak. 4423 trivial. 0 not checked. [2018-12-03 19:28:24,884 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:24,884 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 15, 15] total 72 [2018-12-03 19:28:24,884 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:24,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 19:28:24,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 19:28:24,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1412, Invalid=3700, Unknown=0, NotChecked=0, Total=5112 [2018-12-03 19:28:24,885 INFO L87 Difference]: Start difference. First operand 1001 states and 1063 transitions. Second operand 59 states. [2018-12-03 19:28:28,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:28,884 INFO L93 Difference]: Finished difference Result 2004 states and 2156 transitions. [2018-12-03 19:28:28,884 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 19:28:28,884 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 164 [2018-12-03 19:28:28,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:28,888 INFO L225 Difference]: With dead ends: 2004 [2018-12-03 19:28:28,888 INFO L226 Difference]: Without dead ends: 1091 [2018-12-03 19:28:28,889 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 427 GetRequests, 301 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3058 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=5060, Invalid=11196, Unknown=0, NotChecked=0, Total=16256 [2018-12-03 19:28:28,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1091 states. [2018-12-03 19:28:28,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1091 to 1079. [2018-12-03 19:28:28,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1079 states. [2018-12-03 19:28:28,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1079 states to 1079 states and 1143 transitions. [2018-12-03 19:28:28,917 INFO L78 Accepts]: Start accepts. Automaton has 1079 states and 1143 transitions. Word has length 164 [2018-12-03 19:28:28,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:28,917 INFO L480 AbstractCegarLoop]: Abstraction has 1079 states and 1143 transitions. [2018-12-03 19:28:28,917 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 19:28:28,917 INFO L276 IsEmpty]: Start isEmpty. Operand 1079 states and 1143 transitions. [2018-12-03 19:28:28,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-12-03 19:28:28,919 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:28,920 INFO L402 BasicCegarLoop]: trace histogram [81, 79, 3, 1, 1, 1] [2018-12-03 19:28:28,920 INFO L423 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:28,920 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:28,920 INFO L82 PathProgramCache]: Analyzing trace with hash 277150890, now seen corresponding path program 45 times [2018-12-03 19:28:28,920 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:28,921 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:28,921 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:28,921 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:28,921 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:28,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:30,539 INFO L134 CoverageAnalysis]: Checked inductivity of 6724 backedges. 3382 proven. 1936 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:30,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:30,539 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:30,539 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:30,539 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:30,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:30,539 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 19:28:30,551 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:28:30,551 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:28:30,621 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:28:30,622 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:30,625 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:30,651 INFO L134 CoverageAnalysis]: Checked inductivity of 6724 backedges. 3382 proven. 1936 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:30,651 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:33,262 INFO L134 CoverageAnalysis]: Checked inductivity of 6724 backedges. 3382 proven. 1936 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:33,281 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:33,281 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 91 [2018-12-03 19:28:33,281 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:33,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 19:28:33,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 19:28:33,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 19:28:33,282 INFO L87 Difference]: Start difference. First operand 1079 states and 1143 transitions. Second operand 47 states. [2018-12-03 19:28:33,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:33,370 INFO L93 Difference]: Finished difference Result 2070 states and 2198 transitions. [2018-12-03 19:28:33,371 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 19:28:33,371 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 166 [2018-12-03 19:28:33,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:33,374 INFO L225 Difference]: With dead ends: 2070 [2018-12-03 19:28:33,374 INFO L226 Difference]: Without dead ends: 1081 [2018-12-03 19:28:33,375 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 286 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 19:28:33,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1081 states. [2018-12-03 19:28:33,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1081 to 1081. [2018-12-03 19:28:33,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1081 states. [2018-12-03 19:28:33,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1081 states to 1081 states and 1145 transitions. [2018-12-03 19:28:33,398 INFO L78 Accepts]: Start accepts. Automaton has 1081 states and 1145 transitions. Word has length 166 [2018-12-03 19:28:33,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:33,398 INFO L480 AbstractCegarLoop]: Abstraction has 1081 states and 1145 transitions. [2018-12-03 19:28:33,398 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 19:28:33,399 INFO L276 IsEmpty]: Start isEmpty. Operand 1081 states and 1145 transitions. [2018-12-03 19:28:33,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-12-03 19:28:33,400 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:33,401 INFO L402 BasicCegarLoop]: trace histogram [82, 80, 3, 1, 1, 1] [2018-12-03 19:28:33,401 INFO L423 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:33,401 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:33,401 INFO L82 PathProgramCache]: Analyzing trace with hash 1104075556, now seen corresponding path program 46 times [2018-12-03 19:28:33,401 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:33,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:33,402 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:33,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:33,402 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:33,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:34,367 INFO L134 CoverageAnalysis]: Checked inductivity of 6889 backedges. 3458 proven. 2025 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:34,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:34,367 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:34,367 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:34,367 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:34,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:34,367 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 19:28:34,376 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:28:34,376 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:28:34,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:34,445 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:34,473 INFO L134 CoverageAnalysis]: Checked inductivity of 6889 backedges. 3458 proven. 2025 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:34,473 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:36,797 INFO L134 CoverageAnalysis]: Checked inductivity of 6889 backedges. 3458 proven. 2025 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:36,815 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:36,815 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-12-03 19:28:36,815 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:36,816 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-12-03 19:28:36,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-12-03 19:28:36,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 19:28:36,817 INFO L87 Difference]: Start difference. First operand 1081 states and 1145 transitions. Second operand 48 states. [2018-12-03 19:28:36,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:36,941 INFO L93 Difference]: Finished difference Result 2072 states and 2200 transitions. [2018-12-03 19:28:36,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-12-03 19:28:36,941 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 168 [2018-12-03 19:28:36,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:36,944 INFO L225 Difference]: With dead ends: 2072 [2018-12-03 19:28:36,944 INFO L226 Difference]: Without dead ends: 1083 [2018-12-03 19:28:36,946 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 289 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 19:28:36,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1083 states. [2018-12-03 19:28:36,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1083 to 1083. [2018-12-03 19:28:36,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1083 states. [2018-12-03 19:28:36,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1083 states to 1083 states and 1147 transitions. [2018-12-03 19:28:36,968 INFO L78 Accepts]: Start accepts. Automaton has 1083 states and 1147 transitions. Word has length 168 [2018-12-03 19:28:36,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:36,968 INFO L480 AbstractCegarLoop]: Abstraction has 1083 states and 1147 transitions. [2018-12-03 19:28:36,968 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-12-03 19:28:36,969 INFO L276 IsEmpty]: Start isEmpty. Operand 1083 states and 1147 transitions. [2018-12-03 19:28:36,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-12-03 19:28:36,970 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:36,970 INFO L402 BasicCegarLoop]: trace histogram [83, 81, 3, 1, 1, 1] [2018-12-03 19:28:36,971 INFO L423 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:36,971 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:36,971 INFO L82 PathProgramCache]: Analyzing trace with hash 1209729822, now seen corresponding path program 47 times [2018-12-03 19:28:36,971 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:36,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:36,972 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:28:36,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:36,972 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:36,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:38,117 INFO L134 CoverageAnalysis]: Checked inductivity of 7056 backedges. 3534 proven. 2116 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:38,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:38,117 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:38,117 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:38,117 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:38,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:38,117 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 19:28:38,125 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:28:38,125 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:28:38,193 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2018-12-03 19:28:38,193 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:38,196 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:38,940 INFO L134 CoverageAnalysis]: Checked inductivity of 7056 backedges. 3357 proven. 156 refuted. 0 times theorem prover too weak. 3543 trivial. 0 not checked. [2018-12-03 19:28:38,940 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:39,367 INFO L134 CoverageAnalysis]: Checked inductivity of 7056 backedges. 3357 proven. 156 refuted. 0 times theorem prover too weak. 3543 trivial. 0 not checked. [2018-12-03 19:28:39,386 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:39,386 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 16, 16] total 77 [2018-12-03 19:28:39,386 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:39,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-12-03 19:28:39,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-12-03 19:28:39,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1610, Invalid=4242, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 19:28:39,387 INFO L87 Difference]: Start difference. First operand 1083 states and 1147 transitions. Second operand 63 states. [2018-12-03 19:28:41,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:41,995 INFO L93 Difference]: Finished difference Result 2163 states and 2318 transitions. [2018-12-03 19:28:41,995 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-12-03 19:28:41,995 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 170 [2018-12-03 19:28:41,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:41,999 INFO L225 Difference]: With dead ends: 2163 [2018-12-03 19:28:41,999 INFO L226 Difference]: Without dead ends: 1174 [2018-12-03 19:28:42,001 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 311 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3518 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=5788, Invalid=12844, Unknown=0, NotChecked=0, Total=18632 [2018-12-03 19:28:42,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1174 states. [2018-12-03 19:28:42,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1174 to 1161. [2018-12-03 19:28:42,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1161 states. [2018-12-03 19:28:42,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1161 states to 1161 states and 1227 transitions. [2018-12-03 19:28:42,024 INFO L78 Accepts]: Start accepts. Automaton has 1161 states and 1227 transitions. Word has length 170 [2018-12-03 19:28:42,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:42,024 INFO L480 AbstractCegarLoop]: Abstraction has 1161 states and 1227 transitions. [2018-12-03 19:28:42,024 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-12-03 19:28:42,025 INFO L276 IsEmpty]: Start isEmpty. Operand 1161 states and 1227 transitions. [2018-12-03 19:28:42,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2018-12-03 19:28:42,026 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:42,026 INFO L402 BasicCegarLoop]: trace histogram [84, 82, 3, 1, 1, 1] [2018-12-03 19:28:42,026 INFO L423 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:42,026 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:42,026 INFO L82 PathProgramCache]: Analyzing trace with hash -2072343016, now seen corresponding path program 48 times [2018-12-03 19:28:42,027 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:42,027 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:42,027 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:42,027 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:42,028 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:42,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:43,242 INFO L134 CoverageAnalysis]: Checked inductivity of 7225 backedges. 3610 proven. 2209 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:43,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:43,242 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:43,242 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:43,242 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:43,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:43,242 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:28:43,251 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:28:43,251 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:28:43,318 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:28:43,318 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:43,322 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:43,344 INFO L134 CoverageAnalysis]: Checked inductivity of 7225 backedges. 3610 proven. 2209 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:43,344 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:45,766 INFO L134 CoverageAnalysis]: Checked inductivity of 7225 backedges. 3610 proven. 2209 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:45,785 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:45,785 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2018-12-03 19:28:45,785 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:45,785 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 19:28:45,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 19:28:45,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 19:28:45,786 INFO L87 Difference]: Start difference. First operand 1161 states and 1227 transitions. Second operand 50 states. [2018-12-03 19:28:45,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:45,895 INFO L93 Difference]: Finished difference Result 2228 states and 2360 transitions. [2018-12-03 19:28:45,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-12-03 19:28:45,895 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 172 [2018-12-03 19:28:45,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:45,899 INFO L225 Difference]: With dead ends: 2228 [2018-12-03 19:28:45,899 INFO L226 Difference]: Without dead ends: 1163 [2018-12-03 19:28:45,900 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 295 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 19:28:45,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1163 states. [2018-12-03 19:28:45,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1163 to 1163. [2018-12-03 19:28:45,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1163 states. [2018-12-03 19:28:45,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1163 states to 1163 states and 1229 transitions. [2018-12-03 19:28:45,923 INFO L78 Accepts]: Start accepts. Automaton has 1163 states and 1229 transitions. Word has length 172 [2018-12-03 19:28:45,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:45,924 INFO L480 AbstractCegarLoop]: Abstraction has 1163 states and 1229 transitions. [2018-12-03 19:28:45,924 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 19:28:45,924 INFO L276 IsEmpty]: Start isEmpty. Operand 1163 states and 1229 transitions. [2018-12-03 19:28:45,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-12-03 19:28:45,926 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:45,926 INFO L402 BasicCegarLoop]: trace histogram [85, 83, 3, 1, 1, 1] [2018-12-03 19:28:45,926 INFO L423 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:45,926 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:45,926 INFO L82 PathProgramCache]: Analyzing trace with hash -1205982958, now seen corresponding path program 49 times [2018-12-03 19:28:45,926 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:45,927 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:45,927 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:45,927 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:45,927 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:45,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:47,242 INFO L134 CoverageAnalysis]: Checked inductivity of 7396 backedges. 3686 proven. 2304 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:47,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:47,242 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:47,242 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:47,242 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:47,243 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:47,243 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 19:28:47,251 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:28:47,251 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:28:47,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:47,322 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:47,353 INFO L134 CoverageAnalysis]: Checked inductivity of 7396 backedges. 3686 proven. 2304 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:47,353 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:49,865 INFO L134 CoverageAnalysis]: Checked inductivity of 7396 backedges. 3686 proven. 2304 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:49,884 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:49,884 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 99 [2018-12-03 19:28:49,884 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:49,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-12-03 19:28:49,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-12-03 19:28:49,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4950, Invalid=4950, Unknown=0, NotChecked=0, Total=9900 [2018-12-03 19:28:49,885 INFO L87 Difference]: Start difference. First operand 1163 states and 1229 transitions. Second operand 51 states. [2018-12-03 19:28:50,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:50,023 INFO L93 Difference]: Finished difference Result 2230 states and 2362 transitions. [2018-12-03 19:28:50,024 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-12-03 19:28:50,024 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 174 [2018-12-03 19:28:50,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:50,027 INFO L225 Difference]: With dead ends: 2230 [2018-12-03 19:28:50,027 INFO L226 Difference]: Without dead ends: 1165 [2018-12-03 19:28:50,028 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 298 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=4950, Invalid=4950, Unknown=0, NotChecked=0, Total=9900 [2018-12-03 19:28:50,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1165 states. [2018-12-03 19:28:50,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1165 to 1165. [2018-12-03 19:28:50,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1165 states. [2018-12-03 19:28:50,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1165 states to 1165 states and 1231 transitions. [2018-12-03 19:28:50,051 INFO L78 Accepts]: Start accepts. Automaton has 1165 states and 1231 transitions. Word has length 174 [2018-12-03 19:28:50,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:50,052 INFO L480 AbstractCegarLoop]: Abstraction has 1165 states and 1231 transitions. [2018-12-03 19:28:50,052 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-12-03 19:28:50,052 INFO L276 IsEmpty]: Start isEmpty. Operand 1165 states and 1231 transitions. [2018-12-03 19:28:50,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-12-03 19:28:50,053 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:50,053 INFO L402 BasicCegarLoop]: trace histogram [86, 84, 3, 1, 1, 1] [2018-12-03 19:28:50,053 INFO L423 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:50,054 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:50,054 INFO L82 PathProgramCache]: Analyzing trace with hash -1857622644, now seen corresponding path program 50 times [2018-12-03 19:28:50,054 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:50,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:50,054 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:28:50,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:50,055 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:50,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:51,115 INFO L134 CoverageAnalysis]: Checked inductivity of 7569 backedges. 3762 proven. 2401 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:51,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:51,115 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:51,115 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:51,115 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:51,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:51,115 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 19:28:51,125 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:28:51,125 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:28:51,193 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-12-03 19:28:51,194 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:51,197 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:51,576 INFO L134 CoverageAnalysis]: Checked inductivity of 7569 backedges. 3400 proven. 182 refuted. 0 times theorem prover too weak. 3987 trivial. 0 not checked. [2018-12-03 19:28:51,576 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:52,390 INFO L134 CoverageAnalysis]: Checked inductivity of 7569 backedges. 3400 proven. 182 refuted. 0 times theorem prover too weak. 3987 trivial. 0 not checked. [2018-12-03 19:28:52,409 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:52,409 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 17, 17] total 82 [2018-12-03 19:28:52,409 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:52,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-12-03 19:28:52,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-12-03 19:28:52,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1821, Invalid=4821, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 19:28:52,411 INFO L87 Difference]: Start difference. First operand 1165 states and 1231 transitions. Second operand 67 states. [2018-12-03 19:28:54,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:54,804 INFO L93 Difference]: Finished difference Result 2322 states and 2480 transitions. [2018-12-03 19:28:54,804 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 19:28:54,804 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 176 [2018-12-03 19:28:54,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:54,808 INFO L225 Difference]: With dead ends: 2322 [2018-12-03 19:28:54,808 INFO L226 Difference]: Without dead ends: 1257 [2018-12-03 19:28:54,810 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 321 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4010 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=6565, Invalid=14605, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 19:28:54,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1257 states. [2018-12-03 19:28:54,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1257 to 1243. [2018-12-03 19:28:54,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1243 states. [2018-12-03 19:28:54,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1243 states to 1243 states and 1311 transitions. [2018-12-03 19:28:54,835 INFO L78 Accepts]: Start accepts. Automaton has 1243 states and 1311 transitions. Word has length 176 [2018-12-03 19:28:54,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:54,835 INFO L480 AbstractCegarLoop]: Abstraction has 1243 states and 1311 transitions. [2018-12-03 19:28:54,835 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-12-03 19:28:54,835 INFO L276 IsEmpty]: Start isEmpty. Operand 1243 states and 1311 transitions. [2018-12-03 19:28:54,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2018-12-03 19:28:54,836 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:54,837 INFO L402 BasicCegarLoop]: trace histogram [87, 85, 3, 1, 1, 1] [2018-12-03 19:28:54,837 INFO L423 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:54,837 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:54,837 INFO L82 PathProgramCache]: Analyzing trace with hash -803826426, now seen corresponding path program 51 times [2018-12-03 19:28:54,837 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:54,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:54,838 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:54,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:54,838 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:54,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:28:56,044 INFO L134 CoverageAnalysis]: Checked inductivity of 7744 backedges. 3838 proven. 2500 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:56,045 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:56,045 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:28:56,045 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:28:56,045 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:28:56,045 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:28:56,045 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 19:28:56,053 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:28:56,053 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:28:56,121 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:28:56,122 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:28:56,125 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:28:56,148 INFO L134 CoverageAnalysis]: Checked inductivity of 7744 backedges. 3838 proven. 2500 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:56,148 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:28:59,136 INFO L134 CoverageAnalysis]: Checked inductivity of 7744 backedges. 3838 proven. 2500 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:28:59,155 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:28:59,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2018-12-03 19:28:59,155 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:28:59,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 19:28:59,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 19:28:59,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2018-12-03 19:28:59,157 INFO L87 Difference]: Start difference. First operand 1243 states and 1311 transitions. Second operand 53 states. [2018-12-03 19:28:59,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:28:59,248 INFO L93 Difference]: Finished difference Result 2386 states and 2522 transitions. [2018-12-03 19:28:59,248 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 19:28:59,248 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 178 [2018-12-03 19:28:59,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:28:59,251 INFO L225 Difference]: With dead ends: 2386 [2018-12-03 19:28:59,251 INFO L226 Difference]: Without dead ends: 1245 [2018-12-03 19:28:59,253 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 304 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2018-12-03 19:28:59,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1245 states. [2018-12-03 19:28:59,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1245 to 1245. [2018-12-03 19:28:59,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1245 states. [2018-12-03 19:28:59,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1245 states to 1245 states and 1313 transitions. [2018-12-03 19:28:59,278 INFO L78 Accepts]: Start accepts. Automaton has 1245 states and 1313 transitions. Word has length 178 [2018-12-03 19:28:59,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:28:59,278 INFO L480 AbstractCegarLoop]: Abstraction has 1245 states and 1313 transitions. [2018-12-03 19:28:59,278 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 19:28:59,278 INFO L276 IsEmpty]: Start isEmpty. Operand 1245 states and 1313 transitions. [2018-12-03 19:28:59,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2018-12-03 19:28:59,279 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:28:59,279 INFO L402 BasicCegarLoop]: trace histogram [88, 86, 3, 1, 1, 1] [2018-12-03 19:28:59,280 INFO L423 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:28:59,280 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:28:59,280 INFO L82 PathProgramCache]: Analyzing trace with hash -1510699904, now seen corresponding path program 52 times [2018-12-03 19:28:59,280 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:28:59,280 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:59,280 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:28:59,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:28:59,281 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:28:59,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:00,415 INFO L134 CoverageAnalysis]: Checked inductivity of 7921 backedges. 3914 proven. 2601 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:00,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:00,415 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:00,415 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:00,415 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:00,416 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:00,416 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 19:29:00,425 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:29:00,425 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:29:00,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:00,496 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:00,530 INFO L134 CoverageAnalysis]: Checked inductivity of 7921 backedges. 3914 proven. 2601 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:00,530 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:03,914 INFO L134 CoverageAnalysis]: Checked inductivity of 7921 backedges. 3914 proven. 2601 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:03,932 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:03,932 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-12-03 19:29:03,933 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:03,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-12-03 19:29:03,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-12-03 19:29:03,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 19:29:03,934 INFO L87 Difference]: Start difference. First operand 1245 states and 1313 transitions. Second operand 54 states. [2018-12-03 19:29:04,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:04,051 INFO L93 Difference]: Finished difference Result 2388 states and 2524 transitions. [2018-12-03 19:29:04,051 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-03 19:29:04,052 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 180 [2018-12-03 19:29:04,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:04,055 INFO L225 Difference]: With dead ends: 2388 [2018-12-03 19:29:04,055 INFO L226 Difference]: Without dead ends: 1247 [2018-12-03 19:29:04,056 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 307 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 19:29:04,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1247 states. [2018-12-03 19:29:04,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1247 to 1247. [2018-12-03 19:29:04,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1247 states. [2018-12-03 19:29:04,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1247 states to 1247 states and 1315 transitions. [2018-12-03 19:29:04,081 INFO L78 Accepts]: Start accepts. Automaton has 1247 states and 1315 transitions. Word has length 180 [2018-12-03 19:29:04,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:04,081 INFO L480 AbstractCegarLoop]: Abstraction has 1247 states and 1315 transitions. [2018-12-03 19:29:04,082 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-12-03 19:29:04,082 INFO L276 IsEmpty]: Start isEmpty. Operand 1247 states and 1315 transitions. [2018-12-03 19:29:04,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-12-03 19:29:04,083 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:04,083 INFO L402 BasicCegarLoop]: trace histogram [89, 87, 3, 1, 1, 1] [2018-12-03 19:29:04,083 INFO L423 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:04,083 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:04,083 INFO L82 PathProgramCache]: Analyzing trace with hash 2083687802, now seen corresponding path program 53 times [2018-12-03 19:29:04,084 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:04,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:04,084 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:29:04,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:04,084 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:04,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:05,175 INFO L134 CoverageAnalysis]: Checked inductivity of 8100 backedges. 3990 proven. 2704 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:05,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:05,176 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:05,176 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:05,176 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:05,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:05,176 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 19:29:05,185 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:29:05,185 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:29:05,267 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-12-03 19:29:05,267 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:29:05,269 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:05,963 INFO L134 CoverageAnalysis]: Checked inductivity of 8100 backedges. 3419 proven. 210 refuted. 0 times theorem prover too weak. 4471 trivial. 0 not checked. [2018-12-03 19:29:05,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:06,559 INFO L134 CoverageAnalysis]: Checked inductivity of 8100 backedges. 3419 proven. 210 refuted. 0 times theorem prover too weak. 4471 trivial. 0 not checked. [2018-12-03 19:29:06,578 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:06,578 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 18, 18] total 87 [2018-12-03 19:29:06,578 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:06,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 19:29:06,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 19:29:06,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2045, Invalid=5437, Unknown=0, NotChecked=0, Total=7482 [2018-12-03 19:29:06,579 INFO L87 Difference]: Start difference. First operand 1247 states and 1315 transitions. Second operand 71 states. [2018-12-03 19:29:09,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:09,514 INFO L93 Difference]: Finished difference Result 2481 states and 2642 transitions. [2018-12-03 19:29:09,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-12-03 19:29:09,514 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 182 [2018-12-03 19:29:09,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:09,518 INFO L225 Difference]: With dead ends: 2481 [2018-12-03 19:29:09,518 INFO L226 Difference]: Without dead ends: 1340 [2018-12-03 19:29:09,520 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 331 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4534 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=7391, Invalid=16479, Unknown=0, NotChecked=0, Total=23870 [2018-12-03 19:29:09,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1340 states. [2018-12-03 19:29:09,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1340 to 1325. [2018-12-03 19:29:09,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1325 states. [2018-12-03 19:29:09,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1325 states to 1325 states and 1395 transitions. [2018-12-03 19:29:09,547 INFO L78 Accepts]: Start accepts. Automaton has 1325 states and 1395 transitions. Word has length 182 [2018-12-03 19:29:09,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:09,547 INFO L480 AbstractCegarLoop]: Abstraction has 1325 states and 1395 transitions. [2018-12-03 19:29:09,547 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 19:29:09,547 INFO L276 IsEmpty]: Start isEmpty. Operand 1325 states and 1395 transitions. [2018-12-03 19:29:09,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2018-12-03 19:29:09,549 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:09,549 INFO L402 BasicCegarLoop]: trace histogram [90, 88, 3, 1, 1, 1] [2018-12-03 19:29:09,549 INFO L423 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:09,549 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:09,549 INFO L82 PathProgramCache]: Analyzing trace with hash 1540026740, now seen corresponding path program 54 times [2018-12-03 19:29:09,549 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:09,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:09,550 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:29:09,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:09,550 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:09,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:10,638 INFO L134 CoverageAnalysis]: Checked inductivity of 8281 backedges. 4066 proven. 2809 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:10,638 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:10,638 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:10,639 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:10,639 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:10,639 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:10,639 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:29:10,648 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:29:10,648 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:29:10,718 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:29:10,718 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:29:10,721 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:10,755 INFO L134 CoverageAnalysis]: Checked inductivity of 8281 backedges. 4066 proven. 2809 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:10,756 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:14,007 INFO L134 CoverageAnalysis]: Checked inductivity of 8281 backedges. 4066 proven. 2809 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:14,025 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:14,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 109 [2018-12-03 19:29:14,026 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:14,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-12-03 19:29:14,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-12-03 19:29:14,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5995, Invalid=5995, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 19:29:14,027 INFO L87 Difference]: Start difference. First operand 1325 states and 1395 transitions. Second operand 56 states. [2018-12-03 19:29:14,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:14,148 INFO L93 Difference]: Finished difference Result 2544 states and 2684 transitions. [2018-12-03 19:29:14,148 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-12-03 19:29:14,148 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 184 [2018-12-03 19:29:14,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:14,152 INFO L225 Difference]: With dead ends: 2544 [2018-12-03 19:29:14,152 INFO L226 Difference]: Without dead ends: 1327 [2018-12-03 19:29:14,153 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 313 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=5995, Invalid=5995, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 19:29:14,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1327 states. [2018-12-03 19:29:14,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1327 to 1327. [2018-12-03 19:29:14,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1327 states. [2018-12-03 19:29:14,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1327 states to 1327 states and 1397 transitions. [2018-12-03 19:29:14,180 INFO L78 Accepts]: Start accepts. Automaton has 1327 states and 1397 transitions. Word has length 184 [2018-12-03 19:29:14,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:14,180 INFO L480 AbstractCegarLoop]: Abstraction has 1327 states and 1397 transitions. [2018-12-03 19:29:14,180 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-12-03 19:29:14,180 INFO L276 IsEmpty]: Start isEmpty. Operand 1327 states and 1397 transitions. [2018-12-03 19:29:14,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-12-03 19:29:14,181 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:14,181 INFO L402 BasicCegarLoop]: trace histogram [91, 89, 3, 1, 1, 1] [2018-12-03 19:29:14,182 INFO L423 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:14,182 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:14,182 INFO L82 PathProgramCache]: Analyzing trace with hash -255072914, now seen corresponding path program 55 times [2018-12-03 19:29:14,182 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:14,182 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:14,182 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:29:14,182 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:14,183 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:14,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:15,327 INFO L134 CoverageAnalysis]: Checked inductivity of 8464 backedges. 4142 proven. 2916 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:15,328 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:15,328 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:15,328 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:15,328 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:15,328 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:15,328 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 19:29:15,338 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:29:15,338 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:29:15,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:15,420 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:15,458 INFO L134 CoverageAnalysis]: Checked inductivity of 8464 backedges. 4142 proven. 2916 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:15,458 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:19,106 INFO L134 CoverageAnalysis]: Checked inductivity of 8464 backedges. 4142 proven. 2916 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:19,124 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:19,124 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 111 [2018-12-03 19:29:19,124 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:19,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-12-03 19:29:19,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-12-03 19:29:19,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6216, Invalid=6216, Unknown=0, NotChecked=0, Total=12432 [2018-12-03 19:29:19,126 INFO L87 Difference]: Start difference. First operand 1327 states and 1397 transitions. Second operand 57 states. [2018-12-03 19:29:19,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:19,226 INFO L93 Difference]: Finished difference Result 2546 states and 2686 transitions. [2018-12-03 19:29:19,226 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 19:29:19,226 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 186 [2018-12-03 19:29:19,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:19,230 INFO L225 Difference]: With dead ends: 2546 [2018-12-03 19:29:19,231 INFO L226 Difference]: Without dead ends: 1329 [2018-12-03 19:29:19,232 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 316 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=6216, Invalid=6216, Unknown=0, NotChecked=0, Total=12432 [2018-12-03 19:29:19,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1329 states. [2018-12-03 19:29:19,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1329 to 1329. [2018-12-03 19:29:19,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1329 states. [2018-12-03 19:29:19,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1329 states to 1329 states and 1399 transitions. [2018-12-03 19:29:19,256 INFO L78 Accepts]: Start accepts. Automaton has 1329 states and 1399 transitions. Word has length 186 [2018-12-03 19:29:19,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:19,256 INFO L480 AbstractCegarLoop]: Abstraction has 1329 states and 1399 transitions. [2018-12-03 19:29:19,256 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-12-03 19:29:19,256 INFO L276 IsEmpty]: Start isEmpty. Operand 1329 states and 1399 transitions. [2018-12-03 19:29:19,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-12-03 19:29:19,257 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:19,258 INFO L402 BasicCegarLoop]: trace histogram [92, 90, 3, 1, 1, 1] [2018-12-03 19:29:19,258 INFO L423 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:19,258 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:19,258 INFO L82 PathProgramCache]: Analyzing trace with hash 1231012584, now seen corresponding path program 56 times [2018-12-03 19:29:19,258 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:19,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:19,259 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:29:19,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:19,259 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:19,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:20,595 INFO L134 CoverageAnalysis]: Checked inductivity of 8649 backedges. 4218 proven. 3025 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:20,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:20,596 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:20,596 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:20,596 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:20,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:20,596 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 19:29:20,606 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:29:20,606 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:29:20,664 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2018-12-03 19:29:20,665 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:29:20,667 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:21,159 INFO L134 CoverageAnalysis]: Checked inductivity of 8649 backedges. 3414 proven. 240 refuted. 0 times theorem prover too weak. 4995 trivial. 0 not checked. [2018-12-03 19:29:21,159 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:21,843 INFO L134 CoverageAnalysis]: Checked inductivity of 8649 backedges. 3414 proven. 240 refuted. 0 times theorem prover too weak. 4995 trivial. 0 not checked. [2018-12-03 19:29:21,872 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:21,872 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 19, 19] total 92 [2018-12-03 19:29:21,872 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:21,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-12-03 19:29:21,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-12-03 19:29:21,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2282, Invalid=6090, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 19:29:21,874 INFO L87 Difference]: Start difference. First operand 1329 states and 1399 transitions. Second operand 75 states. [2018-12-03 19:29:25,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:25,018 INFO L93 Difference]: Finished difference Result 2640 states and 2804 transitions. [2018-12-03 19:29:25,018 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 19:29:25,018 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 188 [2018-12-03 19:29:25,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:25,022 INFO L225 Difference]: With dead ends: 2640 [2018-12-03 19:29:25,022 INFO L226 Difference]: Without dead ends: 1423 [2018-12-03 19:29:25,025 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 341 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5090 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=8266, Invalid=18466, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 19:29:25,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1423 states. [2018-12-03 19:29:25,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1423 to 1407. [2018-12-03 19:29:25,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1407 states. [2018-12-03 19:29:25,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1407 states to 1407 states and 1479 transitions. [2018-12-03 19:29:25,053 INFO L78 Accepts]: Start accepts. Automaton has 1407 states and 1479 transitions. Word has length 188 [2018-12-03 19:29:25,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:25,053 INFO L480 AbstractCegarLoop]: Abstraction has 1407 states and 1479 transitions. [2018-12-03 19:29:25,053 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-12-03 19:29:25,053 INFO L276 IsEmpty]: Start isEmpty. Operand 1407 states and 1479 transitions. [2018-12-03 19:29:25,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2018-12-03 19:29:25,055 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:25,055 INFO L402 BasicCegarLoop]: trace histogram [93, 91, 3, 1, 1, 1] [2018-12-03 19:29:25,055 INFO L423 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:25,055 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:25,055 INFO L82 PathProgramCache]: Analyzing trace with hash -2094955678, now seen corresponding path program 57 times [2018-12-03 19:29:25,055 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:25,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:25,056 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:29:25,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:25,056 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:25,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:26,293 INFO L134 CoverageAnalysis]: Checked inductivity of 8836 backedges. 4294 proven. 3136 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:26,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:26,293 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:26,293 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:26,293 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:26,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:26,294 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 19:29:26,301 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:29:26,301 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:29:26,372 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:29:26,372 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:29:26,375 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:26,403 INFO L134 CoverageAnalysis]: Checked inductivity of 8836 backedges. 4294 proven. 3136 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:26,403 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:30,012 INFO L134 CoverageAnalysis]: Checked inductivity of 8836 backedges. 4294 proven. 3136 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:30,031 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:30,032 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 115 [2018-12-03 19:29:30,032 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:30,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 19:29:30,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 19:29:30,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6670, Invalid=6670, Unknown=0, NotChecked=0, Total=13340 [2018-12-03 19:29:30,034 INFO L87 Difference]: Start difference. First operand 1407 states and 1479 transitions. Second operand 59 states. [2018-12-03 19:29:30,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:30,189 INFO L93 Difference]: Finished difference Result 2702 states and 2846 transitions. [2018-12-03 19:29:30,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 19:29:30,189 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 190 [2018-12-03 19:29:30,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:30,193 INFO L225 Difference]: With dead ends: 2702 [2018-12-03 19:29:30,193 INFO L226 Difference]: Without dead ends: 1409 [2018-12-03 19:29:30,195 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 436 GetRequests, 322 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=6670, Invalid=6670, Unknown=0, NotChecked=0, Total=13340 [2018-12-03 19:29:30,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1409 states. [2018-12-03 19:29:30,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1409 to 1409. [2018-12-03 19:29:30,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1409 states. [2018-12-03 19:29:30,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1409 states to 1409 states and 1481 transitions. [2018-12-03 19:29:30,224 INFO L78 Accepts]: Start accepts. Automaton has 1409 states and 1481 transitions. Word has length 190 [2018-12-03 19:29:30,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:30,224 INFO L480 AbstractCegarLoop]: Abstraction has 1409 states and 1481 transitions. [2018-12-03 19:29:30,224 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 19:29:30,224 INFO L276 IsEmpty]: Start isEmpty. Operand 1409 states and 1481 transitions. [2018-12-03 19:29:30,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2018-12-03 19:29:30,226 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:30,226 INFO L402 BasicCegarLoop]: trace histogram [94, 92, 3, 1, 1, 1] [2018-12-03 19:29:30,226 INFO L423 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:30,226 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:30,226 INFO L82 PathProgramCache]: Analyzing trace with hash -1959390244, now seen corresponding path program 58 times [2018-12-03 19:29:30,227 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:30,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:30,227 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:29:30,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:30,227 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:30,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:31,518 INFO L134 CoverageAnalysis]: Checked inductivity of 9025 backedges. 4370 proven. 3249 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:31,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:31,518 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:31,518 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:31,518 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:31,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:31,518 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 19:29:31,527 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:29:31,528 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:29:31,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:31,600 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:31,638 INFO L134 CoverageAnalysis]: Checked inductivity of 9025 backedges. 4370 proven. 3249 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:31,638 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:35,921 INFO L134 CoverageAnalysis]: Checked inductivity of 9025 backedges. 4370 proven. 3249 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:35,940 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:35,940 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 117 [2018-12-03 19:29:35,940 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:35,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-12-03 19:29:35,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-12-03 19:29:35,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6903, Invalid=6903, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 19:29:35,942 INFO L87 Difference]: Start difference. First operand 1409 states and 1481 transitions. Second operand 60 states. [2018-12-03 19:29:36,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:36,108 INFO L93 Difference]: Finished difference Result 2704 states and 2848 transitions. [2018-12-03 19:29:36,108 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-12-03 19:29:36,108 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 192 [2018-12-03 19:29:36,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:36,112 INFO L225 Difference]: With dead ends: 2704 [2018-12-03 19:29:36,112 INFO L226 Difference]: Without dead ends: 1411 [2018-12-03 19:29:36,115 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 441 GetRequests, 325 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=6903, Invalid=6903, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 19:29:36,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1411 states. [2018-12-03 19:29:36,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1411 to 1411. [2018-12-03 19:29:36,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1411 states. [2018-12-03 19:29:36,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1411 states to 1411 states and 1483 transitions. [2018-12-03 19:29:36,149 INFO L78 Accepts]: Start accepts. Automaton has 1411 states and 1483 transitions. Word has length 192 [2018-12-03 19:29:36,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:36,150 INFO L480 AbstractCegarLoop]: Abstraction has 1411 states and 1483 transitions. [2018-12-03 19:29:36,150 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-12-03 19:29:36,150 INFO L276 IsEmpty]: Start isEmpty. Operand 1411 states and 1483 transitions. [2018-12-03 19:29:36,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-12-03 19:29:36,152 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:36,152 INFO L402 BasicCegarLoop]: trace histogram [95, 93, 3, 1, 1, 1] [2018-12-03 19:29:36,152 INFO L423 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:36,153 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:36,153 INFO L82 PathProgramCache]: Analyzing trace with hash -530027050, now seen corresponding path program 59 times [2018-12-03 19:29:36,153 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:36,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:36,154 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:29:36,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:36,154 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:36,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:37,490 INFO L134 CoverageAnalysis]: Checked inductivity of 9216 backedges. 4446 proven. 3364 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:37,490 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:37,490 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:37,490 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:37,490 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:37,490 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:37,490 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 19:29:37,498 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:29:37,499 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:29:37,558 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 44 check-sat command(s) [2018-12-03 19:29:37,558 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:29:37,560 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:38,380 INFO L134 CoverageAnalysis]: Checked inductivity of 9216 backedges. 3385 proven. 272 refuted. 0 times theorem prover too weak. 5559 trivial. 0 not checked. [2018-12-03 19:29:38,381 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:39,102 INFO L134 CoverageAnalysis]: Checked inductivity of 9216 backedges. 3385 proven. 272 refuted. 0 times theorem prover too weak. 5559 trivial. 0 not checked. [2018-12-03 19:29:39,120 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:39,120 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 20, 20] total 97 [2018-12-03 19:29:39,120 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:39,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-12-03 19:29:39,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-12-03 19:29:39,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2532, Invalid=6780, Unknown=0, NotChecked=0, Total=9312 [2018-12-03 19:29:39,122 INFO L87 Difference]: Start difference. First operand 1411 states and 1483 transitions. Second operand 79 states. [2018-12-03 19:29:42,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:42,091 INFO L93 Difference]: Finished difference Result 2799 states and 2966 transitions. [2018-12-03 19:29:42,091 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2018-12-03 19:29:42,091 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 194 [2018-12-03 19:29:42,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:42,094 INFO L225 Difference]: With dead ends: 2799 [2018-12-03 19:29:42,095 INFO L226 Difference]: Without dead ends: 1506 [2018-12-03 19:29:42,096 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 522 GetRequests, 351 SyntacticMatches, 0 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5678 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=9190, Invalid=20566, Unknown=0, NotChecked=0, Total=29756 [2018-12-03 19:29:42,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1506 states. [2018-12-03 19:29:42,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1506 to 1489. [2018-12-03 19:29:42,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1489 states. [2018-12-03 19:29:42,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1489 states to 1489 states and 1563 transitions. [2018-12-03 19:29:42,132 INFO L78 Accepts]: Start accepts. Automaton has 1489 states and 1563 transitions. Word has length 194 [2018-12-03 19:29:42,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:42,132 INFO L480 AbstractCegarLoop]: Abstraction has 1489 states and 1563 transitions. [2018-12-03 19:29:42,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has 79 states. [2018-12-03 19:29:42,132 INFO L276 IsEmpty]: Start isEmpty. Operand 1489 states and 1563 transitions. [2018-12-03 19:29:42,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2018-12-03 19:29:42,134 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:42,134 INFO L402 BasicCegarLoop]: trace histogram [96, 94, 3, 1, 1, 1] [2018-12-03 19:29:42,134 INFO L423 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:42,134 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:42,134 INFO L82 PathProgramCache]: Analyzing trace with hash -490984752, now seen corresponding path program 60 times [2018-12-03 19:29:42,135 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:42,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:42,135 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:29:42,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:42,135 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:42,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:43,776 INFO L134 CoverageAnalysis]: Checked inductivity of 9409 backedges. 4522 proven. 3481 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:43,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:43,776 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:43,776 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:43,776 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:43,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:43,776 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 19:29:43,785 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:29:43,785 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:29:43,861 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:29:43,861 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:29:43,864 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:43,898 INFO L134 CoverageAnalysis]: Checked inductivity of 9409 backedges. 4522 proven. 3481 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:43,898 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:47,890 INFO L134 CoverageAnalysis]: Checked inductivity of 9409 backedges. 4522 proven. 3481 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:47,909 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:47,909 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 121 [2018-12-03 19:29:47,909 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:47,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-12-03 19:29:47,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-12-03 19:29:47,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7381, Invalid=7381, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 19:29:47,911 INFO L87 Difference]: Start difference. First operand 1489 states and 1563 transitions. Second operand 62 states. [2018-12-03 19:29:48,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:48,040 INFO L93 Difference]: Finished difference Result 2860 states and 3008 transitions. [2018-12-03 19:29:48,041 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-12-03 19:29:48,041 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 196 [2018-12-03 19:29:48,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:48,043 INFO L225 Difference]: With dead ends: 2860 [2018-12-03 19:29:48,043 INFO L226 Difference]: Without dead ends: 1491 [2018-12-03 19:29:48,044 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 451 GetRequests, 331 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=7381, Invalid=7381, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 19:29:48,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1491 states. [2018-12-03 19:29:48,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1491 to 1491. [2018-12-03 19:29:48,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1491 states. [2018-12-03 19:29:48,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1491 states to 1491 states and 1565 transitions. [2018-12-03 19:29:48,073 INFO L78 Accepts]: Start accepts. Automaton has 1491 states and 1565 transitions. Word has length 196 [2018-12-03 19:29:48,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:48,073 INFO L480 AbstractCegarLoop]: Abstraction has 1491 states and 1565 transitions. [2018-12-03 19:29:48,073 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-12-03 19:29:48,073 INFO L276 IsEmpty]: Start isEmpty. Operand 1491 states and 1565 transitions. [2018-12-03 19:29:48,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2018-12-03 19:29:48,076 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:48,076 INFO L402 BasicCegarLoop]: trace histogram [97, 95, 3, 1, 1, 1] [2018-12-03 19:29:48,076 INFO L423 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:48,076 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:48,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1121777610, now seen corresponding path program 61 times [2018-12-03 19:29:48,076 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:48,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:48,077 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:29:48,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:48,077 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:48,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:49,712 INFO L134 CoverageAnalysis]: Checked inductivity of 9604 backedges. 4598 proven. 3600 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:49,712 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:49,712 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:49,712 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:49,712 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:49,712 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:49,712 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 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 19:29:49,721 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:29:49,721 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:29:49,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:49,798 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:49,827 INFO L134 CoverageAnalysis]: Checked inductivity of 9604 backedges. 4598 proven. 3600 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:49,827 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:54,008 INFO L134 CoverageAnalysis]: Checked inductivity of 9604 backedges. 4598 proven. 3600 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:54,026 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:54,026 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 123 [2018-12-03 19:29:54,027 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:54,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-12-03 19:29:54,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-12-03 19:29:54,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7626, Invalid=7626, Unknown=0, NotChecked=0, Total=15252 [2018-12-03 19:29:54,029 INFO L87 Difference]: Start difference. First operand 1491 states and 1565 transitions. Second operand 63 states. [2018-12-03 19:29:54,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:29:54,164 INFO L93 Difference]: Finished difference Result 2862 states and 3010 transitions. [2018-12-03 19:29:54,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 19:29:54,164 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 198 [2018-12-03 19:29:54,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:29:54,166 INFO L225 Difference]: With dead ends: 2862 [2018-12-03 19:29:54,166 INFO L226 Difference]: Without dead ends: 1493 [2018-12-03 19:29:54,168 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 334 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=7626, Invalid=7626, Unknown=0, NotChecked=0, Total=15252 [2018-12-03 19:29:54,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1493 states. [2018-12-03 19:29:54,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1493 to 1493. [2018-12-03 19:29:54,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1493 states. [2018-12-03 19:29:54,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1493 states to 1493 states and 1567 transitions. [2018-12-03 19:29:54,197 INFO L78 Accepts]: Start accepts. Automaton has 1493 states and 1567 transitions. Word has length 198 [2018-12-03 19:29:54,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:29:54,197 INFO L480 AbstractCegarLoop]: Abstraction has 1493 states and 1567 transitions. [2018-12-03 19:29:54,197 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-12-03 19:29:54,197 INFO L276 IsEmpty]: Start isEmpty. Operand 1493 states and 1567 transitions. [2018-12-03 19:29:54,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-12-03 19:29:54,199 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:29:54,199 INFO L402 BasicCegarLoop]: trace histogram [98, 96, 3, 1, 1, 1] [2018-12-03 19:29:54,199 INFO L423 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:29:54,199 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:29:54,200 INFO L82 PathProgramCache]: Analyzing trace with hash 503213636, now seen corresponding path program 62 times [2018-12-03 19:29:54,200 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:29:54,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:54,200 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:29:54,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:29:54,201 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:29:54,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:29:56,296 INFO L134 CoverageAnalysis]: Checked inductivity of 9801 backedges. 4674 proven. 3721 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:29:56,296 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:56,297 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:29:56,297 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:29:56,297 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:29:56,297 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:29:56,297 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 19:29:56,305 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:29:56,306 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:29:56,364 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-12-03 19:29:56,365 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:29:56,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:29:56,987 INFO L134 CoverageAnalysis]: Checked inductivity of 9801 backedges. 3332 proven. 306 refuted. 0 times theorem prover too weak. 6163 trivial. 0 not checked. [2018-12-03 19:29:56,988 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:29:57,786 INFO L134 CoverageAnalysis]: Checked inductivity of 9801 backedges. 3332 proven. 306 refuted. 0 times theorem prover too weak. 6163 trivial. 0 not checked. [2018-12-03 19:29:57,804 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:29:57,804 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 21, 21] total 102 [2018-12-03 19:29:57,804 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:29:57,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 19:29:57,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 19:29:57,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2795, Invalid=7507, Unknown=0, NotChecked=0, Total=10302 [2018-12-03 19:29:57,806 INFO L87 Difference]: Start difference. First operand 1493 states and 1567 transitions. Second operand 83 states. [2018-12-03 19:30:02,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:30:02,033 INFO L93 Difference]: Finished difference Result 2958 states and 3128 transitions. [2018-12-03 19:30:02,034 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2018-12-03 19:30:02,034 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 200 [2018-12-03 19:30:02,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:30:02,036 INFO L225 Difference]: With dead ends: 2958 [2018-12-03 19:30:02,036 INFO L226 Difference]: Without dead ends: 1589 [2018-12-03 19:30:02,039 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 361 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6298 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=10163, Invalid=22779, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 19:30:02,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1589 states. [2018-12-03 19:30:02,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1589 to 1571. [2018-12-03 19:30:02,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1571 states. [2018-12-03 19:30:02,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1571 states to 1571 states and 1647 transitions. [2018-12-03 19:30:02,094 INFO L78 Accepts]: Start accepts. Automaton has 1571 states and 1647 transitions. Word has length 200 [2018-12-03 19:30:02,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:30:02,094 INFO L480 AbstractCegarLoop]: Abstraction has 1571 states and 1647 transitions. [2018-12-03 19:30:02,094 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 19:30:02,094 INFO L276 IsEmpty]: Start isEmpty. Operand 1571 states and 1647 transitions. [2018-12-03 19:30:02,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2018-12-03 19:30:02,096 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:30:02,096 INFO L402 BasicCegarLoop]: trace histogram [99, 98, 2, 1, 1, 1] [2018-12-03 19:30:02,096 INFO L423 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:30:02,096 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:30:02,096 INFO L82 PathProgramCache]: Analyzing trace with hash -1573666948, now seen corresponding path program 63 times [2018-12-03 19:30:02,096 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:30:02,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:02,097 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:30:02,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:02,097 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:30:02,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:03,583 INFO L134 CoverageAnalysis]: Checked inductivity of 10000 backedges. 4750 proven. 3844 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:03,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:03,584 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:30:03,584 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:30:03,584 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:30:03,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:03,584 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:30:03,594 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:30:03,594 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:30:03,666 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:30:03,667 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:30:03,670 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:30:03,701 INFO L134 CoverageAnalysis]: Checked inductivity of 10000 backedges. 4750 proven. 3844 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:03,701 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:30:07,872 INFO L134 CoverageAnalysis]: Checked inductivity of 10000 backedges. 4750 proven. 3844 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:07,891 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:30:07,891 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 127 [2018-12-03 19:30:07,891 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:30:07,891 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 19:30:07,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 19:30:07,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8128, Invalid=8128, Unknown=0, NotChecked=0, Total=16256 [2018-12-03 19:30:07,893 INFO L87 Difference]: Start difference. First operand 1571 states and 1647 transitions. Second operand 65 states. [2018-12-03 19:30:08,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:30:08,050 INFO L93 Difference]: Finished difference Result 3018 states and 3170 transitions. [2018-12-03 19:30:08,051 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 19:30:08,051 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 202 [2018-12-03 19:30:08,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:30:08,053 INFO L225 Difference]: With dead ends: 3018 [2018-12-03 19:30:08,053 INFO L226 Difference]: Without dead ends: 1573 [2018-12-03 19:30:08,055 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 340 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=8128, Invalid=8128, Unknown=0, NotChecked=0, Total=16256 [2018-12-03 19:30:08,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1573 states. [2018-12-03 19:30:08,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1573 to 1573. [2018-12-03 19:30:08,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1573 states. [2018-12-03 19:30:08,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1573 states to 1573 states and 1649 transitions. [2018-12-03 19:30:08,085 INFO L78 Accepts]: Start accepts. Automaton has 1573 states and 1649 transitions. Word has length 202 [2018-12-03 19:30:08,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:30:08,085 INFO L480 AbstractCegarLoop]: Abstraction has 1573 states and 1649 transitions. [2018-12-03 19:30:08,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 19:30:08,086 INFO L276 IsEmpty]: Start isEmpty. Operand 1573 states and 1649 transitions. [2018-12-03 19:30:08,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-12-03 19:30:08,087 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:30:08,087 INFO L402 BasicCegarLoop]: trace histogram [100, 99, 2, 1, 1, 1] [2018-12-03 19:30:08,088 INFO L423 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:30:08,088 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:30:08,088 INFO L82 PathProgramCache]: Analyzing trace with hash -1973327626, now seen corresponding path program 64 times [2018-12-03 19:30:08,088 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:30:08,089 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:08,089 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:30:08,089 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:08,089 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:30:08,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:09,891 INFO L134 CoverageAnalysis]: Checked inductivity of 10201 backedges. 4826 proven. 3969 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:09,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:09,891 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:30:09,891 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:30:09,891 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:30:09,892 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:09,892 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:30:09,901 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:30:09,902 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:30:09,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:09,981 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:30:10,023 INFO L134 CoverageAnalysis]: Checked inductivity of 10201 backedges. 4826 proven. 3969 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:10,024 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:30:14,790 INFO L134 CoverageAnalysis]: Checked inductivity of 10201 backedges. 4826 proven. 3969 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:14,809 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:30:14,809 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 129 [2018-12-03 19:30:14,809 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:30:14,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-12-03 19:30:14,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-12-03 19:30:14,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8385, Invalid=8385, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 19:30:14,811 INFO L87 Difference]: Start difference. First operand 1573 states and 1649 transitions. Second operand 66 states. [2018-12-03 19:30:14,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:30:14,939 INFO L93 Difference]: Finished difference Result 3020 states and 3172 transitions. [2018-12-03 19:30:14,939 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-12-03 19:30:14,939 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 204 [2018-12-03 19:30:14,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:30:14,941 INFO L225 Difference]: With dead ends: 3020 [2018-12-03 19:30:14,942 INFO L226 Difference]: Without dead ends: 1575 [2018-12-03 19:30:14,944 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 343 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=8385, Invalid=8385, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 19:30:14,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1575 states. [2018-12-03 19:30:14,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1575 to 1575. [2018-12-03 19:30:14,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1575 states. [2018-12-03 19:30:14,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1575 states to 1575 states and 1651 transitions. [2018-12-03 19:30:14,987 INFO L78 Accepts]: Start accepts. Automaton has 1575 states and 1651 transitions. Word has length 204 [2018-12-03 19:30:14,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:30:14,987 INFO L480 AbstractCegarLoop]: Abstraction has 1575 states and 1651 transitions. [2018-12-03 19:30:14,987 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-12-03 19:30:14,987 INFO L276 IsEmpty]: Start isEmpty. Operand 1575 states and 1651 transitions. [2018-12-03 19:30:14,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-12-03 19:30:14,990 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:30:14,990 INFO L402 BasicCegarLoop]: trace histogram [101, 100, 2, 1, 1, 1] [2018-12-03 19:30:14,990 INFO L423 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:30:14,990 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:30:14,990 INFO L82 PathProgramCache]: Analyzing trace with hash 499817456, now seen corresponding path program 65 times [2018-12-03 19:30:14,990 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:30:14,991 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:14,991 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:30:14,991 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:14,991 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:30:15,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:16,715 INFO L134 CoverageAnalysis]: Checked inductivity of 10404 backedges. 4902 proven. 4096 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:16,715 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:16,715 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:30:16,716 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:30:16,716 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:30:16,716 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:16,716 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 19:30:16,728 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:30:16,728 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:30:16,850 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 19:30:16,850 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:30:16,853 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:30:17,518 INFO L134 CoverageAnalysis]: Checked inductivity of 10404 backedges. 5706 proven. 342 refuted. 0 times theorem prover too weak. 4356 trivial. 0 not checked. [2018-12-03 19:30:17,519 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:30:18,395 INFO L134 CoverageAnalysis]: Checked inductivity of 10404 backedges. 5706 proven. 342 refuted. 0 times theorem prover too weak. 4356 trivial. 0 not checked. [2018-12-03 19:30:18,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:30:18,416 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 22, 22] total 107 [2018-12-03 19:30:18,416 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:30:18,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-12-03 19:30:18,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-12-03 19:30:18,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3071, Invalid=8271, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 19:30:18,417 INFO L87 Difference]: Start difference. First operand 1575 states and 1651 transitions. Second operand 87 states. [2018-12-03 19:30:22,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:30:22,621 INFO L93 Difference]: Finished difference Result 3117 states and 3290 transitions. [2018-12-03 19:30:22,622 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2018-12-03 19:30:22,622 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 206 [2018-12-03 19:30:22,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:30:22,624 INFO L225 Difference]: With dead ends: 3117 [2018-12-03 19:30:22,624 INFO L226 Difference]: Without dead ends: 1672 [2018-12-03 19:30:22,626 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 560 GetRequests, 371 SyntacticMatches, 0 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6950 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=11185, Invalid=25105, Unknown=0, NotChecked=0, Total=36290 [2018-12-03 19:30:22,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1672 states. [2018-12-03 19:30:22,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1672 to 1653. [2018-12-03 19:30:22,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1653 states. [2018-12-03 19:30:22,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1653 states to 1653 states and 1731 transitions. [2018-12-03 19:30:22,671 INFO L78 Accepts]: Start accepts. Automaton has 1653 states and 1731 transitions. Word has length 206 [2018-12-03 19:30:22,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:30:22,671 INFO L480 AbstractCegarLoop]: Abstraction has 1653 states and 1731 transitions. [2018-12-03 19:30:22,672 INFO L481 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-12-03 19:30:22,672 INFO L276 IsEmpty]: Start isEmpty. Operand 1653 states and 1731 transitions. [2018-12-03 19:30:22,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2018-12-03 19:30:22,674 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:30:22,674 INFO L402 BasicCegarLoop]: trace histogram [102, 101, 2, 1, 1, 1] [2018-12-03 19:30:22,674 INFO L423 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:30:22,674 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:30:22,674 INFO L82 PathProgramCache]: Analyzing trace with hash 1440334058, now seen corresponding path program 66 times [2018-12-03 19:30:22,675 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:30:22,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:22,675 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:30:22,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:22,675 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:30:22,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:24,566 INFO L134 CoverageAnalysis]: Checked inductivity of 10609 backedges. 4978 proven. 4225 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:24,567 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:24,567 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:30:24,567 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:30:24,567 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:30:24,567 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:24,567 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 19:30:24,578 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:30:24,578 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:30:24,657 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:30:24,657 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:30:24,660 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:30:24,693 INFO L134 CoverageAnalysis]: Checked inductivity of 10609 backedges. 4978 proven. 4225 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:24,693 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:30:29,166 INFO L134 CoverageAnalysis]: Checked inductivity of 10609 backedges. 4978 proven. 4225 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:29,184 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:30:29,184 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 133 [2018-12-03 19:30:29,184 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:30:29,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-12-03 19:30:29,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-12-03 19:30:29,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8911, Invalid=8911, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 19:30:29,187 INFO L87 Difference]: Start difference. First operand 1653 states and 1731 transitions. Second operand 68 states. [2018-12-03 19:30:29,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:30:29,359 INFO L93 Difference]: Finished difference Result 3176 states and 3332 transitions. [2018-12-03 19:30:29,360 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-12-03 19:30:29,360 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 208 [2018-12-03 19:30:29,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:30:29,362 INFO L225 Difference]: With dead ends: 3176 [2018-12-03 19:30:29,362 INFO L226 Difference]: Without dead ends: 1655 [2018-12-03 19:30:29,365 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 349 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=8911, Invalid=8911, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 19:30:29,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1655 states. [2018-12-03 19:30:29,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1655 to 1655. [2018-12-03 19:30:29,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1655 states. [2018-12-03 19:30:29,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1655 states to 1655 states and 1733 transitions. [2018-12-03 19:30:29,442 INFO L78 Accepts]: Start accepts. Automaton has 1655 states and 1733 transitions. Word has length 208 [2018-12-03 19:30:29,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:30:29,443 INFO L480 AbstractCegarLoop]: Abstraction has 1655 states and 1733 transitions. [2018-12-03 19:30:29,443 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-12-03 19:30:29,443 INFO L276 IsEmpty]: Start isEmpty. Operand 1655 states and 1733 transitions. [2018-12-03 19:30:29,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2018-12-03 19:30:29,445 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:30:29,445 INFO L402 BasicCegarLoop]: trace histogram [103, 102, 2, 1, 1, 1] [2018-12-03 19:30:29,445 INFO L423 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:30:29,446 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:30:29,446 INFO L82 PathProgramCache]: Analyzing trace with hash -618862876, now seen corresponding path program 67 times [2018-12-03 19:30:29,446 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:30:29,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:29,447 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:30:29,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:29,447 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:30:29,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:31,117 INFO L134 CoverageAnalysis]: Checked inductivity of 10816 backedges. 5054 proven. 4356 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:31,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:31,117 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:30:31,117 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:30:31,117 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:30:31,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:31,117 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 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:30:31,125 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:30:31,125 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:30:31,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:31,203 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:30:31,235 INFO L134 CoverageAnalysis]: Checked inductivity of 10816 backedges. 5054 proven. 4356 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:31,235 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:30:36,295 INFO L134 CoverageAnalysis]: Checked inductivity of 10816 backedges. 5054 proven. 4356 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:36,314 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:30:36,314 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 135 [2018-12-03 19:30:36,314 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:30:36,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-12-03 19:30:36,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-12-03 19:30:36,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9180, Invalid=9180, Unknown=0, NotChecked=0, Total=18360 [2018-12-03 19:30:36,316 INFO L87 Difference]: Start difference. First operand 1655 states and 1733 transitions. Second operand 69 states. [2018-12-03 19:30:36,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:30:36,490 INFO L93 Difference]: Finished difference Result 3178 states and 3334 transitions. [2018-12-03 19:30:36,490 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-12-03 19:30:36,490 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 210 [2018-12-03 19:30:36,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:30:36,492 INFO L225 Difference]: With dead ends: 3178 [2018-12-03 19:30:36,492 INFO L226 Difference]: Without dead ends: 1657 [2018-12-03 19:30:36,493 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 352 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=9180, Invalid=9180, Unknown=0, NotChecked=0, Total=18360 [2018-12-03 19:30:36,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1657 states. [2018-12-03 19:30:36,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1657 to 1657. [2018-12-03 19:30:36,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1657 states. [2018-12-03 19:30:36,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1657 states to 1657 states and 1735 transitions. [2018-12-03 19:30:36,538 INFO L78 Accepts]: Start accepts. Automaton has 1657 states and 1735 transitions. Word has length 210 [2018-12-03 19:30:36,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:30:36,538 INFO L480 AbstractCegarLoop]: Abstraction has 1657 states and 1735 transitions. [2018-12-03 19:30:36,538 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-12-03 19:30:36,539 INFO L276 IsEmpty]: Start isEmpty. Operand 1657 states and 1735 transitions. [2018-12-03 19:30:36,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-12-03 19:30:36,541 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:30:36,541 INFO L402 BasicCegarLoop]: trace histogram [104, 103, 2, 1, 1, 1] [2018-12-03 19:30:36,541 INFO L423 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:30:36,541 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:30:36,541 INFO L82 PathProgramCache]: Analyzing trace with hash 472807006, now seen corresponding path program 68 times [2018-12-03 19:30:36,542 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:30:36,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:36,542 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:30:36,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:36,542 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:30:36,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:38,579 INFO L134 CoverageAnalysis]: Checked inductivity of 11025 backedges. 5130 proven. 4489 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:38,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:38,579 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:30:38,580 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:30:38,580 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:30:38,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:38,580 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 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:30:38,588 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:30:38,588 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:30:38,706 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 19:30:38,707 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:30:38,710 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:30:39,667 INFO L134 CoverageAnalysis]: Checked inductivity of 11025 backedges. 5934 proven. 380 refuted. 0 times theorem prover too weak. 4711 trivial. 0 not checked. [2018-12-03 19:30:39,668 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:30:40,649 INFO L134 CoverageAnalysis]: Checked inductivity of 11025 backedges. 5934 proven. 380 refuted. 0 times theorem prover too weak. 4711 trivial. 0 not checked. [2018-12-03 19:30:40,668 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:30:40,668 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 23, 23] total 112 [2018-12-03 19:30:40,668 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:30:40,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2018-12-03 19:30:40,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2018-12-03 19:30:40,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3360, Invalid=9072, Unknown=0, NotChecked=0, Total=12432 [2018-12-03 19:30:40,670 INFO L87 Difference]: Start difference. First operand 1657 states and 1735 transitions. Second operand 91 states. [2018-12-03 19:30:45,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:30:45,092 INFO L93 Difference]: Finished difference Result 3276 states and 3452 transitions. [2018-12-03 19:30:45,092 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-12-03 19:30:45,092 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 212 [2018-12-03 19:30:45,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:30:45,094 INFO L225 Difference]: With dead ends: 3276 [2018-12-03 19:30:45,094 INFO L226 Difference]: Without dead ends: 1755 [2018-12-03 19:30:45,095 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 579 GetRequests, 381 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7634 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=12256, Invalid=27544, Unknown=0, NotChecked=0, Total=39800 [2018-12-03 19:30:45,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1755 states. [2018-12-03 19:30:45,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1755 to 1735. [2018-12-03 19:30:45,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1735 states. [2018-12-03 19:30:45,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1735 states to 1735 states and 1815 transitions. [2018-12-03 19:30:45,127 INFO L78 Accepts]: Start accepts. Automaton has 1735 states and 1815 transitions. Word has length 212 [2018-12-03 19:30:45,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:30:45,128 INFO L480 AbstractCegarLoop]: Abstraction has 1735 states and 1815 transitions. [2018-12-03 19:30:45,128 INFO L481 AbstractCegarLoop]: Interpolant automaton has 91 states. [2018-12-03 19:30:45,128 INFO L276 IsEmpty]: Start isEmpty. Operand 1735 states and 1815 transitions. [2018-12-03 19:30:45,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2018-12-03 19:30:45,129 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:30:45,130 INFO L402 BasicCegarLoop]: trace histogram [105, 104, 2, 1, 1, 1] [2018-12-03 19:30:45,130 INFO L423 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:30:45,130 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:30:45,130 INFO L82 PathProgramCache]: Analyzing trace with hash -849807400, now seen corresponding path program 69 times [2018-12-03 19:30:45,130 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:30:45,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:45,131 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:30:45,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:45,131 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:30:45,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:46,862 INFO L134 CoverageAnalysis]: Checked inductivity of 11236 backedges. 5206 proven. 4624 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:46,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:46,863 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:30:46,863 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:30:46,863 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:30:46,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:46,863 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 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:30:46,871 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:30:46,872 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:30:46,952 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:30:46,952 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:30:46,956 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:30:46,990 INFO L134 CoverageAnalysis]: Checked inductivity of 11236 backedges. 5206 proven. 4624 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:46,990 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:30:52,175 INFO L134 CoverageAnalysis]: Checked inductivity of 11236 backedges. 5206 proven. 4624 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:52,195 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:30:52,195 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 139 [2018-12-03 19:30:52,195 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:30:52,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 19:30:52,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 19:30:52,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9730, Invalid=9730, Unknown=0, NotChecked=0, Total=19460 [2018-12-03 19:30:52,197 INFO L87 Difference]: Start difference. First operand 1735 states and 1815 transitions. Second operand 71 states. [2018-12-03 19:30:52,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:30:52,389 INFO L93 Difference]: Finished difference Result 3334 states and 3494 transitions. [2018-12-03 19:30:52,389 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 19:30:52,389 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 214 [2018-12-03 19:30:52,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:30:52,390 INFO L225 Difference]: With dead ends: 3334 [2018-12-03 19:30:52,390 INFO L226 Difference]: Without dead ends: 1737 [2018-12-03 19:30:52,392 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 358 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=9730, Invalid=9730, Unknown=0, NotChecked=0, Total=19460 [2018-12-03 19:30:52,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1737 states. [2018-12-03 19:30:52,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1737 to 1737. [2018-12-03 19:30:52,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1737 states. [2018-12-03 19:30:52,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1737 states to 1737 states and 1817 transitions. [2018-12-03 19:30:52,443 INFO L78 Accepts]: Start accepts. Automaton has 1737 states and 1817 transitions. Word has length 214 [2018-12-03 19:30:52,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:30:52,443 INFO L480 AbstractCegarLoop]: Abstraction has 1737 states and 1817 transitions. [2018-12-03 19:30:52,443 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 19:30:52,443 INFO L276 IsEmpty]: Start isEmpty. Operand 1737 states and 1817 transitions. [2018-12-03 19:30:52,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2018-12-03 19:30:52,446 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:30:52,446 INFO L402 BasicCegarLoop]: trace histogram [106, 105, 2, 1, 1, 1] [2018-12-03 19:30:52,446 INFO L423 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:30:52,446 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:30:52,447 INFO L82 PathProgramCache]: Analyzing trace with hash 63060562, now seen corresponding path program 70 times [2018-12-03 19:30:52,447 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:30:52,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:52,447 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:30:52,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:30:52,448 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:30:52,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:54,386 INFO L134 CoverageAnalysis]: Checked inductivity of 11449 backedges. 5282 proven. 4761 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:54,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:54,386 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:30:54,386 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:30:54,386 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:30:54,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:30:54,386 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:30:54,394 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:30:54,394 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:30:54,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:30:54,476 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:30:54,509 INFO L134 CoverageAnalysis]: Checked inductivity of 11449 backedges. 5282 proven. 4761 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:30:54,509 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:31:00,018 INFO L134 CoverageAnalysis]: Checked inductivity of 11449 backedges. 5282 proven. 4761 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:31:00,036 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:31:00,036 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 141 [2018-12-03 19:31:00,037 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:31:00,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-12-03 19:31:00,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-12-03 19:31:00,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10011, Invalid=10011, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 19:31:00,038 INFO L87 Difference]: Start difference. First operand 1737 states and 1817 transitions. Second operand 72 states. [2018-12-03 19:31:00,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:00,227 INFO L93 Difference]: Finished difference Result 3336 states and 3496 transitions. [2018-12-03 19:31:00,227 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-03 19:31:00,227 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 216 [2018-12-03 19:31:00,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:00,228 INFO L225 Difference]: With dead ends: 3336 [2018-12-03 19:31:00,228 INFO L226 Difference]: Without dead ends: 1739 [2018-12-03 19:31:00,230 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 361 SyntacticMatches, 0 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=10011, Invalid=10011, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 19:31:00,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1739 states. [2018-12-03 19:31:00,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1739 to 1739. [2018-12-03 19:31:00,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1739 states. [2018-12-03 19:31:00,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1739 states to 1739 states and 1819 transitions. [2018-12-03 19:31:00,264 INFO L78 Accepts]: Start accepts. Automaton has 1739 states and 1819 transitions. Word has length 216 [2018-12-03 19:31:00,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:00,264 INFO L480 AbstractCegarLoop]: Abstraction has 1739 states and 1819 transitions. [2018-12-03 19:31:00,264 INFO L481 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-12-03 19:31:00,264 INFO L276 IsEmpty]: Start isEmpty. Operand 1739 states and 1819 transitions. [2018-12-03 19:31:00,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-12-03 19:31:00,266 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:00,266 INFO L402 BasicCegarLoop]: trace histogram [107, 106, 2, 1, 1, 1] [2018-12-03 19:31:00,266 INFO L423 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:00,266 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:00,266 INFO L82 PathProgramCache]: Analyzing trace with hash 1155843660, now seen corresponding path program 71 times [2018-12-03 19:31:00,266 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:00,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:00,267 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:31:00,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:00,267 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:00,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:02,078 INFO L134 CoverageAnalysis]: Checked inductivity of 11664 backedges. 5358 proven. 4900 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:31:02,078 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:02,078 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:02,079 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:02,079 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:02,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:02,079 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 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:31:02,088 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:31:02,088 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:31:02,247 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 19:31:02,247 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:31:02,250 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:31:03,002 INFO L134 CoverageAnalysis]: Checked inductivity of 11664 backedges. 6158 proven. 420 refuted. 0 times theorem prover too weak. 5086 trivial. 0 not checked. [2018-12-03 19:31:03,002 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:31:04,110 INFO L134 CoverageAnalysis]: Checked inductivity of 11664 backedges. 6158 proven. 420 refuted. 0 times theorem prover too weak. 5086 trivial. 0 not checked. [2018-12-03 19:31:04,128 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:31:04,129 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 24, 24] total 117 [2018-12-03 19:31:04,129 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:31:04,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 19:31:04,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 19:31:04,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3662, Invalid=9910, Unknown=0, NotChecked=0, Total=13572 [2018-12-03 19:31:04,131 INFO L87 Difference]: Start difference. First operand 1739 states and 1819 transitions. Second operand 95 states. [2018-12-03 19:31:09,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:09,298 INFO L93 Difference]: Finished difference Result 3435 states and 3614 transitions. [2018-12-03 19:31:09,298 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2018-12-03 19:31:09,298 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 218 [2018-12-03 19:31:09,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:09,300 INFO L225 Difference]: With dead ends: 3435 [2018-12-03 19:31:09,300 INFO L226 Difference]: Without dead ends: 1838 [2018-12-03 19:31:09,304 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 598 GetRequests, 391 SyntacticMatches, 0 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8350 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=13376, Invalid=30096, Unknown=0, NotChecked=0, Total=43472 [2018-12-03 19:31:09,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1838 states. [2018-12-03 19:31:09,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1838 to 1817. [2018-12-03 19:31:09,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1817 states. [2018-12-03 19:31:09,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1817 states to 1817 states and 1899 transitions. [2018-12-03 19:31:09,338 INFO L78 Accepts]: Start accepts. Automaton has 1817 states and 1899 transitions. Word has length 218 [2018-12-03 19:31:09,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:09,339 INFO L480 AbstractCegarLoop]: Abstraction has 1817 states and 1899 transitions. [2018-12-03 19:31:09,339 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 19:31:09,339 INFO L276 IsEmpty]: Start isEmpty. Operand 1817 states and 1899 transitions. [2018-12-03 19:31:09,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2018-12-03 19:31:09,340 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:09,341 INFO L402 BasicCegarLoop]: trace histogram [108, 107, 2, 1, 1, 1] [2018-12-03 19:31:09,341 INFO L423 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:09,341 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:09,341 INFO L82 PathProgramCache]: Analyzing trace with hash 829637702, now seen corresponding path program 72 times [2018-12-03 19:31:09,341 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:09,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:09,342 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:31:09,342 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:09,342 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:09,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:11,607 INFO L134 CoverageAnalysis]: Checked inductivity of 11881 backedges. 5434 proven. 5041 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:31:11,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:11,608 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:11,608 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:11,608 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:11,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:11,608 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 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:31:11,617 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:31:11,617 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:31:11,699 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:31:11,699 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:31:11,703 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:31:11,738 INFO L134 CoverageAnalysis]: Checked inductivity of 11881 backedges. 5434 proven. 5041 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:31:11,738 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:31:17,288 INFO L134 CoverageAnalysis]: Checked inductivity of 11881 backedges. 5434 proven. 5041 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:31:17,306 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:31:17,307 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 145 [2018-12-03 19:31:17,307 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:31:17,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-03 19:31:17,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-03 19:31:17,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10585, Invalid=10585, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 19:31:17,308 INFO L87 Difference]: Start difference. First operand 1817 states and 1899 transitions. Second operand 74 states. [2018-12-03 19:31:17,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:17,540 INFO L93 Difference]: Finished difference Result 3492 states and 3656 transitions. [2018-12-03 19:31:17,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2018-12-03 19:31:17,541 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 220 [2018-12-03 19:31:17,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:17,542 INFO L225 Difference]: With dead ends: 3492 [2018-12-03 19:31:17,542 INFO L226 Difference]: Without dead ends: 1819 [2018-12-03 19:31:17,544 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 511 GetRequests, 367 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=10585, Invalid=10585, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 19:31:17,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1819 states. [2018-12-03 19:31:17,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1819 to 1819. [2018-12-03 19:31:17,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1819 states. [2018-12-03 19:31:17,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1819 states to 1819 states and 1901 transitions. [2018-12-03 19:31:17,577 INFO L78 Accepts]: Start accepts. Automaton has 1819 states and 1901 transitions. Word has length 220 [2018-12-03 19:31:17,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:17,577 INFO L480 AbstractCegarLoop]: Abstraction has 1819 states and 1901 transitions. [2018-12-03 19:31:17,577 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-03 19:31:17,577 INFO L276 IsEmpty]: Start isEmpty. Operand 1819 states and 1901 transitions. [2018-12-03 19:31:17,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-12-03 19:31:17,579 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:17,579 INFO L402 BasicCegarLoop]: trace histogram [109, 108, 2, 1, 1, 1] [2018-12-03 19:31:17,579 INFO L423 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:17,579 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:17,580 INFO L82 PathProgramCache]: Analyzing trace with hash -971291840, now seen corresponding path program 73 times [2018-12-03 19:31:17,580 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:17,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:17,580 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:31:17,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:17,580 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:17,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:19,509 INFO L134 CoverageAnalysis]: Checked inductivity of 12100 backedges. 5510 proven. 5184 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:31:19,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:19,509 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:19,509 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:19,510 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:19,510 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:19,510 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 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:31:19,517 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:31:19,517 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:31:19,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:19,602 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:31:19,639 INFO L134 CoverageAnalysis]: Checked inductivity of 12100 backedges. 5510 proven. 5184 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:31:19,639 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:31:25,335 INFO L134 CoverageAnalysis]: Checked inductivity of 12100 backedges. 5510 proven. 5184 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:31:25,353 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:31:25,354 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 147 [2018-12-03 19:31:25,354 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:31:25,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-12-03 19:31:25,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-12-03 19:31:25,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10878, Invalid=10878, Unknown=0, NotChecked=0, Total=21756 [2018-12-03 19:31:25,356 INFO L87 Difference]: Start difference. First operand 1819 states and 1901 transitions. Second operand 75 states. [2018-12-03 19:31:25,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:25,603 INFO L93 Difference]: Finished difference Result 3494 states and 3658 transitions. [2018-12-03 19:31:25,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 19:31:25,604 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 222 [2018-12-03 19:31:25,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:25,605 INFO L225 Difference]: With dead ends: 3494 [2018-12-03 19:31:25,605 INFO L226 Difference]: Without dead ends: 1821 [2018-12-03 19:31:25,608 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 370 SyntacticMatches, 0 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=10878, Invalid=10878, Unknown=0, NotChecked=0, Total=21756 [2018-12-03 19:31:25,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1821 states. [2018-12-03 19:31:25,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1821 to 1821. [2018-12-03 19:31:25,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1821 states. [2018-12-03 19:31:25,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1821 states to 1821 states and 1903 transitions. [2018-12-03 19:31:25,649 INFO L78 Accepts]: Start accepts. Automaton has 1821 states and 1903 transitions. Word has length 222 [2018-12-03 19:31:25,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:25,649 INFO L480 AbstractCegarLoop]: Abstraction has 1821 states and 1903 transitions. [2018-12-03 19:31:25,649 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-12-03 19:31:25,649 INFO L276 IsEmpty]: Start isEmpty. Operand 1821 states and 1903 transitions. [2018-12-03 19:31:25,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2018-12-03 19:31:25,651 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:25,651 INFO L402 BasicCegarLoop]: trace histogram [110, 109, 2, 1, 1, 1] [2018-12-03 19:31:25,651 INFO L423 AbstractCegarLoop]: === Iteration 77 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:25,651 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:25,652 INFO L82 PathProgramCache]: Analyzing trace with hash -792761414, now seen corresponding path program 74 times [2018-12-03 19:31:25,652 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:25,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:25,652 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:31:25,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:25,652 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:25,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:27,677 INFO L134 CoverageAnalysis]: Checked inductivity of 12321 backedges. 5586 proven. 5329 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:31:27,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:27,678 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:27,678 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:27,678 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:27,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:27,678 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 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:31:27,687 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:31:27,687 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:31:27,806 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 19:31:27,806 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:31:27,809 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:31:28,640 INFO L134 CoverageAnalysis]: Checked inductivity of 12321 backedges. 6378 proven. 462 refuted. 0 times theorem prover too weak. 5481 trivial. 0 not checked. [2018-12-03 19:31:28,640 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:31:29,817 INFO L134 CoverageAnalysis]: Checked inductivity of 12321 backedges. 6378 proven. 462 refuted. 0 times theorem prover too weak. 5481 trivial. 0 not checked. [2018-12-03 19:31:29,837 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:31:29,837 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 25, 25] total 122 [2018-12-03 19:31:29,837 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:31:29,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-12-03 19:31:29,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-12-03 19:31:29,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3977, Invalid=10785, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 19:31:29,839 INFO L87 Difference]: Start difference. First operand 1821 states and 1903 transitions. Second operand 99 states. [2018-12-03 19:31:35,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:35,353 INFO L93 Difference]: Finished difference Result 3594 states and 3776 transitions. [2018-12-03 19:31:35,353 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-12-03 19:31:35,353 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 224 [2018-12-03 19:31:35,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:35,354 INFO L225 Difference]: With dead ends: 3594 [2018-12-03 19:31:35,354 INFO L226 Difference]: Without dead ends: 1921 [2018-12-03 19:31:35,358 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 617 GetRequests, 401 SyntacticMatches, 0 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9098 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=14545, Invalid=32761, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 19:31:35,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1921 states. [2018-12-03 19:31:35,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1921 to 1899. [2018-12-03 19:31:35,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1899 states. [2018-12-03 19:31:35,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1899 states to 1899 states and 1983 transitions. [2018-12-03 19:31:35,393 INFO L78 Accepts]: Start accepts. Automaton has 1899 states and 1983 transitions. Word has length 224 [2018-12-03 19:31:35,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:35,393 INFO L480 AbstractCegarLoop]: Abstraction has 1899 states and 1983 transitions. [2018-12-03 19:31:35,393 INFO L481 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-12-03 19:31:35,393 INFO L276 IsEmpty]: Start isEmpty. Operand 1899 states and 1983 transitions. [2018-12-03 19:31:35,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2018-12-03 19:31:35,395 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:35,395 INFO L402 BasicCegarLoop]: trace histogram [111, 110, 2, 1, 1, 1] [2018-12-03 19:31:35,395 INFO L423 AbstractCegarLoop]: === Iteration 78 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:35,395 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:35,395 INFO L82 PathProgramCache]: Analyzing trace with hash -771586508, now seen corresponding path program 75 times [2018-12-03 19:31:35,396 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:35,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:35,396 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:31:35,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:35,396 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:35,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:37,792 INFO L134 CoverageAnalysis]: Checked inductivity of 12544 backedges. 5662 proven. 5476 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:31:37,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:37,793 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:37,793 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:37,793 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:37,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:37,793 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 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:31:37,802 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:31:37,802 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:31:37,887 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:31:37,887 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:31:37,891 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:31:37,967 INFO L134 CoverageAnalysis]: Checked inductivity of 12544 backedges. 5662 proven. 5476 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:31:37,967 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:31:43,896 INFO L134 CoverageAnalysis]: Checked inductivity of 12544 backedges. 5662 proven. 5476 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:31:43,914 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:31:43,914 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 151 [2018-12-03 19:31:43,915 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:31:43,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 19:31:43,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 19:31:43,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11476, Invalid=11476, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 19:31:43,916 INFO L87 Difference]: Start difference. First operand 1899 states and 1983 transitions. Second operand 77 states. [2018-12-03 19:31:44,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:44,165 INFO L93 Difference]: Finished difference Result 3650 states and 3818 transitions. [2018-12-03 19:31:44,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 19:31:44,165 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 226 [2018-12-03 19:31:44,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:44,167 INFO L225 Difference]: With dead ends: 3650 [2018-12-03 19:31:44,167 INFO L226 Difference]: Without dead ends: 1901 [2018-12-03 19:31:44,169 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 376 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=11476, Invalid=11476, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 19:31:44,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1901 states. [2018-12-03 19:31:44,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1901 to 1901. [2018-12-03 19:31:44,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1901 states. [2018-12-03 19:31:44,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1901 states to 1901 states and 1985 transitions. [2018-12-03 19:31:44,204 INFO L78 Accepts]: Start accepts. Automaton has 1901 states and 1985 transitions. Word has length 226 [2018-12-03 19:31:44,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:44,204 INFO L480 AbstractCegarLoop]: Abstraction has 1901 states and 1985 transitions. [2018-12-03 19:31:44,204 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 19:31:44,204 INFO L276 IsEmpty]: Start isEmpty. Operand 1901 states and 1985 transitions. [2018-12-03 19:31:44,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2018-12-03 19:31:44,206 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:44,206 INFO L402 BasicCegarLoop]: trace histogram [112, 111, 2, 1, 1, 1] [2018-12-03 19:31:44,206 INFO L423 AbstractCegarLoop]: === Iteration 79 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:44,206 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:44,206 INFO L82 PathProgramCache]: Analyzing trace with hash 621404590, now seen corresponding path program 76 times [2018-12-03 19:31:44,207 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:44,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:44,207 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:31:44,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:44,207 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:44,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:46,591 INFO L134 CoverageAnalysis]: Checked inductivity of 12769 backedges. 5738 proven. 5625 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:31:46,591 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:46,591 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:46,591 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:46,592 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:46,592 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:46,592 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 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:31:46,600 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:31:46,601 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:31:46,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:46,689 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:31:46,727 INFO L134 CoverageAnalysis]: Checked inductivity of 12769 backedges. 5738 proven. 5625 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:31:46,727 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:31:52,839 INFO L134 CoverageAnalysis]: Checked inductivity of 12769 backedges. 5738 proven. 5625 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:31:52,859 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:31:52,859 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 153 [2018-12-03 19:31:52,859 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:31:52,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 78 states [2018-12-03 19:31:52,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2018-12-03 19:31:52,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11781, Invalid=11781, Unknown=0, NotChecked=0, Total=23562 [2018-12-03 19:31:52,861 INFO L87 Difference]: Start difference. First operand 1901 states and 1985 transitions. Second operand 78 states. [2018-12-03 19:31:53,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:31:53,051 INFO L93 Difference]: Finished difference Result 3652 states and 3820 transitions. [2018-12-03 19:31:53,051 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2018-12-03 19:31:53,051 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 228 [2018-12-03 19:31:53,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:31:53,052 INFO L225 Difference]: With dead ends: 3652 [2018-12-03 19:31:53,052 INFO L226 Difference]: Without dead ends: 1903 [2018-12-03 19:31:53,054 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 531 GetRequests, 379 SyntacticMatches, 0 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=11781, Invalid=11781, Unknown=0, NotChecked=0, Total=23562 [2018-12-03 19:31:53,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1903 states. [2018-12-03 19:31:53,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1903 to 1903. [2018-12-03 19:31:53,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1903 states. [2018-12-03 19:31:53,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1903 states to 1903 states and 1987 transitions. [2018-12-03 19:31:53,091 INFO L78 Accepts]: Start accepts. Automaton has 1903 states and 1987 transitions. Word has length 228 [2018-12-03 19:31:53,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:31:53,091 INFO L480 AbstractCegarLoop]: Abstraction has 1903 states and 1987 transitions. [2018-12-03 19:31:53,091 INFO L481 AbstractCegarLoop]: Interpolant automaton has 78 states. [2018-12-03 19:31:53,091 INFO L276 IsEmpty]: Start isEmpty. Operand 1903 states and 1987 transitions. [2018-12-03 19:31:53,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2018-12-03 19:31:53,093 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:31:53,093 INFO L402 BasicCegarLoop]: trace histogram [113, 112, 2, 1, 1, 1] [2018-12-03 19:31:53,093 INFO L423 AbstractCegarLoop]: === Iteration 80 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:31:53,093 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:31:53,093 INFO L82 PathProgramCache]: Analyzing trace with hash -743946584, now seen corresponding path program 77 times [2018-12-03 19:31:53,093 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:31:53,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:53,094 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:31:53,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:31:53,094 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:31:53,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:31:55,312 INFO L134 CoverageAnalysis]: Checked inductivity of 12996 backedges. 5814 proven. 5776 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:31:55,312 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:55,312 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:31:55,313 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:31:55,313 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:31:55,313 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:31:55,313 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 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:31:55,323 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:31:55,323 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:31:55,442 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 19:31:55,442 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:31:55,445 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:31:56,574 INFO L134 CoverageAnalysis]: Checked inductivity of 12996 backedges. 6594 proven. 506 refuted. 0 times theorem prover too weak. 5896 trivial. 0 not checked. [2018-12-03 19:31:56,575 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:31:57,893 INFO L134 CoverageAnalysis]: Checked inductivity of 12996 backedges. 6594 proven. 506 refuted. 0 times theorem prover too weak. 5896 trivial. 0 not checked. [2018-12-03 19:31:57,911 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:31:57,912 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 26, 26] total 127 [2018-12-03 19:31:57,912 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:31:57,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 103 states [2018-12-03 19:31:57,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2018-12-03 19:31:57,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4305, Invalid=11697, Unknown=0, NotChecked=0, Total=16002 [2018-12-03 19:31:57,913 INFO L87 Difference]: Start difference. First operand 1903 states and 1987 transitions. Second operand 103 states. [2018-12-03 19:32:03,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:32:03,237 INFO L93 Difference]: Finished difference Result 3753 states and 3938 transitions. [2018-12-03 19:32:03,237 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2018-12-03 19:32:03,237 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 230 [2018-12-03 19:32:03,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:32:03,238 INFO L225 Difference]: With dead ends: 3753 [2018-12-03 19:32:03,238 INFO L226 Difference]: Without dead ends: 2004 [2018-12-03 19:32:03,240 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 636 GetRequests, 411 SyntacticMatches, 0 SemanticMatches, 225 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9878 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=15763, Invalid=35539, Unknown=0, NotChecked=0, Total=51302 [2018-12-03 19:32:03,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2004 states. [2018-12-03 19:32:03,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2004 to 1981. [2018-12-03 19:32:03,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1981 states. [2018-12-03 19:32:03,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1981 states to 1981 states and 2067 transitions. [2018-12-03 19:32:03,278 INFO L78 Accepts]: Start accepts. Automaton has 1981 states and 2067 transitions. Word has length 230 [2018-12-03 19:32:03,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:32:03,278 INFO L480 AbstractCegarLoop]: Abstraction has 1981 states and 2067 transitions. [2018-12-03 19:32:03,278 INFO L481 AbstractCegarLoop]: Interpolant automaton has 103 states. [2018-12-03 19:32:03,278 INFO L276 IsEmpty]: Start isEmpty. Operand 1981 states and 2067 transitions. [2018-12-03 19:32:03,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 233 [2018-12-03 19:32:03,280 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:32:03,280 INFO L402 BasicCegarLoop]: trace histogram [114, 113, 2, 1, 1, 1] [2018-12-03 19:32:03,280 INFO L423 AbstractCegarLoop]: === Iteration 81 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:32:03,280 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:32:03,280 INFO L82 PathProgramCache]: Analyzing trace with hash 1945673122, now seen corresponding path program 78 times [2018-12-03 19:32:03,281 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:32:03,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:03,281 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:32:03,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:03,281 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:32:03,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:32:05,450 INFO L134 CoverageAnalysis]: Checked inductivity of 13225 backedges. 5890 proven. 5929 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:32:05,450 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:05,450 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:32:05,451 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:32:05,451 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:32:05,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:05,451 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 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:32:05,459 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:32:05,459 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:32:05,546 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:32:05,546 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:32:05,550 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:32:05,588 INFO L134 CoverageAnalysis]: Checked inductivity of 13225 backedges. 5890 proven. 5929 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:32:05,588 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:32:12,552 INFO L134 CoverageAnalysis]: Checked inductivity of 13225 backedges. 5890 proven. 5929 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:32:12,571 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:32:12,571 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 157 [2018-12-03 19:32:12,571 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:32:12,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-12-03 19:32:12,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-12-03 19:32:12,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12403, Invalid=12403, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 19:32:12,573 INFO L87 Difference]: Start difference. First operand 1981 states and 2067 transitions. Second operand 80 states. [2018-12-03 19:32:12,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:32:12,843 INFO L93 Difference]: Finished difference Result 3808 states and 3980 transitions. [2018-12-03 19:32:12,843 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-12-03 19:32:12,844 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 232 [2018-12-03 19:32:12,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:32:12,845 INFO L225 Difference]: With dead ends: 3808 [2018-12-03 19:32:12,845 INFO L226 Difference]: Without dead ends: 1983 [2018-12-03 19:32:12,846 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 385 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=12403, Invalid=12403, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 19:32:12,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1983 states. [2018-12-03 19:32:12,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1983 to 1983. [2018-12-03 19:32:12,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1983 states. [2018-12-03 19:32:12,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1983 states to 1983 states and 2069 transitions. [2018-12-03 19:32:12,883 INFO L78 Accepts]: Start accepts. Automaton has 1983 states and 2069 transitions. Word has length 232 [2018-12-03 19:32:12,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:32:12,883 INFO L480 AbstractCegarLoop]: Abstraction has 1983 states and 2069 transitions. [2018-12-03 19:32:12,883 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-12-03 19:32:12,883 INFO L276 IsEmpty]: Start isEmpty. Operand 1983 states and 2069 transitions. [2018-12-03 19:32:12,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2018-12-03 19:32:12,885 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:32:12,885 INFO L402 BasicCegarLoop]: trace histogram [115, 114, 2, 1, 1, 1] [2018-12-03 19:32:12,886 INFO L423 AbstractCegarLoop]: === Iteration 82 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:32:12,886 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:32:12,886 INFO L82 PathProgramCache]: Analyzing trace with hash 847771036, now seen corresponding path program 79 times [2018-12-03 19:32:12,886 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:32:12,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:12,886 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:32:12,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:12,887 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:32:12,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:32:15,106 INFO L134 CoverageAnalysis]: Checked inductivity of 13456 backedges. 5966 proven. 6084 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:32:15,106 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:15,106 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:32:15,106 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:32:15,106 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:32:15,106 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:15,106 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 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:32:15,115 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:32:15,115 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:32:15,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:32:15,204 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:32:15,244 INFO L134 CoverageAnalysis]: Checked inductivity of 13456 backedges. 5966 proven. 6084 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:32:15,244 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:32:22,269 INFO L134 CoverageAnalysis]: Checked inductivity of 13456 backedges. 5966 proven. 6084 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:32:22,288 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:32:22,288 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 159 [2018-12-03 19:32:22,288 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:32:22,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-12-03 19:32:22,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-12-03 19:32:22,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12720, Invalid=12720, Unknown=0, NotChecked=0, Total=25440 [2018-12-03 19:32:22,290 INFO L87 Difference]: Start difference. First operand 1983 states and 2069 transitions. Second operand 81 states. [2018-12-03 19:32:22,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:32:22,540 INFO L93 Difference]: Finished difference Result 3810 states and 3982 transitions. [2018-12-03 19:32:22,540 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 19:32:22,540 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 234 [2018-12-03 19:32:22,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:32:22,541 INFO L225 Difference]: With dead ends: 3810 [2018-12-03 19:32:22,542 INFO L226 Difference]: Without dead ends: 1985 [2018-12-03 19:32:22,543 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 388 SyntacticMatches, 0 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=12720, Invalid=12720, Unknown=0, NotChecked=0, Total=25440 [2018-12-03 19:32:22,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1985 states. [2018-12-03 19:32:22,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1985 to 1985. [2018-12-03 19:32:22,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1985 states. [2018-12-03 19:32:22,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1985 states to 1985 states and 2071 transitions. [2018-12-03 19:32:22,579 INFO L78 Accepts]: Start accepts. Automaton has 1985 states and 2071 transitions. Word has length 234 [2018-12-03 19:32:22,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:32:22,579 INFO L480 AbstractCegarLoop]: Abstraction has 1985 states and 2071 transitions. [2018-12-03 19:32:22,579 INFO L481 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-12-03 19:32:22,579 INFO L276 IsEmpty]: Start isEmpty. Operand 1985 states and 2071 transitions. [2018-12-03 19:32:22,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2018-12-03 19:32:22,581 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:32:22,581 INFO L402 BasicCegarLoop]: trace histogram [116, 115, 2, 1, 1, 1] [2018-12-03 19:32:22,581 INFO L423 AbstractCegarLoop]: === Iteration 83 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:32:22,581 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:32:22,582 INFO L82 PathProgramCache]: Analyzing trace with hash -1969146090, now seen corresponding path program 80 times [2018-12-03 19:32:22,582 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:32:22,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:22,582 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:32:22,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:22,582 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:32:22,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:32:24,868 INFO L134 CoverageAnalysis]: Checked inductivity of 13689 backedges. 6042 proven. 6241 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:32:24,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:24,868 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:32:24,868 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:32:24,869 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:32:24,869 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:24,869 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 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:32:24,877 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:32:24,877 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:32:24,997 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 19:32:24,997 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:32:25,000 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:32:26,051 INFO L134 CoverageAnalysis]: Checked inductivity of 13689 backedges. 6806 proven. 552 refuted. 0 times theorem prover too weak. 6331 trivial. 0 not checked. [2018-12-03 19:32:26,052 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:32:27,693 INFO L134 CoverageAnalysis]: Checked inductivity of 13689 backedges. 6806 proven. 552 refuted. 0 times theorem prover too weak. 6331 trivial. 0 not checked. [2018-12-03 19:32:27,711 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:32:27,712 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 27, 27] total 132 [2018-12-03 19:32:27,712 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:32:27,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-12-03 19:32:27,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-12-03 19:32:27,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4646, Invalid=12646, Unknown=0, NotChecked=0, Total=17292 [2018-12-03 19:32:27,713 INFO L87 Difference]: Start difference. First operand 1985 states and 2071 transitions. Second operand 107 states. [2018-12-03 19:32:33,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:32:33,542 INFO L93 Difference]: Finished difference Result 3912 states and 4100 transitions. [2018-12-03 19:32:33,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2018-12-03 19:32:33,542 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 236 [2018-12-03 19:32:33,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:32:33,543 INFO L225 Difference]: With dead ends: 3912 [2018-12-03 19:32:33,543 INFO L226 Difference]: Without dead ends: 2087 [2018-12-03 19:32:33,546 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 421 SyntacticMatches, 0 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10690 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=17030, Invalid=38430, Unknown=0, NotChecked=0, Total=55460 [2018-12-03 19:32:33,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2087 states. [2018-12-03 19:32:33,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2087 to 2063. [2018-12-03 19:32:33,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2063 states. [2018-12-03 19:32:33,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2063 states to 2063 states and 2151 transitions. [2018-12-03 19:32:33,583 INFO L78 Accepts]: Start accepts. Automaton has 2063 states and 2151 transitions. Word has length 236 [2018-12-03 19:32:33,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:32:33,583 INFO L480 AbstractCegarLoop]: Abstraction has 2063 states and 2151 transitions. [2018-12-03 19:32:33,583 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-12-03 19:32:33,583 INFO L276 IsEmpty]: Start isEmpty. Operand 2063 states and 2151 transitions. [2018-12-03 19:32:33,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2018-12-03 19:32:33,585 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:32:33,585 INFO L402 BasicCegarLoop]: trace histogram [117, 116, 2, 1, 1, 1] [2018-12-03 19:32:33,585 INFO L423 AbstractCegarLoop]: === Iteration 84 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:32:33,585 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:32:33,585 INFO L82 PathProgramCache]: Analyzing trace with hash 526346896, now seen corresponding path program 81 times [2018-12-03 19:32:33,586 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:32:33,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:33,586 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:32:33,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:33,586 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:32:33,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:32:36,025 INFO L134 CoverageAnalysis]: Checked inductivity of 13924 backedges. 6118 proven. 6400 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:32:36,025 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:36,026 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:32:36,026 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:32:36,026 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:32:36,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:36,026 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 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:32:36,035 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:32:36,035 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:32:36,125 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:32:36,125 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:32:36,129 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:32:36,211 INFO L134 CoverageAnalysis]: Checked inductivity of 13924 backedges. 6118 proven. 6400 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:32:36,211 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:32:43,588 INFO L134 CoverageAnalysis]: Checked inductivity of 13924 backedges. 6118 proven. 6400 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:32:43,607 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:32:43,607 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82, 82] total 163 [2018-12-03 19:32:43,607 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:32:43,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 19:32:43,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 19:32:43,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13366, Invalid=13366, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 19:32:43,610 INFO L87 Difference]: Start difference. First operand 2063 states and 2151 transitions. Second operand 83 states. [2018-12-03 19:32:43,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:32:43,811 INFO L93 Difference]: Finished difference Result 3966 states and 4142 transitions. [2018-12-03 19:32:43,812 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 19:32:43,812 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 238 [2018-12-03 19:32:43,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:32:43,813 INFO L225 Difference]: With dead ends: 3966 [2018-12-03 19:32:43,813 INFO L226 Difference]: Without dead ends: 2065 [2018-12-03 19:32:43,816 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 394 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=13366, Invalid=13366, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 19:32:43,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2065 states. [2018-12-03 19:32:43,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2065 to 2065. [2018-12-03 19:32:43,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2065 states. [2018-12-03 19:32:43,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2065 states to 2065 states and 2153 transitions. [2018-12-03 19:32:43,853 INFO L78 Accepts]: Start accepts. Automaton has 2065 states and 2153 transitions. Word has length 238 [2018-12-03 19:32:43,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:32:43,853 INFO L480 AbstractCegarLoop]: Abstraction has 2065 states and 2153 transitions. [2018-12-03 19:32:43,853 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 19:32:43,854 INFO L276 IsEmpty]: Start isEmpty. Operand 2065 states and 2153 transitions. [2018-12-03 19:32:43,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2018-12-03 19:32:43,855 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:32:43,856 INFO L402 BasicCegarLoop]: trace histogram [118, 117, 2, 1, 1, 1] [2018-12-03 19:32:43,856 INFO L423 AbstractCegarLoop]: === Iteration 85 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:32:43,856 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:32:43,856 INFO L82 PathProgramCache]: Analyzing trace with hash 1571249930, now seen corresponding path program 82 times [2018-12-03 19:32:43,856 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:32:43,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:43,857 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:32:43,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:43,857 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:32:43,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:32:46,339 INFO L134 CoverageAnalysis]: Checked inductivity of 14161 backedges. 6194 proven. 6561 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:32:46,339 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:46,339 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:32:46,339 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:32:46,340 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:32:46,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:46,340 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:32:46,349 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:32:46,349 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:32:46,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:32:46,441 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:32:46,483 INFO L134 CoverageAnalysis]: Checked inductivity of 14161 backedges. 6194 proven. 6561 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:32:46,483 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:32:53,939 INFO L134 CoverageAnalysis]: Checked inductivity of 14161 backedges. 6194 proven. 6561 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:32:53,958 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:32:53,958 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 165 [2018-12-03 19:32:53,958 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:32:53,958 INFO L459 AbstractCegarLoop]: Interpolant automaton has 84 states [2018-12-03 19:32:53,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2018-12-03 19:32:53,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13695, Invalid=13695, Unknown=0, NotChecked=0, Total=27390 [2018-12-03 19:32:53,961 INFO L87 Difference]: Start difference. First operand 2065 states and 2153 transitions. Second operand 84 states. [2018-12-03 19:32:54,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:32:54,152 INFO L93 Difference]: Finished difference Result 3968 states and 4144 transitions. [2018-12-03 19:32:54,152 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2018-12-03 19:32:54,152 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 240 [2018-12-03 19:32:54,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:32:54,153 INFO L225 Difference]: With dead ends: 3968 [2018-12-03 19:32:54,154 INFO L226 Difference]: Without dead ends: 2067 [2018-12-03 19:32:54,156 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 561 GetRequests, 397 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=13695, Invalid=13695, Unknown=0, NotChecked=0, Total=27390 [2018-12-03 19:32:54,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2067 states. [2018-12-03 19:32:54,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2067 to 2067. [2018-12-03 19:32:54,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2067 states. [2018-12-03 19:32:54,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2067 states to 2067 states and 2155 transitions. [2018-12-03 19:32:54,196 INFO L78 Accepts]: Start accepts. Automaton has 2067 states and 2155 transitions. Word has length 240 [2018-12-03 19:32:54,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:32:54,197 INFO L480 AbstractCegarLoop]: Abstraction has 2067 states and 2155 transitions. [2018-12-03 19:32:54,197 INFO L481 AbstractCegarLoop]: Interpolant automaton has 84 states. [2018-12-03 19:32:54,197 INFO L276 IsEmpty]: Start isEmpty. Operand 2067 states and 2155 transitions. [2018-12-03 19:32:54,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2018-12-03 19:32:54,199 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:32:54,199 INFO L402 BasicCegarLoop]: trace histogram [119, 118, 2, 1, 1, 1] [2018-12-03 19:32:54,199 INFO L423 AbstractCegarLoop]: === Iteration 86 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:32:54,199 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:32:54,199 INFO L82 PathProgramCache]: Analyzing trace with hash 700718340, now seen corresponding path program 83 times [2018-12-03 19:32:54,200 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:32:54,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:54,200 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:32:54,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:32:54,200 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:32:54,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:32:56,724 INFO L134 CoverageAnalysis]: Checked inductivity of 14400 backedges. 6270 proven. 6724 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:32:56,725 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:56,725 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:32:56,725 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:32:56,725 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:32:56,725 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:32:56,725 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 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:32:56,733 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:32:56,733 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:32:56,861 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 19:32:56,862 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:32:56,865 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:32:58,247 INFO L134 CoverageAnalysis]: Checked inductivity of 14400 backedges. 7014 proven. 600 refuted. 0 times theorem prover too weak. 6786 trivial. 0 not checked. [2018-12-03 19:32:58,248 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:32:59,752 INFO L134 CoverageAnalysis]: Checked inductivity of 14400 backedges. 7014 proven. 600 refuted. 0 times theorem prover too weak. 6786 trivial. 0 not checked. [2018-12-03 19:32:59,770 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:32:59,771 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 28, 28] total 137 [2018-12-03 19:32:59,771 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:32:59,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 111 states [2018-12-03 19:32:59,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2018-12-03 19:32:59,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5000, Invalid=13632, Unknown=0, NotChecked=0, Total=18632 [2018-12-03 19:32:59,773 INFO L87 Difference]: Start difference. First operand 2067 states and 2155 transitions. Second operand 111 states. [2018-12-03 19:33:05,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:33:05,928 INFO L93 Difference]: Finished difference Result 4071 states and 4262 transitions. [2018-12-03 19:33:05,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2018-12-03 19:33:05,928 INFO L78 Accepts]: Start accepts. Automaton has 111 states. Word has length 242 [2018-12-03 19:33:05,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:33:05,929 INFO L225 Difference]: With dead ends: 4071 [2018-12-03 19:33:05,930 INFO L226 Difference]: Without dead ends: 2170 [2018-12-03 19:33:05,933 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 674 GetRequests, 431 SyntacticMatches, 0 SemanticMatches, 243 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11534 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=18346, Invalid=41434, Unknown=0, NotChecked=0, Total=59780 [2018-12-03 19:33:05,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2170 states. [2018-12-03 19:33:05,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2170 to 2145. [2018-12-03 19:33:05,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2145 states. [2018-12-03 19:33:05,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2145 states to 2145 states and 2235 transitions. [2018-12-03 19:33:05,972 INFO L78 Accepts]: Start accepts. Automaton has 2145 states and 2235 transitions. Word has length 242 [2018-12-03 19:33:05,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:33:05,973 INFO L480 AbstractCegarLoop]: Abstraction has 2145 states and 2235 transitions. [2018-12-03 19:33:05,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has 111 states. [2018-12-03 19:33:05,973 INFO L276 IsEmpty]: Start isEmpty. Operand 2145 states and 2235 transitions. [2018-12-03 19:33:05,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2018-12-03 19:33:05,975 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:33:05,975 INFO L402 BasicCegarLoop]: trace histogram [120, 119, 2, 1, 1, 1] [2018-12-03 19:33:05,975 INFO L423 AbstractCegarLoop]: === Iteration 87 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:33:05,975 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:33:05,976 INFO L82 PathProgramCache]: Analyzing trace with hash 1834536190, now seen corresponding path program 84 times [2018-12-03 19:33:05,976 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:33:05,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:05,976 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:33:05,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:05,976 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:33:06,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:08,689 INFO L134 CoverageAnalysis]: Checked inductivity of 14641 backedges. 6346 proven. 6889 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:33:08,689 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:08,689 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:33:08,690 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:33:08,690 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:33:08,690 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:08,690 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 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:33:08,701 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:33:08,701 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:33:08,794 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:33:08,794 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:33:08,798 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:33:08,900 INFO L134 CoverageAnalysis]: Checked inductivity of 14641 backedges. 6346 proven. 6889 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:33:08,900 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:33:16,439 INFO L134 CoverageAnalysis]: Checked inductivity of 14641 backedges. 6346 proven. 6889 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:33:16,458 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:33:16,459 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 169 [2018-12-03 19:33:16,459 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:33:16,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-03 19:33:16,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-03 19:33:16,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14365, Invalid=14365, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 19:33:16,461 INFO L87 Difference]: Start difference. First operand 2145 states and 2235 transitions. Second operand 86 states. [2018-12-03 19:33:16,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:33:16,660 INFO L93 Difference]: Finished difference Result 4124 states and 4304 transitions. [2018-12-03 19:33:16,660 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-12-03 19:33:16,660 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 244 [2018-12-03 19:33:16,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:33:16,662 INFO L225 Difference]: With dead ends: 4124 [2018-12-03 19:33:16,662 INFO L226 Difference]: Without dead ends: 2147 [2018-12-03 19:33:16,664 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 403 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=14365, Invalid=14365, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 19:33:16,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2147 states. [2018-12-03 19:33:16,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2147 to 2147. [2018-12-03 19:33:16,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2147 states. [2018-12-03 19:33:16,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2147 states to 2147 states and 2237 transitions. [2018-12-03 19:33:16,702 INFO L78 Accepts]: Start accepts. Automaton has 2147 states and 2237 transitions. Word has length 244 [2018-12-03 19:33:16,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:33:16,702 INFO L480 AbstractCegarLoop]: Abstraction has 2147 states and 2237 transitions. [2018-12-03 19:33:16,703 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-03 19:33:16,703 INFO L276 IsEmpty]: Start isEmpty. Operand 2147 states and 2237 transitions. [2018-12-03 19:33:16,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2018-12-03 19:33:16,705 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:33:16,705 INFO L402 BasicCegarLoop]: trace histogram [121, 120, 2, 1, 1, 1] [2018-12-03 19:33:16,705 INFO L423 AbstractCegarLoop]: === Iteration 88 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:33:16,705 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:33:16,706 INFO L82 PathProgramCache]: Analyzing trace with hash 1083309560, now seen corresponding path program 85 times [2018-12-03 19:33:16,706 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:33:16,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:16,706 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:33:16,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:16,706 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:33:16,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:19,558 INFO L134 CoverageAnalysis]: Checked inductivity of 14884 backedges. 6422 proven. 7056 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:33:19,558 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:19,559 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:33:19,559 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:33:19,559 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:33:19,559 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:19,559 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 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:33:19,567 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:33:19,568 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:33:19,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:19,662 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:33:19,723 INFO L134 CoverageAnalysis]: Checked inductivity of 14884 backedges. 6422 proven. 7056 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:33:19,723 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:33:27,334 INFO L134 CoverageAnalysis]: Checked inductivity of 14884 backedges. 6422 proven. 7056 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:33:27,353 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:33:27,354 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86, 86] total 171 [2018-12-03 19:33:27,354 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:33:27,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-12-03 19:33:27,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-12-03 19:33:27,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14706, Invalid=14706, Unknown=0, NotChecked=0, Total=29412 [2018-12-03 19:33:27,356 INFO L87 Difference]: Start difference. First operand 2147 states and 2237 transitions. Second operand 87 states. [2018-12-03 19:33:27,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:33:27,641 INFO L93 Difference]: Finished difference Result 4126 states and 4306 transitions. [2018-12-03 19:33:27,641 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-12-03 19:33:27,641 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 246 [2018-12-03 19:33:27,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:33:27,642 INFO L225 Difference]: With dead ends: 4126 [2018-12-03 19:33:27,643 INFO L226 Difference]: Without dead ends: 2149 [2018-12-03 19:33:27,644 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 576 GetRequests, 406 SyntacticMatches, 0 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=14706, Invalid=14706, Unknown=0, NotChecked=0, Total=29412 [2018-12-03 19:33:27,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2149 states. [2018-12-03 19:33:27,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2149 to 2149. [2018-12-03 19:33:27,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2149 states. [2018-12-03 19:33:27,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2149 states to 2149 states and 2239 transitions. [2018-12-03 19:33:27,682 INFO L78 Accepts]: Start accepts. Automaton has 2149 states and 2239 transitions. Word has length 246 [2018-12-03 19:33:27,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:33:27,682 INFO L480 AbstractCegarLoop]: Abstraction has 2149 states and 2239 transitions. [2018-12-03 19:33:27,682 INFO L481 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-12-03 19:33:27,683 INFO L276 IsEmpty]: Start isEmpty. Operand 2149 states and 2239 transitions. [2018-12-03 19:33:27,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2018-12-03 19:33:27,685 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:33:27,685 INFO L402 BasicCegarLoop]: trace histogram [122, 121, 2, 1, 1, 1] [2018-12-03 19:33:27,685 INFO L423 AbstractCegarLoop]: === Iteration 89 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:33:27,685 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:33:27,685 INFO L82 PathProgramCache]: Analyzing trace with hash 709023858, now seen corresponding path program 86 times [2018-12-03 19:33:27,686 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:33:27,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:27,686 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:33:27,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:27,686 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:33:27,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:30,611 INFO L134 CoverageAnalysis]: Checked inductivity of 15129 backedges. 6498 proven. 7225 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:33:30,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:30,612 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:33:30,612 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:33:30,612 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:33:30,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:30,612 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 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:33:30,622 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:33:30,622 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:33:30,740 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 19:33:30,741 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:33:30,743 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:33:31,929 INFO L134 CoverageAnalysis]: Checked inductivity of 15129 backedges. 7218 proven. 650 refuted. 0 times theorem prover too weak. 7261 trivial. 0 not checked. [2018-12-03 19:33:31,929 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:33:33,886 INFO L134 CoverageAnalysis]: Checked inductivity of 15129 backedges. 7218 proven. 650 refuted. 0 times theorem prover too weak. 7261 trivial. 0 not checked. [2018-12-03 19:33:33,905 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:33:33,905 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 29, 29] total 142 [2018-12-03 19:33:33,905 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:33:33,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 115 states [2018-12-03 19:33:33,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2018-12-03 19:33:33,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5367, Invalid=14655, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 19:33:33,907 INFO L87 Difference]: Start difference. First operand 2149 states and 2239 transitions. Second operand 115 states. [2018-12-03 19:33:40,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:33:40,478 INFO L93 Difference]: Finished difference Result 4230 states and 4424 transitions. [2018-12-03 19:33:40,478 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 141 states. [2018-12-03 19:33:40,478 INFO L78 Accepts]: Start accepts. Automaton has 115 states. Word has length 248 [2018-12-03 19:33:40,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:33:40,480 INFO L225 Difference]: With dead ends: 4230 [2018-12-03 19:33:40,480 INFO L226 Difference]: Without dead ends: 2253 [2018-12-03 19:33:40,483 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 693 GetRequests, 441 SyntacticMatches, 0 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12410 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=19711, Invalid=44551, Unknown=0, NotChecked=0, Total=64262 [2018-12-03 19:33:40,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2253 states. [2018-12-03 19:33:40,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2253 to 2227. [2018-12-03 19:33:40,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2227 states. [2018-12-03 19:33:40,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2227 states to 2227 states and 2319 transitions. [2018-12-03 19:33:40,526 INFO L78 Accepts]: Start accepts. Automaton has 2227 states and 2319 transitions. Word has length 248 [2018-12-03 19:33:40,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:33:40,527 INFO L480 AbstractCegarLoop]: Abstraction has 2227 states and 2319 transitions. [2018-12-03 19:33:40,527 INFO L481 AbstractCegarLoop]: Interpolant automaton has 115 states. [2018-12-03 19:33:40,527 INFO L276 IsEmpty]: Start isEmpty. Operand 2227 states and 2319 transitions. [2018-12-03 19:33:40,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2018-12-03 19:33:40,528 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:33:40,528 INFO L402 BasicCegarLoop]: trace histogram [123, 122, 2, 1, 1, 1] [2018-12-03 19:33:40,528 INFO L423 AbstractCegarLoop]: === Iteration 90 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:33:40,529 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:33:40,529 INFO L82 PathProgramCache]: Analyzing trace with hash 1444848876, now seen corresponding path program 87 times [2018-12-03 19:33:40,529 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:33:40,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:40,529 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:33:40,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:40,530 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:33:40,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:43,237 INFO L134 CoverageAnalysis]: Checked inductivity of 15376 backedges. 6574 proven. 7396 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:33:43,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:43,237 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:33:43,238 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:33:43,238 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:33:43,238 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:43,238 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 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:33:43,250 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:33:43,250 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:33:43,345 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:33:43,346 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:33:43,350 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:33:43,395 INFO L134 CoverageAnalysis]: Checked inductivity of 15376 backedges. 6574 proven. 7396 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:33:43,395 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:33:51,692 INFO L134 CoverageAnalysis]: Checked inductivity of 15376 backedges. 6574 proven. 7396 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:33:51,712 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:33:51,712 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88, 88] total 175 [2018-12-03 19:33:51,712 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:33:51,713 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 19:33:51,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 19:33:51,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15400, Invalid=15400, Unknown=0, NotChecked=0, Total=30800 [2018-12-03 19:33:51,715 INFO L87 Difference]: Start difference. First operand 2227 states and 2319 transitions. Second operand 89 states. [2018-12-03 19:33:52,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:33:52,046 INFO L93 Difference]: Finished difference Result 4282 states and 4466 transitions. [2018-12-03 19:33:52,046 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-12-03 19:33:52,046 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 250 [2018-12-03 19:33:52,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:33:52,047 INFO L225 Difference]: With dead ends: 4282 [2018-12-03 19:33:52,047 INFO L226 Difference]: Without dead ends: 2229 [2018-12-03 19:33:52,049 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 412 SyntacticMatches, 0 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=15400, Invalid=15400, Unknown=0, NotChecked=0, Total=30800 [2018-12-03 19:33:52,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2229 states. [2018-12-03 19:33:52,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2229 to 2229. [2018-12-03 19:33:52,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2229 states. [2018-12-03 19:33:52,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2229 states to 2229 states and 2321 transitions. [2018-12-03 19:33:52,087 INFO L78 Accepts]: Start accepts. Automaton has 2229 states and 2321 transitions. Word has length 250 [2018-12-03 19:33:52,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:33:52,087 INFO L480 AbstractCegarLoop]: Abstraction has 2229 states and 2321 transitions. [2018-12-03 19:33:52,087 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 19:33:52,087 INFO L276 IsEmpty]: Start isEmpty. Operand 2229 states and 2321 transitions. [2018-12-03 19:33:52,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2018-12-03 19:33:52,088 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:33:52,089 INFO L402 BasicCegarLoop]: trace histogram [124, 123, 2, 1, 1, 1] [2018-12-03 19:33:52,089 INFO L423 AbstractCegarLoop]: === Iteration 91 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:33:52,089 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:33:52,089 INFO L82 PathProgramCache]: Analyzing trace with hash -292965786, now seen corresponding path program 88 times [2018-12-03 19:33:52,089 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:33:52,089 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:52,089 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:33:52,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:33:52,090 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:33:52,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:55,144 INFO L134 CoverageAnalysis]: Checked inductivity of 15625 backedges. 6650 proven. 7569 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:33:55,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:55,144 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:33:55,145 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:33:55,145 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:33:55,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:33:55,145 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 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:33:55,153 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:33:55,153 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:33:55,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:33:55,251 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:33:55,296 INFO L134 CoverageAnalysis]: Checked inductivity of 15625 backedges. 6650 proven. 7569 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:33:55,297 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:34:03,393 INFO L134 CoverageAnalysis]: Checked inductivity of 15625 backedges. 6650 proven. 7569 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:34:03,412 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:34:03,412 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 177 [2018-12-03 19:34:03,412 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:34:03,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 90 states [2018-12-03 19:34:03,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2018-12-03 19:34:03,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15753, Invalid=15753, Unknown=0, NotChecked=0, Total=31506 [2018-12-03 19:34:03,414 INFO L87 Difference]: Start difference. First operand 2229 states and 2321 transitions. Second operand 90 states. [2018-12-03 19:34:03,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:34:03,638 INFO L93 Difference]: Finished difference Result 4284 states and 4468 transitions. [2018-12-03 19:34:03,639 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2018-12-03 19:34:03,639 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 252 [2018-12-03 19:34:03,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:34:03,640 INFO L225 Difference]: With dead ends: 4284 [2018-12-03 19:34:03,640 INFO L226 Difference]: Without dead ends: 2231 [2018-12-03 19:34:03,642 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 415 SyntacticMatches, 0 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=15753, Invalid=15753, Unknown=0, NotChecked=0, Total=31506 [2018-12-03 19:34:03,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2231 states. [2018-12-03 19:34:03,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2231 to 2231. [2018-12-03 19:34:03,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2231 states. [2018-12-03 19:34:03,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2231 states to 2231 states and 2323 transitions. [2018-12-03 19:34:03,683 INFO L78 Accepts]: Start accepts. Automaton has 2231 states and 2323 transitions. Word has length 252 [2018-12-03 19:34:03,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:34:03,683 INFO L480 AbstractCegarLoop]: Abstraction has 2231 states and 2323 transitions. [2018-12-03 19:34:03,683 INFO L481 AbstractCegarLoop]: Interpolant automaton has 90 states. [2018-12-03 19:34:03,683 INFO L276 IsEmpty]: Start isEmpty. Operand 2231 states and 2323 transitions. [2018-12-03 19:34:03,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2018-12-03 19:34:03,685 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:34:03,685 INFO L402 BasicCegarLoop]: trace histogram [125, 124, 2, 1, 1, 1] [2018-12-03 19:34:03,685 INFO L423 AbstractCegarLoop]: === Iteration 92 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:34:03,685 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:34:03,685 INFO L82 PathProgramCache]: Analyzing trace with hash 409422176, now seen corresponding path program 89 times [2018-12-03 19:34:03,685 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:34:03,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:03,686 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:34:03,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:03,686 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:34:03,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:34:06,953 INFO L134 CoverageAnalysis]: Checked inductivity of 15876 backedges. 6726 proven. 7744 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:34:06,953 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:06,953 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:34:06,953 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:34:06,953 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:34:06,953 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:06,953 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 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:34:06,962 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:34:06,962 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:34:07,081 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 19:34:07,081 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:34:07,084 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:34:08,301 INFO L134 CoverageAnalysis]: Checked inductivity of 15876 backedges. 7418 proven. 702 refuted. 0 times theorem prover too weak. 7756 trivial. 0 not checked. [2018-12-03 19:34:08,301 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:34:10,239 INFO L134 CoverageAnalysis]: Checked inductivity of 15876 backedges. 7418 proven. 702 refuted. 0 times theorem prover too weak. 7756 trivial. 0 not checked. [2018-12-03 19:34:10,259 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:34:10,259 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 30, 30] total 147 [2018-12-03 19:34:10,260 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:34:10,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2018-12-03 19:34:10,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2018-12-03 19:34:10,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5747, Invalid=15715, Unknown=0, NotChecked=0, Total=21462 [2018-12-03 19:34:10,262 INFO L87 Difference]: Start difference. First operand 2231 states and 2323 transitions. Second operand 119 states. [2018-12-03 19:34:17,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:34:17,222 INFO L93 Difference]: Finished difference Result 4389 states and 4586 transitions. [2018-12-03 19:34:17,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2018-12-03 19:34:17,222 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 254 [2018-12-03 19:34:17,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:34:17,224 INFO L225 Difference]: With dead ends: 4389 [2018-12-03 19:34:17,224 INFO L226 Difference]: Without dead ends: 2336 [2018-12-03 19:34:17,226 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 712 GetRequests, 451 SyntacticMatches, 0 SemanticMatches, 261 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13318 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=21125, Invalid=47781, Unknown=0, NotChecked=0, Total=68906 [2018-12-03 19:34:17,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2336 states. [2018-12-03 19:34:17,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2336 to 2309. [2018-12-03 19:34:17,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2309 states. [2018-12-03 19:34:17,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2309 states to 2309 states and 2403 transitions. [2018-12-03 19:34:17,268 INFO L78 Accepts]: Start accepts. Automaton has 2309 states and 2403 transitions. Word has length 254 [2018-12-03 19:34:17,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:34:17,268 INFO L480 AbstractCegarLoop]: Abstraction has 2309 states and 2403 transitions. [2018-12-03 19:34:17,268 INFO L481 AbstractCegarLoop]: Interpolant automaton has 119 states. [2018-12-03 19:34:17,268 INFO L276 IsEmpty]: Start isEmpty. Operand 2309 states and 2403 transitions. [2018-12-03 19:34:17,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2018-12-03 19:34:17,270 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:34:17,270 INFO L402 BasicCegarLoop]: trace histogram [126, 125, 2, 1, 1, 1] [2018-12-03 19:34:17,270 INFO L423 AbstractCegarLoop]: === Iteration 93 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:34:17,270 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:34:17,270 INFO L82 PathProgramCache]: Analyzing trace with hash 2130891354, now seen corresponding path program 90 times [2018-12-03 19:34:17,270 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:34:17,271 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:17,271 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:34:17,271 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:17,271 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:34:17,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:34:20,641 INFO L134 CoverageAnalysis]: Checked inductivity of 16129 backedges. 6802 proven. 7921 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:34:20,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:20,642 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:34:20,642 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:34:20,642 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:34:20,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:20,642 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 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:34:20,652 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:34:20,653 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:34:20,749 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:34:20,750 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:34:20,754 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:34:20,800 INFO L134 CoverageAnalysis]: Checked inductivity of 16129 backedges. 6802 proven. 7921 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:34:20,800 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:34:29,321 INFO L134 CoverageAnalysis]: Checked inductivity of 16129 backedges. 6802 proven. 7921 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:34:29,342 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:34:29,342 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 181 [2018-12-03 19:34:29,342 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:34:29,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-12-03 19:34:29,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-12-03 19:34:29,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16471, Invalid=16471, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 19:34:29,344 INFO L87 Difference]: Start difference. First operand 2309 states and 2403 transitions. Second operand 92 states. [2018-12-03 19:34:29,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:34:29,687 INFO L93 Difference]: Finished difference Result 4440 states and 4628 transitions. [2018-12-03 19:34:29,687 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2018-12-03 19:34:29,687 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 256 [2018-12-03 19:34:29,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:34:29,689 INFO L225 Difference]: With dead ends: 4440 [2018-12-03 19:34:29,689 INFO L226 Difference]: Without dead ends: 2311 [2018-12-03 19:34:29,690 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 421 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=16471, Invalid=16471, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 19:34:29,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2311 states. [2018-12-03 19:34:29,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2311 to 2311. [2018-12-03 19:34:29,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2311 states. [2018-12-03 19:34:29,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2311 states to 2311 states and 2405 transitions. [2018-12-03 19:34:29,733 INFO L78 Accepts]: Start accepts. Automaton has 2311 states and 2405 transitions. Word has length 256 [2018-12-03 19:34:29,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:34:29,733 INFO L480 AbstractCegarLoop]: Abstraction has 2311 states and 2405 transitions. [2018-12-03 19:34:29,733 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-12-03 19:34:29,733 INFO L276 IsEmpty]: Start isEmpty. Operand 2311 states and 2405 transitions. [2018-12-03 19:34:29,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-12-03 19:34:29,735 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:34:29,735 INFO L402 BasicCegarLoop]: trace histogram [127, 126, 2, 1, 1, 1] [2018-12-03 19:34:29,735 INFO L423 AbstractCegarLoop]: === Iteration 94 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:34:29,735 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:34:29,736 INFO L82 PathProgramCache]: Analyzing trace with hash -1041736620, now seen corresponding path program 91 times [2018-12-03 19:34:29,736 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:34:29,736 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:29,736 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:34:29,736 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:29,737 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:34:29,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:34:32,877 INFO L134 CoverageAnalysis]: Checked inductivity of 16384 backedges. 6878 proven. 8100 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:34:32,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:32,877 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:34:32,877 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:34:32,878 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:34:32,878 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:32,878 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 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:34:32,888 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:34:32,888 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:34:32,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:34:32,989 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:34:33,036 INFO L134 CoverageAnalysis]: Checked inductivity of 16384 backedges. 6878 proven. 8100 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:34:33,037 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:34:41,922 INFO L134 CoverageAnalysis]: Checked inductivity of 16384 backedges. 6878 proven. 8100 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:34:41,940 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:34:41,941 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92, 92] total 183 [2018-12-03 19:34:41,941 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:34:41,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2018-12-03 19:34:41,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2018-12-03 19:34:41,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16836, Invalid=16836, Unknown=0, NotChecked=0, Total=33672 [2018-12-03 19:34:41,943 INFO L87 Difference]: Start difference. First operand 2311 states and 2405 transitions. Second operand 93 states. [2018-12-03 19:34:42,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:34:42,174 INFO L93 Difference]: Finished difference Result 4442 states and 4630 transitions. [2018-12-03 19:34:42,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-12-03 19:34:42,175 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 258 [2018-12-03 19:34:42,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:34:42,176 INFO L225 Difference]: With dead ends: 4442 [2018-12-03 19:34:42,176 INFO L226 Difference]: Without dead ends: 2313 [2018-12-03 19:34:42,178 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 606 GetRequests, 424 SyntacticMatches, 0 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=16836, Invalid=16836, Unknown=0, NotChecked=0, Total=33672 [2018-12-03 19:34:42,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2313 states. [2018-12-03 19:34:42,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2313 to 2313. [2018-12-03 19:34:42,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2313 states. [2018-12-03 19:34:42,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2313 states to 2313 states and 2407 transitions. [2018-12-03 19:34:42,219 INFO L78 Accepts]: Start accepts. Automaton has 2313 states and 2407 transitions. Word has length 258 [2018-12-03 19:34:42,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:34:42,219 INFO L480 AbstractCegarLoop]: Abstraction has 2313 states and 2407 transitions. [2018-12-03 19:34:42,219 INFO L481 AbstractCegarLoop]: Interpolant automaton has 93 states. [2018-12-03 19:34:42,220 INFO L276 IsEmpty]: Start isEmpty. Operand 2313 states and 2407 transitions. [2018-12-03 19:34:42,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2018-12-03 19:34:42,221 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:34:42,221 INFO L402 BasicCegarLoop]: trace histogram [128, 127, 2, 1, 1, 1] [2018-12-03 19:34:42,221 INFO L423 AbstractCegarLoop]: === Iteration 95 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:34:42,221 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:34:42,222 INFO L82 PathProgramCache]: Analyzing trace with hash -510439474, now seen corresponding path program 92 times [2018-12-03 19:34:42,222 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:34:42,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:42,222 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:34:42,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:42,222 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:34:42,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:34:45,525 INFO L134 CoverageAnalysis]: Checked inductivity of 16641 backedges. 6954 proven. 8281 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:34:45,525 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:45,525 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:34:45,526 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:34:45,526 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:34:45,526 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:45,526 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 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:34:45,535 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:34:45,536 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:34:45,779 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 19:34:45,780 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:34:45,782 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:34:47,045 INFO L134 CoverageAnalysis]: Checked inductivity of 16641 backedges. 7614 proven. 756 refuted. 0 times theorem prover too weak. 8271 trivial. 0 not checked. [2018-12-03 19:34:47,045 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:34:48,887 INFO L134 CoverageAnalysis]: Checked inductivity of 16641 backedges. 7614 proven. 756 refuted. 0 times theorem prover too weak. 8271 trivial. 0 not checked. [2018-12-03 19:34:48,946 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:34:48,946 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 31, 31] total 152 [2018-12-03 19:34:48,946 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:34:48,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 123 states [2018-12-03 19:34:48,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2018-12-03 19:34:48,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6140, Invalid=16812, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 19:34:48,948 INFO L87 Difference]: Start difference. First operand 2313 states and 2407 transitions. Second operand 123 states. [2018-12-03 19:34:56,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:34:56,581 INFO L93 Difference]: Finished difference Result 4548 states and 4748 transitions. [2018-12-03 19:34:56,582 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2018-12-03 19:34:56,582 INFO L78 Accepts]: Start accepts. Automaton has 123 states. Word has length 260 [2018-12-03 19:34:56,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:34:56,583 INFO L225 Difference]: With dead ends: 4548 [2018-12-03 19:34:56,583 INFO L226 Difference]: Without dead ends: 2419 [2018-12-03 19:34:56,585 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 731 GetRequests, 461 SyntacticMatches, 0 SemanticMatches, 270 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14258 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=22588, Invalid=51124, Unknown=0, NotChecked=0, Total=73712 [2018-12-03 19:34:56,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2419 states. [2018-12-03 19:34:56,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2419 to 2391. [2018-12-03 19:34:56,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2391 states. [2018-12-03 19:34:56,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2391 states to 2391 states and 2487 transitions. [2018-12-03 19:34:56,627 INFO L78 Accepts]: Start accepts. Automaton has 2391 states and 2487 transitions. Word has length 260 [2018-12-03 19:34:56,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:34:56,627 INFO L480 AbstractCegarLoop]: Abstraction has 2391 states and 2487 transitions. [2018-12-03 19:34:56,627 INFO L481 AbstractCegarLoop]: Interpolant automaton has 123 states. [2018-12-03 19:34:56,627 INFO L276 IsEmpty]: Start isEmpty. Operand 2391 states and 2487 transitions. [2018-12-03 19:34:56,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2018-12-03 19:34:56,628 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:34:56,629 INFO L402 BasicCegarLoop]: trace histogram [129, 128, 2, 1, 1, 1] [2018-12-03 19:34:56,629 INFO L423 AbstractCegarLoop]: === Iteration 96 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:34:56,629 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:34:56,629 INFO L82 PathProgramCache]: Analyzing trace with hash 141505864, now seen corresponding path program 93 times [2018-12-03 19:34:56,629 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:34:56,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:56,630 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:34:56,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:34:56,630 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:34:56,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:34:59,702 INFO L134 CoverageAnalysis]: Checked inductivity of 16900 backedges. 7030 proven. 8464 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:34:59,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:59,702 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:34:59,702 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:34:59,702 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:34:59,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:34:59,702 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 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:34:59,764 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:34:59,764 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:34:59,863 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:34:59,863 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:34:59,868 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:34:59,926 INFO L134 CoverageAnalysis]: Checked inductivity of 16900 backedges. 7030 proven. 8464 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:34:59,926 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:35:09,317 INFO L134 CoverageAnalysis]: Checked inductivity of 16900 backedges. 7030 proven. 8464 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:35:09,336 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:35:09,336 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94, 94] total 187 [2018-12-03 19:35:09,336 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:35:09,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 19:35:09,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 19:35:09,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17578, Invalid=17578, Unknown=0, NotChecked=0, Total=35156 [2018-12-03 19:35:09,339 INFO L87 Difference]: Start difference. First operand 2391 states and 2487 transitions. Second operand 95 states. [2018-12-03 19:35:09,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:35:09,598 INFO L93 Difference]: Finished difference Result 4598 states and 4790 transitions. [2018-12-03 19:35:09,598 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 19:35:09,598 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 262 [2018-12-03 19:35:09,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:35:09,600 INFO L225 Difference]: With dead ends: 4598 [2018-12-03 19:35:09,600 INFO L226 Difference]: Without dead ends: 2393 [2018-12-03 19:35:09,602 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 616 GetRequests, 430 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=17578, Invalid=17578, Unknown=0, NotChecked=0, Total=35156 [2018-12-03 19:35:09,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2393 states. [2018-12-03 19:35:09,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2393 to 2393. [2018-12-03 19:35:09,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2393 states. [2018-12-03 19:35:09,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2393 states to 2393 states and 2489 transitions. [2018-12-03 19:35:09,645 INFO L78 Accepts]: Start accepts. Automaton has 2393 states and 2489 transitions. Word has length 262 [2018-12-03 19:35:09,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:35:09,646 INFO L480 AbstractCegarLoop]: Abstraction has 2393 states and 2489 transitions. [2018-12-03 19:35:09,646 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 19:35:09,646 INFO L276 IsEmpty]: Start isEmpty. Operand 2393 states and 2489 transitions. [2018-12-03 19:35:09,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-12-03 19:35:09,647 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:35:09,647 INFO L402 BasicCegarLoop]: trace histogram [130, 129, 2, 1, 1, 1] [2018-12-03 19:35:09,647 INFO L423 AbstractCegarLoop]: === Iteration 97 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:35:09,648 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:35:09,648 INFO L82 PathProgramCache]: Analyzing trace with hash -1440752702, now seen corresponding path program 94 times [2018-12-03 19:35:09,648 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:35:09,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:09,649 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:35:09,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:09,649 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:35:09,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:35:13,058 INFO L134 CoverageAnalysis]: Checked inductivity of 17161 backedges. 7106 proven. 8649 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:35:13,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:13,059 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:35:13,059 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:35:13,059 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:35:13,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:13,059 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 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:35:13,067 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:35:13,067 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:35:13,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:35:13,168 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:35:13,218 INFO L134 CoverageAnalysis]: Checked inductivity of 17161 backedges. 7106 proven. 8649 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:35:13,218 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:35:22,927 INFO L134 CoverageAnalysis]: Checked inductivity of 17161 backedges. 7106 proven. 8649 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:35:22,945 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:35:22,946 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 189 [2018-12-03 19:35:22,946 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:35:22,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2018-12-03 19:35:22,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2018-12-03 19:35:22,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17955, Invalid=17955, Unknown=0, NotChecked=0, Total=35910 [2018-12-03 19:35:22,948 INFO L87 Difference]: Start difference. First operand 2393 states and 2489 transitions. Second operand 96 states. [2018-12-03 19:35:23,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:35:23,281 INFO L93 Difference]: Finished difference Result 4600 states and 4792 transitions. [2018-12-03 19:35:23,282 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2018-12-03 19:35:23,282 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 264 [2018-12-03 19:35:23,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:35:23,283 INFO L225 Difference]: With dead ends: 4600 [2018-12-03 19:35:23,283 INFO L226 Difference]: Without dead ends: 2395 [2018-12-03 19:35:23,285 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 621 GetRequests, 433 SyntacticMatches, 0 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=17955, Invalid=17955, Unknown=0, NotChecked=0, Total=35910 [2018-12-03 19:35:23,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2395 states. [2018-12-03 19:35:23,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2395 to 2395. [2018-12-03 19:35:23,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2395 states. [2018-12-03 19:35:23,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2395 states to 2395 states and 2491 transitions. [2018-12-03 19:35:23,328 INFO L78 Accepts]: Start accepts. Automaton has 2395 states and 2491 transitions. Word has length 264 [2018-12-03 19:35:23,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:35:23,328 INFO L480 AbstractCegarLoop]: Abstraction has 2395 states and 2491 transitions. [2018-12-03 19:35:23,328 INFO L481 AbstractCegarLoop]: Interpolant automaton has 96 states. [2018-12-03 19:35:23,328 INFO L276 IsEmpty]: Start isEmpty. Operand 2395 states and 2491 transitions. [2018-12-03 19:35:23,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2018-12-03 19:35:23,330 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:35:23,330 INFO L402 BasicCegarLoop]: trace histogram [131, 130, 2, 1, 1, 1] [2018-12-03 19:35:23,330 INFO L423 AbstractCegarLoop]: === Iteration 98 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:35:23,330 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:35:23,330 INFO L82 PathProgramCache]: Analyzing trace with hash -1572811844, now seen corresponding path program 95 times [2018-12-03 19:35:23,330 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:35:23,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:23,331 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:35:23,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:23,331 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:35:23,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:35:26,983 INFO L134 CoverageAnalysis]: Checked inductivity of 17424 backedges. 7182 proven. 8836 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:35:26,984 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:26,984 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:35:26,984 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:35:26,984 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:35:26,984 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:26,984 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:35:26,993 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:35:26,993 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:35:27,115 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 19:35:27,116 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:35:27,118 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:35:28,476 INFO L134 CoverageAnalysis]: Checked inductivity of 17424 backedges. 7806 proven. 812 refuted. 0 times theorem prover too weak. 8806 trivial. 0 not checked. [2018-12-03 19:35:28,477 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:35:30,453 INFO L134 CoverageAnalysis]: Checked inductivity of 17424 backedges. 7806 proven. 812 refuted. 0 times theorem prover too weak. 8806 trivial. 0 not checked. [2018-12-03 19:35:30,472 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:35:30,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 32, 32] total 157 [2018-12-03 19:35:30,472 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:35:30,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 127 states [2018-12-03 19:35:30,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2018-12-03 19:35:30,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6546, Invalid=17946, Unknown=0, NotChecked=0, Total=24492 [2018-12-03 19:35:30,475 INFO L87 Difference]: Start difference. First operand 2395 states and 2491 transitions. Second operand 127 states. [2018-12-03 19:35:38,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:35:38,681 INFO L93 Difference]: Finished difference Result 4707 states and 4910 transitions. [2018-12-03 19:35:38,681 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 156 states. [2018-12-03 19:35:38,681 INFO L78 Accepts]: Start accepts. Automaton has 127 states. Word has length 266 [2018-12-03 19:35:38,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:35:38,683 INFO L225 Difference]: With dead ends: 4707 [2018-12-03 19:35:38,683 INFO L226 Difference]: Without dead ends: 2502 [2018-12-03 19:35:38,685 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 750 GetRequests, 471 SyntacticMatches, 0 SemanticMatches, 279 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15230 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=24100, Invalid=54580, Unknown=0, NotChecked=0, Total=78680 [2018-12-03 19:35:38,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2502 states. [2018-12-03 19:35:38,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2502 to 2473. [2018-12-03 19:35:38,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2473 states. [2018-12-03 19:35:38,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2473 states to 2473 states and 2571 transitions. [2018-12-03 19:35:38,743 INFO L78 Accepts]: Start accepts. Automaton has 2473 states and 2571 transitions. Word has length 266 [2018-12-03 19:35:38,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:35:38,743 INFO L480 AbstractCegarLoop]: Abstraction has 2473 states and 2571 transitions. [2018-12-03 19:35:38,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has 127 states. [2018-12-03 19:35:38,743 INFO L276 IsEmpty]: Start isEmpty. Operand 2473 states and 2571 transitions. [2018-12-03 19:35:38,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2018-12-03 19:35:38,744 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:35:38,745 INFO L402 BasicCegarLoop]: trace histogram [132, 131, 2, 1, 1, 1] [2018-12-03 19:35:38,745 INFO L423 AbstractCegarLoop]: === Iteration 99 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:35:38,745 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:35:38,745 INFO L82 PathProgramCache]: Analyzing trace with hash -605704778, now seen corresponding path program 96 times [2018-12-03 19:35:38,745 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:35:38,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:38,746 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:35:38,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:38,746 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:35:38,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:35:42,307 INFO L134 CoverageAnalysis]: Checked inductivity of 17689 backedges. 7258 proven. 9025 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:35:42,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:42,308 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:35:42,308 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:35:42,308 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:35:42,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:42,308 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:35:42,316 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:35:42,316 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:35:42,418 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:35:42,419 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:35:42,423 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:35:42,475 INFO L134 CoverageAnalysis]: Checked inductivity of 17689 backedges. 7258 proven. 9025 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:35:42,475 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:35:52,682 INFO L134 CoverageAnalysis]: Checked inductivity of 17689 backedges. 7258 proven. 9025 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:35:52,702 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:35:52,702 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 193 [2018-12-03 19:35:52,702 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:35:52,702 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2018-12-03 19:35:52,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2018-12-03 19:35:52,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18721, Invalid=18721, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 19:35:52,705 INFO L87 Difference]: Start difference. First operand 2473 states and 2571 transitions. Second operand 98 states. [2018-12-03 19:35:52,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:35:52,997 INFO L93 Difference]: Finished difference Result 4756 states and 4952 transitions. [2018-12-03 19:35:52,998 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2018-12-03 19:35:52,998 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 268 [2018-12-03 19:35:52,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:35:52,999 INFO L225 Difference]: With dead ends: 4756 [2018-12-03 19:35:52,999 INFO L226 Difference]: Without dead ends: 2475 [2018-12-03 19:35:53,002 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 631 GetRequests, 439 SyntacticMatches, 0 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=18721, Invalid=18721, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 19:35:53,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2475 states. [2018-12-03 19:35:53,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2475 to 2475. [2018-12-03 19:35:53,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2475 states. [2018-12-03 19:35:53,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2475 states to 2475 states and 2573 transitions. [2018-12-03 19:35:53,047 INFO L78 Accepts]: Start accepts. Automaton has 2475 states and 2573 transitions. Word has length 268 [2018-12-03 19:35:53,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:35:53,047 INFO L480 AbstractCegarLoop]: Abstraction has 2475 states and 2573 transitions. [2018-12-03 19:35:53,047 INFO L481 AbstractCegarLoop]: Interpolant automaton has 98 states. [2018-12-03 19:35:53,047 INFO L276 IsEmpty]: Start isEmpty. Operand 2475 states and 2573 transitions. [2018-12-03 19:35:53,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2018-12-03 19:35:53,048 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:35:53,049 INFO L402 BasicCegarLoop]: trace histogram [133, 132, 2, 1, 1, 1] [2018-12-03 19:35:53,049 INFO L423 AbstractCegarLoop]: === Iteration 100 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:35:53,049 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:35:53,049 INFO L82 PathProgramCache]: Analyzing trace with hash -105246544, now seen corresponding path program 97 times [2018-12-03 19:35:53,049 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:35:53,050 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:53,050 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:35:53,050 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:35:53,050 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:35:53,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:35:56,389 INFO L134 CoverageAnalysis]: Checked inductivity of 17956 backedges. 7334 proven. 9216 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:35:56,390 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:56,390 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:35:56,390 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:35:56,390 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:35:56,390 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:35:56,390 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:35:56,399 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:35:56,399 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:35:56,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:35:56,504 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:35:56,556 INFO L134 CoverageAnalysis]: Checked inductivity of 17956 backedges. 7334 proven. 9216 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:35:56,557 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:36:06,785 INFO L134 CoverageAnalysis]: Checked inductivity of 17956 backedges. 7334 proven. 9216 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:36:06,803 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:36:06,803 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98, 98] total 195 [2018-12-03 19:36:06,803 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:36:06,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-12-03 19:36:06,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-12-03 19:36:06,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19110, Invalid=19110, Unknown=0, NotChecked=0, Total=38220 [2018-12-03 19:36:06,807 INFO L87 Difference]: Start difference. First operand 2475 states and 2573 transitions. Second operand 99 states. [2018-12-03 19:36:07,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:36:07,199 INFO L93 Difference]: Finished difference Result 4758 states and 4954 transitions. [2018-12-03 19:36:07,199 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 19:36:07,199 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 270 [2018-12-03 19:36:07,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:36:07,201 INFO L225 Difference]: With dead ends: 4758 [2018-12-03 19:36:07,201 INFO L226 Difference]: Without dead ends: 2477 [2018-12-03 19:36:07,203 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 636 GetRequests, 442 SyntacticMatches, 0 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=19110, Invalid=19110, Unknown=0, NotChecked=0, Total=38220 [2018-12-03 19:36:07,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2477 states. [2018-12-03 19:36:07,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2477 to 2477. [2018-12-03 19:36:07,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2477 states. [2018-12-03 19:36:07,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2477 states to 2477 states and 2575 transitions. [2018-12-03 19:36:07,247 INFO L78 Accepts]: Start accepts. Automaton has 2477 states and 2575 transitions. Word has length 270 [2018-12-03 19:36:07,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:36:07,247 INFO L480 AbstractCegarLoop]: Abstraction has 2477 states and 2575 transitions. [2018-12-03 19:36:07,247 INFO L481 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-12-03 19:36:07,248 INFO L276 IsEmpty]: Start isEmpty. Operand 2477 states and 2575 transitions. [2018-12-03 19:36:07,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2018-12-03 19:36:07,249 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:36:07,249 INFO L402 BasicCegarLoop]: trace histogram [134, 133, 2, 1, 1, 1] [2018-12-03 19:36:07,249 INFO L423 AbstractCegarLoop]: === Iteration 101 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:36:07,250 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:36:07,250 INFO L82 PathProgramCache]: Analyzing trace with hash -201220822, now seen corresponding path program 98 times [2018-12-03 19:36:07,250 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:36:07,250 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:36:07,250 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:36:07,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:36:07,251 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:36:07,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:36:10,738 INFO L134 CoverageAnalysis]: Checked inductivity of 18225 backedges. 7410 proven. 9409 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:36:10,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:36:10,738 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:36:10,738 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:36:10,738 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:36:10,739 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:36:10,739 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 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:36:10,747 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:36:10,747 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:36:10,867 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 19:36:10,867 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:36:10,870 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:36:12,643 INFO L134 CoverageAnalysis]: Checked inductivity of 18225 backedges. 7994 proven. 870 refuted. 0 times theorem prover too weak. 9361 trivial. 0 not checked. [2018-12-03 19:36:12,643 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:36:14,736 INFO L134 CoverageAnalysis]: Checked inductivity of 18225 backedges. 7994 proven. 870 refuted. 0 times theorem prover too weak. 9361 trivial. 0 not checked. [2018-12-03 19:36:14,754 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:36:14,754 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 33, 33] total 162 [2018-12-03 19:36:14,754 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:36:14,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2018-12-03 19:36:14,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2018-12-03 19:36:14,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6965, Invalid=19117, Unknown=0, NotChecked=0, Total=26082 [2018-12-03 19:36:14,757 INFO L87 Difference]: Start difference. First operand 2477 states and 2575 transitions. Second operand 131 states. [2018-12-03 19:36:23,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:36:23,019 INFO L93 Difference]: Finished difference Result 4866 states and 5072 transitions. [2018-12-03 19:36:23,019 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 161 states. [2018-12-03 19:36:23,020 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 272 [2018-12-03 19:36:23,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:36:23,021 INFO L225 Difference]: With dead ends: 4866 [2018-12-03 19:36:23,021 INFO L226 Difference]: Without dead ends: 2585 [2018-12-03 19:36:23,025 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 769 GetRequests, 481 SyntacticMatches, 0 SemanticMatches, 288 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16234 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=25661, Invalid=58149, Unknown=0, NotChecked=0, Total=83810 [2018-12-03 19:36:23,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2585 states. [2018-12-03 19:36:23,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2585 to 2555. [2018-12-03 19:36:23,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2555 states. [2018-12-03 19:36:23,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2555 states to 2555 states and 2655 transitions. [2018-12-03 19:36:23,084 INFO L78 Accepts]: Start accepts. Automaton has 2555 states and 2655 transitions. Word has length 272 [2018-12-03 19:36:23,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:36:23,084 INFO L480 AbstractCegarLoop]: Abstraction has 2555 states and 2655 transitions. [2018-12-03 19:36:23,084 INFO L481 AbstractCegarLoop]: Interpolant automaton has 131 states. [2018-12-03 19:36:23,085 INFO L276 IsEmpty]: Start isEmpty. Operand 2555 states and 2655 transitions. [2018-12-03 19:36:23,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2018-12-03 19:36:23,087 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:36:23,087 INFO L402 BasicCegarLoop]: trace histogram [135, 134, 2, 1, 1, 1] [2018-12-03 19:36:23,087 INFO L423 AbstractCegarLoop]: === Iteration 102 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:36:23,087 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:36:23,087 INFO L82 PathProgramCache]: Analyzing trace with hash 2046827428, now seen corresponding path program 99 times [2018-12-03 19:36:23,087 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:36:23,088 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:36:23,088 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:36:23,088 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:36:23,088 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:36:23,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:36:26,547 INFO L134 CoverageAnalysis]: Checked inductivity of 18496 backedges. 7486 proven. 9604 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:36:26,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:36:26,548 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:36:26,548 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:36:26,548 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:36:26,548 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:36:26,548 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 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:36:26,557 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:36:26,557 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:36:26,659 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:36:26,659 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:36:26,664 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:36:26,755 INFO L134 CoverageAnalysis]: Checked inductivity of 18496 backedges. 7486 proven. 9604 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:36:26,755 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:36:37,485 INFO L134 CoverageAnalysis]: Checked inductivity of 18496 backedges. 7486 proven. 9604 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:36:37,505 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:36:37,505 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100, 100] total 199 [2018-12-03 19:36:37,505 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:36:37,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 19:36:37,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 19:36:37,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19900, Invalid=19900, Unknown=0, NotChecked=0, Total=39800 [2018-12-03 19:36:37,508 INFO L87 Difference]: Start difference. First operand 2555 states and 2655 transitions. Second operand 101 states. [2018-12-03 19:36:38,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:36:38,035 INFO L93 Difference]: Finished difference Result 4914 states and 5114 transitions. [2018-12-03 19:36:38,035 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2018-12-03 19:36:38,035 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 274 [2018-12-03 19:36:38,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:36:38,037 INFO L225 Difference]: With dead ends: 4914 [2018-12-03 19:36:38,037 INFO L226 Difference]: Without dead ends: 2557 [2018-12-03 19:36:38,041 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 646 GetRequests, 448 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=19900, Invalid=19900, Unknown=0, NotChecked=0, Total=39800 [2018-12-03 19:36:38,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2557 states. [2018-12-03 19:36:38,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2557 to 2557. [2018-12-03 19:36:38,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2557 states. [2018-12-03 19:36:38,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2557 states to 2557 states and 2657 transitions. [2018-12-03 19:36:38,089 INFO L78 Accepts]: Start accepts. Automaton has 2557 states and 2657 transitions. Word has length 274 [2018-12-03 19:36:38,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:36:38,089 INFO L480 AbstractCegarLoop]: Abstraction has 2557 states and 2657 transitions. [2018-12-03 19:36:38,089 INFO L481 AbstractCegarLoop]: Interpolant automaton has 101 states. [2018-12-03 19:36:38,089 INFO L276 IsEmpty]: Start isEmpty. Operand 2557 states and 2657 transitions. [2018-12-03 19:36:38,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2018-12-03 19:36:38,091 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:36:38,091 INFO L402 BasicCegarLoop]: trace histogram [136, 135, 2, 1, 1, 1] [2018-12-03 19:36:38,091 INFO L423 AbstractCegarLoop]: === Iteration 103 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:36:38,091 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:36:38,092 INFO L82 PathProgramCache]: Analyzing trace with hash -1269245154, now seen corresponding path program 100 times [2018-12-03 19:36:38,092 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:36:38,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:36:38,092 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:36:38,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:36:38,093 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:36:38,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:36:41,695 INFO L134 CoverageAnalysis]: Checked inductivity of 18769 backedges. 7562 proven. 9801 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:36:41,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:36:41,695 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:36:41,695 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:36:41,696 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:36:41,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:36:41,696 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 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:36:41,705 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:36:41,705 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:36:41,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:36:41,814 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:36:41,868 INFO L134 CoverageAnalysis]: Checked inductivity of 18769 backedges. 7562 proven. 9801 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:36:41,869 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:36:52,840 INFO L134 CoverageAnalysis]: Checked inductivity of 18769 backedges. 7562 proven. 9801 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:36:52,860 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:36:52,860 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 201 [2018-12-03 19:36:52,861 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:36:52,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2018-12-03 19:36:52,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2018-12-03 19:36:52,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20301, Invalid=20301, Unknown=0, NotChecked=0, Total=40602 [2018-12-03 19:36:52,863 INFO L87 Difference]: Start difference. First operand 2557 states and 2657 transitions. Second operand 102 states. [2018-12-03 19:36:53,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:36:53,363 INFO L93 Difference]: Finished difference Result 4916 states and 5116 transitions. [2018-12-03 19:36:53,364 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2018-12-03 19:36:53,364 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 276 [2018-12-03 19:36:53,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:36:53,366 INFO L225 Difference]: With dead ends: 4916 [2018-12-03 19:36:53,366 INFO L226 Difference]: Without dead ends: 2559 [2018-12-03 19:36:53,368 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 651 GetRequests, 451 SyntacticMatches, 0 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=20301, Invalid=20301, Unknown=0, NotChecked=0, Total=40602 [2018-12-03 19:36:53,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2559 states. [2018-12-03 19:36:53,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2559 to 2559. [2018-12-03 19:36:53,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2559 states. [2018-12-03 19:36:53,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2559 states to 2559 states and 2659 transitions. [2018-12-03 19:36:53,422 INFO L78 Accepts]: Start accepts. Automaton has 2559 states and 2659 transitions. Word has length 276 [2018-12-03 19:36:53,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:36:53,423 INFO L480 AbstractCegarLoop]: Abstraction has 2559 states and 2659 transitions. [2018-12-03 19:36:53,423 INFO L481 AbstractCegarLoop]: Interpolant automaton has 102 states. [2018-12-03 19:36:53,423 INFO L276 IsEmpty]: Start isEmpty. Operand 2559 states and 2659 transitions. [2018-12-03 19:36:53,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2018-12-03 19:36:53,424 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:36:53,425 INFO L402 BasicCegarLoop]: trace histogram [137, 136, 2, 1, 1, 1] [2018-12-03 19:36:53,425 INFO L423 AbstractCegarLoop]: === Iteration 104 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:36:53,425 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:36:53,425 INFO L82 PathProgramCache]: Analyzing trace with hash -1149262824, now seen corresponding path program 101 times [2018-12-03 19:36:53,425 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:36:53,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:36:53,426 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:36:53,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:36:53,426 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:36:53,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:36:57,110 INFO L134 CoverageAnalysis]: Checked inductivity of 19044 backedges. 7638 proven. 10000 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:36:57,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:36:57,110 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:36:57,110 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:36:57,110 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:36:57,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:36:57,111 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 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:36:57,119 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:36:57,120 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:36:57,251 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 19:36:57,252 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:36:57,255 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:36:59,099 INFO L134 CoverageAnalysis]: Checked inductivity of 19044 backedges. 8178 proven. 930 refuted. 0 times theorem prover too weak. 9936 trivial. 0 not checked. [2018-12-03 19:36:59,099 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:37:01,340 INFO L134 CoverageAnalysis]: Checked inductivity of 19044 backedges. 8178 proven. 930 refuted. 0 times theorem prover too weak. 9936 trivial. 0 not checked. [2018-12-03 19:37:01,359 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:37:01,359 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 34, 34] total 167 [2018-12-03 19:37:01,359 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:37:01,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 135 states [2018-12-03 19:37:01,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 135 interpolants. [2018-12-03 19:37:01,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7397, Invalid=20325, Unknown=0, NotChecked=0, Total=27722 [2018-12-03 19:37:01,362 INFO L87 Difference]: Start difference. First operand 2559 states and 2659 transitions. Second operand 135 states. [2018-12-03 19:37:12,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:37:12,390 INFO L93 Difference]: Finished difference Result 5025 states and 5234 transitions. [2018-12-03 19:37:12,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 197 states. [2018-12-03 19:37:12,390 INFO L78 Accepts]: Start accepts. Automaton has 135 states. Word has length 278 [2018-12-03 19:37:12,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:37:12,392 INFO L225 Difference]: With dead ends: 5025 [2018-12-03 19:37:12,392 INFO L226 Difference]: Without dead ends: 2668 [2018-12-03 19:37:12,395 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 820 GetRequests, 492 SyntacticMatches, 0 SemanticMatches, 328 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21606 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=30371, Invalid=78199, Unknown=0, NotChecked=0, Total=108570 [2018-12-03 19:37:12,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2668 states. [2018-12-03 19:37:12,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2668 to 2637. [2018-12-03 19:37:12,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2637 states. [2018-12-03 19:37:12,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2637 states to 2637 states and 2739 transitions. [2018-12-03 19:37:12,442 INFO L78 Accepts]: Start accepts. Automaton has 2637 states and 2739 transitions. Word has length 278 [2018-12-03 19:37:12,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:37:12,443 INFO L480 AbstractCegarLoop]: Abstraction has 2637 states and 2739 transitions. [2018-12-03 19:37:12,443 INFO L481 AbstractCegarLoop]: Interpolant automaton has 135 states. [2018-12-03 19:37:12,443 INFO L276 IsEmpty]: Start isEmpty. Operand 2637 states and 2739 transitions. [2018-12-03 19:37:12,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 281 [2018-12-03 19:37:12,444 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:37:12,444 INFO L402 BasicCegarLoop]: trace histogram [138, 137, 2, 1, 1, 1] [2018-12-03 19:37:12,445 INFO L423 AbstractCegarLoop]: === Iteration 105 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:37:12,445 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:37:12,445 INFO L82 PathProgramCache]: Analyzing trace with hash 1215323922, now seen corresponding path program 102 times [2018-12-03 19:37:12,445 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:37:12,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:37:12,446 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:37:12,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:37:12,446 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:37:12,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:37:16,385 INFO L134 CoverageAnalysis]: Checked inductivity of 19321 backedges. 7714 proven. 10201 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:37:16,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:37:16,386 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:37:16,386 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:37:16,386 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:37:16,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:37:16,386 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:37:16,394 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:37:16,394 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:37:16,496 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:37:16,496 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:37:16,501 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:37:16,557 INFO L134 CoverageAnalysis]: Checked inductivity of 19321 backedges. 7714 proven. 10201 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:37:16,557 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:37:27,768 INFO L134 CoverageAnalysis]: Checked inductivity of 19321 backedges. 7714 proven. 10201 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:37:27,788 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:37:27,788 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 103, 103] total 205 [2018-12-03 19:37:27,788 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:37:27,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2018-12-03 19:37:27,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2018-12-03 19:37:27,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21115, Invalid=21115, Unknown=0, NotChecked=0, Total=42230 [2018-12-03 19:37:27,791 INFO L87 Difference]: Start difference. First operand 2637 states and 2739 transitions. Second operand 104 states. [2018-12-03 19:37:28,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:37:28,131 INFO L93 Difference]: Finished difference Result 5072 states and 5276 transitions. [2018-12-03 19:37:28,131 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2018-12-03 19:37:28,131 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 280 [2018-12-03 19:37:28,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:37:28,133 INFO L225 Difference]: With dead ends: 5072 [2018-12-03 19:37:28,133 INFO L226 Difference]: Without dead ends: 2639 [2018-12-03 19:37:28,136 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 661 GetRequests, 457 SyntacticMatches, 0 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=21115, Invalid=21115, Unknown=0, NotChecked=0, Total=42230 [2018-12-03 19:37:28,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2639 states. [2018-12-03 19:37:28,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2639 to 2639. [2018-12-03 19:37:28,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2639 states. [2018-12-03 19:37:28,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2639 states to 2639 states and 2741 transitions. [2018-12-03 19:37:28,184 INFO L78 Accepts]: Start accepts. Automaton has 2639 states and 2741 transitions. Word has length 280 [2018-12-03 19:37:28,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:37:28,184 INFO L480 AbstractCegarLoop]: Abstraction has 2639 states and 2741 transitions. [2018-12-03 19:37:28,184 INFO L481 AbstractCegarLoop]: Interpolant automaton has 104 states. [2018-12-03 19:37:28,184 INFO L276 IsEmpty]: Start isEmpty. Operand 2639 states and 2741 transitions. [2018-12-03 19:37:28,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 283 [2018-12-03 19:37:28,186 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:37:28,186 INFO L402 BasicCegarLoop]: trace histogram [139, 138, 2, 1, 1, 1] [2018-12-03 19:37:28,186 INFO L423 AbstractCegarLoop]: === Iteration 106 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:37:28,186 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:37:28,186 INFO L82 PathProgramCache]: Analyzing trace with hash 1555438348, now seen corresponding path program 103 times [2018-12-03 19:37:28,186 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:37:28,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:37:28,187 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:37:28,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:37:28,187 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:37:28,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:37:32,276 INFO L134 CoverageAnalysis]: Checked inductivity of 19600 backedges. 7790 proven. 10404 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:37:32,277 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:37:32,277 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:37:32,277 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:37:32,277 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:37:32,277 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:37:32,277 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 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:37:32,285 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:37:32,285 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:37:32,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:37:32,397 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:37:32,454 INFO L134 CoverageAnalysis]: Checked inductivity of 19600 backedges. 7790 proven. 10404 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:37:32,454 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:37:43,862 INFO L134 CoverageAnalysis]: Checked inductivity of 19600 backedges. 7790 proven. 10404 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:37:43,881 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:37:43,881 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 104, 104] total 207 [2018-12-03 19:37:43,881 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:37:43,881 INFO L459 AbstractCegarLoop]: Interpolant automaton has 105 states [2018-12-03 19:37:43,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2018-12-03 19:37:43,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21528, Invalid=21528, Unknown=0, NotChecked=0, Total=43056 [2018-12-03 19:37:43,883 INFO L87 Difference]: Start difference. First operand 2639 states and 2741 transitions. Second operand 105 states. [2018-12-03 19:37:44,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:37:44,225 INFO L93 Difference]: Finished difference Result 5074 states and 5278 transitions. [2018-12-03 19:37:44,225 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2018-12-03 19:37:44,225 INFO L78 Accepts]: Start accepts. Automaton has 105 states. Word has length 282 [2018-12-03 19:37:44,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:37:44,227 INFO L225 Difference]: With dead ends: 5074 [2018-12-03 19:37:44,227 INFO L226 Difference]: Without dead ends: 2641 [2018-12-03 19:37:44,230 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 666 GetRequests, 460 SyntacticMatches, 0 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.2s TimeCoverageRelationStatistics Valid=21528, Invalid=21528, Unknown=0, NotChecked=0, Total=43056 [2018-12-03 19:37:44,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2641 states. [2018-12-03 19:37:44,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2641 to 2641. [2018-12-03 19:37:44,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2641 states. [2018-12-03 19:37:44,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2641 states to 2641 states and 2743 transitions. [2018-12-03 19:37:44,284 INFO L78 Accepts]: Start accepts. Automaton has 2641 states and 2743 transitions. Word has length 282 [2018-12-03 19:37:44,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:37:44,284 INFO L480 AbstractCegarLoop]: Abstraction has 2641 states and 2743 transitions. [2018-12-03 19:37:44,284 INFO L481 AbstractCegarLoop]: Interpolant automaton has 105 states. [2018-12-03 19:37:44,284 INFO L276 IsEmpty]: Start isEmpty. Operand 2641 states and 2743 transitions. [2018-12-03 19:37:44,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-12-03 19:37:44,286 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:37:44,286 INFO L402 BasicCegarLoop]: trace histogram [140, 139, 2, 1, 1, 1] [2018-12-03 19:37:44,286 INFO L423 AbstractCegarLoop]: === Iteration 107 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:37:44,286 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:37:44,286 INFO L82 PathProgramCache]: Analyzing trace with hash 1987887238, now seen corresponding path program 104 times [2018-12-03 19:37:44,286 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:37:44,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:37:44,287 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:37:44,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:37:44,287 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:37:44,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:37:48,439 INFO L134 CoverageAnalysis]: Checked inductivity of 19881 backedges. 7866 proven. 10609 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:37:48,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:37:48,440 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:37:48,440 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:37:48,440 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:37:48,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:37:48,440 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 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:37:48,447 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:37:48,448 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:37:48,574 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 19:37:48,574 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:37:48,578 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:37:50,398 INFO L134 CoverageAnalysis]: Checked inductivity of 19881 backedges. 8358 proven. 992 refuted. 0 times theorem prover too weak. 10531 trivial. 0 not checked. [2018-12-03 19:37:50,398 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:37:52,783 INFO L134 CoverageAnalysis]: Checked inductivity of 19881 backedges. 8358 proven. 992 refuted. 0 times theorem prover too weak. 10531 trivial. 0 not checked. [2018-12-03 19:37:52,801 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:37:52,801 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 35, 35] total 172 [2018-12-03 19:37:52,801 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:37:52,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 139 states [2018-12-03 19:37:52,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2018-12-03 19:37:52,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7842, Invalid=21570, Unknown=0, NotChecked=0, Total=29412 [2018-12-03 19:37:52,803 INFO L87 Difference]: Start difference. First operand 2641 states and 2743 transitions. Second operand 139 states. [2018-12-03 19:38:04,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:38:04,763 INFO L93 Difference]: Finished difference Result 5184 states and 5396 transitions. [2018-12-03 19:38:04,763 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 203 states. [2018-12-03 19:38:04,763 INFO L78 Accepts]: Start accepts. Automaton has 139 states. Word has length 284 [2018-12-03 19:38:04,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:38:04,765 INFO L225 Difference]: With dead ends: 5184 [2018-12-03 19:38:04,765 INFO L226 Difference]: Without dead ends: 2751 [2018-12-03 19:38:04,770 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 840 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 338 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22901 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=32418, Invalid=82842, Unknown=0, NotChecked=0, Total=115260 [2018-12-03 19:38:04,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2751 states. [2018-12-03 19:38:04,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2751 to 2719. [2018-12-03 19:38:04,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2719 states. [2018-12-03 19:38:04,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2719 states to 2719 states and 2823 transitions. [2018-12-03 19:38:04,821 INFO L78 Accepts]: Start accepts. Automaton has 2719 states and 2823 transitions. Word has length 284 [2018-12-03 19:38:04,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:38:04,821 INFO L480 AbstractCegarLoop]: Abstraction has 2719 states and 2823 transitions. [2018-12-03 19:38:04,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has 139 states. [2018-12-03 19:38:04,822 INFO L276 IsEmpty]: Start isEmpty. Operand 2719 states and 2823 transitions. [2018-12-03 19:38:04,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2018-12-03 19:38:04,823 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:38:04,823 INFO L402 BasicCegarLoop]: trace histogram [141, 140, 2, 1, 1, 1] [2018-12-03 19:38:04,823 INFO L423 AbstractCegarLoop]: === Iteration 108 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:38:04,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:38:04,824 INFO L82 PathProgramCache]: Analyzing trace with hash 1610635264, now seen corresponding path program 105 times [2018-12-03 19:38:04,824 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:38:04,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:38:04,824 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:38:04,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:38:04,824 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:38:04,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:38:08,968 INFO L134 CoverageAnalysis]: Checked inductivity of 20164 backedges. 7942 proven. 10816 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:38:08,968 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:38:08,968 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:38:08,968 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:38:08,969 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:38:08,969 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:38:08,969 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:38:08,977 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:38:08,977 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:38:09,078 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:38:09,078 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:38:09,082 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:38:09,140 INFO L134 CoverageAnalysis]: Checked inductivity of 20164 backedges. 7942 proven. 10816 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:38:09,140 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:38:21,429 INFO L134 CoverageAnalysis]: Checked inductivity of 20164 backedges. 7942 proven. 10816 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:38:21,448 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:38:21,448 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106, 106] total 211 [2018-12-03 19:38:21,449 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:38:21,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-12-03 19:38:21,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-12-03 19:38:21,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22366, Invalid=22366, Unknown=0, NotChecked=0, Total=44732 [2018-12-03 19:38:21,452 INFO L87 Difference]: Start difference. First operand 2719 states and 2823 transitions. Second operand 107 states. [2018-12-03 19:38:21,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:38:21,830 INFO L93 Difference]: Finished difference Result 5230 states and 5438 transitions. [2018-12-03 19:38:21,831 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2018-12-03 19:38:21,831 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 286 [2018-12-03 19:38:21,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:38:21,833 INFO L225 Difference]: With dead ends: 5230 [2018-12-03 19:38:21,833 INFO L226 Difference]: Without dead ends: 2721 [2018-12-03 19:38:21,835 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 676 GetRequests, 466 SyntacticMatches, 0 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=22366, Invalid=22366, Unknown=0, NotChecked=0, Total=44732 [2018-12-03 19:38:21,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2721 states. [2018-12-03 19:38:21,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2721 to 2721. [2018-12-03 19:38:21,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2721 states. [2018-12-03 19:38:21,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2721 states to 2721 states and 2825 transitions. [2018-12-03 19:38:21,884 INFO L78 Accepts]: Start accepts. Automaton has 2721 states and 2825 transitions. Word has length 286 [2018-12-03 19:38:21,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:38:21,885 INFO L480 AbstractCegarLoop]: Abstraction has 2721 states and 2825 transitions. [2018-12-03 19:38:21,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-12-03 19:38:21,885 INFO L276 IsEmpty]: Start isEmpty. Operand 2721 states and 2825 transitions. [2018-12-03 19:38:21,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2018-12-03 19:38:21,886 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:38:21,886 INFO L402 BasicCegarLoop]: trace histogram [142, 141, 2, 1, 1, 1] [2018-12-03 19:38:21,887 INFO L423 AbstractCegarLoop]: === Iteration 109 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:38:21,887 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:38:21,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1118023802, now seen corresponding path program 106 times [2018-12-03 19:38:21,887 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:38:21,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:38:21,887 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:38:21,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:38:21,887 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:38:21,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:38:26,171 INFO L134 CoverageAnalysis]: Checked inductivity of 20449 backedges. 8018 proven. 11025 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:38:26,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:38:26,172 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:38:26,172 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:38:26,172 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:38:26,172 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:38:26,172 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:38:26,179 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:38:26,180 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:38:26,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:38:26,287 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:38:26,346 INFO L134 CoverageAnalysis]: Checked inductivity of 20449 backedges. 8018 proven. 11025 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:38:26,346 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:38:38,250 INFO L134 CoverageAnalysis]: Checked inductivity of 20449 backedges. 8018 proven. 11025 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:38:38,269 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:38:38,269 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [107, 107, 107] total 213 [2018-12-03 19:38:38,269 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:38:38,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 108 states [2018-12-03 19:38:38,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2018-12-03 19:38:38,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22791, Invalid=22791, Unknown=0, NotChecked=0, Total=45582 [2018-12-03 19:38:38,272 INFO L87 Difference]: Start difference. First operand 2721 states and 2825 transitions. Second operand 108 states. [2018-12-03 19:38:38,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:38:38,717 INFO L93 Difference]: Finished difference Result 5232 states and 5440 transitions. [2018-12-03 19:38:38,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2018-12-03 19:38:38,717 INFO L78 Accepts]: Start accepts. Automaton has 108 states. Word has length 288 [2018-12-03 19:38:38,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:38:38,719 INFO L225 Difference]: With dead ends: 5232 [2018-12-03 19:38:38,719 INFO L226 Difference]: Without dead ends: 2723 [2018-12-03 19:38:38,722 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 681 GetRequests, 469 SyntacticMatches, 0 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.9s TimeCoverageRelationStatistics Valid=22791, Invalid=22791, Unknown=0, NotChecked=0, Total=45582 [2018-12-03 19:38:38,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2723 states. [2018-12-03 19:38:38,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2723 to 2723. [2018-12-03 19:38:38,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2723 states. [2018-12-03 19:38:38,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2723 states to 2723 states and 2827 transitions. [2018-12-03 19:38:38,771 INFO L78 Accepts]: Start accepts. Automaton has 2723 states and 2827 transitions. Word has length 288 [2018-12-03 19:38:38,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:38:38,772 INFO L480 AbstractCegarLoop]: Abstraction has 2723 states and 2827 transitions. [2018-12-03 19:38:38,772 INFO L481 AbstractCegarLoop]: Interpolant automaton has 108 states. [2018-12-03 19:38:38,772 INFO L276 IsEmpty]: Start isEmpty. Operand 2723 states and 2827 transitions. [2018-12-03 19:38:38,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2018-12-03 19:38:38,774 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:38:38,774 INFO L402 BasicCegarLoop]: trace histogram [143, 142, 2, 1, 1, 1] [2018-12-03 19:38:38,774 INFO L423 AbstractCegarLoop]: === Iteration 110 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:38:38,774 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:38:38,775 INFO L82 PathProgramCache]: Analyzing trace with hash 164811380, now seen corresponding path program 107 times [2018-12-03 19:38:38,775 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:38:38,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:38:38,775 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:38:38,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:38:38,775 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:38:38,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:38:43,069 INFO L134 CoverageAnalysis]: Checked inductivity of 20736 backedges. 8094 proven. 11236 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:38:43,069 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:38:43,069 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:38:43,070 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:38:43,070 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:38:43,070 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:38:43,070 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 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:38:43,078 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:38:43,078 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:38:43,203 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 19:38:43,204 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:38:43,206 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:38:45,006 INFO L134 CoverageAnalysis]: Checked inductivity of 20736 backedges. 8534 proven. 1056 refuted. 0 times theorem prover too weak. 11146 trivial. 0 not checked. [2018-12-03 19:38:45,007 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:38:47,790 INFO L134 CoverageAnalysis]: Checked inductivity of 20736 backedges. 8534 proven. 1056 refuted. 0 times theorem prover too weak. 11146 trivial. 0 not checked. [2018-12-03 19:38:47,809 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:38:47,809 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [108, 36, 36] total 177 [2018-12-03 19:38:47,809 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:38:47,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 143 states [2018-12-03 19:38:47,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2018-12-03 19:38:47,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8300, Invalid=22852, Unknown=0, NotChecked=0, Total=31152 [2018-12-03 19:38:47,811 INFO L87 Difference]: Start difference. First operand 2723 states and 2827 transitions. Second operand 143 states. [2018-12-03 19:38:59,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:38:59,893 INFO L93 Difference]: Finished difference Result 5343 states and 5558 transitions. [2018-12-03 19:38:59,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 209 states. [2018-12-03 19:38:59,894 INFO L78 Accepts]: Start accepts. Automaton has 143 states. Word has length 290 [2018-12-03 19:38:59,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:38:59,896 INFO L225 Difference]: With dead ends: 5343 [2018-12-03 19:38:59,896 INFO L226 Difference]: Without dead ends: 2834 [2018-12-03 19:38:59,900 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 860 GetRequests, 512 SyntacticMatches, 0 SemanticMatches, 348 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24228 ImplicationChecksByTransitivity, 19.8s TimeCoverageRelationStatistics Valid=34532, Invalid=87618, Unknown=0, NotChecked=0, Total=122150 [2018-12-03 19:38:59,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2834 states. [2018-12-03 19:38:59,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2834 to 2801. [2018-12-03 19:38:59,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2801 states. [2018-12-03 19:38:59,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2801 states to 2801 states and 2907 transitions. [2018-12-03 19:38:59,951 INFO L78 Accepts]: Start accepts. Automaton has 2801 states and 2907 transitions. Word has length 290 [2018-12-03 19:38:59,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:38:59,951 INFO L480 AbstractCegarLoop]: Abstraction has 2801 states and 2907 transitions. [2018-12-03 19:38:59,951 INFO L481 AbstractCegarLoop]: Interpolant automaton has 143 states. [2018-12-03 19:38:59,951 INFO L276 IsEmpty]: Start isEmpty. Operand 2801 states and 2907 transitions. [2018-12-03 19:38:59,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2018-12-03 19:38:59,953 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:38:59,953 INFO L402 BasicCegarLoop]: trace histogram [144, 143, 2, 1, 1, 1] [2018-12-03 19:38:59,953 INFO L423 AbstractCegarLoop]: === Iteration 111 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:38:59,953 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:38:59,954 INFO L82 PathProgramCache]: Analyzing trace with hash -627972498, now seen corresponding path program 108 times [2018-12-03 19:38:59,954 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:38:59,954 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:38:59,954 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:38:59,954 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:38:59,955 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:39:00,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:39:04,399 INFO L134 CoverageAnalysis]: Checked inductivity of 21025 backedges. 8170 proven. 11449 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:39:04,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:39:04,400 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:39:04,400 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:39:04,400 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:39:04,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:39:04,400 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 109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:39:04,408 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:39:04,408 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:39:04,513 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:39:04,514 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:39:04,519 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:39:04,579 INFO L134 CoverageAnalysis]: Checked inductivity of 21025 backedges. 8170 proven. 11449 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:39:04,579 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:39:16,810 INFO L134 CoverageAnalysis]: Checked inductivity of 21025 backedges. 8170 proven. 11449 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:39:16,828 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:39:16,828 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [109, 109, 109] total 217 [2018-12-03 19:39:16,828 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:39:16,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2018-12-03 19:39:16,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2018-12-03 19:39:16,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23653, Invalid=23653, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 19:39:16,831 INFO L87 Difference]: Start difference. First operand 2801 states and 2907 transitions. Second operand 110 states. [2018-12-03 19:39:17,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:39:17,417 INFO L93 Difference]: Finished difference Result 5388 states and 5600 transitions. [2018-12-03 19:39:17,417 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2018-12-03 19:39:17,418 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 292 [2018-12-03 19:39:17,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:39:17,419 INFO L225 Difference]: With dead ends: 5388 [2018-12-03 19:39:17,420 INFO L226 Difference]: Without dead ends: 2803 [2018-12-03 19:39:17,421 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 691 GetRequests, 475 SyntacticMatches, 0 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=23653, Invalid=23653, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 19:39:17,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2803 states. [2018-12-03 19:39:17,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2803 to 2803. [2018-12-03 19:39:17,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2803 states. [2018-12-03 19:39:17,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2803 states to 2803 states and 2909 transitions. [2018-12-03 19:39:17,472 INFO L78 Accepts]: Start accepts. Automaton has 2803 states and 2909 transitions. Word has length 292 [2018-12-03 19:39:17,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:39:17,472 INFO L480 AbstractCegarLoop]: Abstraction has 2803 states and 2909 transitions. [2018-12-03 19:39:17,472 INFO L481 AbstractCegarLoop]: Interpolant automaton has 110 states. [2018-12-03 19:39:17,472 INFO L276 IsEmpty]: Start isEmpty. Operand 2803 states and 2909 transitions. [2018-12-03 19:39:17,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2018-12-03 19:39:17,474 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:39:17,474 INFO L402 BasicCegarLoop]: trace histogram [145, 144, 2, 1, 1, 1] [2018-12-03 19:39:17,474 INFO L423 AbstractCegarLoop]: === Iteration 112 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:39:17,474 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:39:17,474 INFO L82 PathProgramCache]: Analyzing trace with hash 1359706984, now seen corresponding path program 109 times [2018-12-03 19:39:17,474 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:39:17,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:39:17,475 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:39:17,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:39:17,475 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:39:17,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:39:21,749 INFO L134 CoverageAnalysis]: Checked inductivity of 21316 backedges. 8246 proven. 11664 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:39:21,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:39:21,749 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:39:21,749 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:39:21,749 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:39:21,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:39:21,750 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:39:21,758 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:39:21,759 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:39:21,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:39:21,872 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:39:21,933 INFO L134 CoverageAnalysis]: Checked inductivity of 21316 backedges. 8246 proven. 11664 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:39:21,934 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:39:34,218 INFO L134 CoverageAnalysis]: Checked inductivity of 21316 backedges. 8246 proven. 11664 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:39:34,237 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:39:34,238 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [110, 110, 110] total 219 [2018-12-03 19:39:34,238 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:39:34,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 111 states [2018-12-03 19:39:34,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2018-12-03 19:39:34,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24090, Invalid=24090, Unknown=0, NotChecked=0, Total=48180 [2018-12-03 19:39:34,240 INFO L87 Difference]: Start difference. First operand 2803 states and 2909 transitions. Second operand 111 states. [2018-12-03 19:39:34,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:39:34,690 INFO L93 Difference]: Finished difference Result 5390 states and 5602 transitions. [2018-12-03 19:39:34,691 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-12-03 19:39:34,691 INFO L78 Accepts]: Start accepts. Automaton has 111 states. Word has length 294 [2018-12-03 19:39:34,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:39:34,693 INFO L225 Difference]: With dead ends: 5390 [2018-12-03 19:39:34,693 INFO L226 Difference]: Without dead ends: 2805 [2018-12-03 19:39:34,695 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 696 GetRequests, 478 SyntacticMatches, 0 SemanticMatches, 218 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=24090, Invalid=24090, Unknown=0, NotChecked=0, Total=48180 [2018-12-03 19:39:34,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2805 states. [2018-12-03 19:39:34,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2805 to 2805. [2018-12-03 19:39:34,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2805 states. [2018-12-03 19:39:34,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2805 states to 2805 states and 2911 transitions. [2018-12-03 19:39:34,746 INFO L78 Accepts]: Start accepts. Automaton has 2805 states and 2911 transitions. Word has length 294 [2018-12-03 19:39:34,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:39:34,746 INFO L480 AbstractCegarLoop]: Abstraction has 2805 states and 2911 transitions. [2018-12-03 19:39:34,746 INFO L481 AbstractCegarLoop]: Interpolant automaton has 111 states. [2018-12-03 19:39:34,746 INFO L276 IsEmpty]: Start isEmpty. Operand 2805 states and 2911 transitions. [2018-12-03 19:39:34,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2018-12-03 19:39:34,748 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:39:34,748 INFO L402 BasicCegarLoop]: trace histogram [146, 145, 2, 1, 1, 1] [2018-12-03 19:39:34,748 INFO L423 AbstractCegarLoop]: === Iteration 113 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:39:34,748 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:39:34,749 INFO L82 PathProgramCache]: Analyzing trace with hash 259242466, now seen corresponding path program 110 times [2018-12-03 19:39:34,749 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:39:34,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:39:34,749 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:39:34,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:39:34,750 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:39:34,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:39:39,149 INFO L134 CoverageAnalysis]: Checked inductivity of 21609 backedges. 8322 proven. 11881 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2018-12-03 19:39:39,150 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:39:39,150 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:39:39,150 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:39:39,150 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:39:39,150 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:39:39,150 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 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:39:39,166 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:39:39,166 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:39:39,294 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 19:39:39,294 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:39:39,297 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:39:41,160 INFO L134 CoverageAnalysis]: Checked inductivity of 21609 backedges. 8706 proven. 1122 refuted. 0 times theorem prover too weak. 11781 trivial. 0 not checked. [2018-12-03 19:39:41,161 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:39:43,916 INFO L134 CoverageAnalysis]: Checked inductivity of 21609 backedges. 8706 proven. 1122 refuted. 0 times theorem prover too weak. 11781 trivial. 0 not checked. [2018-12-03 19:39:43,934 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:39:43,935 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [111, 37, 37] total 182 [2018-12-03 19:39:43,935 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:39:43,935 INFO L459 AbstractCegarLoop]: Interpolant automaton has 147 states [2018-12-03 19:39:43,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2018-12-03 19:39:43,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8771, Invalid=24171, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 19:39:43,937 INFO L87 Difference]: Start difference. First operand 2805 states and 2911 transitions. Second operand 147 states.